linux-kernel - [PATCH 0/2] KVM: SVM: Fix an STI shadow on VMRUN bug

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Message-ID: <20250215010946.1201353-1-seanjc@google.com>
Date: Fri, 14 Feb 2025 17:09:44 -0800
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, 
	Doug Covelli <doug.covelli@...adcom.com>
Subject: [PATCH 0/2] KVM: SVM: Fix an STI shadow on VMRUN bug

Fix an amusing bug where KVM puts VMRUN in an STI shadow, which AMD CPUs
bleed into guest state if a #VMEXIT occurs before completing the VMRUN,
e.g. if vectoring an injected exception triggers an exit.

Sean Christopherson (2):
  KVM: SVM: Set RFLAGS.IF=1 in C code, to get VMRUN out of the STI
    shadow
  KVM: selftests: Assert that STI blocking isn't set after event
    injection

 arch/x86/kvm/svm/svm.c                             | 14 ++++++++++++++
 arch/x86/kvm/svm/vmenter.S                         | 10 +---------
 .../selftests/kvm/x86/nested_exceptions_test.c     |  2 ++
 3 files changed, 17 insertions(+), 9 deletions(-)


base-commit: f0f0cbf3b767935abcfdb36649ab626fb2ab5ae7
-- 
2.48.1.601.g30ceb7b040-goog