linux-kernel - [PATCH 0/2] KVM: selftests: Fix sync

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Date:   Thu, 17 Aug 2023 16:34:28 -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,
        Michal Luczaj <mhal@...x.co>
Subject: [PATCH 0/2] KVM: selftests: Fix sync_regs race tests on AMD

The recently introduced sync_regs subtests to detect TOCTOU bugs hang on
AMD because KVM synthesizes INIT on triple fault shutdown (because AMD says
the VMCB is undefined after shutdown).  Fix it by loading known good state
if a shutdown occurs.

Patch two explicitly injects #UD as the "good" vector so that the test
doesn't rely on KVM inadvertantly setting the vector to #DE (old, buggy
behavior).

Sean Christopherson (2):
  KVM: selftests: Reload "good" vCPU state if vCPU hits shutdown
  KVM: selftests: Explicit set #UD when *potentially* injecting
    exception

 .../selftests/kvm/x86_64/sync_regs_test.c       | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

base-commit: b6d40d24bb2eae6d4c2d4799ddbffcf7bae663db
-- 
2.42.0.rc1.204.g551eb34607-goog