blob: 3d3f22301a352a8f2b1bf4269937bb8b27011cb2 [file] [log] [blame]
/*
* 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 TLB handling, this file is part of the Linux host kernel so that
* TLB handlers run from KSEG0
*
* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
* Authors: Sanjay Lal <sanjayl@kymasys.com>
*/
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/kvm_host.h>
#include <linux/srcu.h>
#include <asm/cpu.h>
#include <asm/bootinfo.h>
#include <asm/mmu_context.h>
#include <asm/pgtable.h>
#include <asm/cacheflush.h>
#include <asm/tlb.h>
#undef CONFIG_MIPS_MT
#include <asm/r4kcache.h>
#define CONFIG_MIPS_MT
#define KVM_GUEST_PC_TLB 0
#define KVM_GUEST_SP_TLB 1
#define PRIx64 "llx"
atomic_t kvm_mips_instance;
EXPORT_SYMBOL(kvm_mips_instance);
/* These function pointers are initialized once the KVM module is loaded */
pfn_t (*kvm_mips_gfn_to_pfn)(struct kvm *kvm, gfn_t gfn);
EXPORT_SYMBOL(kvm_mips_gfn_to_pfn);
void (*kvm_mips_release_pfn_clean)(pfn_t pfn);
EXPORT_SYMBOL(kvm_mips_release_pfn_clean);
bool (*kvm_mips_is_error_pfn)(pfn_t pfn);
EXPORT_SYMBOL(kvm_mips_is_error_pfn);
uint32_t kvm_mips_get_kernel_asid(struct kvm_vcpu *vcpu)
{
return vcpu->arch.guest_kernel_asid[smp_processor_id()] & ASID_MASK;
}
uint32_t kvm_mips_get_user_asid(struct kvm_vcpu *vcpu)
{
return vcpu->arch.guest_user_asid[smp_processor_id()] & ASID_MASK;
}
inline uint32_t kvm_mips_get_commpage_asid(struct kvm_vcpu *vcpu)
{
return vcpu->kvm->arch.commpage_tlb;
}
/* Structure defining an tlb entry data set. */
void kvm_mips_dump_host_tlbs(void)
{
unsigned long old_entryhi;
unsigned long old_pagemask;
struct kvm_mips_tlb tlb;
unsigned long flags;
int i;
local_irq_save(flags);
old_entryhi = read_c0_entryhi();
old_pagemask = read_c0_pagemask();
kvm_info("HOST TLBs:\n");
kvm_info("ASID: %#lx\n", read_c0_entryhi() & ASID_MASK);
for (i = 0; i < current_cpu_data.tlbsize; i++) {
write_c0_index(i);
mtc0_tlbw_hazard();
tlb_read();
tlbw_use_hazard();
tlb.tlb_hi = read_c0_entryhi();
tlb.tlb_lo0 = read_c0_entrylo0();
tlb.tlb_lo1 = read_c0_entrylo1();
tlb.tlb_mask = read_c0_pagemask();
kvm_info("TLB%c%3d Hi 0x%08lx ",
(tlb.tlb_lo0 | tlb.tlb_lo1) & MIPS3_PG_V ? ' ' : '*',
i, tlb.tlb_hi);
kvm_info("Lo0=0x%09" PRIx64 " %c%c attr %lx ",
(uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo0),
(tlb.tlb_lo0 & MIPS3_PG_D) ? 'D' : ' ',
(tlb.tlb_lo0 & MIPS3_PG_G) ? 'G' : ' ',
(tlb.tlb_lo0 >> 3) & 7);
kvm_info("Lo1=0x%09" PRIx64 " %c%c attr %lx sz=%lx\n",
(uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo1),
(tlb.tlb_lo1 & MIPS3_PG_D) ? 'D' : ' ',
(tlb.tlb_lo1 & MIPS3_PG_G) ? 'G' : ' ',
(tlb.tlb_lo1 >> 3) & 7, tlb.tlb_mask);
}
write_c0_entryhi(old_entryhi);
write_c0_pagemask(old_pagemask);
mtc0_tlbw_hazard();
local_irq_restore(flags);
}
EXPORT_SYMBOL(kvm_mips_dump_host_tlbs);
void kvm_mips_dump_guest_tlbs(struct kvm_vcpu *vcpu)
{
struct mips_coproc *cop0 = vcpu->arch.cop0;
struct kvm_mips_tlb tlb;
int i;
kvm_info("Guest TLBs:\n");
kvm_info("Guest EntryHi: %#lx\n", kvm_read_c0_guest_entryhi(cop0));
for (i = 0; i < KVM_MIPS_GUEST_TLB_SIZE; i++) {
tlb = vcpu->arch.guest_tlb[i];
kvm_info("TLB%c%3d Hi 0x%08lx ",
(tlb.tlb_lo0 | tlb.tlb_lo1) & MIPS3_PG_V ? ' ' : '*',
i, tlb.tlb_hi);
kvm_info("Lo0=0x%09" PRIx64 " %c%c attr %lx ",
(uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo0),
(tlb.tlb_lo0 & MIPS3_PG_D) ? 'D' : ' ',
(tlb.tlb_lo0 & MIPS3_PG_G) ? 'G' : ' ',
(tlb.tlb_lo0 >> 3) & 7);
kvm_info("Lo1=0x%09" PRIx64 " %c%c attr %lx sz=%lx\n",
(uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo1),
(tlb.tlb_lo1 & MIPS3_PG_D) ? 'D' : ' ',
(tlb.tlb_lo1 & MIPS3_PG_G) ? 'G' : ' ',
(tlb.tlb_lo1 >> 3) & 7, tlb.tlb_mask);
}
}
EXPORT_SYMBOL(kvm_mips_dump_guest_tlbs);
static int kvm_mips_map_page(struct kvm *kvm, gfn_t gfn)
{
int srcu_idx, err = 0;
pfn_t pfn;
if (kvm->arch.guest_pmap[gfn] != KVM_INVALID_PAGE)
return 0;
srcu_idx = srcu_read_lock(&kvm->srcu);
pfn = kvm_mips_gfn_to_pfn(kvm, gfn);
if (kvm_mips_is_error_pfn(pfn)) {
kvm_err("Couldn't get pfn for gfn %#" PRIx64 "!\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;
uint32_t 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;
}
EXPORT_SYMBOL(kvm_mips_translate_guest_kseg0_to_hpa);
/* XXXKYMA: Must be called with interrupts disabled */
/* set flush_dcache_mask == 0 if no dcache flush required */
int kvm_mips_host_tlb_write(struct kvm_vcpu *vcpu, unsigned long entryhi,
unsigned long entrylo0, unsigned long entrylo1,
int flush_dcache_mask)
{
unsigned long flags;
unsigned long old_entryhi;
int idx;
local_irq_save(flags);
old_entryhi = read_c0_entryhi();
write_c0_entryhi(entryhi);
mtc0_tlbw_hazard();
tlb_probe();
tlb_probe_hazard();
idx = read_c0_index();
if (idx > current_cpu_data.tlbsize) {
kvm_err("%s: Invalid Index: %d\n", __func__, idx);
kvm_mips_dump_host_tlbs();
local_irq_restore(flags);
return -1;
}
write_c0_entrylo0(entrylo0);
write_c0_entrylo1(entrylo1);
mtc0_tlbw_hazard();
if (idx < 0)
tlb_write_random();
else
tlb_write_indexed();
tlbw_use_hazard();
kvm_debug("@ %#lx idx: %2d [entryhi(R): %#lx] entrylo0(R): 0x%08lx, entrylo1(R): 0x%08lx\n",
vcpu->arch.pc, idx, read_c0_entryhi(),
read_c0_entrylo0(), read_c0_entrylo1());
/* Flush D-cache */
if (flush_dcache_mask) {
if (entrylo0 & MIPS3_PG_V) {
++vcpu->stat.flush_dcache_exits;
flush_data_cache_page((entryhi & VPN2_MASK) &
~flush_dcache_mask);
}
if (entrylo1 & MIPS3_PG_V) {
++vcpu->stat.flush_dcache_exits;
flush_data_cache_page(((entryhi & VPN2_MASK) &
~flush_dcache_mask) |
(0x1 << PAGE_SHIFT));
}
}
/* Restore old ASID */
write_c0_entryhi(old_entryhi);
mtc0_tlbw_hazard();
tlbw_use_hazard();
local_irq_restore(flags);
return 0;
}
/* XXXKYMA: Must be called with interrupts disabled */
int kvm_mips_handle_kseg0_tlb_fault(unsigned long badvaddr,
struct kvm_vcpu *vcpu)
{
gfn_t gfn;
pfn_t pfn0, pfn1;
unsigned long vaddr = 0;
unsigned long entryhi = 0, entrylo0 = 0, entrylo1 = 0;
int even;
struct kvm *kvm = vcpu->kvm;
const int flush_dcache_mask = 0;
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;
}
even = !(gfn & 0x1);
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;
if (even) {
pfn0 = kvm->arch.guest_pmap[gfn];
pfn1 = kvm->arch.guest_pmap[gfn ^ 0x1];
} else {
pfn0 = kvm->arch.guest_pmap[gfn ^ 0x1];
pfn1 = kvm->arch.guest_pmap[gfn];
}
entryhi = (vaddr | kvm_mips_get_kernel_asid(vcpu));
entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) |
(1 << 2) | (0x1 << 1);
entrylo1 = mips3_paddr_to_tlbpfn(pfn1 << PAGE_SHIFT) | (0x3 << 3) |
(1 << 2) | (0x1 << 1);
return kvm_mips_host_tlb_write(vcpu, entryhi, entrylo0, entrylo1,
flush_dcache_mask);
}
EXPORT_SYMBOL(kvm_mips_handle_kseg0_tlb_fault);
int kvm_mips_handle_commpage_tlb_fault(unsigned long badvaddr,
struct kvm_vcpu *vcpu)
{
pfn_t pfn0, pfn1;
unsigned long flags, old_entryhi = 0, vaddr = 0;
unsigned long entrylo0 = 0, entrylo1 = 0;
pfn0 = CPHYSADDR(vcpu->arch.kseg0_commpage) >> PAGE_SHIFT;
pfn1 = 0;
entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) |
(1 << 2) | (0x1 << 1);
entrylo1 = 0;
local_irq_save(flags);
old_entryhi = read_c0_entryhi();
vaddr = badvaddr & (PAGE_MASK << 1);
write_c0_entryhi(vaddr | kvm_mips_get_kernel_asid(vcpu));
mtc0_tlbw_hazard();
write_c0_entrylo0(entrylo0);
mtc0_tlbw_hazard();
write_c0_entrylo1(entrylo1);
mtc0_tlbw_hazard();
write_c0_index(kvm_mips_get_commpage_asid(vcpu));
mtc0_tlbw_hazard();
tlb_write_indexed();
mtc0_tlbw_hazard();
tlbw_use_hazard();
kvm_debug("@ %#lx idx: %2d [entryhi(R): %#lx] entrylo0 (R): 0x%08lx, entrylo1(R): 0x%08lx\n",
vcpu->arch.pc, read_c0_index(), read_c0_entryhi(),
read_c0_entrylo0(), read_c0_entrylo1());
/* Restore old ASID */
write_c0_entryhi(old_entryhi);
mtc0_tlbw_hazard();
tlbw_use_hazard();
local_irq_restore(flags);
return 0;
}
EXPORT_SYMBOL(kvm_mips_handle_commpage_tlb_fault);
int kvm_mips_handle_mapped_seg_tlb_fault(struct kvm_vcpu *vcpu,
struct kvm_mips_tlb *tlb,
unsigned long *hpa0,
unsigned long *hpa1)
{
unsigned long entryhi = 0, entrylo0 = 0, entrylo1 = 0;
struct kvm *kvm = vcpu->kvm;
pfn_t pfn0, pfn1;
if ((tlb->tlb_hi & VPN2_MASK) == 0) {
pfn0 = 0;
pfn1 = 0;
} else {
if (kvm_mips_map_page(kvm, mips3_tlbpfn_to_paddr(tlb->tlb_lo0)
>> PAGE_SHIFT) < 0)
return -1;
if (kvm_mips_map_page(kvm, mips3_tlbpfn_to_paddr(tlb->tlb_lo1)
>> PAGE_SHIFT) < 0)
return -1;
pfn0 = kvm->arch.guest_pmap[mips3_tlbpfn_to_paddr(tlb->tlb_lo0)
>> PAGE_SHIFT];
pfn1 = kvm->arch.guest_pmap[mips3_tlbpfn_to_paddr(tlb->tlb_lo1)
>> PAGE_SHIFT];
}
if (hpa0)
*hpa0 = pfn0 << PAGE_SHIFT;
if (hpa1)
*hpa1 = pfn1 << PAGE_SHIFT;
/* Get attributes from the Guest TLB */
entryhi = (tlb->tlb_hi & VPN2_MASK) | (KVM_GUEST_KERNEL_MODE(vcpu) ?
kvm_mips_get_kernel_asid(vcpu) :
kvm_mips_get_user_asid(vcpu));
entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) |
(tlb->tlb_lo0 & MIPS3_PG_D) | (tlb->tlb_lo0 & MIPS3_PG_V);
entrylo1 = mips3_paddr_to_tlbpfn(pfn1 << PAGE_SHIFT) | (0x3 << 3) |
(tlb->tlb_lo1 & MIPS3_PG_D) | (tlb->tlb_lo1 & MIPS3_PG_V);
kvm_debug("@ %#lx tlb_lo0: 0x%08lx tlb_lo1: 0x%08lx\n", vcpu->arch.pc,
tlb->tlb_lo0, tlb->tlb_lo1);
return kvm_mips_host_tlb_write(vcpu, entryhi, entrylo0, entrylo1,
tlb->tlb_mask);
}
EXPORT_SYMBOL(kvm_mips_handle_mapped_seg_tlb_fault);
int kvm_mips_guest_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long entryhi)
{
int i;
int index = -1;
struct kvm_mips_tlb *tlb = vcpu->arch.guest_tlb;
for (i = 0; i < KVM_MIPS_GUEST_TLB_SIZE; i++) {
if (TLB_HI_VPN2_HIT(tlb[i], entryhi) &&
TLB_HI_ASID_HIT(tlb[i], entryhi)) {
index = i;
break;
}
}
kvm_debug("%s: entryhi: %#lx, index: %d lo0: %#lx, lo1: %#lx\n",
__func__, entryhi, index, tlb[i].tlb_lo0, tlb[i].tlb_lo1);
return index;
}
EXPORT_SYMBOL(kvm_mips_guest_tlb_lookup);
int kvm_mips_host_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long vaddr)
{
unsigned long old_entryhi, flags;
int idx;
local_irq_save(flags);
old_entryhi = read_c0_entryhi();
if (KVM_GUEST_KERNEL_MODE(vcpu))
write_c0_entryhi((vaddr & VPN2_MASK) |
kvm_mips_get_kernel_asid(vcpu));
else {
write_c0_entryhi((vaddr & VPN2_MASK) |
kvm_mips_get_user_asid(vcpu));
}
mtc0_tlbw_hazard();
tlb_probe();
tlb_probe_hazard();
idx = read_c0_index();
/* Restore old ASID */
write_c0_entryhi(old_entryhi);
mtc0_tlbw_hazard();
tlbw_use_hazard();
local_irq_restore(flags);
kvm_debug("Host TLB lookup, %#lx, idx: %2d\n", vaddr, idx);
return idx;
}
EXPORT_SYMBOL(kvm_mips_host_tlb_lookup);
int kvm_mips_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long va)
{
int idx;
unsigned long flags, old_entryhi;
local_irq_save(flags);
old_entryhi = read_c0_entryhi();
write_c0_entryhi((va & VPN2_MASK) | kvm_mips_get_user_asid(vcpu));
mtc0_tlbw_hazard();
tlb_probe();
tlb_probe_hazard();
idx = read_c0_index();
if (idx >= current_cpu_data.tlbsize)
BUG();
if (idx > 0) {
write_c0_entryhi(UNIQUE_ENTRYHI(idx));
mtc0_tlbw_hazard();
write_c0_entrylo0(0);
mtc0_tlbw_hazard();
write_c0_entrylo1(0);
mtc0_tlbw_hazard();
tlb_write_indexed();
mtc0_tlbw_hazard();
}
write_c0_entryhi(old_entryhi);
mtc0_tlbw_hazard();
tlbw_use_hazard();
local_irq_restore(flags);
if (idx > 0)
kvm_debug("%s: Invalidated entryhi %#lx @ idx %d\n", __func__,
(va & VPN2_MASK) | kvm_mips_get_user_asid(vcpu), idx);
return 0;
}
EXPORT_SYMBOL(kvm_mips_host_tlb_inv);
/* XXXKYMA: Fix Guest USER/KERNEL no longer share the same ASID */
int kvm_mips_host_tlb_inv_index(struct kvm_vcpu *vcpu, int index)
{
unsigned long flags, old_entryhi;
if (index >= current_cpu_data.tlbsize)
BUG();
local_irq_save(flags);
old_entryhi = read_c0_entryhi();
write_c0_entryhi(UNIQUE_ENTRYHI(index));
mtc0_tlbw_hazard();
write_c0_index(index);
mtc0_tlbw_hazard();
write_c0_entrylo0(0);
mtc0_tlbw_hazard();
write_c0_entrylo1(0);
mtc0_tlbw_hazard();
tlb_write_indexed();
mtc0_tlbw_hazard();
tlbw_use_hazard();
write_c0_entryhi(old_entryhi);
mtc0_tlbw_hazard();
tlbw_use_hazard();
local_irq_restore(flags);
return 0;
}
void kvm_mips_flush_host_tlb(int skip_kseg0)
{
unsigned long flags;
unsigned long old_entryhi, entryhi;
unsigned long old_pagemask;
int entry = 0;
int maxentry = current_cpu_data.tlbsize;
local_irq_save(flags);
old_entryhi = read_c0_entryhi();
old_pagemask = read_c0_pagemask();
/* Blast 'em all away. */
for (entry = 0; entry < maxentry; entry++) {
write_c0_index(entry);
mtc0_tlbw_hazard();
if (skip_kseg0) {
tlb_read();
tlbw_use_hazard();
entryhi = read_c0_entryhi();
/* Don't blow away guest kernel entries */
if (KVM_GUEST_KSEGX(entryhi) == KVM_GUEST_KSEG0)
continue;
}
/* Make sure all entries differ. */
write_c0_entryhi(UNIQUE_ENTRYHI(entry));
mtc0_tlbw_hazard();
write_c0_entrylo0(0);
mtc0_tlbw_hazard();
write_c0_entrylo1(0);
mtc0_tlbw_hazard();
tlb_write_indexed();
mtc0_tlbw_hazard();
}
tlbw_use_hazard();
write_c0_entryhi(old_entryhi);
write_c0_pagemask(old_pagemask);
mtc0_tlbw_hazard();
tlbw_use_hazard();
local_irq_restore(flags);
}
EXPORT_SYMBOL(kvm_mips_flush_host_tlb);
void kvm_get_new_mmu_context(struct mm_struct *mm, unsigned long cpu,
struct kvm_vcpu *vcpu)
{
unsigned long asid = asid_cache(cpu);
asid += ASID_INC;
if (!(asid & ASID_MASK)) {
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_context(cpu, mm) = asid_cache(cpu) = asid;
}
void kvm_local_flush_tlb_all(void)
{
unsigned long flags;
unsigned long old_ctx;
int entry = 0;
local_irq_save(flags);
/* Save old context and create impossible VPN2 value */
old_ctx = read_c0_entryhi();
write_c0_entrylo0(0);
write_c0_entrylo1(0);
/* Blast 'em all away. */
while (entry < current_cpu_data.tlbsize) {
/* Make sure all entries differ. */
write_c0_entryhi(UNIQUE_ENTRYHI(entry));
write_c0_index(entry);
mtc0_tlbw_hazard();
tlb_write_indexed();
entry++;
}
tlbw_use_hazard();
write_c0_entryhi(old_ctx);
mtc0_tlbw_hazard();
local_irq_restore(flags);
}
EXPORT_SYMBOL(kvm_local_flush_tlb_all);
/**
* 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 flags;
int newasid = 0;
kvm_debug("%s: vcpu %p, cpu: %d\n", __func__, vcpu, cpu);
/* Alocate new kernel and user ASIDs if needed */
local_irq_save(flags);
if ((vcpu->arch.guest_kernel_asid[cpu] ^ asid_cache(cpu)) &
ASID_VERSION_MASK) {
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);
}
EXPORT_SYMBOL(kvm_arch_vcpu_load);
/* ASID can change if another task is scheduled during preemption */
void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
{
unsigned long flags;
uint32_t 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)) {
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);
}
EXPORT_SYMBOL(kvm_arch_vcpu_put);
uint32_t kvm_get_inst(uint32_t *opc, struct kvm_vcpu *vcpu)
{
struct mips_coproc *cop0 = vcpu->arch.cop0;
unsigned long paddr, flags, vpn2, asid;
uint32_t inst;
int index;
if (KVM_GUEST_KSEGX((unsigned long) opc) < KVM_GUEST_KSEG0 ||
KVM_GUEST_KSEGX((unsigned long) opc) == KVM_GUEST_KSEG23) {
local_irq_save(flags);
index = kvm_mips_host_tlb_lookup(vcpu, (unsigned long) opc);
if (index >= 0) {
inst = *(opc);
} else {
vpn2 = (unsigned long) opc & VPN2_MASK;
asid = kvm_read_c0_guest_entryhi(cop0) & ASID_MASK;
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();
local_irq_restore(flags);
return KVM_INVALID_INST;
}
kvm_mips_handle_mapped_seg_tlb_fault(vcpu,
&vcpu->arch.
guest_tlb[index],
NULL, NULL);
inst = *(opc);
}
local_irq_restore(flags);
} else if (KVM_GUEST_KSEGX(opc) == KVM_GUEST_KSEG0) {
paddr =
kvm_mips_translate_guest_kseg0_to_hpa(vcpu,
(unsigned long) opc);
inst = *(uint32_t *) CKSEG0ADDR(paddr);
} else {
kvm_err("%s: illegal address: %p\n", __func__, opc);
return KVM_INVALID_INST;
}
return inst;
}
EXPORT_SYMBOL(kvm_get_inst);