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-rw-r--r--arch/powerpc/include/asm/kvm_host.h21
-rw-r--r--arch/powerpc/kvm/book3s_64_mmu_hv.c16
-rw-r--r--arch/powerpc/kvm/book3s_hv.c9
-rw-r--r--arch/powerpc/kvm/book3s_hv_rm_mmu.c117
4 files changed, 144 insertions, 19 deletions
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 28350a294b1e..20ef27d09d05 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -246,6 +246,7 @@ struct kvm_arch {
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
unsigned long hpt_virt;
struct revmap_entry *revmap;
+ atomic64_t mmio_update;
unsigned int host_lpid;
unsigned long host_lpcr;
unsigned long sdr1;
@@ -408,6 +409,24 @@ struct kvmppc_passthru_irqmap {
#define KVMPPC_IRQ_MPIC 1
#define KVMPPC_IRQ_XICS 2
+#define MMIO_HPTE_CACHE_SIZE 4
+
+struct mmio_hpte_cache_entry {
+ unsigned long hpte_v;
+ unsigned long hpte_r;
+ unsigned long rpte;
+ unsigned long pte_index;
+ unsigned long eaddr;
+ unsigned long slb_v;
+ long mmio_update;
+ unsigned int slb_base_pshift;
+};
+
+struct mmio_hpte_cache {
+ struct mmio_hpte_cache_entry entry[MMIO_HPTE_CACHE_SIZE];
+ unsigned int index;
+};
+
struct openpic;
struct kvm_vcpu_arch {
@@ -655,9 +674,11 @@ struct kvm_vcpu_arch {
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
struct kvm_vcpu_arch_shared shregs;
+ struct mmio_hpte_cache mmio_cache;
unsigned long pgfault_addr;
long pgfault_index;
unsigned long pgfault_hpte[2];
+ struct mmio_hpte_cache_entry *pgfault_cache;
struct task_struct *run_task;
struct kvm_run *kvm_run;
diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c
index 33a7d1f9167b..564ae8aa1961 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_hv.c
+++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c
@@ -88,6 +88,8 @@ long kvmppc_alloc_hpt(struct kvm *kvm, u32 *htab_orderp)
/* 128 (2**7) bytes in each HPTEG */
kvm->arch.hpt_mask = (1ul << (order - 7)) - 1;
+ atomic64_set(&kvm->arch.mmio_update, 0);
+
/* Allocate reverse map array */
rev = vmalloc(sizeof(struct revmap_entry) * kvm->arch.hpt_npte);
if (!rev) {
@@ -451,6 +453,7 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu,
unsigned int writing, write_ok;
struct vm_area_struct *vma;
unsigned long rcbits;
+ long mmio_update;
/*
* Real-mode code has already searched the HPT and found the
@@ -460,6 +463,19 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu,
*/
if (ea != vcpu->arch.pgfault_addr)
return RESUME_GUEST;
+
+ if (vcpu->arch.pgfault_cache) {
+ mmio_update = atomic64_read(&kvm->arch.mmio_update);
+ if (mmio_update == vcpu->arch.pgfault_cache->mmio_update) {
+ r = vcpu->arch.pgfault_cache->rpte;
+ psize = hpte_page_size(vcpu->arch.pgfault_hpte[0], r);
+ gpa_base = r & HPTE_R_RPN & ~(psize - 1);
+ gfn_base = gpa_base >> PAGE_SHIFT;
+ gpa = gpa_base | (ea & (psize - 1));
+ return kvmppc_hv_emulate_mmio(run, vcpu, gpa, ea,
+ dsisr & DSISR_ISSTORE);
+ }
+ }
index = vcpu->arch.pgfault_index;
hptep = (__be64 *)(kvm->arch.hpt_virt + (index << 4));
rev = &kvm->arch.revmap[index];
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 415943198e0f..320a7981c906 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -2970,6 +2970,15 @@ static void kvmppc_core_commit_memory_region_hv(struct kvm *kvm,
struct kvm_memslots *slots;
struct kvm_memory_slot *memslot;
+ /*
+ * If we are making a new memslot, it might make
+ * some address that was previously cached as emulated
+ * MMIO be no longer emulated MMIO, so invalidate
+ * all the caches of emulated MMIO translations.
+ */
+ if (npages)
+ atomic64_inc(&kvm->arch.mmio_update);
+
if (npages && old->npages) {
/*
* If modifying a memslot, reset all the rmap dirty bits.
diff --git a/arch/powerpc/kvm/book3s_hv_rm_mmu.c b/arch/powerpc/kvm/book3s_hv_rm_mmu.c
index e960c831fd15..65902e94f4bd 100644
--- a/arch/powerpc/kvm/book3s_hv_rm_mmu.c
+++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c
@@ -390,6 +390,13 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags,
#define LOCK_TOKEN (*(u32 *)(&get_paca()->paca_index))
#endif
+static inline int is_mmio_hpte(unsigned long v, unsigned long r)
+{
+ return ((v & HPTE_V_ABSENT) &&
+ (r & (HPTE_R_KEY_HI | HPTE_R_KEY_LO)) ==
+ (HPTE_R_KEY_HI | HPTE_R_KEY_LO));
+}
+
static inline int try_lock_tlbie(unsigned int *lock)
{
unsigned int tmp, old;
@@ -456,6 +463,7 @@ long kvmppc_do_h_remove(struct kvm *kvm, unsigned long flags,
rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]);
v = pte & ~HPTE_V_HVLOCK;
+ pte = be64_to_cpu(hpte[1]);
if (v & HPTE_V_VALID) {
hpte[0] &= ~cpu_to_be64(HPTE_V_VALID);
rb = compute_tlbie_rb(v, be64_to_cpu(hpte[1]), pte_index);
@@ -476,6 +484,9 @@ long kvmppc_do_h_remove(struct kvm *kvm, unsigned long flags,
note_hpte_modification(kvm, rev);
unlock_hpte(hpte, 0);
+ if (is_mmio_hpte(v, pte))
+ atomic64_inc(&kvm->arch.mmio_update);
+
if (v & HPTE_V_ABSENT)
v = (v & ~HPTE_V_ABSENT) | HPTE_V_VALID;
hpret[0] = v;
@@ -502,7 +513,7 @@ long kvmppc_h_bulk_remove(struct kvm_vcpu *vcpu)
int global;
long int ret = H_SUCCESS;
struct revmap_entry *rev, *revs[4];
- u64 hp0;
+ u64 hp0, hp1;
global = global_invalidates(kvm, 0);
for (i = 0; i < 4 && ret == H_SUCCESS; ) {
@@ -535,6 +546,7 @@ long kvmppc_h_bulk_remove(struct kvm_vcpu *vcpu)
}
found = 0;
hp0 = be64_to_cpu(hp[0]);
+ hp1 = be64_to_cpu(hp[1]);
if (hp0 & (HPTE_V_ABSENT | HPTE_V_VALID)) {
switch (flags & 3) {
case 0: /* absolute */
@@ -565,6 +577,8 @@ long kvmppc_h_bulk_remove(struct kvm_vcpu *vcpu)
rcbits = rev->guest_rpte & (HPTE_R_R|HPTE_R_C);
args[j] |= rcbits << (56 - 5);
hp[0] = 0;
+ if (is_mmio_hpte(hp0, hp1))
+ atomic64_inc(&kvm->arch.mmio_update);
continue;
}
@@ -625,6 +639,7 @@ long kvmppc_h_protect(struct kvm_vcpu *vcpu, unsigned long flags,
}
v = pte;
+ pte = be64_to_cpu(hpte[1]);
bits = (flags << 55) & HPTE_R_PP0;
bits |= (flags << 48) & HPTE_R_KEY_HI;
bits |= flags & (HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_LO);
@@ -646,7 +661,6 @@ long kvmppc_h_protect(struct kvm_vcpu *vcpu, unsigned long flags,
* readonly to writable. If it should be writable, we'll
* take a trap and let the page fault code sort it out.
*/
- pte = be64_to_cpu(hpte[1]);
r = (pte & ~mask) | bits;
if (hpte_is_writable(r) && !hpte_is_writable(pte))
r = hpte_make_readonly(r);
@@ -662,6 +676,9 @@ long kvmppc_h_protect(struct kvm_vcpu *vcpu, unsigned long flags,
}
unlock_hpte(hpte, v & ~HPTE_V_HVLOCK);
asm volatile("ptesync" : : : "memory");
+ if (is_mmio_hpte(v, pte))
+ atomic64_inc(&kvm->arch.mmio_update);
+
return H_SUCCESS;
}
@@ -832,6 +849,37 @@ static int slb_base_page_shift[4] = {
20, /* 1M, unsupported */
};
+static struct mmio_hpte_cache_entry *mmio_cache_search(struct kvm_vcpu *vcpu,
+ unsigned long eaddr, unsigned long slb_v, long mmio_update)
+{
+ struct mmio_hpte_cache_entry *entry = NULL;
+ unsigned int pshift;
+ unsigned int i;
+
+ for (i = 0; i < MMIO_HPTE_CACHE_SIZE; i++) {
+ entry = &vcpu->arch.mmio_cache.entry[i];
+ if (entry->mmio_update == mmio_update) {
+ pshift = entry->slb_base_pshift;
+ if ((entry->eaddr >> pshift) == (eaddr >> pshift) &&
+ entry->slb_v == slb_v)
+ return entry;
+ }
+ }
+ return NULL;
+}
+
+static struct mmio_hpte_cache_entry *
+ next_mmio_cache_entry(struct kvm_vcpu *vcpu)
+{
+ unsigned int index = vcpu->arch.mmio_cache.index;
+
+ vcpu->arch.mmio_cache.index++;
+ if (vcpu->arch.mmio_cache.index == MMIO_HPTE_CACHE_SIZE)
+ vcpu->arch.mmio_cache.index = 0;
+
+ return &vcpu->arch.mmio_cache.entry[index];
+}
+
/* When called from virtmode, this func should be protected by
* preempt_disable(), otherwise, the holding of HPTE_V_HVLOCK
* can trigger deadlock issue.
@@ -933,25 +981,36 @@ long kvmppc_hpte_hv_fault(struct kvm_vcpu *vcpu, unsigned long addr,
unsigned long valid;
struct revmap_entry *rev;
unsigned long pp, key;
+ struct mmio_hpte_cache_entry *cache_entry = NULL;
+ long mmio_update = 0;
/* For protection fault, expect to find a valid HPTE */
valid = HPTE_V_VALID;
- if (status & DSISR_NOHPTE)
+ if (status & DSISR_NOHPTE) {
valid |= HPTE_V_ABSENT;
-
- index = kvmppc_hv_find_lock_hpte(kvm, addr, slb_v, valid);
- if (index < 0) {
- if (status & DSISR_NOHPTE)
- return status; /* there really was no HPTE */
- return 0; /* for prot fault, HPTE disappeared */
+ mmio_update = atomic64_read(&kvm->arch.mmio_update);
+ cache_entry = mmio_cache_search(vcpu, addr, slb_v, mmio_update);
}
- hpte = (__be64 *)(kvm->arch.hpt_virt + (index << 4));
- v = be64_to_cpu(hpte[0]) & ~HPTE_V_HVLOCK;
- r = be64_to_cpu(hpte[1]);
- rev = real_vmalloc_addr(&kvm->arch.revmap[index]);
- gr = rev->guest_rpte;
+ if (cache_entry) {
+ index = cache_entry->pte_index;
+ v = cache_entry->hpte_v;
+ r = cache_entry->hpte_r;
+ gr = cache_entry->rpte;
+ } else {
+ index = kvmppc_hv_find_lock_hpte(kvm, addr, slb_v, valid);
+ if (index < 0) {
+ if (status & DSISR_NOHPTE)
+ return status; /* there really was no HPTE */
+ return 0; /* for prot fault, HPTE disappeared */
+ }
+ hpte = (__be64 *)(kvm->arch.hpt_virt + (index << 4));
+ v = be64_to_cpu(hpte[0]) & ~HPTE_V_HVLOCK;
+ r = be64_to_cpu(hpte[1]);
+ rev = real_vmalloc_addr(&kvm->arch.revmap[index]);
+ gr = rev->guest_rpte;
- unlock_hpte(hpte, v);
+ unlock_hpte(hpte, v);
+ }
/* For not found, if the HPTE is valid by now, retry the instruction */
if ((status & DSISR_NOHPTE) && (v & HPTE_V_VALID))
@@ -989,12 +1048,32 @@ long kvmppc_hpte_hv_fault(struct kvm_vcpu *vcpu, unsigned long addr,
vcpu->arch.pgfault_index = index;
vcpu->arch.pgfault_hpte[0] = v;
vcpu->arch.pgfault_hpte[1] = r;
+ vcpu->arch.pgfault_cache = cache_entry;
/* Check the storage key to see if it is possibly emulated MMIO */
- if (data && (vcpu->arch.shregs.msr & MSR_IR) &&
- (r & (HPTE_R_KEY_HI | HPTE_R_KEY_LO)) ==
- (HPTE_R_KEY_HI | HPTE_R_KEY_LO))
- return -2; /* MMIO emulation - load instr word */
+ if ((r & (HPTE_R_KEY_HI | HPTE_R_KEY_LO)) ==
+ (HPTE_R_KEY_HI | HPTE_R_KEY_LO)) {
+ if (!cache_entry) {
+ unsigned int pshift = 12;
+ unsigned int pshift_index;
+
+ if (slb_v & SLB_VSID_L) {
+ pshift_index = ((slb_v & SLB_VSID_LP) >> 4);
+ pshift = slb_base_page_shift[pshift_index];
+ }
+ cache_entry = next_mmio_cache_entry(vcpu);
+ cache_entry->eaddr = addr;
+ cache_entry->slb_base_pshift = pshift;
+ cache_entry->pte_index = index;
+ cache_entry->hpte_v = v;
+ cache_entry->hpte_r = r;
+ cache_entry->rpte = gr;
+ cache_entry->slb_v = slb_v;
+ cache_entry->mmio_update = mmio_update;
+ }
+ if (data && (vcpu->arch.shregs.msr & MSR_IR))
+ return -2; /* MMIO emulation - load instr word */
+ }
return -1; /* send fault up to host kernel mode */
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-28 12:36:02 +0100