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([2001:b07:6468:f312:63a7:c72e:ea0e:6045]) by smtp.googlemail.com with ESMTPSA id mm15-20020a1709077a8f00b00a1b6ec7a88asm7794237ejc.113.2023.12.13.05.40.25 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 13 Dec 2023 05:40:31 -0800 (PST) Message-ID: <9ac2311c-9ccc-4468-9b26-6cb0872e207f@redhat.com> Date: Wed, 13 Dec 2023 14:40:24 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v10 04/50] x86/cpufeatures: Add SEV-SNP CPU feature To: Borislav Petkov Cc: Michael Roth , kvm@vger.kernel.org, linux-coco@lists.linux.dev, linux-mm@kvack.org, linux-crypto@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com, jroedel@suse.de, thomas.lendacky@amd.com, hpa@zytor.com, ardb@kernel.org, seanjc@google.com, vkuznets@redhat.com, jmattson@google.com, luto@kernel.org, dave.hansen@linux.intel.com, slp@redhat.com, pgonda@google.com, peterz@infradead.org, srinivas.pandruvada@linux.intel.com, rientjes@google.com, dovmurik@linux.ibm.com, tobin@ibm.com, vbabka@suse.cz, kirill@shutemov.name, ak@linux.intel.com, tony.luck@intel.com, marcorr@google.com, sathyanarayanan.kuppuswamy@linux.intel.com, alpergun@google.com, jarkko@kernel.org, ashish.kalra@amd.com, nikunj.dadhania@amd.com, pankaj.gupta@amd.com, liam.merwick@oracle.com, zhi.a.wang@intel.com, Brijesh Singh , Jarkko Sakkinen References: <20231016132819.1002933-1-michael.roth@amd.com> <20231016132819.1002933-5-michael.roth@amd.com> <0b2eb374-356c-46c6-9c4a-9512fbfece7a@redhat.com> <20231213131324.GDZXmt9LsMmJZyzCJw@fat_crate.local> <40915dc3-4083-4b9f-bc64-7542833566e1@redhat.com> <20231213133628.GEZXmzXFwA1p+crH/5@fat_crate.local> From: Paolo Bonzini Autocrypt: addr=pbonzini@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Stat-Signature: 44a9y9kqcw6xnix636ignrsn1tem1odg X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: B8BEB1C001A X-HE-Tag: 1702474836-249073 X-HE-Meta: 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 ifs4gYQ6 uvB+cGu0Hwkw46NfywZ586BscXt/NXzUz4F3Dfsk6mp+4m0/I43G7aCAmGx7VxFgLqpTlFU459XyHKTCnEvQQgJJocm2c6fjlu2Yk4B80+OFXSWnLkPe+OagARK+tigkKc1TAxmy9z15QtQWwTyYsV5Fz0nHMlZhnwzbPnQuorVIEcy6/47ruU/6w/RBzyP7Uw2yvSodrXqhKcscv8BQ8KiWF2HC1G+3L/rVuA7X0FTOWhLqHmxv9kESbvuHUhkWqoN3qQmrQyx0jXpmSFTOqL7EYv4lw7q7SrfMF44SiHINNTJmj8TItvbstSUeGvIp55qbHAMb000/fSy7EZOMwQu2MewsXhkz4B7+UrXffw2RRD1YrVFDqUezJ3I86q87lBR9X 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: List-Subscribe: List-Unsubscribe: On 12/13/23 14:36, Borislav Petkov wrote: >> Sure, I only queued it because you gave Acked-by for 05/50 and this is an >> obvious dependency. I would like to get things in as they are ready >> (whenever it makes sense), so if you want to include those two in the x86 >> tree for 6.8, that would work for me. > > It doesn't make sense to include them into 6.8 because the two alone are > simply dead code in 6.8. Why are they dead code? X86_FEATURE_SEV_SNP is set automatically based on CPUID, therefore patch 5 is a performance improvement on all processors that support SEV-SNP. This is independent of whether KVM can create SEV-SNP guests or not. If this is wrong, there is a problem in the commit messages. Paolo > The plan is to put the x86 patches first in the next submission, I'll > pick them up for 6.9 and then give you an immutable branch to apply the > KVM bits ontop. This way it all goes together.