linux-kernel - Re: [PATCH Part2 RFC v4 00/40] Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support

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Date:   Thu, 8 Jul 2021 08:40:53 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Brijesh Singh <brijesh.singh@....com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-efi@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-coco@...ts.linux.dev, linux-mm@...ck.org,
        linux-crypto@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Joerg Roedel <jroedel@...e.de>,
        Tom Lendacky <thomas.lendacky@....com>,
        "H. Peter Anvin" <hpa@...or.com>, Ard Biesheuvel <ardb@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Sergio Lopez <slp@...hat.com>, Peter Gonda <pgonda@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        David Rientjes <rientjes@...gle.com>,
        Dov Murik <dovmurik@...ux.ibm.com>,
        Tobin Feldman-Fitzthum <tobin@....com>,
        Borislav Petkov <bp@...en8.de>,
        Michael Roth <michael.roth@....com>,
        Vlastimil Babka <vbabka@...e.cz>, tony.luck@...el.com,
        npmccallum@...hat.com, brijesh.ksingh@...il.com
Subject: Re: [PATCH Part2 RFC v4 00/40] Add AMD Secure Nested Paging (SEV-SNP)
 Hypervisor Support

On 7/7/21 11:35 AM, Brijesh Singh wrote:
> Changes since v3:
>  * Add support for extended guest message request.
>  * Add ioctl to query the SNP Platform status.
>  * Add ioctl to get and set the SNP config.
>  * Add check to verify that memory reserved for the RMP covers the full system RAM.
>  * Start the SNP specific commands from 256 instead of 255.
>  * Multiple cleanup and fixes based on the review feedback.
> 
> Changes since v2:
>  * Add AP creation support.
>  * Drop the patch to handle the RMP fault for the kernel address.
>  * Add functions to track the write access from the hypervisor.
>  * Do not enable the SNP feature when IOMMU is disabled or is in passthrough mode.
>  * Dump the RMP entry on RMP violation for the debug.
>  * Shorten the GHCB macro names.
>  * Start the SNP_INIT command id from 255 to give some gap for the legacy SEV.
>  * Sync the header with the latest 0.9 SNP spec.

What happened to the THP splitting on RMP violations?