linux-kernel - [PATCH 0/4] KVM: x86/mmu: Page fault handling cleanups

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Date:   Wed, 23 Sep 2020 15:04:21 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Kai Huang <kai.huang@...el.com>
Subject: [PATCH 0/4] KVM: x86/mmu: Page fault handling cleanups

Cleanups for page fault handling that were encountered during early TDX
enabling, but are worthwhile on their own.  Specifically, patch 4 fixes an
issue where KVM doesn't detect a spurious page fault (due to the fault
being fixed by a different pCPU+vCPU) and does the full gamut of writing
the SPTE, updating stats, and prefetching SPTEs.

Sean Christopherson (4):
  KVM: x86/mmu: Return -EIO if page fault returns RET_PF_INVALID
  KVM: x86/mmu: Invert RET_PF_* check when falling through to emulation
  KVM: x86/mmu: Return unique RET_PF_* values if the fault was fixed
  KVM: x86/mmu: Bail early from final #PF handling on spurious faults

 arch/x86/kvm/mmu/mmu.c         | 70 +++++++++++++++++++++-------------
 arch/x86/kvm/mmu/mmutrace.h    | 13 +++----
 arch/x86/kvm/mmu/paging_tmpl.h |  3 ++
 3 files changed, 52 insertions(+), 34 deletions(-)

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2.28.0