From: Sean Christopherson <seanjc@google.com>
To: Mingwei Zhang <mizhang@google.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Ben Gardon <bgardon@google.com>,
Jing Zhang <jingzhangos@google.com>
Subject: Re: [PATCH v2 1/3] KVM: x86/mmu: Remove redundant spte present check in mmu_set_spte
Date: Thu, 29 Jul 2021 18:16:52 +0000 [thread overview]
Message-ID: <YQLwlP2aW8aarqNM@google.com> (raw)
In-Reply-To: <20210726175357.1572951-2-mizhang@google.com>
On Mon, Jul 26, 2021, Mingwei Zhang wrote:
> Drop an unnecessary is_shadow_present_pte() check when updating the rmaps
> after installing a non-MMIO SPTE. set_spte() is used only to create
> shadow-present SPTEs, e.g. MMIO SPTEs are handled early on, mmu_set_spte()
> runs with mmu_lock held for write, i.e. the SPTE can't be zapped between
> writing the SPTE and updating the rmaps.
>
> Opportunistically combine the "new SPTE" logic for large pages and rmaps.
>
> No functional change intended.
>
> Suggested-by: Ben Gardon <bgardon@google.com>
> Signed-off-by: Mingwei Zhang <mizhang@google.com>
> ---
Reviewed-by: Sean Christopherson <seanjc@google.com>
next prev parent reply other threads:[~2021-07-29 18:17 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-26 17:53 [PATCH v2 0/3] Add detailed page size stats in KVM stats Mingwei Zhang
2021-07-26 17:53 ` [PATCH v2 1/3] KVM: x86/mmu: Remove redundant spte present check in mmu_set_spte Mingwei Zhang
2021-07-26 20:23 ` Ben Gardon
2021-07-29 18:16 ` Sean Christopherson [this message]
2021-07-26 17:53 ` [PATCH v2 2/3] KVM: x86/mmu: Avoid collision with !PRESENT SPTEs in TDP MMU lpage stats Mingwei Zhang
2021-07-26 21:02 ` Ben Gardon
2021-07-29 18:34 ` Sean Christopherson
2021-07-29 19:01 ` Mingwei Zhang
2021-07-26 17:53 ` [PATCH v2 3/3] KVM: x86/mmu: Add detailed page size stats Mingwei Zhang
2021-07-26 20:41 ` Ben Gardon
2021-07-26 21:06 ` Ben Gardon
2021-07-29 18:45 ` Sean Christopherson
2021-07-29 19:02 ` Mingwei Zhang
2021-07-27 15:36 ` David Matlack
2021-07-29 6:24 ` Mingwei Zhang
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