linux-kernel - [PATCH 0/2] KVM: SVM: Final C-bit fixes?

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Message-Id: <20210625020354.431829-1-seanjc@google.com>
Date:   Thu, 24 Jun 2021 19:03:52 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.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, Peter Gonda <pgonda@...gle.com>,
        Brijesh Singh <brijesh.singh@....com>,
        Tom Lendacky <thomas.lendacky@....com>
Subject: [PATCH 0/2] KVM: SVM: Final C-bit fixes?

Patch 01 reverts the C-bit truncation patch as the reserved #PF was
confirmed to be due to a magic HyperTransport region (how many magic
addresses are there!?!).  Hopefully the original patch simply be dropped,
but just in case...

Patch 02 reverts the C-bit clearing in the #NPF handler.  If that somehow
turns out to be incorrect, i.e. there are flows where the CPU doesn't
mask off the C-bit, then it can be conditional on a SEV guest.

I'll be offline for the next two weeks, fingers crossed I've undone all
the damage.  :-)

Thanks!

Sean Christopherson (2):
  Revert "KVM: x86: Truncate reported guest MAXPHYADDR to C-bit if SEV
    is supported"
  KVM: SVM: Revert clearing of C-bit on GPA in #NPF handler

 arch/x86/kvm/cpuid.c   | 11 -----------
 arch/x86/kvm/svm/svm.c | 39 +++++++++------------------------------
 arch/x86/kvm/x86.c     |  3 ---
 arch/x86/kvm/x86.h     |  1 -
 4 files changed, 9 insertions(+), 45 deletions(-)

-- 
2.32.0.93.g670b81a890-goog