linux-kernel - [PATCH 0/2] KVM: Fix mmu_notifier vs. pfncache race

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Message-Id: <20220420004859.3298837-1-seanjc@google.com>
Date:   Wed, 20 Apr 2022 00:48:57 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        David Woodhouse <dwmw@...zon.co.uk>,
        Mingwei Zhang <mizhang@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>
Subject: [PATCH 0/2] KVM: Fix mmu_notifier vs. pfncache race

Fix a race between mmu_notifier invalidation and pfncache refresh, and
then fix another race of sorts within pfncache that exists because of the
hacky approach pfncache currently employs to try and handle races with
mmu_notifiers.

Both issues were found by inspection and not proven on hardware.

Sean Christopherson (2):
  KVM: Fix race between mmu_notifier invalidation and pfncache refresh
  KVM: Do not speculatively mark pfn cache valid to "fix" race

 virt/kvm/kvm_main.c |  9 ++++++
 virt/kvm/pfncache.c | 79 +++++++++++++++++++++++++++++----------------
 2 files changed, 61 insertions(+), 27 deletions(-)


base-commit: 150866cd0ec871c765181d145aa0912628289c8a
-- 
2.36.0.rc0.470.gd361397f0d-goog