linux-kernel - Re: [sos-linux-ext-patches] [RFC 05/14] x86/apic: Initialize APIC ID for Secure AVIC

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Message-ID: <20241110121221.GAZzCjJU1AUfV8vR3Q@fat_crate.local>
Date: Sun, 10 Nov 2024 13:12:21 +0100
From: Borislav Petkov <bp@...en8.de>
To: Neeraj Upadhyay <Neeraj.Upadhyay@....com>
Cc: "Melody (Huibo) Wang" <huibo.wang@....com>,
	linux-kernel@...r.kernel.org, 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
Subject: Re: [sos-linux-ext-patches] [RFC 05/14] x86/apic: Initialize APIC ID
 for Secure AVIC

On Sun, Nov 10, 2024 at 09:25:34AM +0530, Neeraj Upadhyay wrote:
> Given that in step 3, hv uses "apic_id" (provided by guest) to find the
> corresponding vCPU information, "apic_id" and "hv_apic_id" need to match.
> Mismatch is not considered as a fatal event for guest (snp_abort() is not
> triggered) and a warning is raise,

What is it considered then and why does the warning even exist?

What can anyone do about it?

If you don't kill the guest, what should the guest owner do if she sees that
warning?

-- 
Regards/Gruss,
    Boris.

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