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Subject: Re: [PATCH Part2 RFC v4 00/40] Add AMD Secure Nested Paging (SEV-SNP)
 Hypervisor Support
To:     Brijesh Singh <brijesh.singh@amd.com>, x86@kernel.org,
        linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
        linux-efi@vger.kernel.org, platform-driver-x86@vger.kernel.org,
        linux-coco@lists.linux.dev, linux-mm@kvack.org,
        linux-crypto@vger.kernel.org
Cc:     Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Joerg Roedel <jroedel@suse.de>,
        Tom Lendacky <thomas.lendacky@amd.com>,
        "H. Peter Anvin" <hpa@zytor.com>, Ard Biesheuvel <ardb@kernel.org>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Sean Christopherson <seanjc@google.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        Wanpeng Li <wanpengli@tencent.com>,
        Jim Mattson <jmattson@google.com>,
        Andy Lutomirski <luto@kernel.org>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Sergio Lopez <slp@redhat.com>, Peter Gonda <pgonda@google.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
        David Rientjes <rientjes@google.com>,
        Dov Murik <dovmurik@linux.ibm.com>,
        Tobin Feldman-Fitzthum <tobin@ibm.com>,
        Borislav Petkov <bp@alien8.de>,
        Michael Roth <michael.roth@amd.com>,
        Vlastimil Babka <vbabka@suse.cz>, tony.luck@intel.com,
        npmccallum@redhat.com, brijesh.ksingh@gmail.com
References: <20210707183616.5620-1-brijesh.singh@amd.com>
From:   Dave Hansen <dave.hansen@intel.com>
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Message-ID: <aba678aa-ecd7-1a36-6096-10b2e015b25d@intel.com>
Date:   Thu, 8 Jul 2021 08:40:53 -0700
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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?