linux-kernel - [PATCH 0/2] KVM: x86: avoid using stale x86_emulate

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Date:   Tue,  3 Mar 2020 15:33:14 +0100
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org
Cc:     Jim Mattson <jmattson@...gle.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Bandan Das <bsd@...hat.com>, Oliver Upton <oupton@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] KVM: x86: avoid using stale x86_emulate_ctxt->intercept value

After commit 07721feee46b ("KVM: nVMX: Don't emulate instructions in guest
mode") Hyper-V guests on KVM stopped booting and tracing shows that we're
trying to emulate an instruction which shouldn't be intercepted. Turns out,
x86_emulate_ctxt may hold a stale 'intercept' value.

This is a regression in 5.6-rc4 and I'm marking PATCH1 for stable@. The
commit 07721feee46b ("KVM: nVMX: Don't emulate instructions in guest mode")
is, however, correct, it just seems to reveal a pre-existing condition.

Vitaly Kuznetsov (2):
  KVM: x86: clear stale x86_emulate_ctxt->intercept value
  KVM: x86: remove stale comment from struct x86_emulate_ctxt

 arch/x86/include/asm/kvm_emulate.h | 1 -
 arch/x86/kvm/emulate.c             | 1 +
 2 files changed, 1 insertion(+), 1 deletion(-)

-- 
2.24.1