* These 2 parameters are used to config the controls for Pause-Loop Exiting:
* ple_gap: upper bound on the amount of time between two successive
* executions of PAUSE in a loop. Also indicate if ple enabled.
- * According to test, this time is usually small than 41 cycles.
+ * According to test, this time is usually smaller than 128 cycles.
* ple_window: upper bound on the amount of time a guest is allowed to execute
* in a PAUSE loop. Tests indicate that most spinlocks are held for
* less than 2^12 cycles
* Time is measured based on a counter that runs at the same rate as the TSC,
* refer SDM volume 3b section 21.6.13 & 22.1.3.
*/
-#define KVM_VMX_DEFAULT_PLE_GAP 41
+#define KVM_VMX_DEFAULT_PLE_GAP 128
#define KVM_VMX_DEFAULT_PLE_WINDOW 4096
static int ple_gap = KVM_VMX_DEFAULT_PLE_GAP;
module_param(ple_gap, int, S_IRUGO);
rdmsrl(MSR_IA32_FEATURE_CONTROL, msr);
if (msr & FEATURE_CONTROL_LOCKED) {
+ /* launched w/ TXT and VMX disabled */
if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX)
&& tboot_enabled())
return 1;
+ /* launched w/o TXT and VMX only enabled w/ TXT */
if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX)
+ && (msr & FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX)
&& !tboot_enabled()) {
printk(KERN_WARNING "kvm: disable TXT in the BIOS or "
- " activate TXT before enabling KVM\n");
+ "activate TXT before enabling KVM\n");
return 1;
}
+ /* launched w/o TXT and VMX disabled */
+ if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX)
+ && !tboot_enabled())
+ return 1;
}
return 0;
- /* locked but not enabled */
}
static void kvm_cpu_vmxon(u64 addr)
vmcs_writel(GUEST_CR4, hw_cr4);
}
-static u64 vmx_get_segment_base(struct kvm_vcpu *vcpu, int seg)
-{
- struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
-
- return vmcs_readl(sf->base);
-}
-
static void vmx_get_segment(struct kvm_vcpu *vcpu,
struct kvm_segment *var, int seg)
{
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
+ struct kvm_save_segment *save;
u32 ar;
+ if (vmx->rmode.vm86_active
+ && (seg == VCPU_SREG_TR || seg == VCPU_SREG_ES
+ || seg == VCPU_SREG_DS || seg == VCPU_SREG_FS
+ || seg == VCPU_SREG_GS)
+ && !emulate_invalid_guest_state) {
+ switch (seg) {
+ case VCPU_SREG_TR: save = &vmx->rmode.tr; break;
+ case VCPU_SREG_ES: save = &vmx->rmode.es; break;
+ case VCPU_SREG_DS: save = &vmx->rmode.ds; break;
+ case VCPU_SREG_FS: save = &vmx->rmode.fs; break;
+ case VCPU_SREG_GS: save = &vmx->rmode.gs; break;
+ default: BUG();
+ }
+ var->selector = save->selector;
+ var->base = save->base;
+ var->limit = save->limit;
+ ar = save->ar;
+ if (seg == VCPU_SREG_TR
+ || var->selector == vmcs_read16(sf->selector))
+ goto use_saved_rmode_seg;
+ }
var->base = vmcs_readl(sf->base);
var->limit = vmcs_read32(sf->limit);
var->selector = vmcs_read16(sf->selector);
ar = vmcs_read32(sf->ar_bytes);
+use_saved_rmode_seg:
if ((ar & AR_UNUSABLE_MASK) && !emulate_invalid_guest_state)
ar = 0;
var->type = ar & 15;
var->unusable = (ar >> 16) & 1;
}
+static u64 vmx_get_segment_base(struct kvm_vcpu *vcpu, int seg)
+{
+ struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
+ struct kvm_segment s;
+
+ if (to_vmx(vcpu)->rmode.vm86_active) {
+ vmx_get_segment(vcpu, &s, seg);
+ return s.base;
+ }
+ return vmcs_readl(sf->base);
+}
+
static int vmx_get_cpl(struct kvm_vcpu *vcpu)
{
if (!is_protmode(vcpu))
asm(
/* Store host registers */
"push %%"R"dx; push %%"R"bp;"
+ "push %%"R"cx \n\t" /* placeholder for guest rcx */
"push %%"R"cx \n\t"
"cmp %%"R"sp, %c[host_rsp](%0) \n\t"
"je 1f \n\t"
".Llaunched: " __ex(ASM_VMX_VMRESUME) "\n\t"
".Lkvm_vmx_return: "
/* Save guest registers, load host registers, keep flags */
- "xchg %0, (%%"R"sp) \n\t"
+ "mov %0, %c[wordsize](%%"R"sp) \n\t"
+ "pop %0 \n\t"
"mov %%"R"ax, %c[rax](%0) \n\t"
"mov %%"R"bx, %c[rbx](%0) \n\t"
- "push"Q" (%%"R"sp); pop"Q" %c[rcx](%0) \n\t"
+ "pop"Q" %c[rcx](%0) \n\t"
"mov %%"R"dx, %c[rdx](%0) \n\t"
"mov %%"R"si, %c[rsi](%0) \n\t"
"mov %%"R"di, %c[rdi](%0) \n\t"
"mov %%cr2, %%"R"ax \n\t"
"mov %%"R"ax, %c[cr2](%0) \n\t"
- "pop %%"R"bp; pop %%"R"bp; pop %%"R"dx \n\t"
+ "pop %%"R"bp; pop %%"R"dx \n\t"
"setbe %c[fail](%0) \n\t"
: : "c"(vmx), "d"((unsigned long)HOST_RSP),
[launched]"i"(offsetof(struct vcpu_vmx, launched)),
[r14]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R14])),
[r15]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R15])),
#endif
- [cr2]"i"(offsetof(struct vcpu_vmx, vcpu.arch.cr2))
+ [cr2]"i"(offsetof(struct vcpu_vmx, vcpu.arch.cr2)),
+ [wordsize]"i"(sizeof(ulong))
: "cc", "memory"
, R"ax", R"bx", R"di", R"si"
#ifdef CONFIG_X86_64
projects / linux-block.git / blobdiff