From 09072daf37abbfe8e2d5018dd913f229c76190f7 Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Tue, 1 May 2007 14:16:52 +0300 Subject: [PATCH] KVM: Unify kvm_mmu_pre_write() and kvm_mmu_post_write() Instead of calling two functions and repeating expensive checks, call one function and provide it with before/after information. Signed-off-by: Avi Kivity --- drivers/kvm/kvm.h | 4 ++-- drivers/kvm/kvm_main.c | 4 ++-- drivers/kvm/mmu.c | 11 ++++------- 3 files changed, 8 insertions(+), 11 deletions(-) diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h index 7facebd191..11c519e808 100644 --- a/drivers/kvm/kvm.h +++ b/drivers/kvm/kvm.h @@ -525,8 +525,8 @@ int kvm_write_guest(struct kvm_vcpu *vcpu, unsigned long segment_base(u16 selector); -void kvm_mmu_pre_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes); -void kvm_mmu_post_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes); +void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, + const u8 *old, const u8 *new, int bytes); int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva); void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu); diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index 7d68258642..b6ad9c6f2e 100644 --- a/drivers/kvm/kvm_main.c +++ b/drivers/kvm/kvm_main.c @@ -1071,18 +1071,18 @@ static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa, { struct page *page; void *virt; + unsigned offset = offset_in_page(gpa); if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT)) return 0; page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT); if (!page) return 0; - kvm_mmu_pre_write(vcpu, gpa, bytes); mark_page_dirty(vcpu->kvm, gpa >> PAGE_SHIFT); virt = kmap_atomic(page, KM_USER0); + kvm_mmu_pte_write(vcpu, gpa, virt + offset, val, bytes); memcpy(virt + offset_in_page(gpa), val, bytes); kunmap_atomic(virt, KM_USER0); - kvm_mmu_post_write(vcpu, gpa, bytes); return 1; } diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c index 2277b7cd11..b3a83ef2cf 100644 --- a/drivers/kvm/mmu.c +++ b/drivers/kvm/mmu.c @@ -1118,7 +1118,7 @@ out: return r; } -static void mmu_pre_write_zap_pte(struct kvm_vcpu *vcpu, +static void mmu_pte_write_zap_pte(struct kvm_vcpu *vcpu, struct kvm_mmu_page *page, u64 *spte) { @@ -1137,7 +1137,8 @@ static void mmu_pre_write_zap_pte(struct kvm_vcpu *vcpu, *spte = 0; } -void kvm_mmu_pre_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes) +void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, + const u8 *old, const u8 *new, int bytes) { gfn_t gfn = gpa >> PAGE_SHIFT; struct kvm_mmu_page *page; @@ -1206,16 +1207,12 @@ void kvm_mmu_pre_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes) spte = __va(page->page_hpa); spte += page_offset / sizeof(*spte); while (npte--) { - mmu_pre_write_zap_pte(vcpu, page, spte); + mmu_pte_write_zap_pte(vcpu, page, spte); ++spte; } } } -void kvm_mmu_post_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes) -{ -} - int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva) { gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, gva); -- 2.39.5