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Re: [PATCH] x86/cpuid: do not expand max leaves on restore
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Fri, 23 Apr 2021 14:47:53 +0200
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- Cc: Ian Jackson <iwj@xxxxxxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Fri, 23 Apr 2021 12:48:06 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Fri, Apr 23, 2021 at 02:41:32PM +0200, Jan Beulich wrote:
> On 23.04.2021 12:54, Roger Pau Monne wrote:
> > When restoring limit the maximum leaves to the ones supported by Xen
> > 4.13 in order to not expand the maximum leaf a guests sees. Note this
> > is unlikely to cause real issues.
>
> Why 4.13 (and not 4.12) here when ...
>
> > Guests restored from Xen versions 4.13 or greater will contain CPUID
> > data on the stream that will override the values set by
> > xc_cpuid_apply_policy.
>
> ... 4.13 already communicates the values?
Urg, yes, my bad. This should have been limited to the max leaves
supported by 4.12, not 4.13.
Let me send a new version also incorporating the feedback from below.
Thanks, Roger.
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