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Re: [PATCH v2 06/10] x86/boot: Expose MSR_ARCH_CAPS data in guest max policies
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 24 May 2023 17:02:31 +0200
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 24 May 2023 15:02:52 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 24.05.2023 13:25, Andrew Cooper wrote:
> We already have common and default feature adjustment helpers. Introduce one
> for max featuresets too.
>
> Offer MSR_ARCH_CAPS unconditionally in the max policy, and stop clobbering the
> data inherited from the Host policy. This will be necessary to level a VM
> safely for migration. Annotate the ARCH_CAPS CPUID bit as special. Note:
> ARCH_CAPS is still max-only for now, so will not be inhereted by the default
> policies.
>
> With this done, the special case for dom0 can be shrunk to just resampling the
> Host policy (as ARCH_CAPS isn't visible by default yet).
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
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