linux-kernel - Re: [PATCH 06/11] x86/sev: Replace occurrences of sev_es_active() with prot_guest

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Message-ID: <e63c166f-fd56-4aba-3d4f-b2d10051769a@linux.intel.com>
Date:   Mon, 9 Aug 2021 15:08:53 -0700
From:   "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Tom Lendacky <thomas.lendacky@....com>,
        Joerg Roedel <joro@...tes.org>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        iommu@...ts.linux-foundation.org, kvm@...r.kernel.org,
        linux-efi@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-graphics-maintainer@...are.com,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        kexec@...ts.infradead.org, linux-fsdevel@...r.kernel.org,
        Borislav Petkov <bp@...en8.de>,
        Brijesh Singh <brijesh.singh@....com>,
        Andi Kleen <ak@...ux.intel.com>,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH 06/11] x86/sev: Replace occurrences of sev_es_active()
 with prot_guest_has()



On 8/9/21 2:59 PM, Tom Lendacky wrote:
>> Not sure how TDX will handle AP booting, are you sure it needs this
>> special setup as well? Otherwise a check for SEV-ES would be better
>> instead of the generic PATTR_GUEST_PROT_STATE.
> Yes, I'm not sure either. I figure that change can be made, if needed, as
> part of the TDX support.

We don't plan to set PROT_STATE. So it does not affect TDX.
For SMP, we use MADT ACPI table for AP booting.

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer