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([2404:f801:9000:18:efec::75b]) by smtp.gmail.com with ESMTPSA id v18-20020a62a512000000b006089fb79f1esm5690205pfm.96.2023.04.16.00.21.25 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 16 Apr 2023 00:21:35 -0700 (PDT) Message-ID: Date: Sun, 16 Apr 2023 15:21:23 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.10.0 Subject: Re: [RFC PATCH V4 08/17] x86/hyperv: Initialize cpu and memory for sev-snp enlightened guest To: "Michael Kelley (LINUX)" , "luto@kernel.org" , "tglx@linutronix.de" , "mingo@redhat.com" , "bp@alien8.de" , "dave.hansen@linux.intel.com" , "x86@kernel.org" , "hpa@zytor.com" , "seanjc@google.com" , "pbonzini@redhat.com" , "jgross@suse.com" , Tianyu Lan , "kirill@shutemov.name" , "jiangshan.ljs@antgroup.com" , "peterz@infradead.org" , "ashish.kalra@amd.com" , "srutherford@google.com" , "akpm@linux-foundation.org" , "anshuman.khandual@arm.com" , "pawan.kumar.gupta@linux.intel.com" , "adrian.hunter@intel.com" , "daniel.sneddon@linux.intel.com" , "alexander.shishkin@linux.intel.com" , "sandipan.das@amd.com" , "ray.huang@amd.com" , "brijesh.singh@amd.com" , "michael.roth@amd.com" , "thomas.lendacky@amd.com" , "venu.busireddy@oracle.com" , "sterritt@google.com" , "tony.luck@intel.com" , "samitolvanen@google.com" , "fenghua.yu@intel.com" Cc: "pangupta@amd.com" , "linux-kernel@vger.kernel.org" , "kvm@vger.kernel.org" , "linux-hyperv@vger.kernel.org" , "linux-arch@vger.kernel.org" References: <20230403174406.4180472-1-ltykernel@gmail.com> <20230403174406.4180472-9-ltykernel@gmail.com> From: Tianyu Lan In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-3.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM,NICE_REPLY_A, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 4/12/2023 10:39 PM, Michael Kelley (LINUX) wrote: >> + /* Read processor number and memory layout. */ >> + processor_count = *(u32 *)__va(EN_SEV_SNP_PROCESSOR_INFO_ADDR); >> + entry = (struct memory_map_entry *)(__va(EN_SEV_SNP_PROCESSOR_INFO_ADDR) >> + + sizeof(struct memory_map_entry)); > Why is the first map entry being skipped? The first entry is populated with processor count by Hyper-V.