projects / linux-block.git / blame_incremental
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (non-incremental) | history | HEAD
KVM: fix the race while wakeup all pv guest
[linux-block.git] / arch / x86 / kvm / vmx.c
... / ...
CommitLineData
1/*
2 * Kernel-based Virtual Machine driver for Linux
3 *
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
6 *
7 * Copyright (C) 2006 Qumranet, Inc.
8 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
9 *
10 * Authors:
11 * Avi Kivity <avi@qumranet.com>
12 * Yaniv Kamay <yaniv@qumranet.com>
13 *
14 * This work is licensed under the terms of the GNU GPL, version 2. See
15 * the COPYING file in the top-level directory.
16 *
17 */
18
19#include "irq.h"
20#include "mmu.h"
21
22#include <linux/kvm_host.h>
23#include <linux/module.h>
24#include <linux/kernel.h>
25#include <linux/mm.h>
26#include <linux/highmem.h>
27#include <linux/sched.h>
28#include <linux/moduleparam.h>
29#include <linux/ftrace_event.h>
30#include <linux/slab.h>
31#include <linux/tboot.h>
32#include "kvm_cache_regs.h"
33#include "x86.h"
34
35#include <asm/io.h>
36#include <asm/desc.h>
37#include <asm/vmx.h>
38#include <asm/virtext.h>
39#include <asm/mce.h>
40#include <asm/i387.h>
41#include <asm/xcr.h>
42
43#include "trace.h"
44
45#define __ex(x) __kvm_handle_fault_on_reboot(x)
46
47MODULE_AUTHOR("Qumranet");
48MODULE_LICENSE("GPL");
49
50static int __read_mostly bypass_guest_pf = 1;
51module_param(bypass_guest_pf, bool, S_IRUGO);
52
53static int __read_mostly enable_vpid = 1;
54module_param_named(vpid, enable_vpid, bool, 0444);
55
56static int __read_mostly flexpriority_enabled = 1;
57module_param_named(flexpriority, flexpriority_enabled, bool, S_IRUGO);
58
59static int __read_mostly enable_ept = 1;
60module_param_named(ept, enable_ept, bool, S_IRUGO);
61
62static int __read_mostly enable_unrestricted_guest = 1;
63module_param_named(unrestricted_guest,
64 enable_unrestricted_guest, bool, S_IRUGO);
65
66static int __read_mostly emulate_invalid_guest_state = 0;
67module_param(emulate_invalid_guest_state, bool, S_IRUGO);
68
69static int __read_mostly vmm_exclusive = 1;
70module_param(vmm_exclusive, bool, S_IRUGO);
71
72#define KVM_GUEST_CR0_MASK_UNRESTRICTED_GUEST \
73 (X86_CR0_WP | X86_CR0_NE | X86_CR0_NW | X86_CR0_CD)
74#define KVM_GUEST_CR0_MASK \
75 (KVM_GUEST_CR0_MASK_UNRESTRICTED_GUEST | X86_CR0_PG | X86_CR0_PE)
76#define KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST \
77 (X86_CR0_WP | X86_CR0_NE)
78#define KVM_VM_CR0_ALWAYS_ON \
79 (KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST | X86_CR0_PG | X86_CR0_PE)
80#define KVM_CR4_GUEST_OWNED_BITS \
81 (X86_CR4_PVI | X86_CR4_DE | X86_CR4_PCE | X86_CR4_OSFXSR \
82 | X86_CR4_OSXMMEXCPT)
83
84#define KVM_PMODE_VM_CR4_ALWAYS_ON (X86_CR4_PAE | X86_CR4_VMXE)
85#define KVM_RMODE_VM_CR4_ALWAYS_ON (X86_CR4_VME | X86_CR4_PAE | X86_CR4_VMXE)
86
87#define RMODE_GUEST_OWNED_EFLAGS_BITS (~(X86_EFLAGS_IOPL | X86_EFLAGS_VM))
88
89/*
90 * These 2 parameters are used to config the controls for Pause-Loop Exiting:
91 * ple_gap: upper bound on the amount of time between two successive
92 * executions of PAUSE in a loop. Also indicate if ple enabled.
93 * According to test, this time is usually small than 41 cycles.
94 * ple_window: upper bound on the amount of time a guest is allowed to execute
95 * in a PAUSE loop. Tests indicate that most spinlocks are held for
96 * less than 2^12 cycles
97 * Time is measured based on a counter that runs at the same rate as the TSC,
98 * refer SDM volume 3b section 21.6.13 & 22.1.3.
99 */
100#define KVM_VMX_DEFAULT_PLE_GAP 41
101#define KVM_VMX_DEFAULT_PLE_WINDOW 4096
102static int ple_gap = KVM_VMX_DEFAULT_PLE_GAP;
103module_param(ple_gap, int, S_IRUGO);
104
105static int ple_window = KVM_VMX_DEFAULT_PLE_WINDOW;
106module_param(ple_window, int, S_IRUGO);
107
108#define NR_AUTOLOAD_MSRS 1
109
110struct vmcs {
111 u32 revision_id;
112 u32 abort;
113 char data[0];
114};
115
116struct shared_msr_entry {
117 unsigned index;
118 u64 data;
119 u64 mask;
120};
121
122struct vcpu_vmx {
123 struct kvm_vcpu vcpu;
124 struct list_head local_vcpus_link;
125 unsigned long host_rsp;
126 int launched;
127 u8 fail;
128 u32 exit_intr_info;
129 u32 idt_vectoring_info;
130 struct shared_msr_entry *guest_msrs;
131 int nmsrs;
132 int save_nmsrs;
133#ifdef CONFIG_X86_64
134 u64 msr_host_kernel_gs_base;
135 u64 msr_guest_kernel_gs_base;
136#endif
137 struct vmcs *vmcs;
138 struct msr_autoload {
139 unsigned nr;
140 struct vmx_msr_entry guest[NR_AUTOLOAD_MSRS];
141 struct vmx_msr_entry host[NR_AUTOLOAD_MSRS];
142 } msr_autoload;
143 struct {
144 int loaded;
145 u16 fs_sel, gs_sel, ldt_sel;
146 int gs_ldt_reload_needed;
147 int fs_reload_needed;
148 } host_state;
149 struct {
150 int vm86_active;
151 ulong save_rflags;
152 struct kvm_save_segment {
153 u16 selector;
154 unsigned long base;
155 u32 limit;
156 u32 ar;
157 } tr, es, ds, fs, gs;
158 } rmode;
159 int vpid;
160 bool emulation_required;
161
162 /* Support for vnmi-less CPUs */
163 int soft_vnmi_blocked;
164 ktime_t entry_time;
165 s64 vnmi_blocked_time;
166 u32 exit_reason;
167
168 bool rdtscp_enabled;
169};
170
171static inline struct vcpu_vmx *to_vmx(struct kvm_vcpu *vcpu)
172{
173 return container_of(vcpu, struct vcpu_vmx, vcpu);
174}
175
176static int init_rmode(struct kvm *kvm);
177static u64 construct_eptp(unsigned long root_hpa);
178static void kvm_cpu_vmxon(u64 addr);
179static void kvm_cpu_vmxoff(void);
180
181static DEFINE_PER_CPU(struct vmcs *, vmxarea);
182static DEFINE_PER_CPU(struct vmcs *, current_vmcs);
183static DEFINE_PER_CPU(struct list_head, vcpus_on_cpu);
184static DEFINE_PER_CPU(struct desc_ptr, host_gdt);
185
186static unsigned long *vmx_io_bitmap_a;
187static unsigned long *vmx_io_bitmap_b;
188static unsigned long *vmx_msr_bitmap_legacy;
189static unsigned long *vmx_msr_bitmap_longmode;
190
191static DECLARE_BITMAP(vmx_vpid_bitmap, VMX_NR_VPIDS);
192static DEFINE_SPINLOCK(vmx_vpid_lock);
193
194static struct vmcs_config {
195 int size;
196 int order;
197 u32 revision_id;
198 u32 pin_based_exec_ctrl;
199 u32 cpu_based_exec_ctrl;
200 u32 cpu_based_2nd_exec_ctrl;
201 u32 vmexit_ctrl;
202 u32 vmentry_ctrl;
203} vmcs_config;
204
205static struct vmx_capability {
206 u32 ept;
207 u32 vpid;
208} vmx_capability;
209
210#define VMX_SEGMENT_FIELD(seg) \
211 [VCPU_SREG_##seg] = { \
212 .selector = GUEST_##seg##_SELECTOR, \
213 .base = GUEST_##seg##_BASE, \
214 .limit = GUEST_##seg##_LIMIT, \
215 .ar_bytes = GUEST_##seg##_AR_BYTES, \
216 }
217
218static struct kvm_vmx_segment_field {
219 unsigned selector;
220 unsigned base;
221 unsigned limit;
222 unsigned ar_bytes;
223} kvm_vmx_segment_fields[] = {
224 VMX_SEGMENT_FIELD(CS),
225 VMX_SEGMENT_FIELD(DS),
226 VMX_SEGMENT_FIELD(ES),
227 VMX_SEGMENT_FIELD(FS),
228 VMX_SEGMENT_FIELD(GS),
229 VMX_SEGMENT_FIELD(SS),
230 VMX_SEGMENT_FIELD(TR),
231 VMX_SEGMENT_FIELD(LDTR),
232};
233
234static u64 host_efer;
235
236static void ept_save_pdptrs(struct kvm_vcpu *vcpu);
237
238/*
239 * Keep MSR_STAR at the end, as setup_msrs() will try to optimize it
240 * away by decrementing the array size.
241 */
242static const u32 vmx_msr_index[] = {
243#ifdef CONFIG_X86_64
244 MSR_SYSCALL_MASK, MSR_LSTAR, MSR_CSTAR,
245#endif
246 MSR_EFER, MSR_TSC_AUX, MSR_STAR,
247};
248#define NR_VMX_MSR ARRAY_SIZE(vmx_msr_index)
249
250static inline bool is_page_fault(u32 intr_info)
251{
252 return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
253 INTR_INFO_VALID_MASK)) ==
254 (INTR_TYPE_HARD_EXCEPTION | PF_VECTOR | INTR_INFO_VALID_MASK);
255}
256
257static inline bool is_no_device(u32 intr_info)
258{
259 return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
260 INTR_INFO_VALID_MASK)) ==
261 (INTR_TYPE_HARD_EXCEPTION | NM_VECTOR | INTR_INFO_VALID_MASK);
262}
263
264static inline bool is_invalid_opcode(u32 intr_info)
265{
266 return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
267 INTR_INFO_VALID_MASK)) ==
268 (INTR_TYPE_HARD_EXCEPTION | UD_VECTOR | INTR_INFO_VALID_MASK);
269}
270
271static inline bool is_external_interrupt(u32 intr_info)
272{
273 return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK))
274 == (INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK);
275}
276
277static inline bool is_machine_check(u32 intr_info)
278{
279 return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
280 INTR_INFO_VALID_MASK)) ==
281 (INTR_TYPE_HARD_EXCEPTION | MC_VECTOR | INTR_INFO_VALID_MASK);
282}
283
284static inline bool cpu_has_vmx_msr_bitmap(void)
285{
286 return vmcs_config.cpu_based_exec_ctrl & CPU_BASED_USE_MSR_BITMAPS;
287}
288
289static inline bool cpu_has_vmx_tpr_shadow(void)
290{
291 return vmcs_config.cpu_based_exec_ctrl & CPU_BASED_TPR_SHADOW;
292}
293
294static inline bool vm_need_tpr_shadow(struct kvm *kvm)
295{
296 return (cpu_has_vmx_tpr_shadow()) && (irqchip_in_kernel(kvm));
297}
298
299static inline bool cpu_has_secondary_exec_ctrls(void)
300{
301 return vmcs_config.cpu_based_exec_ctrl &
302 CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
303}
304
305static inline bool cpu_has_vmx_virtualize_apic_accesses(void)
306{
307 return vmcs_config.cpu_based_2nd_exec_ctrl &
308 SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
309}
310
311static inline bool cpu_has_vmx_flexpriority(void)
312{
313 return cpu_has_vmx_tpr_shadow() &&
314 cpu_has_vmx_virtualize_apic_accesses();
315}
316
317static inline bool cpu_has_vmx_ept_execute_only(void)
318{
319 return vmx_capability.ept & VMX_EPT_EXECUTE_ONLY_BIT;
320}
321
322static inline bool cpu_has_vmx_eptp_uncacheable(void)
323{
324 return vmx_capability.ept & VMX_EPTP_UC_BIT;
325}
326
327static inline bool cpu_has_vmx_eptp_writeback(void)
328{
329 return vmx_capability.ept & VMX_EPTP_WB_BIT;
330}
331
332static inline bool cpu_has_vmx_ept_2m_page(void)
333{
334 return vmx_capability.ept & VMX_EPT_2MB_PAGE_BIT;
335}
336
337static inline bool cpu_has_vmx_ept_1g_page(void)
338{
339 return vmx_capability.ept & VMX_EPT_1GB_PAGE_BIT;
340}
341
342static inline bool cpu_has_vmx_ept_4levels(void)
343{
344 return vmx_capability.ept & VMX_EPT_PAGE_WALK_4_BIT;
345}
346
347static inline bool cpu_has_vmx_invept_individual_addr(void)
348{
349 return vmx_capability.ept & VMX_EPT_EXTENT_INDIVIDUAL_BIT;
350}
351
352static inline bool cpu_has_vmx_invept_context(void)
353{
354 return vmx_capability.ept & VMX_EPT_EXTENT_CONTEXT_BIT;
355}
356
357static inline bool cpu_has_vmx_invept_global(void)
358{
359 return vmx_capability.ept & VMX_EPT_EXTENT_GLOBAL_BIT;
360}
361
362static inline bool cpu_has_vmx_invvpid_single(void)
363{
364 return vmx_capability.vpid & VMX_VPID_EXTENT_SINGLE_CONTEXT_BIT;
365}
366
367static inline bool cpu_has_vmx_invvpid_global(void)
368{
369 return vmx_capability.vpid & VMX_VPID_EXTENT_GLOBAL_CONTEXT_BIT;
370}
371
372static inline bool cpu_has_vmx_ept(void)
373{
374 return vmcs_config.cpu_based_2nd_exec_ctrl &
375 SECONDARY_EXEC_ENABLE_EPT;
376}
377
378static inline bool cpu_has_vmx_unrestricted_guest(void)
379{
380 return vmcs_config.cpu_based_2nd_exec_ctrl &
381 SECONDARY_EXEC_UNRESTRICTED_GUEST;
382}
383
384static inline bool cpu_has_vmx_ple(void)
385{
386 return vmcs_config.cpu_based_2nd_exec_ctrl &
387 SECONDARY_EXEC_PAUSE_LOOP_EXITING;
388}
389
390static inline bool vm_need_virtualize_apic_accesses(struct kvm *kvm)
391{
392 return flexpriority_enabled && irqchip_in_kernel(kvm);
393}
394
395static inline bool cpu_has_vmx_vpid(void)
396{
397 return vmcs_config.cpu_based_2nd_exec_ctrl &
398 SECONDARY_EXEC_ENABLE_VPID;
399}
400
401static inline bool cpu_has_vmx_rdtscp(void)
402{
403 return vmcs_config.cpu_based_2nd_exec_ctrl &
404 SECONDARY_EXEC_RDTSCP;
405}
406
407static inline bool cpu_has_virtual_nmis(void)
408{
409 return vmcs_config.pin_based_exec_ctrl & PIN_BASED_VIRTUAL_NMIS;
410}
411
412static inline bool cpu_has_vmx_wbinvd_exit(void)
413{
414 return vmcs_config.cpu_based_2nd_exec_ctrl &
415 SECONDARY_EXEC_WBINVD_EXITING;
416}
417
418static inline bool report_flexpriority(void)
419{
420 return flexpriority_enabled;
421}
422
423static int __find_msr_index(struct vcpu_vmx *vmx, u32 msr)
424{
425 int i;
426
427 for (i = 0; i < vmx->nmsrs; ++i)
428 if (vmx_msr_index[vmx->guest_msrs[i].index] == msr)
429 return i;
430 return -1;
431}
432
433static inline void __invvpid(int ext, u16 vpid, gva_t gva)
434{
435 struct {
436 u64 vpid : 16;
437 u64 rsvd : 48;
438 u64 gva;
439 } operand = { vpid, 0, gva };
440
441 asm volatile (__ex(ASM_VMX_INVVPID)
442 /* CF==1 or ZF==1 --> rc = -1 */
443 "; ja 1f ; ud2 ; 1:"
444 : : "a"(&operand), "c"(ext) : "cc", "memory");
445}
446
447static inline void __invept(int ext, u64 eptp, gpa_t gpa)
448{
449 struct {
450 u64 eptp, gpa;
451 } operand = {eptp, gpa};
452
453 asm volatile (__ex(ASM_VMX_INVEPT)
454 /* CF==1 or ZF==1 --> rc = -1 */
455 "; ja 1f ; ud2 ; 1:\n"
456 : : "a" (&operand), "c" (ext) : "cc", "memory");
457}
458
459static struct shared_msr_entry *find_msr_entry(struct vcpu_vmx *vmx, u32 msr)
460{
461 int i;
462
463 i = __find_msr_index(vmx, msr);
464 if (i >= 0)
465 return &vmx->guest_msrs[i];
466 return NULL;
467}
468
469static void vmcs_clear(struct vmcs *vmcs)
470{
471 u64 phys_addr = __pa(vmcs);
472 u8 error;
473
474 asm volatile (__ex(ASM_VMX_VMCLEAR_RAX) "; setna %0"
475 : "=g"(error) : "a"(&phys_addr), "m"(phys_addr)
476 : "cc", "memory");
477 if (error)
478 printk(KERN_ERR "kvm: vmclear fail: %p/%llx\n",
479 vmcs, phys_addr);
480}
481
482static void vmcs_load(struct vmcs *vmcs)
483{
484 u64 phys_addr = __pa(vmcs);
485 u8 error;
486
487 asm volatile (__ex(ASM_VMX_VMPTRLD_RAX) "; setna %0"
488 : "=g"(error) : "a"(&phys_addr), "m"(phys_addr)
489 : "cc", "memory");
490 if (error)
491 printk(KERN_ERR "kvm: vmptrld %p/%llx fail\n",
492 vmcs, phys_addr);
493}
494
495static void __vcpu_clear(void *arg)
496{
497 struct vcpu_vmx *vmx = arg;
498 int cpu = raw_smp_processor_id();
499
500 if (vmx->vcpu.cpu == cpu)
501 vmcs_clear(vmx->vmcs);
502 if (per_cpu(current_vmcs, cpu) == vmx->vmcs)
503 per_cpu(current_vmcs, cpu) = NULL;
504 list_del(&vmx->local_vcpus_link);
505 vmx->vcpu.cpu = -1;
506 vmx->launched = 0;
507}
508
509static void vcpu_clear(struct vcpu_vmx *vmx)
510{
511 if (vmx->vcpu.cpu == -1)
512 return;
513 smp_call_function_single(vmx->vcpu.cpu, __vcpu_clear, vmx, 1);
514}
515
516static inline void vpid_sync_vcpu_single(struct vcpu_vmx *vmx)
517{
518 if (vmx->vpid == 0)
519 return;
520
521 if (cpu_has_vmx_invvpid_single())
522 __invvpid(VMX_VPID_EXTENT_SINGLE_CONTEXT, vmx->vpid, 0);
523}
524
525static inline void vpid_sync_vcpu_global(void)
526{
527 if (cpu_has_vmx_invvpid_global())
528 __invvpid(VMX_VPID_EXTENT_ALL_CONTEXT, 0, 0);
529}
530
531static inline void vpid_sync_context(struct vcpu_vmx *vmx)
532{
533 if (cpu_has_vmx_invvpid_single())
534 vpid_sync_vcpu_single(vmx);
535 else
536 vpid_sync_vcpu_global();
537}
538
539static inline void ept_sync_global(void)
540{
541 if (cpu_has_vmx_invept_global())
542 __invept(VMX_EPT_EXTENT_GLOBAL, 0, 0);
543}
544
545static inline void ept_sync_context(u64 eptp)
546{
547 if (enable_ept) {
548 if (cpu_has_vmx_invept_context())
549 __invept(VMX_EPT_EXTENT_CONTEXT, eptp, 0);
550 else
551 ept_sync_global();
552 }
553}
554
555static inline void ept_sync_individual_addr(u64 eptp, gpa_t gpa)
556{
557 if (enable_ept) {
558 if (cpu_has_vmx_invept_individual_addr())
559 __invept(VMX_EPT_EXTENT_INDIVIDUAL_ADDR,
560 eptp, gpa);
561 else
562 ept_sync_context(eptp);
563 }
564}
565
566static unsigned long vmcs_readl(unsigned long field)
567{
568 unsigned long value;
569
570 asm volatile (__ex(ASM_VMX_VMREAD_RDX_RAX)
571 : "=a"(value) : "d"(field) : "cc");
572 return value;
573}
574
575static u16 vmcs_read16(unsigned long field)
576{
577 return vmcs_readl(field);
578}
579
580static u32 vmcs_read32(unsigned long field)
581{
582 return vmcs_readl(field);
583}
584
585static u64 vmcs_read64(unsigned long field)
586{
587#ifdef CONFIG_X86_64
588 return vmcs_readl(field);
589#else
590 return vmcs_readl(field) | ((u64)vmcs_readl(field+1) << 32);
591#endif
592}
593
594static noinline void vmwrite_error(unsigned long field, unsigned long value)
595{
596 printk(KERN_ERR "vmwrite error: reg %lx value %lx (err %d)\n",
597 field, value, vmcs_read32(VM_INSTRUCTION_ERROR));
598 dump_stack();
599}
600
601static void vmcs_writel(unsigned long field, unsigned long value)
602{
603 u8 error;
604
605 asm volatile (__ex(ASM_VMX_VMWRITE_RAX_RDX) "; setna %0"
606 : "=q"(error) : "a"(value), "d"(field) : "cc");
607 if (unlikely(error))
608 vmwrite_error(field, value);
609}
610
611static void vmcs_write16(unsigned long field, u16 value)
612{
613 vmcs_writel(field, value);
614}
615
616static void vmcs_write32(unsigned long field, u32 value)
617{
618 vmcs_writel(field, value);
619}
620
621static void vmcs_write64(unsigned long field, u64 value)
622{
623 vmcs_writel(field, value);
624#ifndef CONFIG_X86_64
625 asm volatile ("");
626 vmcs_writel(field+1, value >> 32);
627#endif
628}
629
630static void vmcs_clear_bits(unsigned long field, u32 mask)
631{
632 vmcs_writel(field, vmcs_readl(field) & ~mask);
633}
634
635static void vmcs_set_bits(unsigned long field, u32 mask)
636{
637 vmcs_writel(field, vmcs_readl(field) | mask);
638}
639
640static void update_exception_bitmap(struct kvm_vcpu *vcpu)
641{
642 u32 eb;
643
644 eb = (1u << PF_VECTOR) | (1u << UD_VECTOR) | (1u << MC_VECTOR) |
645 (1u << NM_VECTOR) | (1u << DB_VECTOR);
646 if ((vcpu->guest_debug &
647 (KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP)) ==
648 (KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP))
649 eb |= 1u << BP_VECTOR;
650 if (to_vmx(vcpu)->rmode.vm86_active)
651 eb = ~0;
652 if (enable_ept)
653 eb &= ~(1u << PF_VECTOR); /* bypass_guest_pf = 0 */
654 if (vcpu->fpu_active)
655 eb &= ~(1u << NM_VECTOR);
656 vmcs_write32(EXCEPTION_BITMAP, eb);
657}
658
659static void clear_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr)
660{
661 unsigned i;
662 struct msr_autoload *m = &vmx->msr_autoload;
663
664 for (i = 0; i < m->nr; ++i)
665 if (m->guest[i].index == msr)
666 break;
667
668 if (i == m->nr)
669 return;
670 --m->nr;
671 m->guest[i] = m->guest[m->nr];
672 m->host[i] = m->host[m->nr];
673 vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, m->nr);
674 vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, m->nr);
675}
676
677static void add_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr,
678 u64 guest_val, u64 host_val)
679{
680 unsigned i;
681 struct msr_autoload *m = &vmx->msr_autoload;
682
683 for (i = 0; i < m->nr; ++i)
684 if (m->guest[i].index == msr)
685 break;
686
687 if (i == m->nr) {
688 ++m->nr;
689 vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, m->nr);
690 vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, m->nr);
691 }
692
693 m->guest[i].index = msr;
694 m->guest[i].value = guest_val;
695 m->host[i].index = msr;
696 m->host[i].value = host_val;
697}
698
699static void reload_tss(void)
700{
701 /*
702 * VT restores TR but not its size. Useless.
703 */
704 struct desc_ptr *gdt = &__get_cpu_var(host_gdt);
705 struct desc_struct *descs;
706
707 descs = (void *)gdt->address;
708 descs[GDT_ENTRY_TSS].type = 9; /* available TSS */
709 load_TR_desc();
710}
711
712static bool update_transition_efer(struct vcpu_vmx *vmx, int efer_offset)
713{
714 u64 guest_efer;
715 u64 ignore_bits;
716
717 guest_efer = vmx->vcpu.arch.efer;
718
719 /*
720 * NX is emulated; LMA and LME handled by hardware; SCE meaninless
721 * outside long mode
722 */
723 ignore_bits = EFER_NX | EFER_SCE;
724#ifdef CONFIG_X86_64
725 ignore_bits |= EFER_LMA | EFER_LME;
726 /* SCE is meaningful only in long mode on Intel */
727 if (guest_efer & EFER_LMA)
728 ignore_bits &= ~(u64)EFER_SCE;
729#endif
730 guest_efer &= ~ignore_bits;
731 guest_efer |= host_efer & ignore_bits;
732 vmx->guest_msrs[efer_offset].data = guest_efer;
733 vmx->guest_msrs[efer_offset].mask = ~ignore_bits;
734
735 clear_atomic_switch_msr(vmx, MSR_EFER);
736 /* On ept, can't emulate nx, and must switch nx atomically */
737 if (enable_ept && ((vmx->vcpu.arch.efer ^ host_efer) & EFER_NX)) {
738 guest_efer = vmx->vcpu.arch.efer;
739 if (!(guest_efer & EFER_LMA))
740 guest_efer &= ~EFER_LME;
741 add_atomic_switch_msr(vmx, MSR_EFER, guest_efer, host_efer);
742 return false;
743 }
744
745 return true;
746}
747
748static unsigned long segment_base(u16 selector)
749{
750 struct desc_ptr *gdt = &__get_cpu_var(host_gdt);
751 struct desc_struct *d;
752 unsigned long table_base;
753 unsigned long v;
754
755 if (!(selector & ~3))
756 return 0;
757
758 table_base = gdt->address;
759
760 if (selector & 4) { /* from ldt */
761 u16 ldt_selector = kvm_read_ldt();
762
763 if (!(ldt_selector & ~3))
764 return 0;
765
766 table_base = segment_base(ldt_selector);
767 }
768 d = (struct desc_struct *)(table_base + (selector & ~7));
769 v = get_desc_base(d);
770#ifdef CONFIG_X86_64
771 if (d->s == 0 && (d->type == 2 || d->type == 9 || d->type == 11))
772 v |= ((unsigned long)((struct ldttss_desc64 *)d)->base3) << 32;
773#endif
774 return v;
775}
776
777static inline unsigned long kvm_read_tr_base(void)
778{
779 u16 tr;
780 asm("str %0" : "=g"(tr));
781 return segment_base(tr);
782}
783
784static void vmx_save_host_state(struct kvm_vcpu *vcpu)
785{
786 struct vcpu_vmx *vmx = to_vmx(vcpu);
787 int i;
788
789 if (vmx->host_state.loaded)
790 return;
791
792 vmx->host_state.loaded = 1;
793 /*
794 * Set host fs and gs selectors. Unfortunately, 22.2.3 does not
795 * allow segment selectors with cpl > 0 or ti == 1.
796 */
797 vmx->host_state.ldt_sel = kvm_read_ldt();
798 vmx->host_state.gs_ldt_reload_needed = vmx->host_state.ldt_sel;
799 savesegment(fs, vmx->host_state.fs_sel);
800 if (!(vmx->host_state.fs_sel & 7)) {
801 vmcs_write16(HOST_FS_SELECTOR, vmx->host_state.fs_sel);
802 vmx->host_state.fs_reload_needed = 0;
803 } else {
804 vmcs_write16(HOST_FS_SELECTOR, 0);
805 vmx->host_state.fs_reload_needed = 1;
806 }
807 savesegment(gs, vmx->host_state.gs_sel);
808 if (!(vmx->host_state.gs_sel & 7))
809 vmcs_write16(HOST_GS_SELECTOR, vmx->host_state.gs_sel);
810 else {
811 vmcs_write16(HOST_GS_SELECTOR, 0);
812 vmx->host_state.gs_ldt_reload_needed = 1;
813 }
814
815#ifdef CONFIG_X86_64
816 vmcs_writel(HOST_FS_BASE, read_msr(MSR_FS_BASE));
817 vmcs_writel(HOST_GS_BASE, read_msr(MSR_GS_BASE));
818#else
819 vmcs_writel(HOST_FS_BASE, segment_base(vmx->host_state.fs_sel));
820 vmcs_writel(HOST_GS_BASE, segment_base(vmx->host_state.gs_sel));
821#endif
822
823#ifdef CONFIG_X86_64
824 rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base);
825 if (is_long_mode(&vmx->vcpu))
826 wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base);
827#endif
828 for (i = 0; i < vmx->save_nmsrs; ++i)
829 kvm_set_shared_msr(vmx->guest_msrs[i].index,
830 vmx->guest_msrs[i].data,
831 vmx->guest_msrs[i].mask);
832}
833
834static void __vmx_load_host_state(struct vcpu_vmx *vmx)
835{
836 if (!vmx->host_state.loaded)
837 return;
838
839 ++vmx->vcpu.stat.host_state_reload;
840 vmx->host_state.loaded = 0;
841#ifdef CONFIG_X86_64
842 if (is_long_mode(&vmx->vcpu))
843 rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base);
844#endif
845 if (vmx->host_state.gs_ldt_reload_needed) {
846 kvm_load_ldt(vmx->host_state.ldt_sel);
847#ifdef CONFIG_X86_64
848 load_gs_index(vmx->host_state.gs_sel);
849#else
850 loadsegment(gs, vmx->host_state.gs_sel);
851#endif
852 }
853 if (vmx->host_state.fs_reload_needed)
854 loadsegment(fs, vmx->host_state.fs_sel);
855 reload_tss();
856#ifdef CONFIG_X86_64
857 wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base);
858#endif
859 if (current_thread_info()->status & TS_USEDFPU)
860 clts();
861 load_gdt(&__get_cpu_var(host_gdt));
862}
863
864static void vmx_load_host_state(struct vcpu_vmx *vmx)
865{
866 preempt_disable();
867 __vmx_load_host_state(vmx);
868 preempt_enable();
869}
870
871/*
872 * Switches to specified vcpu, until a matching vcpu_put(), but assumes
873 * vcpu mutex is already taken.
874 */
875static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
876{
877 struct vcpu_vmx *vmx = to_vmx(vcpu);
878 u64 phys_addr = __pa(per_cpu(vmxarea, cpu));
879
880 if (!vmm_exclusive)
881 kvm_cpu_vmxon(phys_addr);
882 else if (vcpu->cpu != cpu)
883 vcpu_clear(vmx);
884
885 if (per_cpu(current_vmcs, cpu) != vmx->vmcs) {
886 per_cpu(current_vmcs, cpu) = vmx->vmcs;
887 vmcs_load(vmx->vmcs);
888 }
889
890 if (vcpu->cpu != cpu) {
891 struct desc_ptr *gdt = &__get_cpu_var(host_gdt);
892 unsigned long sysenter_esp;
893
894 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
895 local_irq_disable();
896 list_add(&vmx->local_vcpus_link,
897 &per_cpu(vcpus_on_cpu, cpu));
898 local_irq_enable();
899
900 /*
901 * Linux uses per-cpu TSS and GDT, so set these when switching
902 * processors.
903 */
904 vmcs_writel(HOST_TR_BASE, kvm_read_tr_base()); /* 22.2.4 */
905 vmcs_writel(HOST_GDTR_BASE, gdt->address); /* 22.2.4 */
906
907 rdmsrl(MSR_IA32_SYSENTER_ESP, sysenter_esp);
908 vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */
909 }
910}
911
912static void vmx_vcpu_put(struct kvm_vcpu *vcpu)
913{
914 __vmx_load_host_state(to_vmx(vcpu));
915 if (!vmm_exclusive) {
916 __vcpu_clear(to_vmx(vcpu));
917 kvm_cpu_vmxoff();
918 }
919}
920
921static void vmx_fpu_activate(struct kvm_vcpu *vcpu)
922{
923 ulong cr0;
924
925 if (vcpu->fpu_active)
926 return;
927 vcpu->fpu_active = 1;
928 cr0 = vmcs_readl(GUEST_CR0);
929 cr0 &= ~(X86_CR0_TS | X86_CR0_MP);
930 cr0 |= kvm_read_cr0_bits(vcpu, X86_CR0_TS | X86_CR0_MP);
931 vmcs_writel(GUEST_CR0, cr0);
932 update_exception_bitmap(vcpu);
933 vcpu->arch.cr0_guest_owned_bits = X86_CR0_TS;
934 vmcs_writel(CR0_GUEST_HOST_MASK, ~vcpu->arch.cr0_guest_owned_bits);
935}
936
937static void vmx_decache_cr0_guest_bits(struct kvm_vcpu *vcpu);
938
939static void vmx_fpu_deactivate(struct kvm_vcpu *vcpu)
940{
941 vmx_decache_cr0_guest_bits(vcpu);
942 vmcs_set_bits(GUEST_CR0, X86_CR0_TS | X86_CR0_MP);
943 update_exception_bitmap(vcpu);
944 vcpu->arch.cr0_guest_owned_bits = 0;
945 vmcs_writel(CR0_GUEST_HOST_MASK, ~vcpu->arch.cr0_guest_owned_bits);
946 vmcs_writel(CR0_READ_SHADOW, vcpu->arch.cr0);
947}
948
949static unsigned long vmx_get_rflags(struct kvm_vcpu *vcpu)
950{
951 unsigned long rflags, save_rflags;
952
953 rflags = vmcs_readl(GUEST_RFLAGS);
954 if (to_vmx(vcpu)->rmode.vm86_active) {
955 rflags &= RMODE_GUEST_OWNED_EFLAGS_BITS;
956 save_rflags = to_vmx(vcpu)->rmode.save_rflags;
957 rflags |= save_rflags & ~RMODE_GUEST_OWNED_EFLAGS_BITS;
958 }
959 return rflags;
960}
961
962static void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
963{
964 if (to_vmx(vcpu)->rmode.vm86_active) {
965 to_vmx(vcpu)->rmode.save_rflags = rflags;
966 rflags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM;
967 }
968 vmcs_writel(GUEST_RFLAGS, rflags);
969}
970
971static u32 vmx_get_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
972{
973 u32 interruptibility = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
974 int ret = 0;
975
976 if (interruptibility & GUEST_INTR_STATE_STI)
977 ret |= KVM_X86_SHADOW_INT_STI;
978 if (interruptibility & GUEST_INTR_STATE_MOV_SS)
979 ret |= KVM_X86_SHADOW_INT_MOV_SS;
980
981 return ret & mask;
982}
983
984static void vmx_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
985{
986 u32 interruptibility_old = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
987 u32 interruptibility = interruptibility_old;
988
989 interruptibility &= ~(GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS);
990
991 if (mask & KVM_X86_SHADOW_INT_MOV_SS)
992 interruptibility |= GUEST_INTR_STATE_MOV_SS;
993 else if (mask & KVM_X86_SHADOW_INT_STI)
994 interruptibility |= GUEST_INTR_STATE_STI;
995
996 if ((interruptibility != interruptibility_old))
997 vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, interruptibility);
998}
999
1000static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
1001{
1002 unsigned long rip;
1003
1004 rip = kvm_rip_read(vcpu);
1005 rip += vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
1006 kvm_rip_write(vcpu, rip);
1007
1008 /* skipping an emulated instruction also counts */
1009 vmx_set_interrupt_shadow(vcpu, 0);
1010}
1011
1012static void vmx_queue_exception(struct kvm_vcpu *vcpu, unsigned nr,
1013 bool has_error_code, u32 error_code,
1014 bool reinject)
1015{
1016 struct vcpu_vmx *vmx = to_vmx(vcpu);
1017 u32 intr_info = nr | INTR_INFO_VALID_MASK;
1018
1019 if (has_error_code) {
1020 vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, error_code);
1021 intr_info |= INTR_INFO_DELIVER_CODE_MASK;
1022 }
1023
1024 if (vmx->rmode.vm86_active) {
1025 if (kvm_inject_realmode_interrupt(vcpu, nr) != EMULATE_DONE)
1026 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
1027 return;
1028 }
1029
1030 if (kvm_exception_is_soft(nr)) {
1031 vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
1032 vmx->vcpu.arch.event_exit_inst_len);
1033 intr_info |= INTR_TYPE_SOFT_EXCEPTION;
1034 } else
1035 intr_info |= INTR_TYPE_HARD_EXCEPTION;
1036
1037 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr_info);
1038}
1039
1040static bool vmx_rdtscp_supported(void)
1041{
1042 return cpu_has_vmx_rdtscp();
1043}
1044
1045/*
1046 * Swap MSR entry in host/guest MSR entry array.
1047 */
1048static void move_msr_up(struct vcpu_vmx *vmx, int from, int to)
1049{
1050 struct shared_msr_entry tmp;
1051
1052 tmp = vmx->guest_msrs[to];
1053 vmx->guest_msrs[to] = vmx->guest_msrs[from];
1054 vmx->guest_msrs[from] = tmp;
1055}
1056
1057/*
1058 * Set up the vmcs to automatically save and restore system
1059 * msrs. Don't touch the 64-bit msrs if the guest is in legacy
1060 * mode, as fiddling with msrs is very expensive.
1061 */
1062static void setup_msrs(struct vcpu_vmx *vmx)
1063{
1064 int save_nmsrs, index;
1065 unsigned long *msr_bitmap;
1066
1067 vmx_load_host_state(vmx);
1068 save_nmsrs = 0;
1069#ifdef CONFIG_X86_64
1070 if (is_long_mode(&vmx->vcpu)) {
1071 index = __find_msr_index(vmx, MSR_SYSCALL_MASK);
1072 if (index >= 0)
1073 move_msr_up(vmx, index, save_nmsrs++);
1074 index = __find_msr_index(vmx, MSR_LSTAR);
1075 if (index >= 0)
1076 move_msr_up(vmx, index, save_nmsrs++);
1077 index = __find_msr_index(vmx, MSR_CSTAR);
1078 if (index >= 0)
1079 move_msr_up(vmx, index, save_nmsrs++);
1080 index = __find_msr_index(vmx, MSR_TSC_AUX);
1081 if (index >= 0 && vmx->rdtscp_enabled)
1082 move_msr_up(vmx, index, save_nmsrs++);
1083 /*
1084 * MSR_STAR is only needed on long mode guests, and only
1085 * if efer.sce is enabled.
1086 */
1087 index = __find_msr_index(vmx, MSR_STAR);
1088 if ((index >= 0) && (vmx->vcpu.arch.efer & EFER_SCE))
1089 move_msr_up(vmx, index, save_nmsrs++);
1090 }
1091#endif
1092 index = __find_msr_index(vmx, MSR_EFER);
1093 if (index >= 0 && update_transition_efer(vmx, index))
1094 move_msr_up(vmx, index, save_nmsrs++);
1095
1096 vmx->save_nmsrs = save_nmsrs;
1097
1098 if (cpu_has_vmx_msr_bitmap()) {
1099 if (is_long_mode(&vmx->vcpu))
1100 msr_bitmap = vmx_msr_bitmap_longmode;
1101 else
1102 msr_bitmap = vmx_msr_bitmap_legacy;
1103
1104 vmcs_write64(MSR_BITMAP, __pa(msr_bitmap));
1105 }
1106}
1107
1108/*
1109 * reads and returns guest's timestamp counter "register"
1110 * guest_tsc = host_tsc + tsc_offset -- 21.3
1111 */
1112static u64 guest_read_tsc(void)
1113{
1114 u64 host_tsc, tsc_offset;
1115
1116 rdtscll(host_tsc);
1117 tsc_offset = vmcs_read64(TSC_OFFSET);
1118 return host_tsc + tsc_offset;
1119}
1120
1121/*
1122 * writes 'offset' into guest's timestamp counter offset register
1123 */
1124static void vmx_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset)
1125{
1126 vmcs_write64(TSC_OFFSET, offset);
1127}
1128
1129static void vmx_adjust_tsc_offset(struct kvm_vcpu *vcpu, s64 adjustment)
1130{
1131 u64 offset = vmcs_read64(TSC_OFFSET);
1132 vmcs_write64(TSC_OFFSET, offset + adjustment);
1133}
1134
1135/*
1136 * Reads an msr value (of 'msr_index') into 'pdata'.
1137 * Returns 0 on success, non-0 otherwise.
1138 * Assumes vcpu_load() was already called.
1139 */
1140static int vmx_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1141{
1142 u64 data;
1143 struct shared_msr_entry *msr;
1144
1145 if (!pdata) {
1146 printk(KERN_ERR "BUG: get_msr called with NULL pdata\n");
1147 return -EINVAL;
1148 }
1149
1150 switch (msr_index) {
1151#ifdef CONFIG_X86_64
1152 case MSR_FS_BASE:
1153 data = vmcs_readl(GUEST_FS_BASE);
1154 break;
1155 case MSR_GS_BASE:
1156 data = vmcs_readl(GUEST_GS_BASE);
1157 break;
1158 case MSR_KERNEL_GS_BASE:
1159 vmx_load_host_state(to_vmx(vcpu));
1160 data = to_vmx(vcpu)->msr_guest_kernel_gs_base;
1161 break;
1162#endif
1163 case MSR_EFER:
1164 return kvm_get_msr_common(vcpu, msr_index, pdata);
1165 case MSR_IA32_TSC:
1166 data = guest_read_tsc();
1167 break;
1168 case MSR_IA32_SYSENTER_CS:
1169 data = vmcs_read32(GUEST_SYSENTER_CS);
1170 break;
1171 case MSR_IA32_SYSENTER_EIP:
1172 data = vmcs_readl(GUEST_SYSENTER_EIP);
1173 break;
1174 case MSR_IA32_SYSENTER_ESP:
1175 data = vmcs_readl(GUEST_SYSENTER_ESP);
1176 break;
1177 case MSR_TSC_AUX:
1178 if (!to_vmx(vcpu)->rdtscp_enabled)
1179 return 1;
1180 /* Otherwise falls through */
1181 default:
1182 vmx_load_host_state(to_vmx(vcpu));
1183 msr = find_msr_entry(to_vmx(vcpu), msr_index);
1184 if (msr) {
1185 vmx_load_host_state(to_vmx(vcpu));
1186 data = msr->data;
1187 break;
1188 }
1189 return kvm_get_msr_common(vcpu, msr_index, pdata);
1190 }
1191
1192 *pdata = data;
1193 return 0;
1194}
1195
1196/*
1197 * Writes msr value into into the appropriate "register".
1198 * Returns 0 on success, non-0 otherwise.
1199 * Assumes vcpu_load() was already called.
1200 */
1201static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1202{
1203 struct vcpu_vmx *vmx = to_vmx(vcpu);
1204 struct shared_msr_entry *msr;
1205 int ret = 0;
1206
1207 switch (msr_index) {
1208 case MSR_EFER:
1209 vmx_load_host_state(vmx);
1210 ret = kvm_set_msr_common(vcpu, msr_index, data);
1211 break;
1212#ifdef CONFIG_X86_64
1213 case MSR_FS_BASE:
1214 vmcs_writel(GUEST_FS_BASE, data);
1215 break;
1216 case MSR_GS_BASE:
1217 vmcs_writel(GUEST_GS_BASE, data);
1218 break;
1219 case MSR_KERNEL_GS_BASE:
1220 vmx_load_host_state(vmx);
1221 vmx->msr_guest_kernel_gs_base = data;
1222 break;
1223#endif
1224 case MSR_IA32_SYSENTER_CS:
1225 vmcs_write32(GUEST_SYSENTER_CS, data);
1226 break;
1227 case MSR_IA32_SYSENTER_EIP:
1228 vmcs_writel(GUEST_SYSENTER_EIP, data);
1229 break;
1230 case MSR_IA32_SYSENTER_ESP:
1231 vmcs_writel(GUEST_SYSENTER_ESP, data);
1232 break;
1233 case MSR_IA32_TSC:
1234 kvm_write_tsc(vcpu, data);
1235 break;
1236 case MSR_IA32_CR_PAT:
1237 if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) {
1238 vmcs_write64(GUEST_IA32_PAT, data);
1239 vcpu->arch.pat = data;
1240 break;
1241 }
1242 ret = kvm_set_msr_common(vcpu, msr_index, data);
1243 break;
1244 case MSR_TSC_AUX:
1245 if (!vmx->rdtscp_enabled)
1246 return 1;
1247 /* Check reserved bit, higher 32 bits should be zero */
1248 if ((data >> 32) != 0)
1249 return 1;
1250 /* Otherwise falls through */
1251 default:
1252 msr = find_msr_entry(vmx, msr_index);
1253 if (msr) {
1254 vmx_load_host_state(vmx);
1255 msr->data = data;
1256 break;
1257 }
1258 ret = kvm_set_msr_common(vcpu, msr_index, data);
1259 }
1260
1261 return ret;
1262}
1263
1264static void vmx_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg)
1265{
1266 __set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail);
1267 switch (reg) {
1268 case VCPU_REGS_RSP:
1269 vcpu->arch.regs[VCPU_REGS_RSP] = vmcs_readl(GUEST_RSP);
1270 break;
1271 case VCPU_REGS_RIP:
1272 vcpu->arch.regs[VCPU_REGS_RIP] = vmcs_readl(GUEST_RIP);
1273 break;
1274 case VCPU_EXREG_PDPTR:
1275 if (enable_ept)
1276 ept_save_pdptrs(vcpu);
1277 break;
1278 default:
1279 break;
1280 }
1281}
1282
1283static void set_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg)
1284{
1285 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)
1286 vmcs_writel(GUEST_DR7, dbg->arch.debugreg[7]);
1287 else
1288 vmcs_writel(GUEST_DR7, vcpu->arch.dr7);
1289
1290 update_exception_bitmap(vcpu);
1291}
1292
1293static __init int cpu_has_kvm_support(void)
1294{
1295 return cpu_has_vmx();
1296}
1297
1298static __init int vmx_disabled_by_bios(void)
1299{
1300 u64 msr;
1301
1302 rdmsrl(MSR_IA32_FEATURE_CONTROL, msr);
1303 if (msr & FEATURE_CONTROL_LOCKED) {
1304 if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX)
1305 && tboot_enabled())
1306 return 1;
1307 if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX)
1308 && !tboot_enabled())
1309 return 1;
1310 }
1311
1312 return 0;
1313 /* locked but not enabled */
1314}
1315
1316static void kvm_cpu_vmxon(u64 addr)
1317{
1318 asm volatile (ASM_VMX_VMXON_RAX
1319 : : "a"(&addr), "m"(addr)
1320 : "memory", "cc");
1321}
1322
1323static int hardware_enable(void *garbage)
1324{
1325 int cpu = raw_smp_processor_id();
1326 u64 phys_addr = __pa(per_cpu(vmxarea, cpu));
1327 u64 old, test_bits;
1328
1329 if (read_cr4() & X86_CR4_VMXE)
1330 return -EBUSY;
1331
1332 INIT_LIST_HEAD(&per_cpu(vcpus_on_cpu, cpu));
1333 rdmsrl(MSR_IA32_FEATURE_CONTROL, old);
1334
1335 test_bits = FEATURE_CONTROL_LOCKED;
1336 test_bits |= FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX;
1337 if (tboot_enabled())
1338 test_bits |= FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX;
1339
1340 if ((old & test_bits) != test_bits) {
1341 /* enable and lock */
1342 wrmsrl(MSR_IA32_FEATURE_CONTROL, old | test_bits);
1343 }
1344 write_cr4(read_cr4() | X86_CR4_VMXE); /* FIXME: not cpu hotplug safe */
1345
1346 if (vmm_exclusive) {
1347 kvm_cpu_vmxon(phys_addr);
1348 ept_sync_global();
1349 }
1350
1351 store_gdt(&__get_cpu_var(host_gdt));
1352
1353 return 0;
1354}
1355
1356static void vmclear_local_vcpus(void)
1357{
1358 int cpu = raw_smp_processor_id();
1359 struct vcpu_vmx *vmx, *n;
1360
1361 list_for_each_entry_safe(vmx, n, &per_cpu(vcpus_on_cpu, cpu),
1362 local_vcpus_link)
1363 __vcpu_clear(vmx);
1364}
1365
1366
1367/* Just like cpu_vmxoff(), but with the __kvm_handle_fault_on_reboot()
1368 * tricks.
1369 */
1370static void kvm_cpu_vmxoff(void)
1371{
1372 asm volatile (__ex(ASM_VMX_VMXOFF) : : : "cc");
1373}
1374
1375static void hardware_disable(void *garbage)
1376{
1377 if (vmm_exclusive) {
1378 vmclear_local_vcpus();
1379 kvm_cpu_vmxoff();
1380 }
1381 write_cr4(read_cr4() & ~X86_CR4_VMXE);
1382}
1383
1384static __init int adjust_vmx_controls(u32 ctl_min, u32 ctl_opt,
1385 u32 msr, u32 *result)
1386{
1387 u32 vmx_msr_low, vmx_msr_high;
1388 u32 ctl = ctl_min | ctl_opt;
1389
1390 rdmsr(msr, vmx_msr_low, vmx_msr_high);
1391
1392 ctl &= vmx_msr_high; /* bit == 0 in high word ==> must be zero */
1393 ctl |= vmx_msr_low; /* bit == 1 in low word ==> must be one */
1394
1395 /* Ensure minimum (required) set of control bits are supported. */
1396 if (ctl_min & ~ctl)
1397 return -EIO;
1398
1399 *result = ctl;
1400 return 0;
1401}
1402
1403static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
1404{
1405 u32 vmx_msr_low, vmx_msr_high;
1406 u32 min, opt, min2, opt2;
1407 u32 _pin_based_exec_control = 0;
1408 u32 _cpu_based_exec_control = 0;
1409 u32 _cpu_based_2nd_exec_control = 0;
1410 u32 _vmexit_control = 0;
1411 u32 _vmentry_control = 0;
1412
1413 min = PIN_BASED_EXT_INTR_MASK | PIN_BASED_NMI_EXITING;
1414 opt = PIN_BASED_VIRTUAL_NMIS;
1415 if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PINBASED_CTLS,
1416 &_pin_based_exec_control) < 0)
1417 return -EIO;
1418
1419 min = CPU_BASED_HLT_EXITING |
1420#ifdef CONFIG_X86_64
1421 CPU_BASED_CR8_LOAD_EXITING |
1422 CPU_BASED_CR8_STORE_EXITING |
1423#endif
1424 CPU_BASED_CR3_LOAD_EXITING |
1425 CPU_BASED_CR3_STORE_EXITING |
1426 CPU_BASED_USE_IO_BITMAPS |
1427 CPU_BASED_MOV_DR_EXITING |
1428 CPU_BASED_USE_TSC_OFFSETING |
1429 CPU_BASED_MWAIT_EXITING |
1430 CPU_BASED_MONITOR_EXITING |
1431 CPU_BASED_INVLPG_EXITING;
1432 opt = CPU_BASED_TPR_SHADOW |
1433 CPU_BASED_USE_MSR_BITMAPS |
1434 CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
1435 if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS,
1436 &_cpu_based_exec_control) < 0)
1437 return -EIO;
1438#ifdef CONFIG_X86_64
1439 if ((_cpu_based_exec_control & CPU_BASED_TPR_SHADOW))
1440 _cpu_based_exec_control &= ~CPU_BASED_CR8_LOAD_EXITING &
1441 ~CPU_BASED_CR8_STORE_EXITING;
1442#endif
1443 if (_cpu_based_exec_control & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) {
1444 min2 = 0;
1445 opt2 = SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |
1446 SECONDARY_EXEC_WBINVD_EXITING |
1447 SECONDARY_EXEC_ENABLE_VPID |
1448 SECONDARY_EXEC_ENABLE_EPT |
1449 SECONDARY_EXEC_UNRESTRICTED_GUEST |
1450 SECONDARY_EXEC_PAUSE_LOOP_EXITING |
1451 SECONDARY_EXEC_RDTSCP;
1452 if (adjust_vmx_controls(min2, opt2,
1453 MSR_IA32_VMX_PROCBASED_CTLS2,
1454 &_cpu_based_2nd_exec_control) < 0)
1455 return -EIO;
1456 }
1457#ifndef CONFIG_X86_64
1458 if (!(_cpu_based_2nd_exec_control &
1459 SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES))
1460 _cpu_based_exec_control &= ~CPU_BASED_TPR_SHADOW;
1461#endif
1462 if (_cpu_based_2nd_exec_control & SECONDARY_EXEC_ENABLE_EPT) {
1463 /* CR3 accesses and invlpg don't need to cause VM Exits when EPT
1464 enabled */
1465 _cpu_based_exec_control &= ~(CPU_BASED_CR3_LOAD_EXITING |
1466 CPU_BASED_CR3_STORE_EXITING |
1467 CPU_BASED_INVLPG_EXITING);
1468 rdmsr(MSR_IA32_VMX_EPT_VPID_CAP,
1469 vmx_capability.ept, vmx_capability.vpid);
1470 }
1471
1472 min = 0;
1473#ifdef CONFIG_X86_64
1474 min |= VM_EXIT_HOST_ADDR_SPACE_SIZE;
1475#endif
1476 opt = VM_EXIT_SAVE_IA32_PAT | VM_EXIT_LOAD_IA32_PAT;
1477 if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_EXIT_CTLS,
1478 &_vmexit_control) < 0)
1479 return -EIO;
1480
1481 min = 0;
1482 opt = VM_ENTRY_LOAD_IA32_PAT;
1483 if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_ENTRY_CTLS,
1484 &_vmentry_control) < 0)
1485 return -EIO;
1486
1487 rdmsr(MSR_IA32_VMX_BASIC, vmx_msr_low, vmx_msr_high);
1488
1489 /* IA-32 SDM Vol 3B: VMCS size is never greater than 4kB. */
1490 if ((vmx_msr_high & 0x1fff) > PAGE_SIZE)
1491 return -EIO;
1492
1493#ifdef CONFIG_X86_64
1494 /* IA-32 SDM Vol 3B: 64-bit CPUs always have VMX_BASIC_MSR[48]==0. */
1495 if (vmx_msr_high & (1u<<16))
1496 return -EIO;
1497#endif
1498
1499 /* Require Write-Back (WB) memory type for VMCS accesses. */
1500 if (((vmx_msr_high >> 18) & 15) != 6)
1501 return -EIO;
1502
1503 vmcs_conf->size = vmx_msr_high & 0x1fff;
1504 vmcs_conf->order = get_order(vmcs_config.size);
1505 vmcs_conf->revision_id = vmx_msr_low;
1506
1507 vmcs_conf->pin_based_exec_ctrl = _pin_based_exec_control;
1508 vmcs_conf->cpu_based_exec_ctrl = _cpu_based_exec_control;
1509 vmcs_conf->cpu_based_2nd_exec_ctrl = _cpu_based_2nd_exec_control;
1510 vmcs_conf->vmexit_ctrl = _vmexit_control;
1511 vmcs_conf->vmentry_ctrl = _vmentry_control;
1512
1513 return 0;
1514}
1515
1516static struct vmcs *alloc_vmcs_cpu(int cpu)
1517{
1518 int node = cpu_to_node(cpu);
1519 struct page *pages;
1520 struct vmcs *vmcs;
1521
1522 pages = alloc_pages_exact_node(node, GFP_KERNEL, vmcs_config.order);
1523 if (!pages)
1524 return NULL;
1525 vmcs = page_address(pages);
1526 memset(vmcs, 0, vmcs_config.size);
1527 vmcs->revision_id = vmcs_config.revision_id; /* vmcs revision id */
1528 return vmcs;
1529}
1530
1531static struct vmcs *alloc_vmcs(void)
1532{
1533 return alloc_vmcs_cpu(raw_smp_processor_id());
1534}
1535
1536static void free_vmcs(struct vmcs *vmcs)
1537{
1538 free_pages((unsigned long)vmcs, vmcs_config.order);
1539}
1540
1541static void free_kvm_area(void)
1542{
1543 int cpu;
1544
1545 for_each_possible_cpu(cpu) {
1546 free_vmcs(per_cpu(vmxarea, cpu));
1547 per_cpu(vmxarea, cpu) = NULL;
1548 }
1549}
1550
1551static __init int alloc_kvm_area(void)
1552{
1553 int cpu;
1554
1555 for_each_possible_cpu(cpu) {
1556 struct vmcs *vmcs;
1557
1558 vmcs = alloc_vmcs_cpu(cpu);
1559 if (!vmcs) {
1560 free_kvm_area();
1561 return -ENOMEM;
1562 }
1563
1564 per_cpu(vmxarea, cpu) = vmcs;
1565 }
1566 return 0;
1567}
1568
1569static __init int hardware_setup(void)
1570{
1571 if (setup_vmcs_config(&vmcs_config) < 0)
1572 return -EIO;
1573
1574 if (boot_cpu_has(X86_FEATURE_NX))
1575 kvm_enable_efer_bits(EFER_NX);
1576
1577 if (!cpu_has_vmx_vpid())
1578 enable_vpid = 0;
1579
1580 if (!cpu_has_vmx_ept() ||
1581 !cpu_has_vmx_ept_4levels()) {
1582 enable_ept = 0;
1583 enable_unrestricted_guest = 0;
1584 }
1585
1586 if (!cpu_has_vmx_unrestricted_guest())
1587 enable_unrestricted_guest = 0;
1588
1589 if (!cpu_has_vmx_flexpriority())
1590 flexpriority_enabled = 0;
1591
1592 if (!cpu_has_vmx_tpr_shadow())
1593 kvm_x86_ops->update_cr8_intercept = NULL;
1594
1595 if (enable_ept && !cpu_has_vmx_ept_2m_page())
1596 kvm_disable_largepages();
1597
1598 if (!cpu_has_vmx_ple())
1599 ple_gap = 0;
1600
1601 return alloc_kvm_area();
1602}
1603
1604static __exit void hardware_unsetup(void)
1605{
1606 free_kvm_area();
1607}
1608
1609static void fix_pmode_dataseg(int seg, struct kvm_save_segment *save)
1610{
1611 struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
1612
1613 if (vmcs_readl(sf->base) == save->base && (save->base & AR_S_MASK)) {
1614 vmcs_write16(sf->selector, save->selector);
1615 vmcs_writel(sf->base, save->base);
1616 vmcs_write32(sf->limit, save->limit);
1617 vmcs_write32(sf->ar_bytes, save->ar);
1618 } else {
1619 u32 dpl = (vmcs_read16(sf->selector) & SELECTOR_RPL_MASK)
1620 << AR_DPL_SHIFT;
1621 vmcs_write32(sf->ar_bytes, 0x93 | dpl);
1622 }
1623}
1624
1625static void enter_pmode(struct kvm_vcpu *vcpu)
1626{
1627 unsigned long flags;
1628 struct vcpu_vmx *vmx = to_vmx(vcpu);
1629
1630 vmx->emulation_required = 1;
1631 vmx->rmode.vm86_active = 0;
1632
1633 vmcs_writel(GUEST_TR_BASE, vmx->rmode.tr.base);
1634 vmcs_write32(GUEST_TR_LIMIT, vmx->rmode.tr.limit);
1635 vmcs_write32(GUEST_TR_AR_BYTES, vmx->rmode.tr.ar);
1636
1637 flags = vmcs_readl(GUEST_RFLAGS);
1638 flags &= RMODE_GUEST_OWNED_EFLAGS_BITS;
1639 flags |= vmx->rmode.save_rflags & ~RMODE_GUEST_OWNED_EFLAGS_BITS;
1640 vmcs_writel(GUEST_RFLAGS, flags);
1641
1642 vmcs_writel(GUEST_CR4, (vmcs_readl(GUEST_CR4) & ~X86_CR4_VME) |
1643 (vmcs_readl(CR4_READ_SHADOW) & X86_CR4_VME));
1644
1645 update_exception_bitmap(vcpu);
1646
1647 if (emulate_invalid_guest_state)
1648 return;
1649
1650 fix_pmode_dataseg(VCPU_SREG_ES, &vmx->rmode.es);
1651 fix_pmode_dataseg(VCPU_SREG_DS, &vmx->rmode.ds);
1652 fix_pmode_dataseg(VCPU_SREG_GS, &vmx->rmode.gs);
1653 fix_pmode_dataseg(VCPU_SREG_FS, &vmx->rmode.fs);
1654
1655 vmcs_write16(GUEST_SS_SELECTOR, 0);
1656 vmcs_write32(GUEST_SS_AR_BYTES, 0x93);
1657
1658 vmcs_write16(GUEST_CS_SELECTOR,
1659 vmcs_read16(GUEST_CS_SELECTOR) & ~SELECTOR_RPL_MASK);
1660 vmcs_write32(GUEST_CS_AR_BYTES, 0x9b);
1661}
1662
1663static gva_t rmode_tss_base(struct kvm *kvm)
1664{
1665 if (!kvm->arch.tss_addr) {
1666 struct kvm_memslots *slots;
1667 gfn_t base_gfn;
1668
1669 slots = kvm_memslots(kvm);
1670 base_gfn = slots->memslots[0].base_gfn +
1671 kvm->memslots->memslots[0].npages - 3;
1672 return base_gfn << PAGE_SHIFT;
1673 }
1674 return kvm->arch.tss_addr;
1675}
1676
1677static void fix_rmode_seg(int seg, struct kvm_save_segment *save)
1678{
1679 struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
1680
1681 save->selector = vmcs_read16(sf->selector);
1682 save->base = vmcs_readl(sf->base);
1683 save->limit = vmcs_read32(sf->limit);
1684 save->ar = vmcs_read32(sf->ar_bytes);
1685 vmcs_write16(sf->selector, save->base >> 4);
1686 vmcs_write32(sf->base, save->base & 0xfffff);
1687 vmcs_write32(sf->limit, 0xffff);
1688 vmcs_write32(sf->ar_bytes, 0xf3);
1689}
1690
1691static void enter_rmode(struct kvm_vcpu *vcpu)
1692{
1693 unsigned long flags;
1694 struct vcpu_vmx *vmx = to_vmx(vcpu);
1695
1696 if (enable_unrestricted_guest)
1697 return;
1698
1699 vmx->emulation_required = 1;
1700 vmx->rmode.vm86_active = 1;
1701
1702 vmx->rmode.tr.base = vmcs_readl(GUEST_TR_BASE);
1703 vmcs_writel(GUEST_TR_BASE, rmode_tss_base(vcpu->kvm));
1704
1705 vmx->rmode.tr.limit = vmcs_read32(GUEST_TR_LIMIT);
1706 vmcs_write32(GUEST_TR_LIMIT, RMODE_TSS_SIZE - 1);
1707
1708 vmx->rmode.tr.ar = vmcs_read32(GUEST_TR_AR_BYTES);
1709 vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);
1710
1711 flags = vmcs_readl(GUEST_RFLAGS);
1712 vmx->rmode.save_rflags = flags;
1713
1714 flags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM;
1715
1716 vmcs_writel(GUEST_RFLAGS, flags);
1717 vmcs_writel(GUEST_CR4, vmcs_readl(GUEST_CR4) | X86_CR4_VME);
1718 update_exception_bitmap(vcpu);
1719
1720 if (emulate_invalid_guest_state)
1721 goto continue_rmode;
1722
1723 vmcs_write16(GUEST_SS_SELECTOR, vmcs_readl(GUEST_SS_BASE) >> 4);
1724 vmcs_write32(GUEST_SS_LIMIT, 0xffff);
1725 vmcs_write32(GUEST_SS_AR_BYTES, 0xf3);
1726
1727 vmcs_write32(GUEST_CS_AR_BYTES, 0xf3);
1728 vmcs_write32(GUEST_CS_LIMIT, 0xffff);
1729 if (vmcs_readl(GUEST_CS_BASE) == 0xffff0000)
1730 vmcs_writel(GUEST_CS_BASE, 0xf0000);
1731 vmcs_write16(GUEST_CS_SELECTOR, vmcs_readl(GUEST_CS_BASE) >> 4);
1732
1733 fix_rmode_seg(VCPU_SREG_ES, &vmx->rmode.es);
1734 fix_rmode_seg(VCPU_SREG_DS, &vmx->rmode.ds);
1735 fix_rmode_seg(VCPU_SREG_GS, &vmx->rmode.gs);
1736 fix_rmode_seg(VCPU_SREG_FS, &vmx->rmode.fs);
1737
1738continue_rmode:
1739 kvm_mmu_reset_context(vcpu);
1740 init_rmode(vcpu->kvm);
1741}
1742
1743static void vmx_set_efer(struct kvm_vcpu *vcpu, u64 efer)
1744{
1745 struct vcpu_vmx *vmx = to_vmx(vcpu);
1746 struct shared_msr_entry *msr = find_msr_entry(vmx, MSR_EFER);
1747
1748 if (!msr)
1749 return;
1750
1751 /*
1752 * Force kernel_gs_base reloading before EFER changes, as control
1753 * of this msr depends on is_long_mode().
1754 */
1755 vmx_load_host_state(to_vmx(vcpu));
1756 vcpu->arch.efer = efer;
1757 if (efer & EFER_LMA) {
1758 vmcs_write32(VM_ENTRY_CONTROLS,
1759 vmcs_read32(VM_ENTRY_CONTROLS) |
1760 VM_ENTRY_IA32E_MODE);
1761 msr->data = efer;
1762 } else {
1763 vmcs_write32(VM_ENTRY_CONTROLS,
1764 vmcs_read32(VM_ENTRY_CONTROLS) &
1765 ~VM_ENTRY_IA32E_MODE);
1766
1767 msr->data = efer & ~EFER_LME;
1768 }
1769 setup_msrs(vmx);
1770}
1771
1772#ifdef CONFIG_X86_64
1773
1774static void enter_lmode(struct kvm_vcpu *vcpu)
1775{
1776 u32 guest_tr_ar;
1777
1778 guest_tr_ar = vmcs_read32(GUEST_TR_AR_BYTES);
1779 if ((guest_tr_ar & AR_TYPE_MASK) != AR_TYPE_BUSY_64_TSS) {
1780 printk(KERN_DEBUG "%s: tss fixup for long mode. \n",
1781 __func__);
1782 vmcs_write32(GUEST_TR_AR_BYTES,
1783 (guest_tr_ar & ~AR_TYPE_MASK)
1784 | AR_TYPE_BUSY_64_TSS);
1785 }
1786 vmx_set_efer(vcpu, vcpu->arch.efer | EFER_LMA);
1787}
1788
1789static void exit_lmode(struct kvm_vcpu *vcpu)
1790{
1791 vmcs_write32(VM_ENTRY_CONTROLS,
1792 vmcs_read32(VM_ENTRY_CONTROLS)
1793 & ~VM_ENTRY_IA32E_MODE);
1794 vmx_set_efer(vcpu, vcpu->arch.efer & ~EFER_LMA);
1795}
1796
1797#endif
1798
1799static void vmx_flush_tlb(struct kvm_vcpu *vcpu)
1800{
1801 vpid_sync_context(to_vmx(vcpu));
1802 if (enable_ept) {
1803 if (!VALID_PAGE(vcpu->arch.mmu.root_hpa))
1804 return;
1805 ept_sync_context(construct_eptp(vcpu->arch.mmu.root_hpa));
1806 }
1807}
1808
1809static void vmx_decache_cr0_guest_bits(struct kvm_vcpu *vcpu)
1810{
1811 ulong cr0_guest_owned_bits = vcpu->arch.cr0_guest_owned_bits;
1812
1813 vcpu->arch.cr0 &= ~cr0_guest_owned_bits;
1814 vcpu->arch.cr0 |= vmcs_readl(GUEST_CR0) & cr0_guest_owned_bits;
1815}
1816
1817static void vmx_decache_cr4_guest_bits(struct kvm_vcpu *vcpu)
1818{
1819 ulong cr4_guest_owned_bits = vcpu->arch.cr4_guest_owned_bits;
1820
1821 vcpu->arch.cr4 &= ~cr4_guest_owned_bits;
1822 vcpu->arch.cr4 |= vmcs_readl(GUEST_CR4) & cr4_guest_owned_bits;
1823}
1824
1825static void ept_load_pdptrs(struct kvm_vcpu *vcpu)
1826{
1827 if (!test_bit(VCPU_EXREG_PDPTR,
1828 (unsigned long *)&vcpu->arch.regs_dirty))
1829 return;
1830
1831 if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) {
1832 vmcs_write64(GUEST_PDPTR0, vcpu->arch.mmu.pdptrs[0]);
1833 vmcs_write64(GUEST_PDPTR1, vcpu->arch.mmu.pdptrs[1]);
1834 vmcs_write64(GUEST_PDPTR2, vcpu->arch.mmu.pdptrs[2]);
1835 vmcs_write64(GUEST_PDPTR3, vcpu->arch.mmu.pdptrs[3]);
1836 }
1837}
1838
1839static void ept_save_pdptrs(struct kvm_vcpu *vcpu)
1840{
1841 if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) {
1842 vcpu->arch.mmu.pdptrs[0] = vmcs_read64(GUEST_PDPTR0);
1843 vcpu->arch.mmu.pdptrs[1] = vmcs_read64(GUEST_PDPTR1);
1844 vcpu->arch.mmu.pdptrs[2] = vmcs_read64(GUEST_PDPTR2);
1845 vcpu->arch.mmu.pdptrs[3] = vmcs_read64(GUEST_PDPTR3);
1846 }
1847
1848 __set_bit(VCPU_EXREG_PDPTR,
1849 (unsigned long *)&vcpu->arch.regs_avail);
1850 __set_bit(VCPU_EXREG_PDPTR,
1851 (unsigned long *)&vcpu->arch.regs_dirty);
1852}
1853
1854static void vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
1855
1856static void ept_update_paging_mode_cr0(unsigned long *hw_cr0,
1857 unsigned long cr0,
1858 struct kvm_vcpu *vcpu)
1859{
1860 if (!(cr0 & X86_CR0_PG)) {
1861 /* From paging/starting to nonpaging */
1862 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL,
1863 vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) |
1864 (CPU_BASED_CR3_LOAD_EXITING |
1865 CPU_BASED_CR3_STORE_EXITING));
1866 vcpu->arch.cr0 = cr0;
1867 vmx_set_cr4(vcpu, kvm_read_cr4(vcpu));
1868 } else if (!is_paging(vcpu)) {
1869 /* From nonpaging to paging */
1870 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL,
1871 vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) &
1872 ~(CPU_BASED_CR3_LOAD_EXITING |
1873 CPU_BASED_CR3_STORE_EXITING));
1874 vcpu->arch.cr0 = cr0;
1875 vmx_set_cr4(vcpu, kvm_read_cr4(vcpu));
1876 }
1877
1878 if (!(cr0 & X86_CR0_WP))
1879 *hw_cr0 &= ~X86_CR0_WP;
1880}
1881
1882static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
1883{
1884 struct vcpu_vmx *vmx = to_vmx(vcpu);
1885 unsigned long hw_cr0;
1886
1887 if (enable_unrestricted_guest)
1888 hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK_UNRESTRICTED_GUEST)
1889 | KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST;
1890 else
1891 hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK) | KVM_VM_CR0_ALWAYS_ON;
1892
1893 if (vmx->rmode.vm86_active && (cr0 & X86_CR0_PE))
1894 enter_pmode(vcpu);
1895
1896 if (!vmx->rmode.vm86_active && !(cr0 & X86_CR0_PE))
1897 enter_rmode(vcpu);
1898
1899#ifdef CONFIG_X86_64
1900 if (vcpu->arch.efer & EFER_LME) {
1901 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG))
1902 enter_lmode(vcpu);
1903 if (is_paging(vcpu) && !(cr0 & X86_CR0_PG))
1904 exit_lmode(vcpu);
1905 }
1906#endif
1907
1908 if (enable_ept)
1909 ept_update_paging_mode_cr0(&hw_cr0, cr0, vcpu);
1910
1911 if (!vcpu->fpu_active)
1912 hw_cr0 |= X86_CR0_TS | X86_CR0_MP;
1913
1914 vmcs_writel(CR0_READ_SHADOW, cr0);
1915 vmcs_writel(GUEST_CR0, hw_cr0);
1916 vcpu->arch.cr0 = cr0;
1917}
1918
1919static u64 construct_eptp(unsigned long root_hpa)
1920{
1921 u64 eptp;
1922
1923 /* TODO write the value reading from MSR */
1924 eptp = VMX_EPT_DEFAULT_MT |
1925 VMX_EPT_DEFAULT_GAW << VMX_EPT_GAW_EPTP_SHIFT;
1926 eptp |= (root_hpa & PAGE_MASK);
1927
1928 return eptp;
1929}
1930
1931static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
1932{
1933 unsigned long guest_cr3;
1934 u64 eptp;
1935
1936 guest_cr3 = cr3;
1937 if (enable_ept) {
1938 eptp = construct_eptp(cr3);
1939 vmcs_write64(EPT_POINTER, eptp);
1940 guest_cr3 = is_paging(vcpu) ? vcpu->arch.cr3 :
1941 vcpu->kvm->arch.ept_identity_map_addr;
1942 ept_load_pdptrs(vcpu);
1943 }
1944
1945 vmx_flush_tlb(vcpu);
1946 vmcs_writel(GUEST_CR3, guest_cr3);
1947}
1948
1949static void vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
1950{
1951 unsigned long hw_cr4 = cr4 | (to_vmx(vcpu)->rmode.vm86_active ?
1952 KVM_RMODE_VM_CR4_ALWAYS_ON : KVM_PMODE_VM_CR4_ALWAYS_ON);
1953
1954 vcpu->arch.cr4 = cr4;
1955 if (enable_ept) {
1956 if (!is_paging(vcpu)) {
1957 hw_cr4 &= ~X86_CR4_PAE;
1958 hw_cr4 |= X86_CR4_PSE;
1959 } else if (!(cr4 & X86_CR4_PAE)) {
1960 hw_cr4 &= ~X86_CR4_PAE;
1961 }
1962 }
1963
1964 vmcs_writel(CR4_READ_SHADOW, cr4);
1965 vmcs_writel(GUEST_CR4, hw_cr4);
1966}
1967
1968static u64 vmx_get_segment_base(struct kvm_vcpu *vcpu, int seg)
1969{
1970 struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
1971
1972 return vmcs_readl(sf->base);
1973}
1974
1975static void vmx_get_segment(struct kvm_vcpu *vcpu,
1976 struct kvm_segment *var, int seg)
1977{
1978 struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
1979 u32 ar;
1980
1981 var->base = vmcs_readl(sf->base);
1982 var->limit = vmcs_read32(sf->limit);
1983 var->selector = vmcs_read16(sf->selector);
1984 ar = vmcs_read32(sf->ar_bytes);
1985 if ((ar & AR_UNUSABLE_MASK) && !emulate_invalid_guest_state)
1986 ar = 0;
1987 var->type = ar & 15;
1988 var->s = (ar >> 4) & 1;
1989 var->dpl = (ar >> 5) & 3;
1990 var->present = (ar >> 7) & 1;
1991 var->avl = (ar >> 12) & 1;
1992 var->l = (ar >> 13) & 1;
1993 var->db = (ar >> 14) & 1;
1994 var->g = (ar >> 15) & 1;
1995 var->unusable = (ar >> 16) & 1;
1996}
1997
1998static int vmx_get_cpl(struct kvm_vcpu *vcpu)
1999{
2000 if (!is_protmode(vcpu))
2001 return 0;
2002
2003 if (vmx_get_rflags(vcpu) & X86_EFLAGS_VM) /* if virtual 8086 */
2004 return 3;
2005
2006 return vmcs_read16(GUEST_CS_SELECTOR) & 3;
2007}
2008
2009static u32 vmx_segment_access_rights(struct kvm_segment *var)
2010{
2011 u32 ar;
2012
2013 if (var->unusable)
2014 ar = 1 << 16;
2015 else {
2016 ar = var->type & 15;
2017 ar |= (var->s & 1) << 4;
2018 ar |= (var->dpl & 3) << 5;
2019 ar |= (var->present & 1) << 7;
2020 ar |= (var->avl & 1) << 12;
2021 ar |= (var->l & 1) << 13;
2022 ar |= (var->db & 1) << 14;
2023 ar |= (var->g & 1) << 15;
2024 }
2025 if (ar == 0) /* a 0 value means unusable */
2026 ar = AR_UNUSABLE_MASK;
2027
2028 return ar;
2029}
2030
2031static void vmx_set_segment(struct kvm_vcpu *vcpu,
2032 struct kvm_segment *var, int seg)
2033{
2034 struct vcpu_vmx *vmx = to_vmx(vcpu);
2035 struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
2036 u32 ar;
2037
2038 if (vmx->rmode.vm86_active && seg == VCPU_SREG_TR) {
2039 vmx->rmode.tr.selector = var->selector;
2040 vmx->rmode.tr.base = var->base;
2041 vmx->rmode.tr.limit = var->limit;
2042 vmx->rmode.tr.ar = vmx_segment_access_rights(var);
2043 return;
2044 }
2045 vmcs_writel(sf->base, var->base);
2046 vmcs_write32(sf->limit, var->limit);
2047 vmcs_write16(sf->selector, var->selector);
2048 if (vmx->rmode.vm86_active && var->s) {
2049 /*
2050 * Hack real-mode segments into vm86 compatibility.
2051 */
2052 if (var->base == 0xffff0000 && var->selector == 0xf000)
2053 vmcs_writel(sf->base, 0xf0000);
2054 ar = 0xf3;
2055 } else
2056 ar = vmx_segment_access_rights(var);
2057
2058 /*
2059 * Fix the "Accessed" bit in AR field of segment registers for older
2060 * qemu binaries.
2061 * IA32 arch specifies that at the time of processor reset the
2062 * "Accessed" bit in the AR field of segment registers is 1. And qemu
2063 * is setting it to 0 in the usedland code. This causes invalid guest
2064 * state vmexit when "unrestricted guest" mode is turned on.
2065 * Fix for this setup issue in cpu_reset is being pushed in the qemu
2066 * tree. Newer qemu binaries with that qemu fix would not need this
2067 * kvm hack.
2068 */
2069 if (enable_unrestricted_guest && (seg != VCPU_SREG_LDTR))
2070 ar |= 0x1; /* Accessed */
2071
2072 vmcs_write32(sf->ar_bytes, ar);
2073}
2074
2075static void vmx_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
2076{
2077 u32 ar = vmcs_read32(GUEST_CS_AR_BYTES);
2078
2079 *db = (ar >> 14) & 1;
2080 *l = (ar >> 13) & 1;
2081}
2082
2083static void vmx_get_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
2084{
2085 dt->size = vmcs_read32(GUEST_IDTR_LIMIT);
2086 dt->address = vmcs_readl(GUEST_IDTR_BASE);
2087}
2088
2089static void vmx_set_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
2090{
2091 vmcs_write32(GUEST_IDTR_LIMIT, dt->size);
2092 vmcs_writel(GUEST_IDTR_BASE, dt->address);
2093}
2094
2095static void vmx_get_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
2096{
2097 dt->size = vmcs_read32(GUEST_GDTR_LIMIT);
2098 dt->address = vmcs_readl(GUEST_GDTR_BASE);
2099}
2100
2101static void vmx_set_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
2102{
2103 vmcs_write32(GUEST_GDTR_LIMIT, dt->size);
2104 vmcs_writel(GUEST_GDTR_BASE, dt->address);
2105}
2106
2107static bool rmode_segment_valid(struct kvm_vcpu *vcpu, int seg)
2108{
2109 struct kvm_segment var;
2110 u32 ar;
2111
2112 vmx_get_segment(vcpu, &var, seg);
2113 ar = vmx_segment_access_rights(&var);
2114
2115 if (var.base != (var.selector << 4))
2116 return false;
2117 if (var.limit != 0xffff)
2118 return false;
2119 if (ar != 0xf3)
2120 return false;
2121
2122 return true;
2123}
2124
2125static bool code_segment_valid(struct kvm_vcpu *vcpu)
2126{
2127 struct kvm_segment cs;
2128 unsigned int cs_rpl;
2129
2130 vmx_get_segment(vcpu, &cs, VCPU_SREG_CS);
2131 cs_rpl = cs.selector & SELECTOR_RPL_MASK;
2132
2133 if (cs.unusable)
2134 return false;
2135 if (~cs.type & (AR_TYPE_CODE_MASK|AR_TYPE_ACCESSES_MASK))
2136 return false;
2137 if (!cs.s)
2138 return false;
2139 if (cs.type & AR_TYPE_WRITEABLE_MASK) {
2140 if (cs.dpl > cs_rpl)
2141 return false;
2142 } else {
2143 if (cs.dpl != cs_rpl)
2144 return false;
2145 }
2146 if (!cs.present)
2147 return false;
2148
2149 /* TODO: Add Reserved field check, this'll require a new member in the kvm_segment_field structure */
2150 return true;
2151}
2152
2153static bool stack_segment_valid(struct kvm_vcpu *vcpu)
2154{
2155 struct kvm_segment ss;
2156 unsigned int ss_rpl;
2157
2158 vmx_get_segment(vcpu, &ss, VCPU_SREG_SS);
2159 ss_rpl = ss.selector & SELECTOR_RPL_MASK;
2160
2161 if (ss.unusable)
2162 return true;
2163 if (ss.type != 3 && ss.type != 7)
2164 return false;
2165 if (!ss.s)
2166 return false;
2167 if (ss.dpl != ss_rpl) /* DPL != RPL */
2168 return false;
2169 if (!ss.present)
2170 return false;
2171
2172 return true;
2173}
2174
2175static bool data_segment_valid(struct kvm_vcpu *vcpu, int seg)
2176{
2177 struct kvm_segment var;
2178 unsigned int rpl;
2179
2180 vmx_get_segment(vcpu, &var, seg);
2181 rpl = var.selector & SELECTOR_RPL_MASK;
2182
2183 if (var.unusable)
2184 return true;
2185 if (!var.s)
2186 return false;
2187 if (!var.present)
2188 return false;
2189 if (~var.type & (AR_TYPE_CODE_MASK|AR_TYPE_WRITEABLE_MASK)) {
2190 if (var.dpl < rpl) /* DPL < RPL */
2191 return false;
2192 }
2193
2194 /* TODO: Add other members to kvm_segment_field to allow checking for other access
2195 * rights flags
2196 */
2197 return true;
2198}
2199
2200static bool tr_valid(struct kvm_vcpu *vcpu)
2201{
2202 struct kvm_segment tr;
2203
2204 vmx_get_segment(vcpu, &tr, VCPU_SREG_TR);
2205
2206 if (tr.unusable)
2207 return false;
2208 if (tr.selector & SELECTOR_TI_MASK) /* TI = 1 */
2209 return false;
2210 if (tr.type != 3 && tr.type != 11) /* TODO: Check if guest is in IA32e mode */
2211 return false;
2212 if (!tr.present)
2213 return false;
2214
2215 return true;
2216}
2217
2218static bool ldtr_valid(struct kvm_vcpu *vcpu)
2219{
2220 struct kvm_segment ldtr;
2221
2222 vmx_get_segment(vcpu, &ldtr, VCPU_SREG_LDTR);
2223
2224 if (ldtr.unusable)
2225 return true;
2226 if (ldtr.selector & SELECTOR_TI_MASK) /* TI = 1 */
2227 return false;
2228 if (ldtr.type != 2)
2229 return false;
2230 if (!ldtr.present)
2231 return false;
2232
2233 return true;
2234}
2235
2236static bool cs_ss_rpl_check(struct kvm_vcpu *vcpu)
2237{
2238 struct kvm_segment cs, ss;
2239
2240 vmx_get_segment(vcpu, &cs, VCPU_SREG_CS);
2241 vmx_get_segment(vcpu, &ss, VCPU_SREG_SS);
2242
2243 return ((cs.selector & SELECTOR_RPL_MASK) ==
2244 (ss.selector & SELECTOR_RPL_MASK));
2245}
2246
2247/*
2248 * Check if guest state is valid. Returns true if valid, false if
2249 * not.
2250 * We assume that registers are always usable
2251 */
2252static bool guest_state_valid(struct kvm_vcpu *vcpu)
2253{
2254 /* real mode guest state checks */
2255 if (!is_protmode(vcpu)) {
2256 if (!rmode_segment_valid(vcpu, VCPU_SREG_CS))
2257 return false;
2258 if (!rmode_segment_valid(vcpu, VCPU_SREG_SS))
2259 return false;
2260 if (!rmode_segment_valid(vcpu, VCPU_SREG_DS))
2261 return false;
2262 if (!rmode_segment_valid(vcpu, VCPU_SREG_ES))
2263 return false;
2264 if (!rmode_segment_valid(vcpu, VCPU_SREG_FS))
2265 return false;
2266 if (!rmode_segment_valid(vcpu, VCPU_SREG_GS))
2267 return false;
2268 } else {
2269 /* protected mode guest state checks */
2270 if (!cs_ss_rpl_check(vcpu))
2271 return false;
2272 if (!code_segment_valid(vcpu))
2273 return false;
2274 if (!stack_segment_valid(vcpu))
2275 return false;
2276 if (!data_segment_valid(vcpu, VCPU_SREG_DS))
2277 return false;
2278 if (!data_segment_valid(vcpu, VCPU_SREG_ES))
2279 return false;
2280 if (!data_segment_valid(vcpu, VCPU_SREG_FS))
2281 return false;
2282 if (!data_segment_valid(vcpu, VCPU_SREG_GS))
2283 return false;
2284 if (!tr_valid(vcpu))
2285 return false;
2286 if (!ldtr_valid(vcpu))
2287 return false;
2288 }
2289 /* TODO:
2290 * - Add checks on RIP
2291 * - Add checks on RFLAGS
2292 */
2293
2294 return true;
2295}
2296
2297static int init_rmode_tss(struct kvm *kvm)
2298{
2299 gfn_t fn = rmode_tss_base(kvm) >> PAGE_SHIFT;
2300 u16 data = 0;
2301 int ret = 0;
2302 int r;
2303
2304 r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE);
2305 if (r < 0)
2306 goto out;
2307 data = TSS_BASE_SIZE + TSS_REDIRECTION_SIZE;
2308 r = kvm_write_guest_page(kvm, fn++, &data,
2309 TSS_IOPB_BASE_OFFSET, sizeof(u16));
2310 if (r < 0)
2311 goto out;
2312 r = kvm_clear_guest_page(kvm, fn++, 0, PAGE_SIZE);
2313 if (r < 0)
2314 goto out;
2315 r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE);
2316 if (r < 0)
2317 goto out;
2318 data = ~0;
2319 r = kvm_write_guest_page(kvm, fn, &data,
2320 RMODE_TSS_SIZE - 2 * PAGE_SIZE - 1,
2321 sizeof(u8));
2322 if (r < 0)
2323 goto out;
2324
2325 ret = 1;
2326out:
2327 return ret;
2328}
2329
2330static int init_rmode_identity_map(struct kvm *kvm)
2331{
2332 int i, r, ret;
2333 pfn_t identity_map_pfn;
2334 u32 tmp;
2335
2336 if (!enable_ept)
2337 return 1;
2338 if (unlikely(!kvm->arch.ept_identity_pagetable)) {
2339 printk(KERN_ERR "EPT: identity-mapping pagetable "
2340 "haven't been allocated!\n");
2341 return 0;
2342 }
2343 if (likely(kvm->arch.ept_identity_pagetable_done))
2344 return 1;
2345 ret = 0;
2346 identity_map_pfn = kvm->arch.ept_identity_map_addr >> PAGE_SHIFT;
2347 r = kvm_clear_guest_page(kvm, identity_map_pfn, 0, PAGE_SIZE);
2348 if (r < 0)
2349 goto out;
2350 /* Set up identity-mapping pagetable for EPT in real mode */
2351 for (i = 0; i < PT32_ENT_PER_PAGE; i++) {
2352 tmp = (i << 22) + (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |
2353 _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_PSE);
2354 r = kvm_write_guest_page(kvm, identity_map_pfn,
2355 &tmp, i * sizeof(tmp), sizeof(tmp));
2356 if (r < 0)
2357 goto out;
2358 }
2359 kvm->arch.ept_identity_pagetable_done = true;
2360 ret = 1;
2361out:
2362 return ret;
2363}
2364
2365static void seg_setup(int seg)
2366{
2367 struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
2368 unsigned int ar;
2369
2370 vmcs_write16(sf->selector, 0);
2371 vmcs_writel(sf->base, 0);
2372 vmcs_write32(sf->limit, 0xffff);
2373 if (enable_unrestricted_guest) {
2374 ar = 0x93;
2375 if (seg == VCPU_SREG_CS)
2376 ar |= 0x08; /* code segment */
2377 } else
2378 ar = 0xf3;
2379
2380 vmcs_write32(sf->ar_bytes, ar);
2381}
2382
2383static int alloc_apic_access_page(struct kvm *kvm)
2384{
2385 struct kvm_userspace_memory_region kvm_userspace_mem;
2386 int r = 0;
2387
2388 mutex_lock(&kvm->slots_lock);
2389 if (kvm->arch.apic_access_page)
2390 goto out;
2391 kvm_userspace_mem.slot = APIC_ACCESS_PAGE_PRIVATE_MEMSLOT;
2392 kvm_userspace_mem.flags = 0;
2393 kvm_userspace_mem.guest_phys_addr = 0xfee00000ULL;
2394 kvm_userspace_mem.memory_size = PAGE_SIZE;
2395 r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0);
2396 if (r)
2397 goto out;
2398
2399 kvm->arch.apic_access_page = gfn_to_page(kvm, 0xfee00);
2400out:
2401 mutex_unlock(&kvm->slots_lock);
2402 return r;
2403}
2404
2405static int alloc_identity_pagetable(struct kvm *kvm)
2406{
2407 struct kvm_userspace_memory_region kvm_userspace_mem;
2408 int r = 0;
2409
2410 mutex_lock(&kvm->slots_lock);
2411 if (kvm->arch.ept_identity_pagetable)
2412 goto out;
2413 kvm_userspace_mem.slot = IDENTITY_PAGETABLE_PRIVATE_MEMSLOT;
2414 kvm_userspace_mem.flags = 0;
2415 kvm_userspace_mem.guest_phys_addr =
2416 kvm->arch.ept_identity_map_addr;
2417 kvm_userspace_mem.memory_size = PAGE_SIZE;
2418 r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0);
2419 if (r)
2420 goto out;
2421
2422 kvm->arch.ept_identity_pagetable = gfn_to_page(kvm,
2423 kvm->arch.ept_identity_map_addr >> PAGE_SHIFT);
2424out:
2425 mutex_unlock(&kvm->slots_lock);
2426 return r;
2427}
2428
2429static void allocate_vpid(struct vcpu_vmx *vmx)
2430{
2431 int vpid;
2432
2433 vmx->vpid = 0;
2434 if (!enable_vpid)
2435 return;
2436 spin_lock(&vmx_vpid_lock);
2437 vpid = find_first_zero_bit(vmx_vpid_bitmap, VMX_NR_VPIDS);
2438 if (vpid < VMX_NR_VPIDS) {
2439 vmx->vpid = vpid;
2440 __set_bit(vpid, vmx_vpid_bitmap);
2441 }
2442 spin_unlock(&vmx_vpid_lock);
2443}
2444
2445static void free_vpid(struct vcpu_vmx *vmx)
2446{
2447 if (!enable_vpid)
2448 return;
2449 spin_lock(&vmx_vpid_lock);
2450 if (vmx->vpid != 0)
2451 __clear_bit(vmx->vpid, vmx_vpid_bitmap);
2452 spin_unlock(&vmx_vpid_lock);
2453}
2454
2455static void __vmx_disable_intercept_for_msr(unsigned long *msr_bitmap, u32 msr)
2456{
2457 int f = sizeof(unsigned long);
2458
2459 if (!cpu_has_vmx_msr_bitmap())
2460 return;
2461
2462 /*
2463 * See Intel PRM Vol. 3, 20.6.9 (MSR-Bitmap Address). Early manuals
2464 * have the write-low and read-high bitmap offsets the wrong way round.
2465 * We can control MSRs 0x00000000-0x00001fff and 0xc0000000-0xc0001fff.
2466 */
2467 if (msr <= 0x1fff) {
2468 __clear_bit(msr, msr_bitmap + 0x000 / f); /* read-low */
2469 __clear_bit(msr, msr_bitmap + 0x800 / f); /* write-low */
2470 } else if ((msr >= 0xc0000000) && (msr <= 0xc0001fff)) {
2471 msr &= 0x1fff;
2472 __clear_bit(msr, msr_bitmap + 0x400 / f); /* read-high */
2473 __clear_bit(msr, msr_bitmap + 0xc00 / f); /* write-high */
2474 }
2475}
2476
2477static void vmx_disable_intercept_for_msr(u32 msr, bool longmode_only)
2478{
2479 if (!longmode_only)
2480 __vmx_disable_intercept_for_msr(vmx_msr_bitmap_legacy, msr);
2481 __vmx_disable_intercept_for_msr(vmx_msr_bitmap_longmode, msr);
2482}
2483
2484/*
2485 * Sets up the vmcs for emulated real mode.
2486 */
2487static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
2488{
2489 u32 host_sysenter_cs, msr_low, msr_high;
2490 u32 junk;
2491 u64 host_pat;
2492 unsigned long a;
2493 struct desc_ptr dt;
2494 int i;
2495 unsigned long kvm_vmx_return;
2496 u32 exec_control;
2497
2498 /* I/O */
2499 vmcs_write64(IO_BITMAP_A, __pa(vmx_io_bitmap_a));
2500 vmcs_write64(IO_BITMAP_B, __pa(vmx_io_bitmap_b));
2501
2502 if (cpu_has_vmx_msr_bitmap())
2503 vmcs_write64(MSR_BITMAP, __pa(vmx_msr_bitmap_legacy));
2504
2505 vmcs_write64(VMCS_LINK_POINTER, -1ull); /* 22.3.1.5 */
2506
2507 /* Control */
2508 vmcs_write32(PIN_BASED_VM_EXEC_CONTROL,
2509 vmcs_config.pin_based_exec_ctrl);
2510
2511 exec_control = vmcs_config.cpu_based_exec_ctrl;
2512 if (!vm_need_tpr_shadow(vmx->vcpu.kvm)) {
2513 exec_control &= ~CPU_BASED_TPR_SHADOW;
2514#ifdef CONFIG_X86_64
2515 exec_control |= CPU_BASED_CR8_STORE_EXITING |
2516 CPU_BASED_CR8_LOAD_EXITING;
2517#endif
2518 }
2519 if (!enable_ept)
2520 exec_control |= CPU_BASED_CR3_STORE_EXITING |
2521 CPU_BASED_CR3_LOAD_EXITING |
2522 CPU_BASED_INVLPG_EXITING;
2523 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, exec_control);
2524
2525 if (cpu_has_secondary_exec_ctrls()) {
2526 exec_control = vmcs_config.cpu_based_2nd_exec_ctrl;
2527 if (!vm_need_virtualize_apic_accesses(vmx->vcpu.kvm))
2528 exec_control &=
2529 ~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
2530 if (vmx->vpid == 0)
2531 exec_control &= ~SECONDARY_EXEC_ENABLE_VPID;
2532 if (!enable_ept) {
2533 exec_control &= ~SECONDARY_EXEC_ENABLE_EPT;
2534 enable_unrestricted_guest = 0;
2535 }
2536 if (!enable_unrestricted_guest)
2537 exec_control &= ~SECONDARY_EXEC_UNRESTRICTED_GUEST;
2538 if (!ple_gap)
2539 exec_control &= ~SECONDARY_EXEC_PAUSE_LOOP_EXITING;
2540 vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control);
2541 }
2542
2543 if (ple_gap) {
2544 vmcs_write32(PLE_GAP, ple_gap);
2545 vmcs_write32(PLE_WINDOW, ple_window);
2546 }
2547
2548 vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, !!bypass_guest_pf);
2549 vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, !!bypass_guest_pf);
2550 vmcs_write32(CR3_TARGET_COUNT, 0); /* 22.2.1 */
2551
2552 vmcs_writel(HOST_CR0, read_cr0() | X86_CR0_TS); /* 22.2.3 */
2553 vmcs_writel(HOST_CR4, read_cr4()); /* 22.2.3, 22.2.5 */
2554 vmcs_writel(HOST_CR3, read_cr3()); /* 22.2.3 FIXME: shadow tables */
2555
2556 vmcs_write16(HOST_CS_SELECTOR, __KERNEL_CS); /* 22.2.4 */
2557 vmcs_write16(HOST_DS_SELECTOR, __KERNEL_DS); /* 22.2.4 */
2558 vmcs_write16(HOST_ES_SELECTOR, __KERNEL_DS); /* 22.2.4 */
2559 vmcs_write16(HOST_FS_SELECTOR, 0); /* 22.2.4 */
2560 vmcs_write16(HOST_GS_SELECTOR, 0); /* 22.2.4 */
2561 vmcs_write16(HOST_SS_SELECTOR, __KERNEL_DS); /* 22.2.4 */
2562#ifdef CONFIG_X86_64
2563 rdmsrl(MSR_FS_BASE, a);
2564 vmcs_writel(HOST_FS_BASE, a); /* 22.2.4 */
2565 rdmsrl(MSR_GS_BASE, a);
2566 vmcs_writel(HOST_GS_BASE, a); /* 22.2.4 */
2567#else
2568 vmcs_writel(HOST_FS_BASE, 0); /* 22.2.4 */
2569 vmcs_writel(HOST_GS_BASE, 0); /* 22.2.4 */
2570#endif
2571
2572 vmcs_write16(HOST_TR_SELECTOR, GDT_ENTRY_TSS*8); /* 22.2.4 */
2573
2574 native_store_idt(&dt);
2575 vmcs_writel(HOST_IDTR_BASE, dt.address); /* 22.2.4 */
2576
2577 asm("mov $.Lkvm_vmx_return, %0" : "=r"(kvm_vmx_return));
2578 vmcs_writel(HOST_RIP, kvm_vmx_return); /* 22.2.5 */
2579 vmcs_write32(VM_EXIT_MSR_STORE_COUNT, 0);
2580 vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, 0);
2581 vmcs_write64(VM_EXIT_MSR_LOAD_ADDR, __pa(vmx->msr_autoload.host));
2582 vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, 0);
2583 vmcs_write64(VM_ENTRY_MSR_LOAD_ADDR, __pa(vmx->msr_autoload.guest));
2584
2585 rdmsr(MSR_IA32_SYSENTER_CS, host_sysenter_cs, junk);
2586 vmcs_write32(HOST_IA32_SYSENTER_CS, host_sysenter_cs);
2587 rdmsrl(MSR_IA32_SYSENTER_ESP, a);
2588 vmcs_writel(HOST_IA32_SYSENTER_ESP, a); /* 22.2.3 */
2589 rdmsrl(MSR_IA32_SYSENTER_EIP, a);
2590 vmcs_writel(HOST_IA32_SYSENTER_EIP, a); /* 22.2.3 */
2591
2592 if (vmcs_config.vmexit_ctrl & VM_EXIT_LOAD_IA32_PAT) {
2593 rdmsr(MSR_IA32_CR_PAT, msr_low, msr_high);
2594 host_pat = msr_low | ((u64) msr_high << 32);
2595 vmcs_write64(HOST_IA32_PAT, host_pat);
2596 }
2597 if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) {
2598 rdmsr(MSR_IA32_CR_PAT, msr_low, msr_high);
2599 host_pat = msr_low | ((u64) msr_high << 32);
2600 /* Write the default value follow host pat */
2601 vmcs_write64(GUEST_IA32_PAT, host_pat);
2602 /* Keep arch.pat sync with GUEST_IA32_PAT */
2603 vmx->vcpu.arch.pat = host_pat;
2604 }
2605
2606 for (i = 0; i < NR_VMX_MSR; ++i) {
2607 u32 index = vmx_msr_index[i];
2608 u32 data_low, data_high;
2609 int j = vmx->nmsrs;
2610
2611 if (rdmsr_safe(index, &data_low, &data_high) < 0)
2612 continue;
2613 if (wrmsr_safe(index, data_low, data_high) < 0)
2614 continue;
2615 vmx->guest_msrs[j].index = i;
2616 vmx->guest_msrs[j].data = 0;
2617 vmx->guest_msrs[j].mask = -1ull;
2618 ++vmx->nmsrs;
2619 }
2620
2621 vmcs_write32(VM_EXIT_CONTROLS, vmcs_config.vmexit_ctrl);
2622
2623 /* 22.2.1, 20.8.1 */
2624 vmcs_write32(VM_ENTRY_CONTROLS, vmcs_config.vmentry_ctrl);
2625
2626 vmcs_writel(CR0_GUEST_HOST_MASK, ~0UL);
2627 vmx->vcpu.arch.cr4_guest_owned_bits = KVM_CR4_GUEST_OWNED_BITS;
2628 if (enable_ept)
2629 vmx->vcpu.arch.cr4_guest_owned_bits |= X86_CR4_PGE;
2630 vmcs_writel(CR4_GUEST_HOST_MASK, ~vmx->vcpu.arch.cr4_guest_owned_bits);
2631
2632 kvm_write_tsc(&vmx->vcpu, 0);
2633
2634 return 0;
2635}
2636
2637static int init_rmode(struct kvm *kvm)
2638{
2639 int idx, ret = 0;
2640
2641 idx = srcu_read_lock(&kvm->srcu);
2642 if (!init_rmode_tss(kvm))
2643 goto exit;
2644 if (!init_rmode_identity_map(kvm))
2645 goto exit;
2646
2647 ret = 1;
2648exit:
2649 srcu_read_unlock(&kvm->srcu, idx);
2650 return ret;
2651}
2652
2653static int vmx_vcpu_reset(struct kvm_vcpu *vcpu)
2654{
2655 struct vcpu_vmx *vmx = to_vmx(vcpu);
2656 u64 msr;
2657 int ret;
2658
2659 vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP));
2660 if (!init_rmode(vmx->vcpu.kvm)) {
2661 ret = -ENOMEM;
2662 goto out;
2663 }
2664
2665 vmx->rmode.vm86_active = 0;
2666
2667 vmx->soft_vnmi_blocked = 0;
2668
2669 vmx->vcpu.arch.regs[VCPU_REGS_RDX] = get_rdx_init_val();
2670 kvm_set_cr8(&vmx->vcpu, 0);
2671 msr = 0xfee00000 | MSR_IA32_APICBASE_ENABLE;
2672 if (kvm_vcpu_is_bsp(&vmx->vcpu))
2673 msr |= MSR_IA32_APICBASE_BSP;
2674 kvm_set_apic_base(&vmx->vcpu, msr);
2675
2676 ret = fx_init(&vmx->vcpu);
2677 if (ret != 0)
2678 goto out;
2679
2680 seg_setup(VCPU_SREG_CS);
2681 /*
2682 * GUEST_CS_BASE should really be 0xffff0000, but VT vm86 mode
2683 * insists on having GUEST_CS_BASE == GUEST_CS_SELECTOR << 4. Sigh.
2684 */
2685 if (kvm_vcpu_is_bsp(&vmx->vcpu)) {
2686 vmcs_write16(GUEST_CS_SELECTOR, 0xf000);
2687 vmcs_writel(GUEST_CS_BASE, 0x000f0000);
2688 } else {
2689 vmcs_write16(GUEST_CS_SELECTOR, vmx->vcpu.arch.sipi_vector << 8);
2690 vmcs_writel(GUEST_CS_BASE, vmx->vcpu.arch.sipi_vector << 12);
2691 }
2692
2693 seg_setup(VCPU_SREG_DS);
2694 seg_setup(VCPU_SREG_ES);
2695 seg_setup(VCPU_SREG_FS);
2696 seg_setup(VCPU_SREG_GS);
2697 seg_setup(VCPU_SREG_SS);
2698
2699 vmcs_write16(GUEST_TR_SELECTOR, 0);
2700 vmcs_writel(GUEST_TR_BASE, 0);
2701 vmcs_write32(GUEST_TR_LIMIT, 0xffff);
2702 vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);
2703
2704 vmcs_write16(GUEST_LDTR_SELECTOR, 0);
2705 vmcs_writel(GUEST_LDTR_BASE, 0);
2706 vmcs_write32(GUEST_LDTR_LIMIT, 0xffff);
2707 vmcs_write32(GUEST_LDTR_AR_BYTES, 0x00082);
2708
2709 vmcs_write32(GUEST_SYSENTER_CS, 0);
2710 vmcs_writel(GUEST_SYSENTER_ESP, 0);
2711 vmcs_writel(GUEST_SYSENTER_EIP, 0);
2712
2713 vmcs_writel(GUEST_RFLAGS, 0x02);
2714 if (kvm_vcpu_is_bsp(&vmx->vcpu))
2715 kvm_rip_write(vcpu, 0xfff0);
2716 else
2717 kvm_rip_write(vcpu, 0);
2718 kvm_register_write(vcpu, VCPU_REGS_RSP, 0);
2719
2720 vmcs_writel(GUEST_DR7, 0x400);
2721
2722 vmcs_writel(GUEST_GDTR_BASE, 0);
2723 vmcs_write32(GUEST_GDTR_LIMIT, 0xffff);
2724
2725 vmcs_writel(GUEST_IDTR_BASE, 0);
2726 vmcs_write32(GUEST_IDTR_LIMIT, 0xffff);
2727
2728 vmcs_write32(GUEST_ACTIVITY_STATE, 0);
2729 vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, 0);
2730 vmcs_write32(GUEST_PENDING_DBG_EXCEPTIONS, 0);
2731
2732 /* Special registers */
2733 vmcs_write64(GUEST_IA32_DEBUGCTL, 0);
2734
2735 setup_msrs(vmx);
2736
2737 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0); /* 22.2.1 */
2738
2739 if (cpu_has_vmx_tpr_shadow()) {
2740 vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, 0);
2741 if (vm_need_tpr_shadow(vmx->vcpu.kvm))
2742 vmcs_write64(VIRTUAL_APIC_PAGE_ADDR,
2743 page_to_phys(vmx->vcpu.arch.apic->regs_page));
2744 vmcs_write32(TPR_THRESHOLD, 0);
2745 }
2746
2747 if (vm_need_virtualize_apic_accesses(vmx->vcpu.kvm))
2748 vmcs_write64(APIC_ACCESS_ADDR,
2749 page_to_phys(vmx->vcpu.kvm->arch.apic_access_page));
2750
2751 if (vmx->vpid != 0)
2752 vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->vpid);
2753
2754 vmx->vcpu.arch.cr0 = X86_CR0_NW | X86_CR0_CD | X86_CR0_ET;
2755 vmx_set_cr0(&vmx->vcpu, kvm_read_cr0(vcpu)); /* enter rmode */
2756 vmx_set_cr4(&vmx->vcpu, 0);
2757 vmx_set_efer(&vmx->vcpu, 0);
2758 vmx_fpu_activate(&vmx->vcpu);
2759 update_exception_bitmap(&vmx->vcpu);
2760
2761 vpid_sync_context(vmx);
2762
2763 ret = 0;
2764
2765 /* HACK: Don't enable emulation on guest boot/reset */
2766 vmx->emulation_required = 0;
2767
2768out:
2769 return ret;
2770}
2771
2772static void enable_irq_window(struct kvm_vcpu *vcpu)
2773{
2774 u32 cpu_based_vm_exec_control;
2775
2776 cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
2777 cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_INTR_PENDING;
2778 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
2779}
2780
2781static void enable_nmi_window(struct kvm_vcpu *vcpu)
2782{
2783 u32 cpu_based_vm_exec_control;
2784
2785 if (!cpu_has_virtual_nmis()) {
2786 enable_irq_window(vcpu);
2787 return;
2788 }
2789
2790 cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
2791 cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_NMI_PENDING;
2792 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
2793}
2794
2795static void vmx_inject_irq(struct kvm_vcpu *vcpu)
2796{
2797 struct vcpu_vmx *vmx = to_vmx(vcpu);
2798 uint32_t intr;
2799 int irq = vcpu->arch.interrupt.nr;
2800
2801 trace_kvm_inj_virq(irq);
2802
2803 ++vcpu->stat.irq_injections;
2804 if (vmx->rmode.vm86_active) {
2805 if (kvm_inject_realmode_interrupt(vcpu, irq) != EMULATE_DONE)
2806 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
2807 return;
2808 }
2809 intr = irq | INTR_INFO_VALID_MASK;
2810 if (vcpu->arch.interrupt.soft) {
2811 intr |= INTR_TYPE_SOFT_INTR;
2812 vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
2813 vmx->vcpu.arch.event_exit_inst_len);
2814 } else
2815 intr |= INTR_TYPE_EXT_INTR;
2816 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr);
2817}
2818
2819static void vmx_inject_nmi(struct kvm_vcpu *vcpu)
2820{
2821 struct vcpu_vmx *vmx = to_vmx(vcpu);
2822
2823 if (!cpu_has_virtual_nmis()) {
2824 /*
2825 * Tracking the NMI-blocked state in software is built upon
2826 * finding the next open IRQ window. This, in turn, depends on
2827 * well-behaving guests: They have to keep IRQs disabled at
2828 * least as long as the NMI handler runs. Otherwise we may
2829 * cause NMI nesting, maybe breaking the guest. But as this is
2830 * highly unlikely, we can live with the residual risk.
2831 */
2832 vmx->soft_vnmi_blocked = 1;
2833 vmx->vnmi_blocked_time = 0;
2834 }
2835
2836 ++vcpu->stat.nmi_injections;
2837 if (vmx->rmode.vm86_active) {
2838 if (kvm_inject_realmode_interrupt(vcpu, NMI_VECTOR) != EMULATE_DONE)
2839 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
2840 return;
2841 }
2842 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
2843 INTR_TYPE_NMI_INTR | INTR_INFO_VALID_MASK | NMI_VECTOR);
2844}
2845
2846static int vmx_nmi_allowed(struct kvm_vcpu *vcpu)
2847{
2848 if (!cpu_has_virtual_nmis() && to_vmx(vcpu)->soft_vnmi_blocked)
2849 return 0;
2850
2851 return !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) &
2852 (GUEST_INTR_STATE_MOV_SS | GUEST_INTR_STATE_NMI));
2853}
2854
2855static bool vmx_get_nmi_mask(struct kvm_vcpu *vcpu)
2856{
2857 if (!cpu_has_virtual_nmis())
2858 return to_vmx(vcpu)->soft_vnmi_blocked;
2859 return vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & GUEST_INTR_STATE_NMI;
2860}
2861
2862static void vmx_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked)
2863{
2864 struct vcpu_vmx *vmx = to_vmx(vcpu);
2865
2866 if (!cpu_has_virtual_nmis()) {
2867 if (vmx->soft_vnmi_blocked != masked) {
2868 vmx->soft_vnmi_blocked = masked;
2869 vmx->vnmi_blocked_time = 0;
2870 }
2871 } else {
2872 if (masked)
2873 vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
2874 GUEST_INTR_STATE_NMI);
2875 else
2876 vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO,
2877 GUEST_INTR_STATE_NMI);
2878 }
2879}
2880
2881static int vmx_interrupt_allowed(struct kvm_vcpu *vcpu)
2882{
2883 return (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) &&
2884 !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) &
2885 (GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS));
2886}
2887
2888static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr)
2889{
2890 int ret;
2891 struct kvm_userspace_memory_region tss_mem = {
2892 .slot = TSS_PRIVATE_MEMSLOT,
2893 .guest_phys_addr = addr,
2894 .memory_size = PAGE_SIZE * 3,
2895 .flags = 0,
2896 };
2897
2898 ret = kvm_set_memory_region(kvm, &tss_mem, 0);
2899 if (ret)
2900 return ret;
2901 kvm->arch.tss_addr = addr;
2902 return 0;
2903}
2904
2905static int handle_rmode_exception(struct kvm_vcpu *vcpu,
2906 int vec, u32 err_code)
2907{
2908 /*
2909 * Instruction with address size override prefix opcode 0x67
2910 * Cause the #SS fault with 0 error code in VM86 mode.
2911 */
2912 if (((vec == GP_VECTOR) || (vec == SS_VECTOR)) && err_code == 0)
2913 if (emulate_instruction(vcpu, 0, 0, 0) == EMULATE_DONE)
2914 return 1;
2915 /*
2916 * Forward all other exceptions that are valid in real mode.
2917 * FIXME: Breaks guest debugging in real mode, needs to be fixed with
2918 * the required debugging infrastructure rework.
2919 */
2920 switch (vec) {
2921 case DB_VECTOR:
2922 if (vcpu->guest_debug &
2923 (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))
2924 return 0;
2925 kvm_queue_exception(vcpu, vec);
2926 return 1;
2927 case BP_VECTOR:
2928 /*
2929 * Update instruction length as we may reinject the exception
2930 * from user space while in guest debugging mode.
2931 */
2932 to_vmx(vcpu)->vcpu.arch.event_exit_inst_len =
2933 vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
2934 if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
2935 return 0;
2936 /* fall through */
2937 case DE_VECTOR:
2938 case OF_VECTOR:
2939 case BR_VECTOR:
2940 case UD_VECTOR:
2941 case DF_VECTOR:
2942 case SS_VECTOR:
2943 case GP_VECTOR:
2944 case MF_VECTOR:
2945 kvm_queue_exception(vcpu, vec);
2946 return 1;
2947 }
2948 return 0;
2949}
2950
2951/*
2952 * Trigger machine check on the host. We assume all the MSRs are already set up
2953 * by the CPU and that we still run on the same CPU as the MCE occurred on.
2954 * We pass a fake environment to the machine check handler because we want
2955 * the guest to be always treated like user space, no matter what context
2956 * it used internally.
2957 */
2958static void kvm_machine_check(void)
2959{
2960#if defined(CONFIG_X86_MCE) && defined(CONFIG_X86_64)
2961 struct pt_regs regs = {
2962 .cs = 3, /* Fake ring 3 no matter what the guest ran on */
2963 .flags = X86_EFLAGS_IF,
2964 };
2965
2966 do_machine_check(&regs, 0);
2967#endif
2968}
2969
2970static int handle_machine_check(struct kvm_vcpu *vcpu)
2971{
2972 /* already handled by vcpu_run */
2973 return 1;
2974}
2975
2976static int handle_exception(struct kvm_vcpu *vcpu)
2977{
2978 struct vcpu_vmx *vmx = to_vmx(vcpu);
2979 struct kvm_run *kvm_run = vcpu->run;
2980 u32 intr_info, ex_no, error_code;
2981 unsigned long cr2, rip, dr6;
2982 u32 vect_info;
2983 enum emulation_result er;
2984
2985 vect_info = vmx->idt_vectoring_info;
2986 intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
2987
2988 if (is_machine_check(intr_info))
2989 return handle_machine_check(vcpu);
2990
2991 if ((vect_info & VECTORING_INFO_VALID_MASK) &&
2992 !is_page_fault(intr_info)) {
2993 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
2994 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_SIMUL_EX;
2995 vcpu->run->internal.ndata = 2;
2996 vcpu->run->internal.data[0] = vect_info;
2997 vcpu->run->internal.data[1] = intr_info;
2998 return 0;
2999 }
3000
3001 if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR)
3002 return 1; /* already handled by vmx_vcpu_run() */
3003
3004 if (is_no_device(intr_info)) {
3005 vmx_fpu_activate(vcpu);
3006 return 1;
3007 }
3008
3009 if (is_invalid_opcode(intr_info)) {
3010 er = emulate_instruction(vcpu, 0, 0, EMULTYPE_TRAP_UD);
3011 if (er != EMULATE_DONE)
3012 kvm_queue_exception(vcpu, UD_VECTOR);
3013 return 1;
3014 }
3015
3016 error_code = 0;
3017 rip = kvm_rip_read(vcpu);
3018 if (intr_info & INTR_INFO_DELIVER_CODE_MASK)
3019 error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE);
3020 if (is_page_fault(intr_info)) {
3021 /* EPT won't cause page fault directly */
3022 if (enable_ept)
3023 BUG();
3024 cr2 = vmcs_readl(EXIT_QUALIFICATION);
3025 trace_kvm_page_fault(cr2, error_code);
3026
3027 if (kvm_event_needs_reinjection(vcpu))
3028 kvm_mmu_unprotect_page_virt(vcpu, cr2);
3029 return kvm_mmu_page_fault(vcpu, cr2, error_code);
3030 }
3031
3032 if (vmx->rmode.vm86_active &&
3033 handle_rmode_exception(vcpu, intr_info & INTR_INFO_VECTOR_MASK,
3034 error_code)) {
3035 if (vcpu->arch.halt_request) {
3036 vcpu->arch.halt_request = 0;
3037 return kvm_emulate_halt(vcpu);
3038 }
3039 return 1;
3040 }
3041
3042 ex_no = intr_info & INTR_INFO_VECTOR_MASK;
3043 switch (ex_no) {
3044 case DB_VECTOR:
3045 dr6 = vmcs_readl(EXIT_QUALIFICATION);
3046 if (!(vcpu->guest_debug &
3047 (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))) {
3048 vcpu->arch.dr6 = dr6 | DR6_FIXED_1;
3049 kvm_queue_exception(vcpu, DB_VECTOR);
3050 return 1;
3051 }
3052 kvm_run->debug.arch.dr6 = dr6 | DR6_FIXED_1;
3053 kvm_run->debug.arch.dr7 = vmcs_readl(GUEST_DR7);
3054 /* fall through */
3055 case BP_VECTOR:
3056 /*
3057 * Update instruction length as we may reinject #BP from
3058 * user space while in guest debugging mode. Reading it for
3059 * #DB as well causes no harm, it is not used in that case.
3060 */
3061 vmx->vcpu.arch.event_exit_inst_len =
3062 vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
3063 kvm_run->exit_reason = KVM_EXIT_DEBUG;
3064 kvm_run->debug.arch.pc = vmcs_readl(GUEST_CS_BASE) + rip;
3065 kvm_run->debug.arch.exception = ex_no;
3066 break;
3067 default:
3068 kvm_run->exit_reason = KVM_EXIT_EXCEPTION;
3069 kvm_run->ex.exception = ex_no;
3070 kvm_run->ex.error_code = error_code;
3071 break;
3072 }
3073 return 0;
3074}
3075
3076static int handle_external_interrupt(struct kvm_vcpu *vcpu)
3077{
3078 ++vcpu->stat.irq_exits;
3079 return 1;
3080}
3081
3082static int handle_triple_fault(struct kvm_vcpu *vcpu)
3083{
3084 vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN;
3085 return 0;
3086}
3087
3088static int handle_io(struct kvm_vcpu *vcpu)
3089{
3090 unsigned long exit_qualification;
3091 int size, in, string;
3092 unsigned port;
3093
3094 exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
3095 string = (exit_qualification & 16) != 0;
3096 in = (exit_qualification & 8) != 0;
3097
3098 ++vcpu->stat.io_exits;
3099
3100 if (string || in)
3101 return emulate_instruction(vcpu, 0, 0, 0) == EMULATE_DONE;
3102
3103 port = exit_qualification >> 16;
3104 size = (exit_qualification & 7) + 1;
3105 skip_emulated_instruction(vcpu);
3106
3107 return kvm_fast_pio_out(vcpu, size, port);
3108}
3109
3110static void
3111vmx_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall)
3112{
3113 /*
3114 * Patch in the VMCALL instruction:
3115 */
3116 hypercall[0] = 0x0f;
3117 hypercall[1] = 0x01;
3118 hypercall[2] = 0xc1;
3119}
3120
3121static void complete_insn_gp(struct kvm_vcpu *vcpu, int err)
3122{
3123 if (err)
3124 kvm_inject_gp(vcpu, 0);
3125 else
3126 skip_emulated_instruction(vcpu);
3127}
3128
3129static int handle_cr(struct kvm_vcpu *vcpu)
3130{
3131 unsigned long exit_qualification, val;
3132 int cr;
3133 int reg;
3134 int err;
3135
3136 exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
3137 cr = exit_qualification & 15;
3138 reg = (exit_qualification >> 8) & 15;
3139 switch ((exit_qualification >> 4) & 3) {
3140 case 0: /* mov to cr */
3141 val = kvm_register_read(vcpu, reg);
3142 trace_kvm_cr_write(cr, val);
3143 switch (cr) {
3144 case 0:
3145 err = kvm_set_cr0(vcpu, val);
3146 complete_insn_gp(vcpu, err);
3147 return 1;
3148 case 3:
3149 err = kvm_set_cr3(vcpu, val);
3150 complete_insn_gp(vcpu, err);
3151 return 1;
3152 case 4:
3153 err = kvm_set_cr4(vcpu, val);
3154 complete_insn_gp(vcpu, err);
3155 return 1;
3156 case 8: {
3157 u8 cr8_prev = kvm_get_cr8(vcpu);
3158 u8 cr8 = kvm_register_read(vcpu, reg);
3159 kvm_set_cr8(vcpu, cr8);
3160 skip_emulated_instruction(vcpu);
3161 if (irqchip_in_kernel(vcpu->kvm))
3162 return 1;
3163 if (cr8_prev <= cr8)
3164 return 1;
3165 vcpu->run->exit_reason = KVM_EXIT_SET_TPR;
3166 return 0;
3167 }
3168 };
3169 break;
3170 case 2: /* clts */
3171 vmx_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~X86_CR0_TS));
3172 trace_kvm_cr_write(0, kvm_read_cr0(vcpu));
3173 skip_emulated_instruction(vcpu);
3174 vmx_fpu_activate(vcpu);
3175 return 1;
3176 case 1: /*mov from cr*/
3177 switch (cr) {
3178 case 3:
3179 kvm_register_write(vcpu, reg, vcpu->arch.cr3);
3180 trace_kvm_cr_read(cr, vcpu->arch.cr3);
3181 skip_emulated_instruction(vcpu);
3182 return 1;
3183 case 8:
3184 val = kvm_get_cr8(vcpu);
3185 kvm_register_write(vcpu, reg, val);
3186 trace_kvm_cr_read(cr, val);
3187 skip_emulated_instruction(vcpu);
3188 return 1;
3189 }
3190 break;
3191 case 3: /* lmsw */
3192 val = (exit_qualification >> LMSW_SOURCE_DATA_SHIFT) & 0x0f;
3193 trace_kvm_cr_write(0, (kvm_read_cr0(vcpu) & ~0xful) | val);
3194 kvm_lmsw(vcpu, val);
3195
3196 skip_emulated_instruction(vcpu);
3197 return 1;
3198 default:
3199 break;
3200 }
3201 vcpu->run->exit_reason = 0;
3202 pr_unimpl(vcpu, "unhandled control register: op %d cr %d\n",
3203 (int)(exit_qualification >> 4) & 3, cr);
3204 return 0;
3205}
3206
3207static int handle_dr(struct kvm_vcpu *vcpu)
3208{
3209 unsigned long exit_qualification;
3210 int dr, reg;
3211
3212 /* Do not handle if the CPL > 0, will trigger GP on re-entry */
3213 if (!kvm_require_cpl(vcpu, 0))
3214 return 1;
3215 dr = vmcs_readl(GUEST_DR7);
3216 if (dr & DR7_GD) {
3217 /*
3218 * As the vm-exit takes precedence over the debug trap, we
3219 * need to emulate the latter, either for the host or the
3220 * guest debugging itself.
3221 */
3222 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) {
3223 vcpu->run->debug.arch.dr6 = vcpu->arch.dr6;
3224 vcpu->run->debug.arch.dr7 = dr;
3225 vcpu->run->debug.arch.pc =
3226 vmcs_readl(GUEST_CS_BASE) +
3227 vmcs_readl(GUEST_RIP);
3228 vcpu->run->debug.arch.exception = DB_VECTOR;
3229 vcpu->run->exit_reason = KVM_EXIT_DEBUG;
3230 return 0;
3231 } else {
3232 vcpu->arch.dr7 &= ~DR7_GD;
3233 vcpu->arch.dr6 |= DR6_BD;
3234 vmcs_writel(GUEST_DR7, vcpu->arch.dr7);
3235 kvm_queue_exception(vcpu, DB_VECTOR);
3236 return 1;
3237 }
3238 }
3239
3240 exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
3241 dr = exit_qualification & DEBUG_REG_ACCESS_NUM;
3242 reg = DEBUG_REG_ACCESS_REG(exit_qualification);
3243 if (exit_qualification & TYPE_MOV_FROM_DR) {
3244 unsigned long val;
3245 if (!kvm_get_dr(vcpu, dr, &val))
3246 kvm_register_write(vcpu, reg, val);
3247 } else
3248 kvm_set_dr(vcpu, dr, vcpu->arch.regs[reg]);
3249 skip_emulated_instruction(vcpu);
3250 return 1;
3251}
3252
3253static void vmx_set_dr7(struct kvm_vcpu *vcpu, unsigned long val)
3254{
3255 vmcs_writel(GUEST_DR7, val);
3256}
3257
3258static int handle_cpuid(struct kvm_vcpu *vcpu)
3259{
3260 kvm_emulate_cpuid(vcpu);
3261 return 1;
3262}
3263
3264static int handle_rdmsr(struct kvm_vcpu *vcpu)
3265{
3266 u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX];
3267 u64 data;
3268
3269 if (vmx_get_msr(vcpu, ecx, &data)) {
3270 trace_kvm_msr_read_ex(ecx);
3271 kvm_inject_gp(vcpu, 0);
3272 return 1;
3273 }
3274
3275 trace_kvm_msr_read(ecx, data);
3276
3277 /* FIXME: handling of bits 32:63 of rax, rdx */
3278 vcpu->arch.regs[VCPU_REGS_RAX] = data & -1u;
3279 vcpu->arch.regs[VCPU_REGS_RDX] = (data >> 32) & -1u;
3280 skip_emulated_instruction(vcpu);
3281 return 1;
3282}
3283
3284static int handle_wrmsr(struct kvm_vcpu *vcpu)
3285{
3286 u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX];
3287 u64 data = (vcpu->arch.regs[VCPU_REGS_RAX] & -1u)
3288 | ((u64)(vcpu->arch.regs[VCPU_REGS_RDX] & -1u) << 32);
3289
3290 if (vmx_set_msr(vcpu, ecx, data) != 0) {
3291 trace_kvm_msr_write_ex(ecx, data);
3292 kvm_inject_gp(vcpu, 0);
3293 return 1;
3294 }
3295
3296 trace_kvm_msr_write(ecx, data);
3297 skip_emulated_instruction(vcpu);
3298 return 1;
3299}
3300
3301static int handle_tpr_below_threshold(struct kvm_vcpu *vcpu)
3302{
3303 kvm_make_request(KVM_REQ_EVENT, vcpu);
3304 return 1;
3305}
3306
3307static int handle_interrupt_window(struct kvm_vcpu *vcpu)
3308{
3309 u32 cpu_based_vm_exec_control;
3310
3311 /* clear pending irq */
3312 cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
3313 cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING;
3314 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
3315
3316 kvm_make_request(KVM_REQ_EVENT, vcpu);
3317
3318 ++vcpu->stat.irq_window_exits;
3319
3320 /*
3321 * If the user space waits to inject interrupts, exit as soon as
3322 * possible
3323 */
3324 if (!irqchip_in_kernel(vcpu->kvm) &&
3325 vcpu->run->request_interrupt_window &&
3326 !kvm_cpu_has_interrupt(vcpu)) {
3327 vcpu->run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN;
3328 return 0;
3329 }
3330 return 1;
3331}
3332
3333static int handle_halt(struct kvm_vcpu *vcpu)
3334{
3335 skip_emulated_instruction(vcpu);
3336 return kvm_emulate_halt(vcpu);
3337}
3338
3339static int handle_vmcall(struct kvm_vcpu *vcpu)
3340{
3341 skip_emulated_instruction(vcpu);
3342 kvm_emulate_hypercall(vcpu);
3343 return 1;
3344}
3345
3346static int handle_vmx_insn(struct kvm_vcpu *vcpu)
3347{
3348 kvm_queue_exception(vcpu, UD_VECTOR);
3349 return 1;
3350}
3351
3352static int handle_invd(struct kvm_vcpu *vcpu)
3353{
3354 return emulate_instruction(vcpu, 0, 0, 0) == EMULATE_DONE;
3355}
3356
3357static int handle_invlpg(struct kvm_vcpu *vcpu)
3358{
3359 unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
3360
3361 kvm_mmu_invlpg(vcpu, exit_qualification);
3362 skip_emulated_instruction(vcpu);
3363 return 1;
3364}
3365
3366static int handle_wbinvd(struct kvm_vcpu *vcpu)
3367{
3368 skip_emulated_instruction(vcpu);
3369 kvm_emulate_wbinvd(vcpu);
3370 return 1;
3371}
3372
3373static int handle_xsetbv(struct kvm_vcpu *vcpu)
3374{
3375 u64 new_bv = kvm_read_edx_eax(vcpu);
3376 u32 index = kvm_register_read(vcpu, VCPU_REGS_RCX);
3377
3378 if (kvm_set_xcr(vcpu, index, new_bv) == 0)
3379 skip_emulated_instruction(vcpu);
3380 return 1;
3381}
3382
3383static int handle_apic_access(struct kvm_vcpu *vcpu)
3384{
3385 return emulate_instruction(vcpu, 0, 0, 0) == EMULATE_DONE;
3386}
3387
3388static int handle_task_switch(struct kvm_vcpu *vcpu)
3389{
3390 struct vcpu_vmx *vmx = to_vmx(vcpu);
3391 unsigned long exit_qualification;
3392 bool has_error_code = false;
3393 u32 error_code = 0;
3394 u16 tss_selector;
3395 int reason, type, idt_v;
3396
3397 idt_v = (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK);
3398 type = (vmx->idt_vectoring_info & VECTORING_INFO_TYPE_MASK);
3399
3400 exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
3401
3402 reason = (u32)exit_qualification >> 30;
3403 if (reason == TASK_SWITCH_GATE && idt_v) {
3404 switch (type) {
3405 case INTR_TYPE_NMI_INTR:
3406 vcpu->arch.nmi_injected = false;
3407 if (cpu_has_virtual_nmis())
3408 vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
3409 GUEST_INTR_STATE_NMI);
3410 break;
3411 case INTR_TYPE_EXT_INTR:
3412 case INTR_TYPE_SOFT_INTR:
3413 kvm_clear_interrupt_queue(vcpu);
3414 break;
3415 case INTR_TYPE_HARD_EXCEPTION:
3416 if (vmx->idt_vectoring_info &
3417 VECTORING_INFO_DELIVER_CODE_MASK) {
3418 has_error_code = true;
3419 error_code =
3420 vmcs_read32(IDT_VECTORING_ERROR_CODE);
3421 }
3422 /* fall through */
3423 case INTR_TYPE_SOFT_EXCEPTION:
3424 kvm_clear_exception_queue(vcpu);
3425 break;
3426 default:
3427 break;
3428 }
3429 }
3430 tss_selector = exit_qualification;
3431
3432 if (!idt_v || (type != INTR_TYPE_HARD_EXCEPTION &&
3433 type != INTR_TYPE_EXT_INTR &&
3434 type != INTR_TYPE_NMI_INTR))
3435 skip_emulated_instruction(vcpu);
3436
3437 if (kvm_task_switch(vcpu, tss_selector, reason,
3438 has_error_code, error_code) == EMULATE_FAIL) {
3439 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
3440 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
3441 vcpu->run->internal.ndata = 0;
3442 return 0;
3443 }
3444
3445 /* clear all local breakpoint enable flags */
3446 vmcs_writel(GUEST_DR7, vmcs_readl(GUEST_DR7) & ~55);
3447
3448 /*
3449 * TODO: What about debug traps on tss switch?
3450 * Are we supposed to inject them and update dr6?
3451 */
3452
3453 return 1;
3454}
3455
3456static int handle_ept_violation(struct kvm_vcpu *vcpu)
3457{
3458 unsigned long exit_qualification;
3459 gpa_t gpa;
3460 int gla_validity;
3461
3462 exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
3463
3464 if (exit_qualification & (1 << 6)) {
3465 printk(KERN_ERR "EPT: GPA exceeds GAW!\n");
3466 return -EINVAL;
3467 }
3468
3469 gla_validity = (exit_qualification >> 7) & 0x3;
3470 if (gla_validity != 0x3 && gla_validity != 0x1 && gla_validity != 0) {
3471 printk(KERN_ERR "EPT: Handling EPT violation failed!\n");
3472 printk(KERN_ERR "EPT: GPA: 0x%lx, GVA: 0x%lx\n",
3473 (long unsigned int)vmcs_read64(GUEST_PHYSICAL_ADDRESS),
3474 vmcs_readl(GUEST_LINEAR_ADDRESS));
3475 printk(KERN_ERR "EPT: Exit qualification is 0x%lx\n",
3476 (long unsigned int)exit_qualification);
3477 vcpu->run->exit_reason = KVM_EXIT_UNKNOWN;
3478 vcpu->run->hw.hardware_exit_reason = EXIT_REASON_EPT_VIOLATION;
3479 return 0;
3480 }
3481
3482 gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);
3483 trace_kvm_page_fault(gpa, exit_qualification);
3484 return kvm_mmu_page_fault(vcpu, gpa, exit_qualification & 0x3);
3485}
3486
3487static u64 ept_rsvd_mask(u64 spte, int level)
3488{
3489 int i;
3490 u64 mask = 0;
3491
3492 for (i = 51; i > boot_cpu_data.x86_phys_bits; i--)
3493 mask |= (1ULL << i);
3494
3495 if (level > 2)
3496 /* bits 7:3 reserved */
3497 mask |= 0xf8;
3498 else if (level == 2) {
3499 if (spte & (1ULL << 7))
3500 /* 2MB ref, bits 20:12 reserved */
3501 mask |= 0x1ff000;
3502 else
3503 /* bits 6:3 reserved */
3504 mask |= 0x78;
3505 }
3506
3507 return mask;
3508}
3509
3510static void ept_misconfig_inspect_spte(struct kvm_vcpu *vcpu, u64 spte,
3511 int level)
3512{
3513 printk(KERN_ERR "%s: spte 0x%llx level %d\n", __func__, spte, level);
3514
3515 /* 010b (write-only) */
3516 WARN_ON((spte & 0x7) == 0x2);
3517
3518 /* 110b (write/execute) */
3519 WARN_ON((spte & 0x7) == 0x6);
3520
3521 /* 100b (execute-only) and value not supported by logical processor */
3522 if (!cpu_has_vmx_ept_execute_only())
3523 WARN_ON((spte & 0x7) == 0x4);
3524
3525 /* not 000b */
3526 if ((spte & 0x7)) {
3527 u64 rsvd_bits = spte & ept_rsvd_mask(spte, level);
3528
3529 if (rsvd_bits != 0) {
3530 printk(KERN_ERR "%s: rsvd_bits = 0x%llx\n",
3531 __func__, rsvd_bits);
3532 WARN_ON(1);
3533 }
3534
3535 if (level == 1 || (level == 2 && (spte & (1ULL << 7)))) {
3536 u64 ept_mem_type = (spte & 0x38) >> 3;
3537
3538 if (ept_mem_type == 2 || ept_mem_type == 3 ||
3539 ept_mem_type == 7) {
3540 printk(KERN_ERR "%s: ept_mem_type=0x%llx\n",
3541 __func__, ept_mem_type);
3542 WARN_ON(1);
3543 }
3544 }
3545 }
3546}
3547
3548static int handle_ept_misconfig(struct kvm_vcpu *vcpu)
3549{
3550 u64 sptes[4];
3551 int nr_sptes, i;
3552 gpa_t gpa;
3553
3554 gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);
3555
3556 printk(KERN_ERR "EPT: Misconfiguration.\n");
3557 printk(KERN_ERR "EPT: GPA: 0x%llx\n", gpa);
3558
3559 nr_sptes = kvm_mmu_get_spte_hierarchy(vcpu, gpa, sptes);
3560
3561 for (i = PT64_ROOT_LEVEL; i > PT64_ROOT_LEVEL - nr_sptes; --i)
3562 ept_misconfig_inspect_spte(vcpu, sptes[i-1], i);
3563
3564 vcpu->run->exit_reason = KVM_EXIT_UNKNOWN;
3565 vcpu->run->hw.hardware_exit_reason = EXIT_REASON_EPT_MISCONFIG;
3566
3567 return 0;
3568}
3569
3570static int handle_nmi_window(struct kvm_vcpu *vcpu)
3571{
3572 u32 cpu_based_vm_exec_control;
3573
3574 /* clear pending NMI */
3575 cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
3576 cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_NMI_PENDING;
3577 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
3578 ++vcpu->stat.nmi_window_exits;
3579 kvm_make_request(KVM_REQ_EVENT, vcpu);
3580
3581 return 1;
3582}
3583
3584static int handle_invalid_guest_state(struct kvm_vcpu *vcpu)
3585{
3586 struct vcpu_vmx *vmx = to_vmx(vcpu);
3587 enum emulation_result err = EMULATE_DONE;
3588 int ret = 1;
3589 u32 cpu_exec_ctrl;
3590 bool intr_window_requested;
3591
3592 cpu_exec_ctrl = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
3593 intr_window_requested = cpu_exec_ctrl & CPU_BASED_VIRTUAL_INTR_PENDING;
3594
3595 while (!guest_state_valid(vcpu)) {
3596 if (intr_window_requested
3597 && (kvm_get_rflags(&vmx->vcpu) & X86_EFLAGS_IF))
3598 return handle_interrupt_window(&vmx->vcpu);
3599
3600 err = emulate_instruction(vcpu, 0, 0, 0);
3601
3602 if (err == EMULATE_DO_MMIO) {
3603 ret = 0;
3604 goto out;
3605 }
3606
3607 if (err != EMULATE_DONE)
3608 return 0;
3609
3610 if (signal_pending(current))
3611 goto out;
3612 if (need_resched())
3613 schedule();
3614 }
3615
3616 vmx->emulation_required = 0;
3617out:
3618 return ret;
3619}
3620
3621/*
3622 * Indicate a busy-waiting vcpu in spinlock. We do not enable the PAUSE
3623 * exiting, so only get here on cpu with PAUSE-Loop-Exiting.
3624 */
3625static int handle_pause(struct kvm_vcpu *vcpu)
3626{
3627 skip_emulated_instruction(vcpu);
3628 kvm_vcpu_on_spin(vcpu);
3629
3630 return 1;
3631}
3632
3633static int handle_invalid_op(struct kvm_vcpu *vcpu)
3634{
3635 kvm_queue_exception(vcpu, UD_VECTOR);
3636 return 1;
3637}
3638
3639/*
3640 * The exit handlers return 1 if the exit was handled fully and guest execution
3641 * may resume. Otherwise they set the kvm_run parameter to indicate what needs
3642 * to be done to userspace and return 0.
3643 */
3644static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu) = {
3645 [EXIT_REASON_EXCEPTION_NMI] = handle_exception,
3646 [EXIT_REASON_EXTERNAL_INTERRUPT] = handle_external_interrupt,
3647 [EXIT_REASON_TRIPLE_FAULT] = handle_triple_fault,
3648 [EXIT_REASON_NMI_WINDOW] = handle_nmi_window,
3649 [EXIT_REASON_IO_INSTRUCTION] = handle_io,
3650 [EXIT_REASON_CR_ACCESS] = handle_cr,
3651 [EXIT_REASON_DR_ACCESS] = handle_dr,
3652 [EXIT_REASON_CPUID] = handle_cpuid,
3653 [EXIT_REASON_MSR_READ] = handle_rdmsr,
3654 [EXIT_REASON_MSR_WRITE] = handle_wrmsr,
3655 [EXIT_REASON_PENDING_INTERRUPT] = handle_interrupt_window,
3656 [EXIT_REASON_HLT] = handle_halt,
3657 [EXIT_REASON_INVD] = handle_invd,
3658 [EXIT_REASON_INVLPG] = handle_invlpg,
3659 [EXIT_REASON_VMCALL] = handle_vmcall,
3660 [EXIT_REASON_VMCLEAR] = handle_vmx_insn,
3661 [EXIT_REASON_VMLAUNCH] = handle_vmx_insn,
3662 [EXIT_REASON_VMPTRLD] = handle_vmx_insn,
3663 [EXIT_REASON_VMPTRST] = handle_vmx_insn,
3664 [EXIT_REASON_VMREAD] = handle_vmx_insn,
3665 [EXIT_REASON_VMRESUME] = handle_vmx_insn,
3666 [EXIT_REASON_VMWRITE] = handle_vmx_insn,
3667 [EXIT_REASON_VMOFF] = handle_vmx_insn,
3668 [EXIT_REASON_VMON] = handle_vmx_insn,
3669 [EXIT_REASON_TPR_BELOW_THRESHOLD] = handle_tpr_below_threshold,
3670 [EXIT_REASON_APIC_ACCESS] = handle_apic_access,
3671 [EXIT_REASON_WBINVD] = handle_wbinvd,
3672 [EXIT_REASON_XSETBV] = handle_xsetbv,
3673 [EXIT_REASON_TASK_SWITCH] = handle_task_switch,
3674 [EXIT_REASON_MCE_DURING_VMENTRY] = handle_machine_check,
3675 [EXIT_REASON_EPT_VIOLATION] = handle_ept_violation,
3676 [EXIT_REASON_EPT_MISCONFIG] = handle_ept_misconfig,
3677 [EXIT_REASON_PAUSE_INSTRUCTION] = handle_pause,
3678 [EXIT_REASON_MWAIT_INSTRUCTION] = handle_invalid_op,
3679 [EXIT_REASON_MONITOR_INSTRUCTION] = handle_invalid_op,
3680};
3681
3682static const int kvm_vmx_max_exit_handlers =
3683 ARRAY_SIZE(kvm_vmx_exit_handlers);
3684
3685/*
3686 * The guest has exited. See if we can fix it or if we need userspace
3687 * assistance.
3688 */
3689static int vmx_handle_exit(struct kvm_vcpu *vcpu)
3690{
3691 struct vcpu_vmx *vmx = to_vmx(vcpu);
3692 u32 exit_reason = vmx->exit_reason;
3693 u32 vectoring_info = vmx->idt_vectoring_info;
3694
3695 trace_kvm_exit(exit_reason, vcpu);
3696
3697 /* If guest state is invalid, start emulating */
3698 if (vmx->emulation_required && emulate_invalid_guest_state)
3699 return handle_invalid_guest_state(vcpu);
3700
3701 /* Access CR3 don't cause VMExit in paging mode, so we need
3702 * to sync with guest real CR3. */
3703 if (enable_ept && is_paging(vcpu))
3704 vcpu->arch.cr3 = vmcs_readl(GUEST_CR3);
3705
3706 if (exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY) {
3707 vcpu->run->exit_reason = KVM_EXIT_FAIL_ENTRY;
3708 vcpu->run->fail_entry.hardware_entry_failure_reason
3709 = exit_reason;
3710 return 0;
3711 }
3712
3713 if (unlikely(vmx->fail)) {
3714 vcpu->run->exit_reason = KVM_EXIT_FAIL_ENTRY;
3715 vcpu->run->fail_entry.hardware_entry_failure_reason
3716 = vmcs_read32(VM_INSTRUCTION_ERROR);
3717 return 0;
3718 }
3719
3720 if ((vectoring_info & VECTORING_INFO_VALID_MASK) &&
3721 (exit_reason != EXIT_REASON_EXCEPTION_NMI &&
3722 exit_reason != EXIT_REASON_EPT_VIOLATION &&
3723 exit_reason != EXIT_REASON_TASK_SWITCH))
3724 printk(KERN_WARNING "%s: unexpected, valid vectoring info "
3725 "(0x%x) and exit reason is 0x%x\n",
3726 __func__, vectoring_info, exit_reason);
3727
3728 if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked)) {
3729 if (vmx_interrupt_allowed(vcpu)) {
3730 vmx->soft_vnmi_blocked = 0;
3731 } else if (vmx->vnmi_blocked_time > 1000000000LL &&
3732 vcpu->arch.nmi_pending) {
3733 /*
3734 * This CPU don't support us in finding the end of an
3735 * NMI-blocked window if the guest runs with IRQs
3736 * disabled. So we pull the trigger after 1 s of
3737 * futile waiting, but inform the user about this.
3738 */
3739 printk(KERN_WARNING "%s: Breaking out of NMI-blocked "
3740 "state on VCPU %d after 1 s timeout\n",
3741 __func__, vcpu->vcpu_id);
3742 vmx->soft_vnmi_blocked = 0;
3743 }
3744 }
3745
3746 if (exit_reason < kvm_vmx_max_exit_handlers
3747 && kvm_vmx_exit_handlers[exit_reason])
3748 return kvm_vmx_exit_handlers[exit_reason](vcpu);
3749 else {
3750 vcpu->run->exit_reason = KVM_EXIT_UNKNOWN;
3751 vcpu->run->hw.hardware_exit_reason = exit_reason;
3752 }
3753 return 0;
3754}
3755
3756static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr)
3757{
3758 if (irr == -1 || tpr < irr) {
3759 vmcs_write32(TPR_THRESHOLD, 0);
3760 return;
3761 }
3762
3763 vmcs_write32(TPR_THRESHOLD, irr);
3764}
3765
3766static void vmx_complete_atomic_exit(struct vcpu_vmx *vmx)
3767{
3768 u32 exit_intr_info = vmx->exit_intr_info;
3769
3770 /* Handle machine checks before interrupts are enabled */
3771 if ((vmx->exit_reason == EXIT_REASON_MCE_DURING_VMENTRY)
3772 || (vmx->exit_reason == EXIT_REASON_EXCEPTION_NMI
3773 && is_machine_check(exit_intr_info)))
3774 kvm_machine_check();
3775
3776 /* We need to handle NMIs before interrupts are enabled */
3777 if ((exit_intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR &&
3778 (exit_intr_info & INTR_INFO_VALID_MASK)) {
3779 kvm_before_handle_nmi(&vmx->vcpu);
3780 asm("int $2");
3781 kvm_after_handle_nmi(&vmx->vcpu);
3782 }
3783}
3784
3785static void vmx_recover_nmi_blocking(struct vcpu_vmx *vmx)
3786{
3787 u32 exit_intr_info = vmx->exit_intr_info;
3788 bool unblock_nmi;
3789 u8 vector;
3790 bool idtv_info_valid;
3791
3792 idtv_info_valid = vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK;
3793
3794 if (cpu_has_virtual_nmis()) {
3795 unblock_nmi = (exit_intr_info & INTR_INFO_UNBLOCK_NMI) != 0;
3796 vector = exit_intr_info & INTR_INFO_VECTOR_MASK;
3797 /*
3798 * SDM 3: 27.7.1.2 (September 2008)
3799 * Re-set bit "block by NMI" before VM entry if vmexit caused by
3800 * a guest IRET fault.
3801 * SDM 3: 23.2.2 (September 2008)
3802 * Bit 12 is undefined in any of the following cases:
3803 * If the VM exit sets the valid bit in the IDT-vectoring
3804 * information field.
3805 * If the VM exit is due to a double fault.
3806 */
3807 if ((exit_intr_info & INTR_INFO_VALID_MASK) && unblock_nmi &&
3808 vector != DF_VECTOR && !idtv_info_valid)
3809 vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
3810 GUEST_INTR_STATE_NMI);
3811 } else if (unlikely(vmx->soft_vnmi_blocked))
3812 vmx->vnmi_blocked_time +=
3813 ktime_to_ns(ktime_sub(ktime_get(), vmx->entry_time));
3814}
3815
3816static void __vmx_complete_interrupts(struct vcpu_vmx *vmx,
3817 u32 idt_vectoring_info,
3818 int instr_len_field,
3819 int error_code_field)
3820{
3821 u8 vector;
3822 int type;
3823 bool idtv_info_valid;
3824
3825 idtv_info_valid = idt_vectoring_info & VECTORING_INFO_VALID_MASK;
3826
3827 vmx->vcpu.arch.nmi_injected = false;
3828 kvm_clear_exception_queue(&vmx->vcpu);
3829 kvm_clear_interrupt_queue(&vmx->vcpu);
3830
3831 if (!idtv_info_valid)
3832 return;
3833
3834 kvm_make_request(KVM_REQ_EVENT, &vmx->vcpu);
3835
3836 vector = idt_vectoring_info & VECTORING_INFO_VECTOR_MASK;
3837 type = idt_vectoring_info & VECTORING_INFO_TYPE_MASK;
3838
3839 switch (type) {
3840 case INTR_TYPE_NMI_INTR:
3841 vmx->vcpu.arch.nmi_injected = true;
3842 /*
3843 * SDM 3: 27.7.1.2 (September 2008)
3844 * Clear bit "block by NMI" before VM entry if a NMI
3845 * delivery faulted.
3846 */
3847 vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO,
3848 GUEST_INTR_STATE_NMI);
3849 break;
3850 case INTR_TYPE_SOFT_EXCEPTION:
3851 vmx->vcpu.arch.event_exit_inst_len =
3852 vmcs_read32(instr_len_field);
3853 /* fall through */
3854 case INTR_TYPE_HARD_EXCEPTION:
3855 if (idt_vectoring_info & VECTORING_INFO_DELIVER_CODE_MASK) {
3856 u32 err = vmcs_read32(error_code_field);
3857 kvm_queue_exception_e(&vmx->vcpu, vector, err);
3858 } else
3859 kvm_queue_exception(&vmx->vcpu, vector);
3860 break;
3861 case INTR_TYPE_SOFT_INTR:
3862 vmx->vcpu.arch.event_exit_inst_len =
3863 vmcs_read32(instr_len_field);
3864 /* fall through */
3865 case INTR_TYPE_EXT_INTR:
3866 kvm_queue_interrupt(&vmx->vcpu, vector,
3867 type == INTR_TYPE_SOFT_INTR);
3868 break;
3869 default:
3870 break;
3871 }
3872}
3873
3874static void vmx_complete_interrupts(struct vcpu_vmx *vmx)
3875{
3876 __vmx_complete_interrupts(vmx, vmx->idt_vectoring_info,
3877 VM_EXIT_INSTRUCTION_LEN,
3878 IDT_VECTORING_ERROR_CODE);
3879}
3880
3881static void vmx_cancel_injection(struct kvm_vcpu *vcpu)
3882{
3883 __vmx_complete_interrupts(to_vmx(vcpu),
3884 vmcs_read32(VM_ENTRY_INTR_INFO_FIELD),
3885 VM_ENTRY_INSTRUCTION_LEN,
3886 VM_ENTRY_EXCEPTION_ERROR_CODE);
3887
3888 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0);
3889}
3890
3891#ifdef CONFIG_X86_64
3892#define R "r"
3893#define Q "q"
3894#else
3895#define R "e"
3896#define Q "l"
3897#endif
3898
3899/*
3900 * We put this into a separate noinline function to prevent the compiler
3901 * from duplicating the code. This is needed because this code
3902 * uses non local labels that cannot be duplicated.
3903 * Do not put any flow control into this function.
3904 * Better would be to put this whole monstrosity into a .S file.
3905 */
3906static void noinline do_vmx_vcpu_run(struct kvm_vcpu *vcpu)
3907{
3908 struct vcpu_vmx *vmx = to_vmx(vcpu);
3909 asm volatile(
3910 /* Store host registers */
3911 "push %%"R"dx; push %%"R"bp;"
3912 "push %%"R"cx \n\t"
3913 "cmp %%"R"sp, %c[host_rsp](%0) \n\t"
3914 "je 1f \n\t"
3915 "mov %%"R"sp, %c[host_rsp](%0) \n\t"
3916 __ex(ASM_VMX_VMWRITE_RSP_RDX) "\n\t"
3917 "1: \n\t"
3918 /* Reload cr2 if changed */
3919 "mov %c[cr2](%0), %%"R"ax \n\t"
3920 "mov %%cr2, %%"R"dx \n\t"
3921 "cmp %%"R"ax, %%"R"dx \n\t"
3922 "je 2f \n\t"
3923 "mov %%"R"ax, %%cr2 \n\t"
3924 "2: \n\t"
3925 /* Check if vmlaunch of vmresume is needed */
3926 "cmpl $0, %c[launched](%0) \n\t"
3927 /* Load guest registers. Don't clobber flags. */
3928 "mov %c[rax](%0), %%"R"ax \n\t"
3929 "mov %c[rbx](%0), %%"R"bx \n\t"
3930 "mov %c[rdx](%0), %%"R"dx \n\t"
3931 "mov %c[rsi](%0), %%"R"si \n\t"
3932 "mov %c[rdi](%0), %%"R"di \n\t"
3933 "mov %c[rbp](%0), %%"R"bp \n\t"
3934#ifdef CONFIG_X86_64
3935 "mov %c[r8](%0), %%r8 \n\t"
3936 "mov %c[r9](%0), %%r9 \n\t"
3937 "mov %c[r10](%0), %%r10 \n\t"
3938 "mov %c[r11](%0), %%r11 \n\t"
3939 "mov %c[r12](%0), %%r12 \n\t"
3940 "mov %c[r13](%0), %%r13 \n\t"
3941 "mov %c[r14](%0), %%r14 \n\t"
3942 "mov %c[r15](%0), %%r15 \n\t"
3943#endif
3944 "mov %c[rcx](%0), %%"R"cx \n\t" /* kills %0 (ecx) */
3945
3946 /* Enter guest mode */
3947 "jne .Llaunched \n\t"
3948 __ex(ASM_VMX_VMLAUNCH) "\n\t"
3949 "jmp .Lkvm_vmx_return \n\t"
3950 ".Llaunched: " __ex(ASM_VMX_VMRESUME) "\n\t"
3951 ".Lkvm_vmx_return: "
3952 /* Save guest registers, load host registers, keep flags */
3953 "xchg %0, (%%"R"sp) \n\t"
3954 "mov %%"R"ax, %c[rax](%0) \n\t"
3955 "mov %%"R"bx, %c[rbx](%0) \n\t"
3956 "push"Q" (%%"R"sp); pop"Q" %c[rcx](%0) \n\t"
3957 "mov %%"R"dx, %c[rdx](%0) \n\t"
3958 "mov %%"R"si, %c[rsi](%0) \n\t"
3959 "mov %%"R"di, %c[rdi](%0) \n\t"
3960 "mov %%"R"bp, %c[rbp](%0) \n\t"
3961#ifdef CONFIG_X86_64
3962 "mov %%r8, %c[r8](%0) \n\t"
3963 "mov %%r9, %c[r9](%0) \n\t"
3964 "mov %%r10, %c[r10](%0) \n\t"
3965 "mov %%r11, %c[r11](%0) \n\t"
3966 "mov %%r12, %c[r12](%0) \n\t"
3967 "mov %%r13, %c[r13](%0) \n\t"
3968 "mov %%r14, %c[r14](%0) \n\t"
3969 "mov %%r15, %c[r15](%0) \n\t"
3970#endif
3971 "mov %%cr2, %%"R"ax \n\t"
3972 "mov %%"R"ax, %c[cr2](%0) \n\t"
3973
3974 "pop %%"R"bp; pop %%"R"bp; pop %%"R"dx \n\t"
3975 "setbe %c[fail](%0) \n\t"
3976 : : "c"(vmx), "d"((unsigned long)HOST_RSP),
3977 [launched]"i"(offsetof(struct vcpu_vmx, launched)),
3978 [fail]"i"(offsetof(struct vcpu_vmx, fail)),
3979 [host_rsp]"i"(offsetof(struct vcpu_vmx, host_rsp)),
3980 [rax]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RAX])),
3981 [rbx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBX])),
3982 [rcx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RCX])),
3983 [rdx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDX])),
3984 [rsi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RSI])),
3985 [rdi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDI])),
3986 [rbp]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBP])),
3987#ifdef CONFIG_X86_64
3988 [r8]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R8])),
3989 [r9]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R9])),
3990 [r10]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R10])),
3991 [r11]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R11])),
3992 [r12]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R12])),
3993 [r13]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R13])),
3994 [r14]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R14])),
3995 [r15]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R15])),
3996#endif
3997 [cr2]"i"(offsetof(struct vcpu_vmx, vcpu.arch.cr2))
3998 : "cc", "memory"
3999 , R"ax", R"bx", R"di", R"si"
4000#ifdef CONFIG_X86_64
4001 , "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
4002#endif
4003 );
4004}
4005
4006static void vmx_vcpu_run(struct kvm_vcpu *vcpu)
4007{
4008 struct vcpu_vmx *vmx = to_vmx(vcpu);
4009
4010 /* Record the guest's net vcpu time for enforced NMI injections. */
4011 if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked))
4012 vmx->entry_time = ktime_get();
4013
4014 /* Don't enter VMX if guest state is invalid, let the exit handler
4015 start emulation until we arrive back to a valid state */
4016 if (vmx->emulation_required && emulate_invalid_guest_state)
4017 return;
4018
4019 if (test_bit(VCPU_REGS_RSP, (unsigned long *)&vcpu->arch.regs_dirty))
4020 vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]);
4021 if (test_bit(VCPU_REGS_RIP, (unsigned long *)&vcpu->arch.regs_dirty))
4022 vmcs_writel(GUEST_RIP, vcpu->arch.regs[VCPU_REGS_RIP]);
4023
4024 /* When single-stepping over STI and MOV SS, we must clear the
4025 * corresponding interruptibility bits in the guest state. Otherwise
4026 * vmentry fails as it then expects bit 14 (BS) in pending debug
4027 * exceptions being set, but that's not correct for the guest debugging
4028 * case. */
4029 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
4030 vmx_set_interrupt_shadow(vcpu, 0);
4031
4032 do_vmx_vcpu_run(vcpu);
4033
4034 vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP)
4035 | (1 << VCPU_EXREG_PDPTR));
4036 vcpu->arch.regs_dirty = 0;
4037
4038 vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
4039
4040 asm("mov %0, %%ds; mov %0, %%es" : : "r"(__USER_DS));
4041 vmx->launched = 1;
4042
4043 vmx->exit_reason = vmcs_read32(VM_EXIT_REASON);
4044 vmx->exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
4045
4046 vmx_complete_atomic_exit(vmx);
4047 vmx_recover_nmi_blocking(vmx);
4048 vmx_complete_interrupts(vmx);
4049}
4050
4051#undef R
4052#undef Q
4053
4054static void vmx_free_vmcs(struct kvm_vcpu *vcpu)
4055{
4056 struct vcpu_vmx *vmx = to_vmx(vcpu);
4057
4058 if (vmx->vmcs) {
4059 vcpu_clear(vmx);
4060 free_vmcs(vmx->vmcs);
4061 vmx->vmcs = NULL;
4062 }
4063}
4064
4065static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
4066{
4067 struct vcpu_vmx *vmx = to_vmx(vcpu);
4068
4069 free_vpid(vmx);
4070 vmx_free_vmcs(vcpu);
4071 kfree(vmx->guest_msrs);
4072 kvm_vcpu_uninit(vcpu);
4073 kmem_cache_free(kvm_vcpu_cache, vmx);
4074}
4075
4076static inline void vmcs_init(struct vmcs *vmcs)
4077{
4078 u64 phys_addr = __pa(per_cpu(vmxarea, raw_smp_processor_id()));
4079
4080 if (!vmm_exclusive)
4081 kvm_cpu_vmxon(phys_addr);
4082
4083 vmcs_clear(vmcs);
4084
4085 if (!vmm_exclusive)
4086 kvm_cpu_vmxoff();
4087}
4088
4089static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
4090{
4091 int err;
4092 struct vcpu_vmx *vmx = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
4093 int cpu;
4094
4095 if (!vmx)
4096 return ERR_PTR(-ENOMEM);
4097
4098 allocate_vpid(vmx);
4099
4100 err = kvm_vcpu_init(&vmx->vcpu, kvm, id);
4101 if (err)
4102 goto free_vcpu;
4103
4104 vmx->guest_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
4105 if (!vmx->guest_msrs) {
4106 err = -ENOMEM;
4107 goto uninit_vcpu;
4108 }
4109
4110 vmx->vmcs = alloc_vmcs();
4111 if (!vmx->vmcs)
4112 goto free_msrs;
4113
4114 vmcs_init(vmx->vmcs);
4115
4116 cpu = get_cpu();
4117 vmx_vcpu_load(&vmx->vcpu, cpu);
4118 vmx->vcpu.cpu = cpu;
4119 err = vmx_vcpu_setup(vmx);
4120 vmx_vcpu_put(&vmx->vcpu);
4121 put_cpu();
4122 if (err)
4123 goto free_vmcs;
4124 if (vm_need_virtualize_apic_accesses(kvm))
4125 if (alloc_apic_access_page(kvm) != 0)
4126 goto free_vmcs;
4127
4128 if (enable_ept) {
4129 if (!kvm->arch.ept_identity_map_addr)
4130 kvm->arch.ept_identity_map_addr =
4131 VMX_EPT_IDENTITY_PAGETABLE_ADDR;
4132 if (alloc_identity_pagetable(kvm) != 0)
4133 goto free_vmcs;
4134 }
4135
4136 return &vmx->vcpu;
4137
4138free_vmcs:
4139 free_vmcs(vmx->vmcs);
4140free_msrs:
4141 kfree(vmx->guest_msrs);
4142uninit_vcpu:
4143 kvm_vcpu_uninit(&vmx->vcpu);
4144free_vcpu:
4145 free_vpid(vmx);
4146 kmem_cache_free(kvm_vcpu_cache, vmx);
4147 return ERR_PTR(err);
4148}
4149
4150static void __init vmx_check_processor_compat(void *rtn)
4151{
4152 struct vmcs_config vmcs_conf;
4153
4154 *(int *)rtn = 0;
4155 if (setup_vmcs_config(&vmcs_conf) < 0)
4156 *(int *)rtn = -EIO;
4157 if (memcmp(&vmcs_config, &vmcs_conf, sizeof(struct vmcs_config)) != 0) {
4158 printk(KERN_ERR "kvm: CPU %d feature inconsistency!\n",
4159 smp_processor_id());
4160 *(int *)rtn = -EIO;
4161 }
4162}
4163
4164static int get_ept_level(void)
4165{
4166 return VMX_EPT_DEFAULT_GAW + 1;
4167}
4168
4169static u64 vmx_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
4170{
4171 u64 ret;
4172
4173 /* For VT-d and EPT combination
4174 * 1. MMIO: always map as UC
4175 * 2. EPT with VT-d:
4176 * a. VT-d without snooping control feature: can't guarantee the
4177 * result, try to trust guest.
4178 * b. VT-d with snooping control feature: snooping control feature of
4179 * VT-d engine can guarantee the cache correctness. Just set it
4180 * to WB to keep consistent with host. So the same as item 3.
4181 * 3. EPT without VT-d: always map as WB and set IPAT=1 to keep
4182 * consistent with host MTRR
4183 */
4184 if (is_mmio)
4185 ret = MTRR_TYPE_UNCACHABLE << VMX_EPT_MT_EPTE_SHIFT;
4186 else if (vcpu->kvm->arch.iommu_domain &&
4187 !(vcpu->kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY))
4188 ret = kvm_get_guest_memory_type(vcpu, gfn) <<
4189 VMX_EPT_MT_EPTE_SHIFT;
4190 else
4191 ret = (MTRR_TYPE_WRBACK << VMX_EPT_MT_EPTE_SHIFT)
4192 | VMX_EPT_IPAT_BIT;
4193
4194 return ret;
4195}
4196
4197#define _ER(x) { EXIT_REASON_##x, #x }
4198
4199static const struct trace_print_flags vmx_exit_reasons_str[] = {
4200 _ER(EXCEPTION_NMI),
4201 _ER(EXTERNAL_INTERRUPT),
4202 _ER(TRIPLE_FAULT),
4203 _ER(PENDING_INTERRUPT),
4204 _ER(NMI_WINDOW),
4205 _ER(TASK_SWITCH),
4206 _ER(CPUID),
4207 _ER(HLT),
4208 _ER(INVLPG),
4209 _ER(RDPMC),
4210 _ER(RDTSC),
4211 _ER(VMCALL),
4212 _ER(VMCLEAR),
4213 _ER(VMLAUNCH),
4214 _ER(VMPTRLD),
4215 _ER(VMPTRST),
4216 _ER(VMREAD),
4217 _ER(VMRESUME),
4218 _ER(VMWRITE),
4219 _ER(VMOFF),
4220 _ER(VMON),
4221 _ER(CR_ACCESS),
4222 _ER(DR_ACCESS),
4223 _ER(IO_INSTRUCTION),
4224 _ER(MSR_READ),
4225 _ER(MSR_WRITE),
4226 _ER(MWAIT_INSTRUCTION),
4227 _ER(MONITOR_INSTRUCTION),
4228 _ER(PAUSE_INSTRUCTION),
4229 _ER(MCE_DURING_VMENTRY),
4230 _ER(TPR_BELOW_THRESHOLD),
4231 _ER(APIC_ACCESS),
4232 _ER(EPT_VIOLATION),
4233 _ER(EPT_MISCONFIG),
4234 _ER(WBINVD),
4235 { -1, NULL }
4236};
4237
4238#undef _ER
4239
4240static int vmx_get_lpage_level(void)
4241{
4242 if (enable_ept && !cpu_has_vmx_ept_1g_page())
4243 return PT_DIRECTORY_LEVEL;
4244 else
4245 /* For shadow and EPT supported 1GB page */
4246 return PT_PDPE_LEVEL;
4247}
4248
4249static void vmx_cpuid_update(struct kvm_vcpu *vcpu)
4250{
4251 struct kvm_cpuid_entry2 *best;
4252 struct vcpu_vmx *vmx = to_vmx(vcpu);
4253 u32 exec_control;
4254
4255 vmx->rdtscp_enabled = false;
4256 if (vmx_rdtscp_supported()) {
4257 exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL);
4258 if (exec_control & SECONDARY_EXEC_RDTSCP) {
4259 best = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
4260 if (best && (best->edx & bit(X86_FEATURE_RDTSCP)))
4261 vmx->rdtscp_enabled = true;
4262 else {
4263 exec_control &= ~SECONDARY_EXEC_RDTSCP;
4264 vmcs_write32(SECONDARY_VM_EXEC_CONTROL,
4265 exec_control);
4266 }
4267 }
4268 }
4269}
4270
4271static void vmx_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)
4272{
4273}
4274
4275static struct kvm_x86_ops vmx_x86_ops = {
4276 .cpu_has_kvm_support = cpu_has_kvm_support,
4277 .disabled_by_bios = vmx_disabled_by_bios,
4278 .hardware_setup = hardware_setup,
4279 .hardware_unsetup = hardware_unsetup,
4280 .check_processor_compatibility = vmx_check_processor_compat,
4281 .hardware_enable = hardware_enable,
4282 .hardware_disable = hardware_disable,
4283 .cpu_has_accelerated_tpr = report_flexpriority,
4284
4285 .vcpu_create = vmx_create_vcpu,
4286 .vcpu_free = vmx_free_vcpu,
4287 .vcpu_reset = vmx_vcpu_reset,
4288
4289 .prepare_guest_switch = vmx_save_host_state,
4290 .vcpu_load = vmx_vcpu_load,
4291 .vcpu_put = vmx_vcpu_put,
4292
4293 .set_guest_debug = set_guest_debug,
4294 .get_msr = vmx_get_msr,
4295 .set_msr = vmx_set_msr,
4296 .get_segment_base = vmx_get_segment_base,
4297 .get_segment = vmx_get_segment,
4298 .set_segment = vmx_set_segment,
4299 .get_cpl = vmx_get_cpl,
4300 .get_cs_db_l_bits = vmx_get_cs_db_l_bits,
4301 .decache_cr0_guest_bits = vmx_decache_cr0_guest_bits,
4302 .decache_cr4_guest_bits = vmx_decache_cr4_guest_bits,
4303 .set_cr0 = vmx_set_cr0,
4304 .set_cr3 = vmx_set_cr3,
4305 .set_cr4 = vmx_set_cr4,
4306 .set_efer = vmx_set_efer,
4307 .get_idt = vmx_get_idt,
4308 .set_idt = vmx_set_idt,
4309 .get_gdt = vmx_get_gdt,
4310 .set_gdt = vmx_set_gdt,
4311 .set_dr7 = vmx_set_dr7,
4312 .cache_reg = vmx_cache_reg,
4313 .get_rflags = vmx_get_rflags,
4314 .set_rflags = vmx_set_rflags,
4315 .fpu_activate = vmx_fpu_activate,
4316 .fpu_deactivate = vmx_fpu_deactivate,
4317
4318 .tlb_flush = vmx_flush_tlb,
4319
4320 .run = vmx_vcpu_run,
4321 .handle_exit = vmx_handle_exit,
4322 .skip_emulated_instruction = skip_emulated_instruction,
4323 .set_interrupt_shadow = vmx_set_interrupt_shadow,
4324 .get_interrupt_shadow = vmx_get_interrupt_shadow,
4325 .patch_hypercall = vmx_patch_hypercall,
4326 .set_irq = vmx_inject_irq,
4327 .set_nmi = vmx_inject_nmi,
4328 .queue_exception = vmx_queue_exception,
4329 .cancel_injection = vmx_cancel_injection,
4330 .interrupt_allowed = vmx_interrupt_allowed,
4331 .nmi_allowed = vmx_nmi_allowed,
4332 .get_nmi_mask = vmx_get_nmi_mask,
4333 .set_nmi_mask = vmx_set_nmi_mask,
4334 .enable_nmi_window = enable_nmi_window,
4335 .enable_irq_window = enable_irq_window,
4336 .update_cr8_intercept = update_cr8_intercept,
4337
4338 .set_tss_addr = vmx_set_tss_addr,
4339 .get_tdp_level = get_ept_level,
4340 .get_mt_mask = vmx_get_mt_mask,
4341
4342 .exit_reasons_str = vmx_exit_reasons_str,
4343 .get_lpage_level = vmx_get_lpage_level,
4344
4345 .cpuid_update = vmx_cpuid_update,
4346
4347 .rdtscp_supported = vmx_rdtscp_supported,
4348
4349 .set_supported_cpuid = vmx_set_supported_cpuid,
4350
4351 .has_wbinvd_exit = cpu_has_vmx_wbinvd_exit,
4352
4353 .write_tsc_offset = vmx_write_tsc_offset,
4354 .adjust_tsc_offset = vmx_adjust_tsc_offset,
4355
4356 .set_tdp_cr3 = vmx_set_cr3,
4357};
4358
4359static int __init vmx_init(void)
4360{
4361 int r, i;
4362
4363 rdmsrl_safe(MSR_EFER, &host_efer);
4364
4365 for (i = 0; i < NR_VMX_MSR; ++i)
4366 kvm_define_shared_msr(i, vmx_msr_index[i]);
4367
4368 vmx_io_bitmap_a = (unsigned long *)__get_free_page(GFP_KERNEL);
4369 if (!vmx_io_bitmap_a)
4370 return -ENOMEM;
4371
4372 vmx_io_bitmap_b = (unsigned long *)__get_free_page(GFP_KERNEL);
4373 if (!vmx_io_bitmap_b) {
4374 r = -ENOMEM;
4375 goto out;
4376 }
4377
4378 vmx_msr_bitmap_legacy = (unsigned long *)__get_free_page(GFP_KERNEL);
4379 if (!vmx_msr_bitmap_legacy) {
4380 r = -ENOMEM;
4381 goto out1;
4382 }
4383
4384 vmx_msr_bitmap_longmode = (unsigned long *)__get_free_page(GFP_KERNEL);
4385 if (!vmx_msr_bitmap_longmode) {
4386 r = -ENOMEM;
4387 goto out2;
4388 }
4389
4390 /*
4391 * Allow direct access to the PC debug port (it is often used for I/O
4392 * delays, but the vmexits simply slow things down).
4393 */
4394 memset(vmx_io_bitmap_a, 0xff, PAGE_SIZE);
4395 clear_bit(0x80, vmx_io_bitmap_a);
4396
4397 memset(vmx_io_bitmap_b, 0xff, PAGE_SIZE);
4398
4399 memset(vmx_msr_bitmap_legacy, 0xff, PAGE_SIZE);
4400 memset(vmx_msr_bitmap_longmode, 0xff, PAGE_SIZE);
4401
4402 set_bit(0, vmx_vpid_bitmap); /* 0 is reserved for host */
4403
4404 r = kvm_init(&vmx_x86_ops, sizeof(struct vcpu_vmx),
4405 __alignof__(struct vcpu_vmx), THIS_MODULE);
4406 if (r)
4407 goto out3;
4408
4409 vmx_disable_intercept_for_msr(MSR_FS_BASE, false);
4410 vmx_disable_intercept_for_msr(MSR_GS_BASE, false);
4411 vmx_disable_intercept_for_msr(MSR_KERNEL_GS_BASE, true);
4412 vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_CS, false);
4413 vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_ESP, false);
4414 vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_EIP, false);
4415
4416 if (enable_ept) {
4417 bypass_guest_pf = 0;
4418 kvm_mmu_set_mask_ptes(0ull, 0ull, 0ull, 0ull,
4419 VMX_EPT_EXECUTABLE_MASK);
4420 kvm_enable_tdp();
4421 } else
4422 kvm_disable_tdp();
4423
4424 if (bypass_guest_pf)
4425 kvm_mmu_set_nonpresent_ptes(~0xffeull, 0ull);
4426
4427 return 0;
4428
4429out3:
4430 free_page((unsigned long)vmx_msr_bitmap_longmode);
4431out2:
4432 free_page((unsigned long)vmx_msr_bitmap_legacy);
4433out1:
4434 free_page((unsigned long)vmx_io_bitmap_b);
4435out:
4436 free_page((unsigned long)vmx_io_bitmap_a);
4437 return r;
4438}
4439
4440static void __exit vmx_exit(void)
4441{
4442 free_page((unsigned long)vmx_msr_bitmap_legacy);
4443 free_page((unsigned long)vmx_msr_bitmap_longmode);
4444 free_page((unsigned long)vmx_io_bitmap_b);
4445 free_page((unsigned long)vmx_io_bitmap_a);
4446
4447 kvm_exit();
4448}
4449
4450module_init(vmx_init)
4451module_exit(vmx_exit)
Linux 6.x block layer and io_uring tree(s)