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Re: [PATCH 2/6] x86/boot: Adjust MSR_ARCH_CAPS handling for the Host policy
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 16 May 2023 13:47:19 +0200
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 16 May 2023 11:47:32 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 15.05.2023 16:42, Andrew Cooper wrote:
> We are about to move MSR_ARCH_CAPS into featureset, but the order of
> operations (copy raw policy, then copy x86_capabilitiles[] in) will end up
> clobbering the ARCH_CAPS value currently visible in the Host policy.
>
> To avoid this transient breakage, read from raw_cpu_policy rather than
> modifying it in place. This logic will be removed entirely in due course.
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
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