From 1487ef989591aca2ce2ef06c83fb9dd2390a0f2b Mon Sep 17 00:00:00 2001 From: Lai Jiangshan Date: Sat, 18 Sep 2021 08:56:32 +0800 Subject: [PATCH] KVM: X86: Change kvm_sync_page() to return true when remote flush is needed Currently kvm_sync_page() returns true when there is any present spte. But the return value is ignored in the callers. Changing kvm_sync_page() to return true when remote flush is needed and changing mmu->sync_page() not to directly flush can combine and reduce remote flush requests. Signed-off-by: Lai Jiangshan Signed-off-by: Paolo Bonzini Message-Id: <20210918005636.3675-7-jiangshanlai@gmail.com> Signed-off-by: Paolo Bonzini --- arch/x86/kvm/mmu/mmu.c | 21 +++++++++++++-------- arch/x86/kvm/mmu/paging_tmpl.h | 21 ++++++++++----------- 2 files changed, 23 insertions(+), 19 deletions(-) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index 443b67d94784e..34de5a8ea7dcc 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -1795,7 +1795,7 @@ static void mark_unsync(u64 *spte) static int nonpaging_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) { - return 0; + return -1; } #define KVM_PAGE_ARRAY_NR 16 @@ -1909,12 +1909,14 @@ static void kvm_mmu_commit_zap_page(struct kvm *kvm, static bool kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp, struct list_head *invalid_list) { - if (vcpu->arch.mmu->sync_page(vcpu, sp) == 0) { + int ret = vcpu->arch.mmu->sync_page(vcpu, sp); + + if (ret < 0) { kvm_mmu_prepare_zap_page(vcpu->kvm, sp, invalid_list); return false; } - return true; + return !!ret; } static bool kvm_mmu_remote_flush_or_zap(struct kvm *kvm, @@ -2024,6 +2026,7 @@ static int mmu_sync_children(struct kvm_vcpu *vcpu, struct mmu_page_path parents; struct kvm_mmu_pages pages; LIST_HEAD(invalid_list); + bool flush = false; while (mmu_unsync_walk(parent, &pages)) { bool protected = false; @@ -2033,25 +2036,27 @@ static int mmu_sync_children(struct kvm_vcpu *vcpu, if (protected) { kvm_flush_remote_tlbs(vcpu->kvm); + flush = false; } for_each_sp(pages, sp, parents, i) { kvm_unlink_unsync_page(vcpu->kvm, sp); - kvm_sync_page(vcpu, sp, &invalid_list); + flush |= kvm_sync_page(vcpu, sp, &invalid_list); mmu_pages_clear_parents(&parents); } if (need_resched() || rwlock_needbreak(&vcpu->kvm->mmu_lock)) { - kvm_mmu_remote_flush_or_zap(vcpu->kvm, &invalid_list, false); + kvm_mmu_remote_flush_or_zap(vcpu->kvm, &invalid_list, flush); if (!can_yield) { kvm_make_request(KVM_REQ_MMU_SYNC, vcpu); return -EINTR; } cond_resched_rwlock_write(&vcpu->kvm->mmu_lock); + flush = false; } } - kvm_mmu_remote_flush_or_zap(vcpu->kvm, &invalid_list, false); + kvm_mmu_remote_flush_or_zap(vcpu->kvm, &invalid_list, flush); return 0; } @@ -2135,6 +2140,7 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu, break; WARN_ON(!list_empty(&invalid_list)); + kvm_flush_remote_tlbs(vcpu->kvm); } __clear_sp_write_flooding_count(sp); @@ -4191,7 +4197,7 @@ static unsigned long get_cr3(struct kvm_vcpu *vcpu) } static bool sync_mmio_spte(struct kvm_vcpu *vcpu, u64 *sptep, gfn_t gfn, - unsigned int access, int *nr_present) + unsigned int access) { if (unlikely(is_mmio_spte(*sptep))) { if (gfn != get_mmio_spte_gfn(*sptep)) { @@ -4199,7 +4205,6 @@ static bool sync_mmio_spte(struct kvm_vcpu *vcpu, u64 *sptep, gfn_t gfn, return true; } - (*nr_present)++; mark_mmio_spte(vcpu, sptep, gfn, access); return true; } diff --git a/arch/x86/kvm/mmu/paging_tmpl.h b/arch/x86/kvm/mmu/paging_tmpl.h index 913d52a7923e6..aca40993096ec 100644 --- a/arch/x86/kvm/mmu/paging_tmpl.h +++ b/arch/x86/kvm/mmu/paging_tmpl.h @@ -1066,11 +1066,16 @@ static gpa_t FNAME(gva_to_gpa_nested)(struct kvm_vcpu *vcpu, gpa_t vaddr, * Using the cached information from sp->gfns is safe because: * - The spte has a reference to the struct page, so the pfn for a given gfn * can't change unless all sptes pointing to it are nuked first. + * + * Returns + * < 0: the sp should be zapped + * 0: the sp is synced and no tlb flushing is required + * > 0: the sp is synced and tlb flushing is required */ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) { union kvm_mmu_page_role mmu_role = vcpu->arch.mmu->mmu_role.base; - int i, nr_present = 0; + int i; bool host_writable; gpa_t first_pte_gpa; int set_spte_ret = 0; @@ -1098,7 +1103,7 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) */ if (WARN_ON_ONCE(sp->role.direct || (sp->role.word ^ mmu_role.word) & ~sync_role_ign.word)) - return 0; + return -1; first_pte_gpa = FNAME(get_level1_sp_gpa)(sp); @@ -1115,7 +1120,7 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) if (kvm_vcpu_read_guest_atomic(vcpu, pte_gpa, &gpte, sizeof(pt_element_t))) - return 0; + return -1; if (FNAME(prefetch_invalid_gpte)(vcpu, sp, &sp->spt[i], gpte)) { set_spte_ret |= SET_SPTE_NEED_REMOTE_TLB_FLUSH; @@ -1127,8 +1132,7 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) pte_access &= FNAME(gpte_access)(gpte); FNAME(protect_clean_gpte)(vcpu->arch.mmu, &pte_access, gpte); - if (sync_mmio_spte(vcpu, &sp->spt[i], gfn, pte_access, - &nr_present)) + if (sync_mmio_spte(vcpu, &sp->spt[i], gfn, pte_access)) continue; if (gfn != sp->gfns[i]) { @@ -1137,8 +1141,6 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) continue; } - nr_present++; - host_writable = sp->spt[i] & shadow_host_writable_mask; set_spte_ret |= set_spte(vcpu, &sp->spt[i], @@ -1147,10 +1149,7 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) true, false, host_writable); } - if (set_spte_ret & SET_SPTE_NEED_REMOTE_TLB_FLUSH) - kvm_flush_remote_tlbs(vcpu->kvm); - - return nr_present; + return set_spte_ret & SET_SPTE_NEED_REMOTE_TLB_FLUSH; } #undef pt_element_t -- 2.39.5