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Re: [PATCH v3 3/3] x86/hvm: don't let EFLAGS.IF block #MC in hvm_interrupt_blocked
- To: chunjie.zhu@xxxxxxxxxx
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 12 Nov 2026 15:15:51 +0100
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- Cc: andrew.cooper3@xxxxxxxxxx, jason.andryuk@xxxxxxx, roger@xxxxxxxxxxxxxx, teddy.astie@xxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, ross.lagerwall@xxxxxxxxxx
- Delivery-date: Thu, 12 Nov 2026 14:15:59 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 12.11.2026 12:35, chunjie.zhu@xxxxxxxxxx wrote:
> From: Chunjie Zhu <chunjie.zhu@xxxxxxxxxx>
>
> EFLAGS.IF doesn't mask NMI or #MC, but hvm_interrupt_blocked() only
> exempted NMI from the EFLAGS.IF check, so a pending #MC was held off
> while the guest had interrupts disabled.
>
> Exempt hvm_intsrc_mce as well.
>
> Signed-off-by: Chunjie Zhu <chunjie.zhu@xxxxxxxxxx>
> ---
> v3:
> * New patch. hvm_interrupt_blocked() only exempted NMI from the EFLAGS.IF
> check, not #MC, as noted by Ross.
I.e. Reported-by: wants adding? (Happy to do so while committing.)
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
Jan
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