linux-kernel - Re: [PATCHv2 0/7] Implement support for unaccepted memory

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Message-ID: <05067267-494d-beb6-a935-9f39f5c120ae@amd.com>
Date:   Tue, 18 Jan 2022 15:05:34 -0600
From:   Brijesh Singh <brijesh.singh@....com>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        Sean Christopherson <seanjc@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Joerg Roedel <jroedel@...e.de>,
        Ard Biesheuvel <ardb@...nel.org>
Cc:     brijesh.singh@....com, Andi Kleen <ak@...ux.intel.com>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        David Rientjes <rientjes@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Tom Lendacky <thomas.lendacky@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Ingo Molnar <mingo@...hat.com>,
        Varad Gautam <varad.gautam@...e.com>,
        Dario Faggioli <dfaggioli@...e.com>, x86@...nel.org,
        linux-mm@...ck.org, linux-coco@...ts.linux.dev,
        linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2 0/7] Implement support for unaccepted memory

Hi Kirill,

...

> 
> The approach lowers boot time substantially. Boot to shell is ~2.5x
> faster for 4G TDX VM and ~4x faster for 64G.
> 
> Patches 1-6/7 are generic and don't have any dependencies on TDX. They
> should serve AMD SEV needs as well. TDX-specific code isolated in the
> last patch. This patch requires the core TDX patchset which is currently
> under review.
> 

I can confirm that this series works for the SEV-SNP guest. I was able 
to hook the SEV-SNP page validation vmgexit (similar to the TDX patch#7) 
and have verified that the guest kernel successfully accepted all the 
memory regions marked unaccepted by the EFI boot loader.
Not a big deal, but can I ask you to include me in Cc on the future 
series; I should be able to do more testing on SNP hardware and provide 
my Test-by tag.

~ Brijesh