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Re: [PATCH] x86/svm: Adjust vNMI handling to update the cleanbit
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 4 Nov 2026 16:31:16 +0000
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger@xxxxxxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, Jason Andryuk <jason.andryuk@xxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 04 Nov 2026 16:31:30 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 02/11/2026 1:51 pm, Jan Beulich wrote:
> On 02.11.2026 14:46, Andrew Cooper wrote:
>> Despite prior information to the contrary, APM Vol2 revision 3.46 October
>> 2026
>> has been adjusted to state that the vNMI fields in vINTR are covered by the
>> TPR cleanbit.
>>
>> Adjust svm_inject_nmi() and svm_set_interrupt_shadow() to use
>> vmcb_set_vintr()
>> rather than writing into the VMCB directly.
>>
>> In svm_inject_nmi(), fix an inefficiency from the introduction of vNMI. Move
>> the reading of vmcb_get_general1_intercepts() to the point at which it is
>> used; tt does not need reading on the case that vNMIs are enabled.
> Nit: s/tt/it/ ?
Fixed.
>> Fixes: 86a203ab8d38 ("x86/svm: Support vNMI on capable hardware")
>> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> Assuming the first sentence of the description kind of implies trust into this
> being the final word on the matter:
It is formally written statement on the matter, where previously there
was none.
> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
Thanks.
~Andrew
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