[linux-2.6-block.git] / arch / mips / kvm / mmu.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * KVM/MIPS MMU handling in the KVM module.
 *
 * Copyright (C) 2012  MIPS Technologies, Inc.  All rights reserved.
 * Authors: Sanjay Lal <sanjayl@kymasys.com>
 */

#include <linux/highmem.h>
#include <linux/kvm_host.h>
#include <asm/mmu_context.h>

static u32 kvm_mips_get_kernel_asid(struct kvm_vcpu *vcpu)
{
	int cpu = smp_processor_id();

	return vcpu->arch.guest_kernel_asid[cpu] &
			cpu_asid_mask(&cpu_data[cpu]);
}

static u32 kvm_mips_get_user_asid(struct kvm_vcpu *vcpu)
{
	int cpu = smp_processor_id();

	return vcpu->arch.guest_user_asid[cpu] &
			cpu_asid_mask(&cpu_data[cpu]);
}

static int kvm_mips_map_page(struct kvm *kvm, gfn_t gfn)
{
	int srcu_idx, err = 0;
	kvm_pfn_t pfn;

	if (kvm->arch.guest_pmap[gfn] != KVM_INVALID_PAGE)
		return 0;

	srcu_idx = srcu_read_lock(&kvm->srcu);
	pfn = gfn_to_pfn(kvm, gfn);

	if (is_error_pfn(pfn)) {
		kvm_err("Couldn't get pfn for gfn %#llx!\n", gfn);
		err = -EFAULT;
		goto out;
	}

	kvm->arch.guest_pmap[gfn] = pfn;
out:
	srcu_read_unlock(&kvm->srcu, srcu_idx);
	return err;
}

/* Translate guest KSEG0 addresses to Host PA */
unsigned long kvm_mips_translate_guest_kseg0_to_hpa(struct kvm_vcpu *vcpu,
						    unsigned long gva)
{
	gfn_t gfn;
	unsigned long offset = gva & ~PAGE_MASK;
	struct kvm *kvm = vcpu->kvm;

	if (KVM_GUEST_KSEGX(gva) != KVM_GUEST_KSEG0) {
		kvm_err("%s/%p: Invalid gva: %#lx\n", __func__,
			__builtin_return_address(0), gva);
		return KVM_INVALID_PAGE;
	}

	gfn = (KVM_GUEST_CPHYSADDR(gva) >> PAGE_SHIFT);

	if (gfn >= kvm->arch.guest_pmap_npages) {
		kvm_err("%s: Invalid gfn: %#llx, GVA: %#lx\n", __func__, gfn,
			gva);
		return KVM_INVALID_PAGE;
	}

	if (kvm_mips_map_page(vcpu->kvm, gfn) < 0)
		return KVM_INVALID_ADDR;

	return (kvm->arch.guest_pmap[gfn] << PAGE_SHIFT) + offset;
}

/* XXXKYMA: Must be called with interrupts disabled */
int kvm_mips_handle_kseg0_tlb_fault(unsigned long badvaddr,
				    struct kvm_vcpu *vcpu)
{
	gfn_t gfn;
	kvm_pfn_t pfn0, pfn1;
	unsigned long vaddr = 0;
	unsigned long entryhi = 0, entrylo0 = 0, entrylo1 = 0;
	struct kvm *kvm = vcpu->kvm;
	const int flush_dcache_mask = 0;
	int ret;

	if (KVM_GUEST_KSEGX(badvaddr) != KVM_GUEST_KSEG0) {
		kvm_err("%s: Invalid BadVaddr: %#lx\n", __func__, badvaddr);
		kvm_mips_dump_host_tlbs();
		return -1;
	}

	gfn = (KVM_GUEST_CPHYSADDR(badvaddr) >> PAGE_SHIFT);
	if (gfn >= kvm->arch.guest_pmap_npages) {
		kvm_err("%s: Invalid gfn: %#llx, BadVaddr: %#lx\n", __func__,
			gfn, badvaddr);
		kvm_mips_dump_host_tlbs();
		return -1;
	}
	vaddr = badvaddr & (PAGE_MASK << 1);

	if (kvm_mips_map_page(vcpu->kvm, gfn) < 0)
		return -1;

	if (kvm_mips_map_page(vcpu->kvm, gfn ^ 0x1) < 0)
		return -1;

	pfn0 = kvm->arch.guest_pmap[gfn & ~0x1];
	pfn1 = kvm->arch.guest_pmap[gfn | 0x1];

	entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) |
		((_page_cachable_default >> _CACHE_SHIFT) << ENTRYLO_C_SHIFT) |
		ENTRYLO_D | ENTRYLO_V;
	entrylo1 = mips3_paddr_to_tlbpfn(pfn1 << PAGE_SHIFT) |
		((_page_cachable_default >> _CACHE_SHIFT) << ENTRYLO_C_SHIFT) |
		ENTRYLO_D | ENTRYLO_V;

	preempt_disable();
	entryhi = (vaddr | kvm_mips_get_kernel_asid(vcpu));
	ret = kvm_mips_host_tlb_write(vcpu, entryhi, entrylo0, entrylo1,
				      flush_dcache_mask);
	preempt_enable();

	return ret;
}

int kvm_mips_handle_mapped_seg_tlb_fault(struct kvm_vcpu *vcpu,
					 struct kvm_mips_tlb *tlb)
{
	unsigned long entryhi = 0, entrylo0 = 0, entrylo1 = 0;
	struct kvm *kvm = vcpu->kvm;
	kvm_pfn_t pfn0, pfn1;
	long tlb_lo[2];
	int ret;

	tlb_lo[0] = tlb->tlb_lo[0];
	tlb_lo[1] = tlb->tlb_lo[1];

	/*
	 * The commpage address must not be mapped to anything else if the guest
	 * TLB contains entries nearby, or commpage accesses will break.
	 */
	if (!((tlb->tlb_hi ^ KVM_GUEST_COMMPAGE_ADDR) &
			VPN2_MASK & (PAGE_MASK << 1)))
		tlb_lo[(KVM_GUEST_COMMPAGE_ADDR >> PAGE_SHIFT) & 1] = 0;

	if (kvm_mips_map_page(kvm, mips3_tlbpfn_to_paddr(tlb_lo[0])
				   >> PAGE_SHIFT) < 0)
		return -1;

	if (kvm_mips_map_page(kvm, mips3_tlbpfn_to_paddr(tlb_lo[1])
				   >> PAGE_SHIFT) < 0)
		return -1;

	pfn0 = kvm->arch.guest_pmap[
		mips3_tlbpfn_to_paddr(tlb_lo[0]) >> PAGE_SHIFT];
	pfn1 = kvm->arch.guest_pmap[
		mips3_tlbpfn_to_paddr(tlb_lo[1]) >> PAGE_SHIFT];

	/* Get attributes from the Guest TLB */
	entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) |
		((_page_cachable_default >> _CACHE_SHIFT) << ENTRYLO_C_SHIFT) |
		(tlb_lo[0] & ENTRYLO_D) |
		(tlb_lo[0] & ENTRYLO_V);
	entrylo1 = mips3_paddr_to_tlbpfn(pfn1 << PAGE_SHIFT) |
		((_page_cachable_default >> _CACHE_SHIFT) << ENTRYLO_C_SHIFT) |
		(tlb_lo[1] & ENTRYLO_D) |
		(tlb_lo[1] & ENTRYLO_V);

	kvm_debug("@ %#lx tlb_lo0: 0x%08lx tlb_lo1: 0x%08lx\n", vcpu->arch.pc,
		  tlb->tlb_lo[0], tlb->tlb_lo[1]);

	preempt_disable();
	entryhi = (tlb->tlb_hi & VPN2_MASK) | (KVM_GUEST_KERNEL_MODE(vcpu) ?
					       kvm_mips_get_kernel_asid(vcpu) :
					       kvm_mips_get_user_asid(vcpu));
	ret = kvm_mips_host_tlb_write(vcpu, entryhi, entrylo0, entrylo1,
				      tlb->tlb_mask);
	preempt_enable();

	return ret;
}

void kvm_get_new_mmu_context(struct mm_struct *mm, unsigned long cpu,
			     struct kvm_vcpu *vcpu)
{
	unsigned long asid = asid_cache(cpu);

	asid += cpu_asid_inc();
	if (!(asid & cpu_asid_mask(&cpu_data[cpu]))) {
		if (cpu_has_vtag_icache)
			flush_icache_all();

		kvm_local_flush_tlb_all();      /* start new asid cycle */

		if (!asid)      /* fix version if needed */
			asid = asid_first_version(cpu);
	}

	cpu_context(cpu, mm) = asid_cache(cpu) = asid;
}

/**
 * kvm_mips_migrate_count() - Migrate timer.
 * @vcpu:	Virtual CPU.
 *
 * Migrate CP0_Count hrtimer to the current CPU by cancelling and restarting it
 * if it was running prior to being cancelled.
 *
 * Must be called when the VCPU is migrated to a different CPU to ensure that
 * timer expiry during guest execution interrupts the guest and causes the
 * interrupt to be delivered in a timely manner.
 */
static void kvm_mips_migrate_count(struct kvm_vcpu *vcpu)
{
	if (hrtimer_cancel(&vcpu->arch.comparecount_timer))
		hrtimer_restart(&vcpu->arch.comparecount_timer);
}

/* Restore ASID once we are scheduled back after preemption */
void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
	unsigned long asid_mask = cpu_asid_mask(&cpu_data[cpu]);
	unsigned long flags;
	int newasid = 0;

	kvm_debug("%s: vcpu %p, cpu: %d\n", __func__, vcpu, cpu);

	/* Allocate new kernel and user ASIDs if needed */

	local_irq_save(flags);

	if ((vcpu->arch.guest_kernel_asid[cpu] ^ asid_cache(cpu)) &
						asid_version_mask(cpu)) {
		kvm_get_new_mmu_context(&vcpu->arch.guest_kernel_mm, cpu, vcpu);
		vcpu->arch.guest_kernel_asid[cpu] =
		    vcpu->arch.guest_kernel_mm.context.asid[cpu];
		kvm_get_new_mmu_context(&vcpu->arch.guest_user_mm, cpu, vcpu);
		vcpu->arch.guest_user_asid[cpu] =
		    vcpu->arch.guest_user_mm.context.asid[cpu];
		newasid++;

		kvm_debug("[%d]: cpu_context: %#lx\n", cpu,
			  cpu_context(cpu, current->mm));
		kvm_debug("[%d]: Allocated new ASID for Guest Kernel: %#x\n",
			  cpu, vcpu->arch.guest_kernel_asid[cpu]);
		kvm_debug("[%d]: Allocated new ASID for Guest User: %#x\n", cpu,
			  vcpu->arch.guest_user_asid[cpu]);
	}

	if (vcpu->arch.last_sched_cpu != cpu) {
		kvm_debug("[%d->%d]KVM VCPU[%d] switch\n",
			  vcpu->arch.last_sched_cpu, cpu, vcpu->vcpu_id);
		/*
		 * Migrate the timer interrupt to the current CPU so that it
		 * always interrupts the guest and synchronously triggers a
		 * guest timer interrupt.
		 */
		kvm_mips_migrate_count(vcpu);
	}

	if (!newasid) {
		/*
		 * If we preempted while the guest was executing, then reload
		 * the pre-empted ASID
		 */
		if (current->flags & PF_VCPU) {
			write_c0_entryhi(vcpu->arch.
					 preempt_entryhi & asid_mask);
			ehb();
		}
	} else {
		/* New ASIDs were allocated for the VM */

		/*
		 * Were we in guest context? If so then the pre-empted ASID is
		 * no longer valid, we need to set it to what it should be based
		 * on the mode of the Guest (Kernel/User)
		 */
		if (current->flags & PF_VCPU) {
			if (KVM_GUEST_KERNEL_MODE(vcpu))
				write_c0_entryhi(vcpu->arch.
						 guest_kernel_asid[cpu] &
						 asid_mask);
			else
				write_c0_entryhi(vcpu->arch.
						 guest_user_asid[cpu] &
						 asid_mask);
			ehb();
		}
	}

	/* restore guest state to registers */
	kvm_mips_callbacks->vcpu_set_regs(vcpu);

	local_irq_restore(flags);

}

/* ASID can change if another task is scheduled during preemption */
void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
{
	unsigned long flags;
	int cpu;

	local_irq_save(flags);

	cpu = smp_processor_id();

	vcpu->arch.preempt_entryhi = read_c0_entryhi();
	vcpu->arch.last_sched_cpu = cpu;

	/* save guest state in registers */
	kvm_mips_callbacks->vcpu_get_regs(vcpu);

	if (((cpu_context(cpu, current->mm) ^ asid_cache(cpu)) &
	     asid_version_mask(cpu))) {
		kvm_debug("%s: Dropping MMU Context:  %#lx\n", __func__,
			  cpu_context(cpu, current->mm));
		drop_mmu_context(current->mm, cpu);
	}
	write_c0_entryhi(cpu_asid(cpu, current->mm));
	ehb();

	local_irq_restore(flags);
}

u32 kvm_get_inst(u32 *opc, struct kvm_vcpu *vcpu)
{
	struct mips_coproc *cop0 = vcpu->arch.cop0;
	unsigned long paddr, flags, vpn2, asid;
	unsigned long va = (unsigned long)opc;
	void *vaddr;
	u32 inst;
	int index;

	if (KVM_GUEST_KSEGX(va) < KVM_GUEST_KSEG0 ||
	    KVM_GUEST_KSEGX(va) == KVM_GUEST_KSEG23) {
		local_irq_save(flags);
		index = kvm_mips_host_tlb_lookup(vcpu, va);
		if (index >= 0) {
			inst = *(opc);
		} else {
			vpn2 = va & VPN2_MASK;
			asid = kvm_read_c0_guest_entryhi(cop0) &
						KVM_ENTRYHI_ASID;
			index = kvm_mips_guest_tlb_lookup(vcpu, vpn2 | asid);
			if (index < 0) {
				kvm_err("%s: get_user_failed for %p, vcpu: %p, ASID: %#lx\n",
					__func__, opc, vcpu, read_c0_entryhi());
				kvm_mips_dump_host_tlbs();
				kvm_mips_dump_guest_tlbs(vcpu);
				local_irq_restore(flags);
				return KVM_INVALID_INST;
			}
			kvm_mips_handle_mapped_seg_tlb_fault(vcpu,
							     &vcpu->arch.
							     guest_tlb[index]);
			inst = *(opc);
		}
		local_irq_restore(flags);
	} else if (KVM_GUEST_KSEGX(va) == KVM_GUEST_KSEG0) {
		paddr = kvm_mips_translate_guest_kseg0_to_hpa(vcpu, va);
		vaddr = kmap_atomic(pfn_to_page(PHYS_PFN(paddr)));
		vaddr += paddr & ~PAGE_MASK;
		inst = *(u32 *)vaddr;
		kunmap_atomic(vaddr);
	} else {
		kvm_err("%s: illegal address: %p\n", __func__, opc);
		return KVM_INVALID_INST;
	}

	return inst;
}
Commit	Line	Data
403015b3 JH	1	/*
	2	* This file is subject to the terms and conditions of the GNU General Public
	3	* License. See the file "COPYING" in the main directory of this archive
	4	* for more details.
	5	*
	6	* KVM/MIPS MMU handling in the KVM module.
	7	*
	8	* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
	9	* Authors: Sanjay Lal <sanjayl@kymasys.com>
	10	*/
	11
28cc5bd5	12	#include <linux/highmem.h>
403015b3 JH	13	#include <linux/kvm_host.h>
	14	#include <asm/mmu_context.h>
	15
	16	static u32 kvm_mips_get_kernel_asid(struct kvm_vcpu *vcpu)
	17	{
	18	int cpu = smp_processor_id();
	19
	20	return vcpu->arch.guest_kernel_asid[cpu] &
	21	cpu_asid_mask(&cpu_data[cpu]);
	22	}
	23
	24	static u32 kvm_mips_get_user_asid(struct kvm_vcpu *vcpu)
	25	{
	26	int cpu = smp_processor_id();
	27
	28	return vcpu->arch.guest_user_asid[cpu] &
	29	cpu_asid_mask(&cpu_data[cpu]);
	30	}
	31
	32	static int kvm_mips_map_page(struct kvm *kvm, gfn_t gfn)
	33	{
	34	int srcu_idx, err = 0;
	35	kvm_pfn_t pfn;
	36
	37	if (kvm->arch.guest_pmap[gfn] != KVM_INVALID_PAGE)
	38	return 0;
	39
	40	srcu_idx = srcu_read_lock(&kvm->srcu);
9befad23	41	pfn = gfn_to_pfn(kvm, gfn);
403015b3	42
9befad23	43	if (is_error_pfn(pfn)) {
403015b3 JH	44	kvm_err("Couldn't get pfn for gfn %#llx!\n", gfn);
	45	err = -EFAULT;
	46	goto out;
	47	}
	48
	49	kvm->arch.guest_pmap[gfn] = pfn;
	50	out:
	51	srcu_read_unlock(&kvm->srcu, srcu_idx);
	52	return err;
	53	}
	54
	55	/* Translate guest KSEG0 addresses to Host PA */
	56	unsigned long kvm_mips_translate_guest_kseg0_to_hpa(struct kvm_vcpu *vcpu,
	57	unsigned long gva)
	58	{
	59	gfn_t gfn;
	60	unsigned long offset = gva & ~PAGE_MASK;
	61	struct kvm *kvm = vcpu->kvm;
	62
	63	if (KVM_GUEST_KSEGX(gva) != KVM_GUEST_KSEG0) {
	64	kvm_err("%s/%p: Invalid gva: %#lx\n", __func__,
	65	__builtin_return_address(0), gva);
	66	return KVM_INVALID_PAGE;
	67	}
	68
	69	gfn = (KVM_GUEST_CPHYSADDR(gva) >> PAGE_SHIFT);
	70
	71	if (gfn >= kvm->arch.guest_pmap_npages) {
	72	kvm_err("%s: Invalid gfn: %#llx, GVA: %#lx\n", __func__, gfn,
	73	gva);
	74	return KVM_INVALID_PAGE;
	75	}
	76
	77	if (kvm_mips_map_page(vcpu->kvm, gfn) < 0)
	78	return KVM_INVALID_ADDR;
	79
	80	return (kvm->arch.guest_pmap[gfn] << PAGE_SHIFT) + offset;
	81	}
	82
	83	/* XXXKYMA: Must be called with interrupts disabled */
	84	int kvm_mips_handle_kseg0_tlb_fault(unsigned long badvaddr,
	85	struct kvm_vcpu *vcpu)
	86	{
	87	gfn_t gfn;
	88	kvm_pfn_t pfn0, pfn1;
	89	unsigned long vaddr = 0;
	90	unsigned long entryhi = 0, entrylo0 = 0, entrylo1 = 0;
403015b3 JH	91	struct kvm *kvm = vcpu->kvm;
	92	const int flush_dcache_mask = 0;
	93	int ret;
	94
	95	if (KVM_GUEST_KSEGX(badvaddr) != KVM_GUEST_KSEG0) {
	96	kvm_err("%s: Invalid BadVaddr: %#lx\n", __func__, badvaddr);
	97	kvm_mips_dump_host_tlbs();
	98	return -1;
	99	}
	100
	101	gfn = (KVM_GUEST_CPHYSADDR(badvaddr) >> PAGE_SHIFT);
	102	if (gfn >= kvm->arch.guest_pmap_npages) {
	103	kvm_err("%s: Invalid gfn: %#llx, BadVaddr: %#lx\n", __func__,
	104	gfn, badvaddr);
	105	kvm_mips_dump_host_tlbs();
	106	return -1;
	107	}
403015b3 JH	108	vaddr = badvaddr & (PAGE_MASK << 1);
	109
	110	if (kvm_mips_map_page(vcpu->kvm, gfn) < 0)
	111	return -1;
	112
	113	if (kvm_mips_map_page(vcpu->kvm, gfn ^ 0x1) < 0)
	114	return -1;
	115
021df206 JH	116	pfn0 = kvm->arch.guest_pmap[gfn & ~0x1];
021df206 JH	117	pfn1 = kvm->arch.guest_pmap[gfn \| 0x1];
403015b3	118
e6207bbe	119	entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) \|
7414d2f6 JH	120	((_page_cachable_default >> _CACHE_SHIFT) << ENTRYLO_C_SHIFT) \|
7414d2f6 JH	121	ENTRYLO_D \| ENTRYLO_V;
e6207bbe	122	entrylo1 = mips3_paddr_to_tlbpfn(pfn1 << PAGE_SHIFT) \|
7414d2f6 JH	123	((_page_cachable_default >> _CACHE_SHIFT) << ENTRYLO_C_SHIFT) \|
7414d2f6 JH	124	ENTRYLO_D \| ENTRYLO_V;
403015b3 JH	125
	126	preempt_disable();
	127	entryhi = (vaddr \| kvm_mips_get_kernel_asid(vcpu));
	128	ret = kvm_mips_host_tlb_write(vcpu, entryhi, entrylo0, entrylo1,
	129	flush_dcache_mask);
	130	preempt_enable();
	131
	132	return ret;
	133	}
	134
	135	int kvm_mips_handle_mapped_seg_tlb_fault(struct kvm_vcpu *vcpu,
26ee17ff	136	struct kvm_mips_tlb *tlb)
403015b3 JH	137	{
	138	unsigned long entryhi = 0, entrylo0 = 0, entrylo1 = 0;
	139	struct kvm *kvm = vcpu->kvm;
	140	kvm_pfn_t pfn0, pfn1;
c604cffa	141	long tlb_lo[2];
403015b3 JH	142	int ret;
403015b3 JH	143
c604cffa JH	144	tlb_lo[0] = tlb->tlb_lo[0];
	145	tlb_lo[1] = tlb->tlb_lo[1];
	146
	147	/*
	148	* The commpage address must not be mapped to anything else if the guest
	149	* TLB contains entries nearby, or commpage accesses will break.
	150	*/
	151	if (!((tlb->tlb_hi ^ KVM_GUEST_COMMPAGE_ADDR) &
	152	VPN2_MASK & (PAGE_MASK << 1)))
	153	tlb_lo[(KVM_GUEST_COMMPAGE_ADDR >> PAGE_SHIFT) & 1] = 0;
	154
	155	if (kvm_mips_map_page(kvm, mips3_tlbpfn_to_paddr(tlb_lo[0])
	156	>> PAGE_SHIFT) < 0)
	157	return -1;
	158
	159	if (kvm_mips_map_page(kvm, mips3_tlbpfn_to_paddr(tlb_lo[1])
	160	>> PAGE_SHIFT) < 0)
	161	return -1;
	162
	163	pfn0 = kvm->arch.guest_pmap[
	164	mips3_tlbpfn_to_paddr(tlb_lo[0]) >> PAGE_SHIFT];
	165	pfn1 = kvm->arch.guest_pmap[
	166	mips3_tlbpfn_to_paddr(tlb_lo[1]) >> PAGE_SHIFT];
403015b3	167
403015b3	168	/* Get attributes from the Guest TLB */
e6207bbe	169	entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) \|
7414d2f6	170	((_page_cachable_default >> _CACHE_SHIFT) << ENTRYLO_C_SHIFT) \|
c604cffa JH	171	(tlb_lo[0] & ENTRYLO_D) \|
c604cffa JH	172	(tlb_lo[0] & ENTRYLO_V);
e6207bbe	173	entrylo1 = mips3_paddr_to_tlbpfn(pfn1 << PAGE_SHIFT) \|
7414d2f6	174	((_page_cachable_default >> _CACHE_SHIFT) << ENTRYLO_C_SHIFT) \|
c604cffa JH	175	(tlb_lo[1] & ENTRYLO_D) \|
c604cffa JH	176	(tlb_lo[1] & ENTRYLO_V);
403015b3 JH	177
403015b3 JH	178	kvm_debug("@ %#lx tlb_lo0: 0x%08lx tlb_lo1: 0x%08lx\n", vcpu->arch.pc,
9fbfb06a	179	tlb->tlb_lo[0], tlb->tlb_lo[1]);
403015b3 JH	180
	181	preempt_disable();
	182	entryhi = (tlb->tlb_hi & VPN2_MASK) \| (KVM_GUEST_KERNEL_MODE(vcpu) ?
	183	kvm_mips_get_kernel_asid(vcpu) :
	184	kvm_mips_get_user_asid(vcpu));
	185	ret = kvm_mips_host_tlb_write(vcpu, entryhi, entrylo0, entrylo1,
	186	tlb->tlb_mask);
	187	preempt_enable();
	188
	189	return ret;
	190	}
	191
	192	void kvm_get_new_mmu_context(struct mm_struct *mm, unsigned long cpu,
	193	struct kvm_vcpu *vcpu)
	194	{
	195	unsigned long asid = asid_cache(cpu);
	196
	197	asid += cpu_asid_inc();
	198	if (!(asid & cpu_asid_mask(&cpu_data[cpu]))) {
	199	if (cpu_has_vtag_icache)
	200	flush_icache_all();
	201
	202	kvm_local_flush_tlb_all(); /* start new asid cycle */
	203
	204	if (!asid) /* fix version if needed */
	205	asid = asid_first_version(cpu);
	206	}
	207
	208	cpu_context(cpu, mm) = asid_cache(cpu) = asid;
	209	}
	210
	211	/**
	212	* kvm_mips_migrate_count() - Migrate timer.
	213	* @vcpu: Virtual CPU.
	214	*
	215	* Migrate CP0_Count hrtimer to the current CPU by cancelling and restarting it
	216	* if it was running prior to being cancelled.
	217	*
	218	* Must be called when the VCPU is migrated to a different CPU to ensure that
	219	* timer expiry during guest execution interrupts the guest and causes the
	220	* interrupt to be delivered in a timely manner.
	221	*/
	222	static void kvm_mips_migrate_count(struct kvm_vcpu *vcpu)
	223	{
	224	if (hrtimer_cancel(&vcpu->arch.comparecount_timer))
	225	hrtimer_restart(&vcpu->arch.comparecount_timer);
	226	}
	227
	228	/* Restore ASID once we are scheduled back after preemption */
	229	void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
	230	{
	231	unsigned long asid_mask = cpu_asid_mask(&cpu_data[cpu]);
	232	unsigned long flags;
	233	int newasid = 0;
	234
	235	kvm_debug("%s: vcpu %p, cpu: %d\n", __func__, vcpu, cpu);
	236
	237	/* Allocate new kernel and user ASIDs if needed */
	238
	239	local_irq_save(flags);
	240
	241	if ((vcpu->arch.guest_kernel_asid[cpu] ^ asid_cache(cpu)) &
	242	asid_version_mask(cpu)) {
	243	kvm_get_new_mmu_context(&vcpu->arch.guest_kernel_mm, cpu, vcpu);
244	vcpu->arch.guest_kernel_asid[cpu] =
245	vcpu->arch.guest_kernel_mm.context.asid[cpu];
246	kvm_get_new_mmu_context(&vcpu->arch.guest_user_mm, cpu, vcpu);
247	vcpu->arch.guest_user_asid[cpu] =
248	vcpu->arch.guest_user_mm.context.asid[cpu];
249	newasid++;
250
251	kvm_debug("[%d]: cpu_context: %#lx\n", cpu,
252	cpu_context(cpu, current->mm));
253	kvm_debug("[%d]: Allocated new ASID for Guest Kernel: %#x\n",
254	cpu, vcpu->arch.guest_kernel_asid[cpu]);
255	kvm_debug("[%d]: Allocated new ASID for Guest User: %#x\n", cpu,
256	vcpu->arch.guest_user_asid[cpu]);
257	}
258
259	if (vcpu->arch.last_sched_cpu != cpu) {
260	kvm_debug("[%d->%d]KVM VCPU[%d] switch\n",
261	vcpu->arch.last_sched_cpu, cpu, vcpu->vcpu_id);
262	/*
263	* Migrate the timer interrupt to the current CPU so that it
264	* always interrupts the guest and synchronously triggers a
265	* guest timer interrupt.
266	*/
267	kvm_mips_migrate_count(vcpu);
268	}
269
270	if (!newasid) {
271	/*
272	* If we preempted while the guest was executing, then reload
273	* the pre-empted ASID
274	*/
275	if (current->flags & PF_VCPU) {
276	write_c0_entryhi(vcpu->arch.
277	preempt_entryhi & asid_mask);
278	ehb();
279	}
280	} else {
281	/* New ASIDs were allocated for the VM */
282
283	/*
284	* Were we in guest context? If so then the pre-empted ASID is
285	* no longer valid, we need to set it to what it should be based
286	* on the mode of the Guest (Kernel/User)
287	*/
288	if (current->flags & PF_VCPU) {
289	if (KVM_GUEST_KERNEL_MODE(vcpu))
290	write_c0_entryhi(vcpu->arch.
291	guest_kernel_asid[cpu] &
292	asid_mask);
293	else
294	write_c0_entryhi(vcpu->arch.
295	guest_user_asid[cpu] &
296	asid_mask);
297	ehb();
298	}
299	}
300
301	/* restore guest state to registers */
302	kvm_mips_callbacks->vcpu_set_regs(vcpu);
303
304	local_irq_restore(flags);
305
306	}
307
308	/* ASID can change if another task is scheduled during preemption */
309	void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
310	{
311	unsigned long flags;
312	int cpu;
313
314	local_irq_save(flags);
315
316	cpu = smp_processor_id();
317
318	vcpu->arch.preempt_entryhi = read_c0_entryhi();
319	vcpu->arch.last_sched_cpu = cpu;
320
321	/* save guest state in registers */
322	kvm_mips_callbacks->vcpu_get_regs(vcpu);
323
324	if (((cpu_context(cpu, current->mm) ^ asid_cache(cpu)) &
325	asid_version_mask(cpu))) {
326	kvm_debug("%s: Dropping MMU Context: %#lx\n", __func__,
327	cpu_context(cpu, current->mm));
328	drop_mmu_context(current->mm, cpu);
329	}
330	write_c0_entryhi(cpu_asid(cpu, current->mm));
331	ehb();
332
333	local_irq_restore(flags);
334	}
335
336	u32 kvm_get_inst(u32 opc, struct kvm_vcpu vcpu)
337	{
338	struct mips_coproc *cop0 = vcpu->arch.cop0;
339	unsigned long paddr, flags, vpn2, asid;
35fec262	340	unsigned long va = (unsigned long)opc;
28cc5bd5	341	void *vaddr;
403015b3 JH	342	u32 inst;
	343	int index;
	344
35fec262 JH	345	if (KVM_GUEST_KSEGX(va) < KVM_GUEST_KSEG0 \|\|
35fec262 JH	346	KVM_GUEST_KSEGX(va) == KVM_GUEST_KSEG23) {
403015b3	347	local_irq_save(flags);
35fec262	348	index = kvm_mips_host_tlb_lookup(vcpu, va);
403015b3 JH	349	if (index >= 0) {
	350	inst = *(opc);
	351	} else {
35fec262	352	vpn2 = va & VPN2_MASK;
403015b3 JH	353	asid = kvm_read_c0_guest_entryhi(cop0) &
	354	KVM_ENTRYHI_ASID;
	355	index = kvm_mips_guest_tlb_lookup(vcpu, vpn2 \| asid);
	356	if (index < 0) {
	357	kvm_err("%s: get_user_failed for %p, vcpu: %p, ASID: %#lx\n",
	358	__func__, opc, vcpu, read_c0_entryhi());
	359	kvm_mips_dump_host_tlbs();
eafc4ed2	360	kvm_mips_dump_guest_tlbs(vcpu);
403015b3 JH	361	local_irq_restore(flags);
	362	return KVM_INVALID_INST;
	363	}
	364	kvm_mips_handle_mapped_seg_tlb_fault(vcpu,
	365	&vcpu->arch.
26ee17ff	366	guest_tlb[index]);
403015b3 JH	367	inst = *(opc);
	368	}
	369	local_irq_restore(flags);
35fec262 JH	370	} else if (KVM_GUEST_KSEGX(va) == KVM_GUEST_KSEG0) {
35fec262 JH	371	paddr = kvm_mips_translate_guest_kseg0_to_hpa(vcpu, va);
28cc5bd5 JH	372	vaddr = kmap_atomic(pfn_to_page(PHYS_PFN(paddr)));
	373	vaddr += paddr & ~PAGE_MASK;
	374	inst = (u32 )vaddr;
	375	kunmap_atomic(vaddr);
403015b3 JH	376	} else {
	377	kvm_err("%s: illegal address: %p\n", __func__, opc);
	378	return KVM_INVALID_INST;
	379	}
	380
	381	return inst;
	382	}