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Thu, 22 Aug 2019 11:43:28 -0700 (PDT) Received: from [192.168.10.150] ([93.56.166.5]) by smtp.gmail.com with ESMTPSA id w13sm974366wre.44.2019.08.22.11.43.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 22 Aug 2019 11:43:28 -0700 (PDT) To: Laszlo Ersek , "Kinney, Michael D" , "rfc@edk2.groups.io" , "Yao, Jiewen" References: <8091f6e8-b1ec-f017-1430-00b0255729f4@redhat.com> <74D8A39837DF1E4DA445A8C0B3885C503F75B680@shsmsx102.ccr.corp.intel.com> <047801f8-624a-2300-3cf7-1daa1395ce59@redhat.com> <99219f81-33a3-f447-95f8-f10341d70084@redhat.com> <6f8b9507-58d0-5fbd-b827-c7194b3b2948@redhat.com> <74D8A39837DF1E4DA445A8C0B3885C503F75FAD3@shsmsx102.ccr.corp.intel.com> <7cb458ea-956e-c1df-33f7-025e4f0f22df@redhat.com> <74D8A39837DF1E4DA445A8C0B3885C503F7600B9@shsmsx102.ccr.corp.intel.com> <20190816161933.7d30a881@x1.home> <74D8A39837DF1E4DA445A8C0B3885C503F761B96@shsmsx102.ccr.corp.intel.com> <35396800-32d2-c25f-b0d0-2d7cd8438687@redhat.com> From: Paolo Bonzini Openpgp: preference=signencrypt Message-ID: <2b4ba607-f0e3-efee-6712-6dcef129b310@redhat.com> Date: Thu, 22 Aug 2019 20:43:25 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=iso-2022-jp Content-Language: en-US Content-Transfer-Encoding: 7bit X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: Re: [Qemu-devel] [edk2-rfc] [edk2-devel] CPU hotplug using SMM with QEMU+OVMF X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Chen, Yingwen" , "devel@edk2.groups.io" , Phillip Goerl , qemu devel list , Alex Williamson , "Nakajima, Jun" , Igor Mammedov , Boris Ostrovsky , Joao Marcal Lemos Martins Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 22/08/19 19:59, Laszlo Ersek wrote: > The firmware and QEMU could agree on a formula, which would compute the > CPU-specific SMBASE from a value pre-programmed by the firmware, and the > initial APIC ID of the hot-added CPU. > > Yes, it would duplicate code -- the calculation -- between QEMU and > edk2. While that's not optimal, it wouldn't be a first. No, that would be unmaintainable. The best solution to me seems to be to make SMBASE programmable from non-SMM code if some special conditions hold. Michael, would it be possible to get in contact with the Intel architects? Paolo