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Diffstat (limited to 'arch/mips/kvm/tlb.c')
-rw-r--r--arch/mips/kvm/tlb.c518
1 files changed, 42 insertions, 476 deletions
diff --git a/arch/mips/kvm/tlb.c b/arch/mips/kvm/tlb.c
index 38bfbc906..254377d8e 100644
--- a/arch/mips/kvm/tlb.c
+++ b/arch/mips/kvm/tlb.c
@@ -14,7 +14,7 @@
#include <linux/smp.h>
#include <linux/mm.h>
#include <linux/delay.h>
-#include <linux/module.h>
+#include <linux/export.h>
#include <linux/kvm_host.h>
#include <linux/srcu.h>
@@ -24,6 +24,7 @@
#include <asm/pgtable.h>
#include <asm/cacheflush.h>
#include <asm/tlb.h>
+#include <asm/tlbdebug.h>
#undef CONFIG_MIPS_MT
#include <asm/r4kcache.h>
@@ -32,22 +33,10 @@
#define KVM_GUEST_PC_TLB 0
#define KVM_GUEST_SP_TLB 1
-#define PRIx64 "llx"
-
atomic_t kvm_mips_instance;
EXPORT_SYMBOL_GPL(kvm_mips_instance);
-/* These function pointers are initialized once the KVM module is loaded */
-kvm_pfn_t (*kvm_mips_gfn_to_pfn)(struct kvm *kvm, gfn_t gfn);
-EXPORT_SYMBOL_GPL(kvm_mips_gfn_to_pfn);
-
-void (*kvm_mips_release_pfn_clean)(kvm_pfn_t pfn);
-EXPORT_SYMBOL_GPL(kvm_mips_release_pfn_clean);
-
-bool (*kvm_mips_is_error_pfn)(kvm_pfn_t pfn);
-EXPORT_SYMBOL_GPL(kvm_mips_is_error_pfn);
-
-uint32_t kvm_mips_get_kernel_asid(struct kvm_vcpu *vcpu)
+static u32 kvm_mips_get_kernel_asid(struct kvm_vcpu *vcpu)
{
int cpu = smp_processor_id();
@@ -55,7 +44,7 @@ uint32_t kvm_mips_get_kernel_asid(struct kvm_vcpu *vcpu)
cpu_asid_mask(&cpu_data[cpu]);
}
-uint32_t kvm_mips_get_user_asid(struct kvm_vcpu *vcpu)
+static u32 kvm_mips_get_user_asid(struct kvm_vcpu *vcpu)
{
int cpu = smp_processor_id();
@@ -63,7 +52,7 @@ uint32_t kvm_mips_get_user_asid(struct kvm_vcpu *vcpu)
cpu_asid_mask(&cpu_data[cpu]);
}
-inline uint32_t kvm_mips_get_commpage_asid(struct kvm_vcpu *vcpu)
+inline u32 kvm_mips_get_commpage_asid(struct kvm_vcpu *vcpu)
{
return vcpu->kvm->arch.commpage_tlb;
}
@@ -72,50 +61,15 @@ inline uint32_t kvm_mips_get_commpage_asid(struct kvm_vcpu *vcpu)
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() &
- cpu_asid_mask(&current_cpu_data));
-
- for (i = 0; i < current_cpu_data.tlbsize; i++) {
- write_c0_index(i);
- mtc0_tlbw_hazard();
-
- tlb_read();
- tlbw_use_hazard();
+ dump_tlb_regs();
+ pr_info("\n");
+ dump_tlb_all();
- 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_GPL(kvm_mips_dump_host_tlbs);
@@ -132,74 +86,24 @@ void kvm_mips_dump_guest_tlbs(struct kvm_vcpu *vcpu)
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 ? ' ' : '*',
+ (tlb.tlb_lo[0] | tlb.tlb_lo[1]) & ENTRYLO_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);
+ kvm_info("Lo0=0x%09llx %c%c attr %lx ",
+ (u64) mips3_tlbpfn_to_paddr(tlb.tlb_lo[0]),
+ (tlb.tlb_lo[0] & ENTRYLO_D) ? 'D' : ' ',
+ (tlb.tlb_lo[0] & ENTRYLO_G) ? 'G' : ' ',
+ (tlb.tlb_lo[0] & ENTRYLO_C) >> ENTRYLO_C_SHIFT);
+ kvm_info("Lo1=0x%09llx %c%c attr %lx sz=%lx\n",
+ (u64) mips3_tlbpfn_to_paddr(tlb.tlb_lo[1]),
+ (tlb.tlb_lo[1] & ENTRYLO_D) ? 'D' : ' ',
+ (tlb.tlb_lo[1] & ENTRYLO_G) ? 'G' : ' ',
+ (tlb.tlb_lo[1] & ENTRYLO_C) >> ENTRYLO_C_SHIFT,
+ tlb.tlb_mask);
}
}
EXPORT_SYMBOL_GPL(kvm_mips_dump_guest_tlbs);
-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 = kvm_mips_gfn_to_pfn(kvm, gfn);
-
- if (is_error_noslot_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_GPL(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,
@@ -243,12 +147,12 @@ int kvm_mips_host_tlb_write(struct kvm_vcpu *vcpu, unsigned long entryhi,
/* Flush D-cache */
if (flush_dcache_mask) {
- if (entrylo0 & MIPS3_PG_V) {
+ if (entrylo0 & ENTRYLO_V) {
++vcpu->stat.flush_dcache_exits;
flush_data_cache_page((entryhi & VPN2_MASK) &
~flush_dcache_mask);
}
- if (entrylo1 & MIPS3_PG_V) {
+ if (entrylo1 & ENTRYLO_V) {
++vcpu->stat.flush_dcache_exits;
flush_data_cache_page(((entryhi & VPN2_MASK) &
~flush_dcache_mask) |
@@ -259,96 +163,35 @@ int kvm_mips_host_tlb_write(struct kvm_vcpu *vcpu, unsigned long entryhi,
/* 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;
- kvm_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;
- 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 | 1) >= 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];
- }
-
- 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);
-
- 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;
-}
-EXPORT_SYMBOL_GPL(kvm_mips_handle_kseg0_tlb_fault);
+EXPORT_SYMBOL_GPL(kvm_mips_host_tlb_write);
int kvm_mips_handle_commpage_tlb_fault(unsigned long badvaddr,
struct kvm_vcpu *vcpu)
{
- kvm_pfn_t pfn0, pfn1;
+ kvm_pfn_t pfn;
unsigned long flags, old_entryhi = 0, vaddr = 0;
- unsigned long entrylo0 = 0, entrylo1 = 0;
+ unsigned long entrylo[2] = { 0, 0 };
+ unsigned int pair_idx;
- 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;
+ pfn = PFN_DOWN(virt_to_phys(vcpu->arch.kseg0_commpage));
+ pair_idx = (badvaddr >> PAGE_SHIFT) & 1;
+ entrylo[pair_idx] = mips3_paddr_to_tlbpfn(pfn << PAGE_SHIFT) |
+ ((_page_cachable_default >> _CACHE_SHIFT) << ENTRYLO_C_SHIFT) |
+ ENTRYLO_D | ENTRYLO_V;
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_entrylo0(entrylo[0]);
+ write_c0_entrylo1(entrylo[1]);
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",
@@ -358,82 +201,12 @@ int kvm_mips_handle_commpage_tlb_fault(unsigned long badvaddr,
/* Restore old ASID */
write_c0_entryhi(old_entryhi);
mtc0_tlbw_hazard();
- tlbw_use_hazard();
local_irq_restore(flags);
return 0;
}
EXPORT_SYMBOL_GPL(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;
- kvm_pfn_t pfn0, pfn1;
- gfn_t gfn0, gfn1;
- long tlb_lo[2];
- int ret;
-
- tlb_lo[0] = tlb->tlb_lo0;
- tlb_lo[1] = tlb->tlb_lo1;
-
- /*
- * 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;
-
- gfn0 = mips3_tlbpfn_to_paddr(tlb_lo[0]) >> PAGE_SHIFT;
- gfn1 = mips3_tlbpfn_to_paddr(tlb_lo[1]) >> PAGE_SHIFT;
- if (gfn0 >= kvm->arch.guest_pmap_npages ||
- gfn1 >= kvm->arch.guest_pmap_npages) {
- kvm_err("%s: Invalid gfn: [%#llx, %#llx], EHi: %#lx\n",
- __func__, gfn0, gfn1, tlb->tlb_hi);
- kvm_mips_dump_guest_tlbs(vcpu);
- return -1;
- }
-
- if (kvm_mips_map_page(kvm, gfn0) < 0)
- return -1;
-
- if (kvm_mips_map_page(kvm, gfn1) < 0)
- return -1;
-
- pfn0 = kvm->arch.guest_pmap[gfn0];
- pfn1 = kvm->arch.guest_pmap[gfn1];
-
- if (hpa0)
- *hpa0 = pfn0 << PAGE_SHIFT;
-
- if (hpa1)
- *hpa1 = pfn1 << PAGE_SHIFT;
-
- /* Get attributes from the Guest TLB */
- entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) |
- (tlb_lo[0] & MIPS3_PG_D) | (tlb_lo[0] & MIPS3_PG_V);
- entrylo1 = mips3_paddr_to_tlbpfn(pfn1 << PAGE_SHIFT) | (0x3 << 3) |
- (tlb_lo[1] & MIPS3_PG_D) | (tlb_lo[1] & MIPS3_PG_V);
-
- kvm_debug("@ %#lx tlb_lo0: 0x%08lx tlb_lo1: 0x%08lx\n", vcpu->arch.pc,
- tlb->tlb_lo0, tlb->tlb_lo1);
-
- 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;
-}
-EXPORT_SYMBOL_GPL(kvm_mips_handle_mapped_seg_tlb_fault);
-
int kvm_mips_guest_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long entryhi)
{
int i;
@@ -449,7 +222,7 @@ int kvm_mips_guest_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long entryhi)
}
kvm_debug("%s: entryhi: %#lx, index: %d lo0: %#lx, lo1: %#lx\n",
- __func__, entryhi, index, tlb[i].tlb_lo0, tlb[i].tlb_lo1);
+ __func__, entryhi, index, tlb[i].tlb_lo[0], tlb[i].tlb_lo[1]);
return index;
}
@@ -481,7 +254,6 @@ int kvm_mips_host_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long vaddr)
/* Restore old ASID */
write_c0_entryhi(old_entryhi);
mtc0_tlbw_hazard();
- tlbw_use_hazard();
local_irq_restore(flags);
@@ -512,21 +284,16 @@ int kvm_mips_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long va)
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();
+ tlbw_use_hazard();
}
write_c0_entryhi(old_entryhi);
mtc0_tlbw_hazard();
- tlbw_use_hazard();
local_irq_restore(flags);
@@ -554,61 +321,39 @@ void kvm_mips_flush_host_tlb(int skip_kseg0)
/* Blast 'em all away. */
for (entry = 0; entry < maxentry; entry++) {
write_c0_index(entry);
- mtc0_tlbw_hazard();
if (skip_kseg0) {
+ mtc0_tlbr_hazard();
tlb_read();
- tlbw_use_hazard();
+ tlb_read_hazard();
entryhi = read_c0_entryhi();
/* Don't blow away guest kernel entries */
if (KVM_GUEST_KSEGX(entryhi) == KVM_GUEST_KSEG0)
continue;
+
+ write_c0_pagemask(old_pagemask);
}
/* 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();
}
- 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_GPL(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 += 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;
-}
-
void kvm_local_flush_tlb_all(void)
{
unsigned long flags;
@@ -628,191 +373,12 @@ void kvm_local_flush_tlb_all(void)
write_c0_index(entry);
mtc0_tlbw_hazard();
tlb_write_indexed();
+ tlbw_use_hazard();
entry++;
}
- tlbw_use_hazard();
write_c0_entryhi(old_ctx);
mtc0_tlbw_hazard();
local_irq_restore(flags);
}
EXPORT_SYMBOL_GPL(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 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);
-
-}
-EXPORT_SYMBOL_GPL(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(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);
-}
-EXPORT_SYMBOL_GPL(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) &
- 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();
- local_irq_restore(flags);
- return KVM_INVALID_INST;
- }
- if (kvm_mips_handle_mapped_seg_tlb_fault(vcpu,
- &vcpu->arch.guest_tlb[index],
- NULL, NULL)) {
- kvm_err("%s: handling mapped seg tlb fault failed for %p, index: %u, vcpu: %p, ASID: %#lx\n",
- __func__, opc, index, vcpu,
- read_c0_entryhi());
- kvm_mips_dump_guest_tlbs(vcpu);
- local_irq_restore(flags);
- return KVM_INVALID_INST;
- }
- 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_GPL(kvm_get_inst);
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-05 22:12:23 +0000