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Re: [PATCH] x86/svm: Adjust vNMI handling to update the cleanbit
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 2 Nov 2026 14:51:20 +0100
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- Cc: Roger Pau Monné <roger@xxxxxxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, Jason Andryuk <jason.andryuk@xxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Mon, 02 Nov 2026 13:51:29 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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/ ?
> 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:
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
Jan
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