linux-kernel - Re: [PATCH RFC 3/5] x86: KVM: svm: clear interrupt shadow on all paths in skip_emulated

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Message-ID: <CALMp9eQ85h58NMDh-yOYvHN6_2f2T-wu63f+yLnNbwuG+p3Uvw@mail.gmail.com>
Date:   Thu, 20 Jun 2019 11:44:55 -0700
From:   Jim Mattson <jmattson@...gle.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     kvm list <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Joerg Roedel <joro@...tes.org>
Subject: Re: [PATCH RFC 3/5] x86: KVM: svm: clear interrupt shadow on all
 paths in skip_emulated_instruction()

On Thu, Jun 20, 2019 at 4:02 AM Vitaly Kuznetsov <vkuznets@...hat.com> wrote:
>
> Regardless of the way how we skip instruction, interrupt shadow needs to be
> cleared.

This change is definitely an improvement, but the existing code seems
to assume that we never call skip_emulated_instruction on a
POP-SS/MOV-to-SS/STI. Is that enforced anywhere?

Reviewed-by: Jim Mattson <jmattson@...gle.com>