linux-kernel - Re: [PATCH 2/5] KVM: x86/xen: Add an #ifdef'd helper to detect writes to Xen MSR

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Message-ID: <86c5647c-dbbe-4224-91d2-df2a7193d620@xen.org>
Date: Mon, 3 Feb 2025 09:09:56 +0000
From: Paul Durrant <xadimgnik@...il.com>
To: Sean Christopherson <seanjc@...gle.com>,
 Paolo Bonzini <pbonzini@...hat.com>, David Woodhouse <dwmw2@...radead.org>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
 syzbot+cdeaeec70992eca2d920@...kaller.appspotmail.com,
 Joao Martins <joao.m.martins@...cle.com>, David Woodhouse <dwmw@...zon.co.uk>
Subject: Re: [PATCH 2/5] KVM: x86/xen: Add an #ifdef'd helper to detect writes
 to Xen MSR

On 01/02/2025 01:13, Sean Christopherson wrote:
> Add a helper to detect writes to the Xen hypercall page MSR, and provide a
> stub for CONFIG_KVM_XEN=n to optimize out the check for kernels built
> without Xen support.
> 
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> ---
>   arch/x86/kvm/x86.c |  2 +-
>   arch/x86/kvm/xen.h | 10 ++++++++++
>   2 files changed, 11 insertions(+), 1 deletion(-)
> 

Reviewed-by: Paul Durrant <paul@....org>