From: Ben Gardon <bgardon@google.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: Paolo Bonzini <pbonzini@redhat.com>, Peter Xu <peterx@redhat.com>,
Sean Christopherson <seanjc@google.com>,
Peter Shier <pshier@google.com>,
David Matlack <dmatlack@google.com>,
Mingwei Zhang <mizhang@google.com>,
Yulei Zhang <yulei.kernel@gmail.com>,
Wanpeng Li <kernellwp@gmail.com>,
Xiao Guangrong <xiaoguangrong.eric@gmail.com>,
Kai Huang <kai.huang@intel.com>,
Keqian Zhu <zhukeqian1@huawei.com>,
David Hildenbrand <david@redhat.com>,
Ben Gardon <bgardon@google.com>
Subject: [PATCH 03/15] KVM: x86/mmu: Factor wrprot for nested PML out of make_spte
Date: Mon, 15 Nov 2021 15:45:51 -0800 [thread overview]
Message-ID: <20211115234603.2908381-4-bgardon@google.com> (raw)
In-Reply-To: <20211115234603.2908381-1-bgardon@google.com>
When running a nested VM, KVM write protects SPTEs in the EPT/NPT02
instead of using PML for dirty tracking. This avoids expensive
translation later, when emptying the Page Modification Log. In service
of removing the vCPU pointer from make_spte, factor the check for nested
PML out of the function.
Signed-off-by: Ben Gardon <bgardon@google.com>
---
arch/x86/kvm/mmu/spte.c | 10 +++++++---
arch/x86/kvm/mmu/spte.h | 3 ++-
2 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kvm/mmu/spte.c b/arch/x86/kvm/mmu/spte.c
index 04d26e913941..3cf08a534a16 100644
--- a/arch/x86/kvm/mmu/spte.c
+++ b/arch/x86/kvm/mmu/spte.c
@@ -92,7 +92,8 @@ static bool kvm_is_mmio_pfn(kvm_pfn_t pfn)
bool make_spte(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
struct kvm_memory_slot *slot, unsigned int pte_access,
gfn_t gfn, kvm_pfn_t pfn, u64 old_spte, bool prefetch,
- bool can_unsync, bool host_writable, u64 *new_spte)
+ bool can_unsync, bool host_writable, bool ad_need_write_protect,
+ u64 *new_spte)
{
int level = sp->role.level;
u64 spte = SPTE_MMU_PRESENT_MASK;
@@ -100,7 +101,7 @@ bool make_spte(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
if (sp->role.ad_disabled)
spte |= SPTE_TDP_AD_DISABLED_MASK;
- else if (kvm_vcpu_ad_need_write_protect(vcpu))
+ else if (ad_need_write_protect)
spte |= SPTE_TDP_AD_WRPROT_ONLY_MASK;
/*
@@ -195,8 +196,11 @@ bool vcpu_make_spte(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
gfn_t gfn, kvm_pfn_t pfn, u64 old_spte, bool prefetch,
bool can_unsync, bool host_writable, u64 *new_spte)
{
+ bool ad_need_write_protect = kvm_vcpu_ad_need_write_protect(vcpu);
+
return make_spte(vcpu, sp, slot, pte_access, gfn, pfn, old_spte,
- prefetch, can_unsync, host_writable, new_spte);
+ prefetch, can_unsync, host_writable,
+ ad_need_write_protect, new_spte);
}
diff --git a/arch/x86/kvm/mmu/spte.h b/arch/x86/kvm/mmu/spte.h
index 14f18082d505..bcf58602f224 100644
--- a/arch/x86/kvm/mmu/spte.h
+++ b/arch/x86/kvm/mmu/spte.h
@@ -332,7 +332,8 @@ static inline u64 get_mmio_spte_generation(u64 spte)
bool make_spte(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
struct kvm_memory_slot *slot, unsigned int pte_access,
gfn_t gfn, kvm_pfn_t pfn, u64 old_spte, bool prefetch,
- bool can_unsync, bool host_writable, u64 *new_spte);
+ bool can_unsync, bool host_writable, bool ad_need_write_protect,
+ u64 *new_spte);
bool vcpu_make_spte(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
struct kvm_memory_slot *slot,
unsigned int pte_access, gfn_t gfn, kvm_pfn_t pfn,
--
2.34.0.rc1.387.gb447b232ab-goog
next prev parent reply other threads:[~2021-11-16 3:16 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-15 23:45 [PATCH 00/15] Currently disabling dirty logging with the TDP MMU is extremely slow. On a 96 vCPU / 96G VM it takes ~45 seconds to disable dirty logging with the TDP MMU, as opposed to ~3.5 seconds with the legacy MMU. This series optimizes TLB flushes and introduces in-place large page promotion, to bring the disable dirty log time down to ~2 seconds Ben Gardon
2021-11-15 23:45 ` [PATCH 01/15] KVM: x86/mmu: Remove redundant flushes when disabling dirty logging Ben Gardon
2021-11-18 8:26 ` Paolo Bonzini
2021-11-15 23:45 ` [PATCH 02/15] KVM: x86/mmu: Introduce vcpu_make_spte Ben Gardon
2021-11-15 23:45 ` Ben Gardon [this message]
2021-11-15 23:45 ` [PATCH 04/15] KVM: x86/mmu: Factor mt_mask out of make_spte Ben Gardon
2021-11-15 23:45 ` [PATCH 05/15] KVM: x86/mmu: Remove need for a vcpu from kvm_slot_page_track_is_active Ben Gardon
2021-11-18 8:25 ` Paolo Bonzini
2021-11-15 23:45 ` [PATCH 06/15] KVM: x86/mmu: Remove need for a vcpu from mmu_try_to_unsync_pages Ben Gardon
2021-11-18 8:25 ` Paolo Bonzini
2021-11-15 23:45 ` [PATCH 07/15] KVM: x86/mmu: Factor shadow_zero_check out of make_spte Ben Gardon
2021-11-15 23:45 ` [PATCH 08/15] KVM: x86/mmu: Replace vcpu argument with kvm pointer in make_spte Ben Gardon
2021-11-15 23:45 ` [PATCH 09/15] KVM: x86/mmu: Factor out the meat of reset_tdp_shadow_zero_bits_mask Ben Gardon
2021-11-15 23:45 ` [PATCH 10/15] KVM: x86/mmu: Propagate memslot const qualifier Ben Gardon
2021-11-18 8:27 ` Paolo Bonzini
2021-11-15 23:45 ` [PATCH 11/15] KVM: x86/MMU: Refactor vmx_get_mt_mask Ben Gardon
2021-11-18 8:30 ` Paolo Bonzini
2021-11-18 15:30 ` Sean Christopherson
2021-11-19 9:02 ` Paolo Bonzini
2021-11-22 18:11 ` Ben Gardon
2021-11-22 18:46 ` Sean Christopherson
2021-11-15 23:46 ` [PATCH 12/15] KVM: x86/mmu: Factor out part of vmx_get_mt_mask which does not depend on vcpu Ben Gardon
2021-11-15 23:46 ` [PATCH 13/15] KVM: x86/mmu: Add try_get_mt_mask to x86_ops Ben Gardon
2021-11-15 23:46 ` [PATCH 14/15] KVM: x86/mmu: Make kvm_is_mmio_pfn usable outside of spte.c Ben Gardon
2021-11-15 23:46 ` [PATCH 15/15] KVM: x86/mmu: Promote pages in-place when disabling dirty logging Ben Gardon
2021-11-25 4:18 ` Peter Xu
2021-11-29 18:31 ` Ben Gardon
2021-11-30 0:13 ` Sean Christopherson
2021-11-30 7:28 ` Peter Xu
2021-11-30 16:01 ` Sean Christopherson
2021-12-01 1:59 ` Peter Xu
2021-11-15 23:58 ` [PATCH 00/15] Currently disabling dirty logging with the TDP MMU is extremely slow. On a 96 vCPU / 96G VM it takes ~45 seconds to disable dirty logging with the TDP MMU, as opposed to ~3.5 seconds with the legacy MMU. This series optimizes TLB flushes and introduces in-place large page promotion, to bring the disable dirty log time down to ~2 seconds Ben Gardon
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