linux-kernel - Re: [PATCH v8 03/15] KVM: xen: mark guest pages dirty with the pfncache lock held

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Date:   Tue, 21 Nov 2023 21:49:52 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Paul Durrant <paul@....org>,
        Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 03/15] KVM: xen: mark guest pages dirty with the
 pfncache lock held

On Tue, 2023-11-21 at 18:02 +0000, Paul Durrant wrote:
> From: Paul Durrant <pdurrant@...zon.com>
> 
> Sampling gpa and memslot from an unlocked pfncache may yield inconsistent
> values so, since there is no problem with calling mark_page_dirty_in_slot()
> with the pfncache lock held, relocate the calls in
> kvm_xen_update_runstate_guest() and kvm_xen_inject_pending_events()
> accordingly.
> 
> Signed-off-by: Paul Durrant <pdurrant@...zon.com>

Reviewed-by: David Woodhouse <dwmw@...zon.co.uk>

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