linux-kernel - [PATCH v2 0/2] KVM: SVM: Fix an STI shadow on VMRUN bug

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Message-ID: <20250224165442.2338294-1-seanjc@google.com>
Date: Mon, 24 Feb 2025 08:54:40 -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 v2 0/2] KVM: SVM: Fix an STI shadow on VMRUN bug

Fix a 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.

v2: Use "raw" variants to avoid tracing in noinstr code. [kernel test robot]

v1: https://lore.kernel.org/all/20250215010946.1201353-1-seanjc@google.com

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: fed48e2967f402f561d80075a20c5c9e16866e53
-- 
2.48.1.601.g30ceb7b040-goog