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Re: [PATCH for-4.22] x86/fred: Send an EVENT_CHECK IPI on exit from NMI
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 25 Jun 2026 10:29:34 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 25 Jun 2026 09:30:01 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 24/06/2026 3:43 pm, Jan Beulich wrote:
> On 24.06.2026 16:23, Andrew Cooper wrote:
>> Returning from an NMI which hits guest context needs special casing in FRED
>> mode just like it does in IDT mode.
>>
>> Break nmi_exit_to_guest() out of handle_ist_exception(), and use it in
>> entry_FRED_R3() also.
>>
>> Expand the comment a little, and invert the conditional jump to
>> compat_restore_all_guest() to avoid needing an #else clause for CONFIG_PV32.
>>
>> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
> provided of course ...
>
>> Slightly RFC, not tested yet. (My AMD system takes an eternity to reboot)
> ... the results of this won't prove it wrong.
Testing is good. We now get core register state on all CPUs, rather
than missing the ones which were in guest context.
~Andrew
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