linux-kernel - Re: [PATCH] arch/x86: Set XSS while handling #VC intercept for CPUID

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Message-ID: <ZRvhjd48oHq2gXB2@gmail.com>
Date:   Tue, 3 Oct 2023 11:40:29 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Jinank Jain <jinankjain@...ux.microsoft.com>
Cc:     seanjc@...gle.com, pbonzini@...hat.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        x86@...nel.org, hpa@...or.com, jinankjain@...rosoft.com,
        thomas.lendacky@....com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, wei.liu@...nel.org,
        tiala@...rosoft.com
Subject: Re: [PATCH] arch/x86: Set XSS while handling #VC intercept for CPUID


* Jinank Jain <jinankjain@...ux.microsoft.com> wrote:

> According to [1], while handling the #VC intercept for CPUID leaf
> 0x0000_000D, we need to supply the value of XSS in the GHCB page. If
> this value is not provided then a spec compliant hypervisor can fail the
> GHCB request and kill the guest.
> 
> [1] https://www.amd.com/system/files/TechDocs/56421-guest-hypervisor-communication-block-standardization.pdf

URL doesn't seem to exist, I get redirected to AMD's 404 page.

Thanks,

	Ingo