From: Paolo Bonzini <pbonzini@redhat.com>
To: Ben Gardon <bgardon@google.com>,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: 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>
Subject: Re: [PATCH 06/15] KVM: x86/mmu: Remove need for a vcpu from mmu_try_to_unsync_pages
Date: Thu, 18 Nov 2021 09:25:59 +0100 [thread overview]
Message-ID: <7b8ca1df-f599-100b-aebe-9b6be7532b4e@redhat.com> (raw)
In-Reply-To: <20211115234603.2908381-7-bgardon@google.com>
On 11/16/21 00:45, Ben Gardon wrote:
> The vCPU argument to mmu_try_to_unsync_pages is now only used to get a
> pointer to the associated struct kvm, so pass in the kvm pointer from
> the beginning to remove the need for a vCPU when calling the function.
>
>
> Signed-off-by: Ben Gardon <bgardon@google.com>
> ---
> arch/x86/kvm/mmu/mmu.c | 16 ++++++++--------
> arch/x86/kvm/mmu/mmu_internal.h | 2 +-
> arch/x86/kvm/mmu/spte.c | 2 +-
> 3 files changed, 10 insertions(+), 10 deletions(-)
>
> diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
> index 7d0da79668c0..1e890509b93f 100644
> --- a/arch/x86/kvm/mmu/mmu.c
> +++ b/arch/x86/kvm/mmu/mmu.c
> @@ -2561,10 +2561,10 @@ static int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva)
> return r;
> }
>
> -static void kvm_unsync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
> +static void kvm_unsync_page(struct kvm *kvm, struct kvm_mmu_page *sp)
> {
> trace_kvm_mmu_unsync_page(sp);
> - ++vcpu->kvm->stat.mmu_unsync;
> + ++kvm->stat.mmu_unsync;
> sp->unsync = 1;
>
> kvm_mmu_mark_parents_unsync(sp);
> @@ -2576,7 +2576,7 @@ static void kvm_unsync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
> * were marked unsync (or if there is no shadow page), -EPERM if the SPTE must
> * be write-protected.
> */
> -int mmu_try_to_unsync_pages(struct kvm_vcpu *vcpu, struct kvm_memory_slot *slot,
> +int mmu_try_to_unsync_pages(struct kvm *kvm, struct kvm_memory_slot *slot,
> gfn_t gfn, bool can_unsync, bool prefetch)
> {
> struct kvm_mmu_page *sp;
> @@ -2587,7 +2587,7 @@ int mmu_try_to_unsync_pages(struct kvm_vcpu *vcpu, struct kvm_memory_slot *slot,
> * track machinery is used to write-protect upper-level shadow pages,
> * i.e. this guards the role.level == 4K assertion below!
> */
> - if (kvm_slot_page_track_is_active(vcpu->kvm, slot, gfn, KVM_PAGE_TRACK_WRITE))
> + if (kvm_slot_page_track_is_active(kvm, slot, gfn, KVM_PAGE_TRACK_WRITE))
> return -EPERM;
>
> /*
> @@ -2596,7 +2596,7 @@ int mmu_try_to_unsync_pages(struct kvm_vcpu *vcpu, struct kvm_memory_slot *slot,
> * that case, KVM must complete emulation of the guest TLB flush before
> * allowing shadow pages to become unsync (writable by the guest).
> */
> - for_each_gfn_indirect_valid_sp(vcpu->kvm, sp, gfn) {
> + for_each_gfn_indirect_valid_sp(kvm, sp, gfn) {
> if (!can_unsync)
> return -EPERM;
>
> @@ -2615,7 +2615,7 @@ int mmu_try_to_unsync_pages(struct kvm_vcpu *vcpu, struct kvm_memory_slot *slot,
> */
> if (!locked) {
> locked = true;
> - spin_lock(&vcpu->kvm->arch.mmu_unsync_pages_lock);
> + spin_lock(&kvm->arch.mmu_unsync_pages_lock);
>
> /*
> * Recheck after taking the spinlock, a different vCPU
> @@ -2630,10 +2630,10 @@ int mmu_try_to_unsync_pages(struct kvm_vcpu *vcpu, struct kvm_memory_slot *slot,
> }
>
> WARN_ON(sp->role.level != PG_LEVEL_4K);
> - kvm_unsync_page(vcpu, sp);
> + kvm_unsync_page(kvm, sp);
> }
> if (locked)
> - spin_unlock(&vcpu->kvm->arch.mmu_unsync_pages_lock);
> + spin_unlock(&kvm->arch.mmu_unsync_pages_lock);
>
> /*
> * We need to ensure that the marking of unsync pages is visible
> diff --git a/arch/x86/kvm/mmu/mmu_internal.h b/arch/x86/kvm/mmu/mmu_internal.h
> index 52c6527b1a06..1073d10cce91 100644
> --- a/arch/x86/kvm/mmu/mmu_internal.h
> +++ b/arch/x86/kvm/mmu/mmu_internal.h
> @@ -118,7 +118,7 @@ static inline bool kvm_vcpu_ad_need_write_protect(struct kvm_vcpu *vcpu)
> kvm_x86_ops.cpu_dirty_log_size;
> }
>
> -int mmu_try_to_unsync_pages(struct kvm_vcpu *vcpu, struct kvm_memory_slot *slot,
> +int mmu_try_to_unsync_pages(struct kvm *kvm, struct kvm_memory_slot *slot,
> gfn_t gfn, bool can_unsync, bool prefetch);
>
> void kvm_mmu_gfn_disallow_lpage(const struct kvm_memory_slot *slot, gfn_t gfn);
> diff --git a/arch/x86/kvm/mmu/spte.c b/arch/x86/kvm/mmu/spte.c
> index 75c666d3e7f1..b7271daa06c5 100644
> --- a/arch/x86/kvm/mmu/spte.c
> +++ b/arch/x86/kvm/mmu/spte.c
> @@ -160,7 +160,7 @@ bool make_spte(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
> * e.g. it's write-tracked (upper-level SPs) or has one or more
> * shadow pages and unsync'ing pages is not allowed.
> */
> - if (mmu_try_to_unsync_pages(vcpu, slot, gfn, can_unsync, prefetch)) {
> + if (mmu_try_to_unsync_pages(vcpu->kvm, slot, gfn, can_unsync, prefetch)) {
> pgprintk("%s: found shadow page for %llx, marking ro\n",
> __func__, gfn);
> wrprot = true;
>
Queued, thanks.
Paolo
next prev parent reply other threads:[~2021-11-18 8:26 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 ` [PATCH 03/15] KVM: x86/mmu: Factor wrprot for nested PML out of make_spte Ben Gardon
2021-11-15 23:45 ` [PATCH 04/15] KVM: x86/mmu: Factor mt_mask " 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 [this message]
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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