linux-kernel - Re: [PATCH v10 10/19] KVM: xen: (re-)initialize shared

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Message-ID: <78bf00d0a25042bd21d1e3d2916ae007c25e9c10.camel@infradead.org>
Date:   Thu, 14 Dec 2023 13:44:40 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Paul Durrant <paul@....org>, Paolo Bonzini <pbonzini@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Sean Christopherson <seanjc@...gle.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>, Shuah Khan <shuah@...nel.org>,
        kvm@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v10 10/19] KVM: xen: (re-)initialize shared_info if
 guest (32/64-bit) mode is set

On Mon, 2023-12-04 at 14:43 +0000, Paul Durrant wrote:
> From: Paul Durrant <pdurrant@...zon.com>
> 
> If the shared_info PFN cache has already been initialized then the content
> of the shared_info page needs to be (re-)initialized whenever the guest
> mode is (re)set.
> Setting the guest mode is either done explicitly by the VMM via the
> KVM_XEN_ATTR_TYPE_LONG_MODE attribute, or implicitly when the guest writes
> the MSR to set up the hypercall page.
> 
> Signed-off-by: Paul Durrant <pdurrant@...zon.com>


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

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