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Re: [PATCH] x86/ucode: Fix stability of the Raw CPU Policy rescan
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 24 Jan 2024 16:37:19 +0100
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 24 Jan 2024 15:37:27 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 23.01.2024 21:59, Andrew Cooper wrote:
> Always run microcode_update_helper() on the BSP, so the the updated Raw CPU
> policy doesn't get non-BSP topology details included.
Wouldn't it be better (and consistent with ...
> Have calculate_raw_cpu_policy() clear the instantanious XSTATE sizes. The
> value XCR0 | MSR_XSS had when we scanned the policy isn't terribly interesting
> to report.
... this) to purge these details from the raw policy as well then?
> When CPUID Masking is active, it affects CPUID instructions issued by Xen
> too. Transiently disable masking to get a clean scan.
>
> Fixes: 694d79ed5aac ("x86/ucode: Refresh raw CPU policy after microcode load")
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Irrespective of the question above, I'm also okay with the change as is:
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
Jan
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