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KVM: MMU: store generation-number into mmio spte
Store the generation-number into bit3 ~ bit11 and bit52 ~ bit61, totally 19 bits can be used, it should be enough for nearly all most common cases In this patch, the generation-number is always 0, it will be changed in the later patch [Gleb: masking generation bits from spte in get_mmio_spte_gfn() and get_mmio_spte_access()] Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Reviewed-by: Gleb Natapov <gleb@redhat.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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@ -197,15 +197,52 @@ void kvm_mmu_set_mmio_spte_mask(u64 mmio_mask)
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}
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EXPORT_SYMBOL_GPL(kvm_mmu_set_mmio_spte_mask);
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static void mark_mmio_spte(u64 *sptep, u64 gfn, unsigned access)
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/*
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* spte bits of bit 3 ~ bit 11 are used as low 9 bits of generation number,
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* the bits of bits 52 ~ bit 61 are used as high 10 bits of generation
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* number.
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*/
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#define MMIO_SPTE_GEN_LOW_SHIFT 3
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#define MMIO_SPTE_GEN_HIGH_SHIFT 52
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#define MMIO_GEN_LOW_SHIFT 9
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#define MMIO_GEN_LOW_MASK ((1 << MMIO_GEN_LOW_SHIFT) - 1)
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#define MMIO_MAX_GEN ((1 << 19) - 1)
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static u64 generation_mmio_spte_mask(unsigned int gen)
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{
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u64 mask;
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WARN_ON(gen > MMIO_MAX_GEN);
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mask = (gen & MMIO_GEN_LOW_MASK) << MMIO_SPTE_GEN_LOW_SHIFT;
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mask |= ((u64)gen >> MMIO_GEN_LOW_SHIFT) << MMIO_SPTE_GEN_HIGH_SHIFT;
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return mask;
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}
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static unsigned int get_mmio_spte_generation(u64 spte)
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{
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unsigned int gen;
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spte &= ~shadow_mmio_mask;
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gen = (spte >> MMIO_SPTE_GEN_LOW_SHIFT) & MMIO_GEN_LOW_MASK;
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gen |= (spte >> MMIO_SPTE_GEN_HIGH_SHIFT) << MMIO_GEN_LOW_SHIFT;
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return gen;
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}
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static void mark_mmio_spte(struct kvm *kvm, u64 *sptep, u64 gfn,
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unsigned access)
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{
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struct kvm_mmu_page *sp = page_header(__pa(sptep));
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u64 mask = generation_mmio_spte_mask(0);
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access &= ACC_WRITE_MASK | ACC_USER_MASK;
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mask |= shadow_mmio_mask | access | gfn << PAGE_SHIFT;
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sp->mmio_cached = true;
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trace_mark_mmio_spte(sptep, gfn, access);
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mmu_spte_set(sptep, shadow_mmio_mask | access | gfn << PAGE_SHIFT);
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trace_mark_mmio_spte(sptep, gfn, access, 0);
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mmu_spte_set(sptep, mask);
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}
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static bool is_mmio_spte(u64 spte)
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@ -215,18 +252,21 @@ static bool is_mmio_spte(u64 spte)
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static gfn_t get_mmio_spte_gfn(u64 spte)
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{
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return (spte & ~shadow_mmio_mask) >> PAGE_SHIFT;
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u64 mask = generation_mmio_spte_mask(MMIO_MAX_GEN) | shadow_mmio_mask;
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return (spte & ~mask) >> PAGE_SHIFT;
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}
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static unsigned get_mmio_spte_access(u64 spte)
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{
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return (spte & ~shadow_mmio_mask) & ~PAGE_MASK;
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u64 mask = generation_mmio_spte_mask(MMIO_MAX_GEN) | shadow_mmio_mask;
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return (spte & ~mask) & ~PAGE_MASK;
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}
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static bool set_mmio_spte(u64 *sptep, gfn_t gfn, pfn_t pfn, unsigned access)
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static bool set_mmio_spte(struct kvm *kvm, u64 *sptep, gfn_t gfn,
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pfn_t pfn, unsigned access)
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{
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if (unlikely(is_noslot_pfn(pfn))) {
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mark_mmio_spte(sptep, gfn, access);
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mark_mmio_spte(kvm, sptep, gfn, access);
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return true;
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}
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@ -2364,7 +2404,7 @@ static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
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u64 spte;
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int ret = 0;
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if (set_mmio_spte(sptep, gfn, pfn, pte_access))
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if (set_mmio_spte(vcpu->kvm, sptep, gfn, pfn, pte_access))
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return 0;
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spte = PT_PRESENT_MASK;
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@ -3427,8 +3467,8 @@ static inline void protect_clean_gpte(unsigned *access, unsigned gpte)
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*access &= mask;
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}
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static bool sync_mmio_spte(u64 *sptep, gfn_t gfn, unsigned access,
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int *nr_present)
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static bool sync_mmio_spte(struct kvm *kvm, u64 *sptep, gfn_t gfn,
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unsigned access, int *nr_present)
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{
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if (unlikely(is_mmio_spte(*sptep))) {
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if (gfn != get_mmio_spte_gfn(*sptep)) {
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@ -3437,7 +3477,7 @@ static bool sync_mmio_spte(u64 *sptep, gfn_t gfn, unsigned access,
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}
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(*nr_present)++;
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mark_mmio_spte(sptep, gfn, access);
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mark_mmio_spte(kvm, sptep, gfn, access);
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return true;
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}
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@ -199,23 +199,25 @@ DEFINE_EVENT(kvm_mmu_page_class, kvm_mmu_prepare_zap_page,
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TRACE_EVENT(
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mark_mmio_spte,
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TP_PROTO(u64 *sptep, gfn_t gfn, unsigned access),
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TP_ARGS(sptep, gfn, access),
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TP_PROTO(u64 *sptep, gfn_t gfn, unsigned access, unsigned int gen),
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TP_ARGS(sptep, gfn, access, gen),
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TP_STRUCT__entry(
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__field(void *, sptep)
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__field(gfn_t, gfn)
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__field(unsigned, access)
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__field(unsigned int, gen)
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),
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TP_fast_assign(
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__entry->sptep = sptep;
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__entry->gfn = gfn;
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__entry->access = access;
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__entry->gen = gen;
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),
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TP_printk("sptep:%p gfn %llx access %x", __entry->sptep, __entry->gfn,
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__entry->access)
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TP_printk("sptep:%p gfn %llx access %x gen %x", __entry->sptep,
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__entry->gfn, __entry->access, __entry->gen)
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);
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TRACE_EVENT(
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@ -792,7 +792,8 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
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pte_access &= gpte_access(vcpu, gpte);
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protect_clean_gpte(&pte_access, gpte);
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if (sync_mmio_spte(&sp->spt[i], gfn, pte_access, &nr_present))
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if (sync_mmio_spte(vcpu->kvm, &sp->spt[i], gfn, pte_access,
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&nr_present))
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continue;
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if (gfn != sp->gfns[i]) {
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