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Re: [PATCH v2 06/23] x86/traps: Set MSR_PL0_SSP in load_system_tables()
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 1 Sep 2025 11:23:07 +0200
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Mon, 01 Sep 2025 09:23:12 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 28.08.2025 17:03, Andrew Cooper wrote:
> FRED and IDT differ by a Supervisor Token on the base of the shstk. This
> means that the value they load into MSR_PL0_SSP differs by 8.
>
> s3_resume() in particular has logic which is otherwise invariant of FRED mode,
> and must not clobber a FRED MSR_PL0_SSP with an IDT one.
>
> This also simplifies the AP path too. Updating reinit_bsp_stack() is deferred
> until later.
This last sentence looks to be ...
> No functional change.
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> ---
> CC: Jan Beulich <JBeulich@xxxxxxxx>
> CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
>
> v2:
> * Extend comment about clearing the busy bit.
> * Move reinit_bsp_stack() hunk into this patch.
... stale, according to this. Other than that:
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
Jan
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