linux-kernel - [PATCH 0/2] KVM: SVM: Fix unexpected #UD on INT3 in SEV guests

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Message-ID: <20230810234919.145474-1-seanjc@google.com>
Date:   Thu, 10 Aug 2023 16:49:16 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Wu Zongyo <wuzongyo@...l.ustc.edu.cn>,
        Tom Lendacky <thomas.lendacky@....com>
Subject: [PATCH 0/2] KVM: SVM: Fix unexpected #UD on INT3 in SEV guests

Fix a bug where KVM injects a bogus #UD for SEV guests when trying to skip
an INT3 as part of re-injecting the associated #BP that got kinda sorta
intercepted due to a #NPF occuring while vectoring/delivering the #BP.

I haven't actually confirmed that patch 1 fixes the bug, as it's a
different change than what I originally proposed.  I'm 99% certain it will
work, but I definitely need verification that it fixes the problem

Patch 2 is a tangentially related cleanup to make NRIPS a requirement for
enabling SEV, e.g. so that we don't ever get "bug" reports of SEV guests
not working when NRIPS is disabled.

Sean Christopherson (2):
  KVM: SVM: Don't inject #UD if KVM attempts emulation of SEV guest w/o
    insn
  KVM: SVM: Require nrips support for SEV guests (and beyond)

 arch/x86/kvm/svm/sev.c |  2 +-
 arch/x86/kvm/svm/svm.c | 37 ++++++++++++++++++++-----------------
 arch/x86/kvm/svm/svm.h |  1 +
 3 files changed, 22 insertions(+), 18 deletions(-)

base-commit: 240f736891887939571854bd6d734b6c9291f22e
-- 
2.41.0.694.ge786442a9b-goog