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[35.185.214.157]) by smtp.gmail.com with ESMTPSA id p5sm24369675pfn.46.2021.07.20.15.09.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 Jul 2021 15:09:32 -0700 (PDT) Date: Tue, 20 Jul 2021 22:09:28 +0000 From: Sean Christopherson To: Brijesh Singh Cc: 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, Thomas Gleixner , Ingo Molnar , Joerg Roedel , Tom Lendacky , "H. Peter Anvin" , Ard Biesheuvel , Paolo Bonzini , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Andy Lutomirski , Dave Hansen , Sergio Lopez , Peter Gonda , Peter Zijlstra , Srinivas Pandruvada , David Rientjes , Dov Murik , Tobin Feldman-Fitzthum , Borislav Petkov , Michael Roth , Vlastimil Babka , tony.luck@intel.com, npmccallum@redhat.com, brijesh.ksingh@gmail.com Subject: Re: [PATCH Part2 RFC v4 38/40] KVM: SVM: Provide support for SNP_GUEST_REQUEST NAE event Message-ID: References: <20210707183616.5620-1-brijesh.singh@amd.com> <20210707183616.5620-39-brijesh.singh@amd.com> <68ea014c-51bc-6ed4-a77e-dd7ce1a09aaf@amd.com> <0641fdec-48a0-b3b7-9926-3ce5a6e53eb0@amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <0641fdec-48a0-b3b7-9926-3ce5a6e53eb0@amd.com> X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 480FFE0019BD X-Stat-Signature: h3pxdqzdndyme71wdhwwqcr45pfqx13t Authentication-Results: imf30.hostedemail.com; dkim=pass header.d=google.com header.s=20161025 header.b="iC5/q3Dl"; dmarc=pass (policy=reject) header.from=google.com; spf=pass (imf30.hostedemail.com: domain of seanjc@google.com designates 209.85.210.182 as permitted sender) smtp.mailfrom=seanjc@google.com X-HE-Tag: 1626818974-363040 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, Jul 20, 2021, Brijesh Singh wrote: > > On 7/20/21 11:28 AM, Sean Christopherson wrote: > > Out of curiosity, why 4 VMPCKs? It seems completely arbitrary. > > > > I believe the thought process was by providing 4 keys it can provide > flexibility for each VMPL levels to use a different keys (if they wish). The > firmware does not care about the vmpl level during the guest request > handling, it just want to know which key is used for encrypting the payload > so that he can decrypt and provide the response for it. Ah, I forgot about VMPLs. That makes sense. Thanks!