linux-kernel - Re: [RFC PATCH v8 27/35] x86/apic: Add support to send NMI IPI for Secure AVIC

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Message-ID: <CAMvTesCqqVovTAyRWZNq1Ermbf1UCK29_-wYA0e99RdSOHxS4Q@mail.gmail.com>
Date: Fri, 18 Jul 2025 10:57:30 +0800
From: Tianyu Lan <ltykernel@...il.com>
To: Neeraj Upadhyay <Neeraj.Upadhyay@....com>
Cc: linux-kernel@...r.kernel.org, bp@...en8.de, tglx@...utronix.de, 
	mingo@...hat.com, dave.hansen@...ux.intel.com, Thomas.Lendacky@....com, 
	nikunj@....com, Santosh.Shukla@....com, Vasant.Hegde@....com, 
	Suravee.Suthikulpanit@....com, David.Kaplan@....com, x86@...nel.org, 
	hpa@...or.com, peterz@...radead.org, seanjc@...gle.com, pbonzini@...hat.com, 
	kvm@...r.kernel.org, kirill.shutemov@...ux.intel.com, huibo.wang@....com, 
	naveen.rao@....com, kai.huang@...el.com
Subject: Re: [RFC PATCH v8 27/35] x86/apic: Add support to send NMI IPI for
 Secure AVIC

On Wed, Jul 9, 2025 at 11:45 AM Neeraj Upadhyay <Neeraj.Upadhyay@....com> wrote:
>
> Secure AVIC has introduced a new field in the APIC backing page
> "NmiReq" that has to be set by the guest to request a NMI IPI
> through APIC_ICR write.
>
> Add support to set NmiReq appropriately to send NMI IPI.
>
> Sending NMI IPI also requires Virtual NMI feature to be enabled
> in VINTRL_CTRL field in the VMSA. However, this would be added by
> a later commit after adding support for injecting NMI from the
> hypervisor.
>
> Co-developed-by: Kishon Vijay Abraham I <kvijayab@....com>
> Signed-off-by: Kishon Vijay Abraham I <kvijayab@....com>
> Signed-off-by: Neeraj Upadhyay <Neeraj.Upadhyay@....com>
> ---
> Changes since v7:
>  - No change.
Reviewed-by: Tianyu Lan <tiala@...rosoft.com>
--
Thanks
Tianyu Lan