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Mon, 22 Jun 2020 16:04:23 -0700 (PDT) Subject: Re: [PATCH v2] target/arm: Check supported KVM features globally (not per vCPU) To: "Dr. David Alan Gilbert" , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= References: <20200619095542.2095-1-philmd@redhat.com> <20200619120202.GH2690@work-vm> From: Paolo Bonzini Message-ID: Date: Tue, 23 Jun 2020 01:04:22 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 MIME-Version: 1.0 In-Reply-To: <20200619120202.GH2690@work-vm> Content-Language: en-US Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=pbonzini@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=205.139.110.61; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/22 03:17:49 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action 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: Peter Maydell , Andrew Jones , kvm@vger.kernel.org, qemu-devel@nongnu.org, qemu-arm@nongnu.org, Haibo Xu Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 19/06/20 14:02, Dr. David Alan Gilbert wrote: >> Paolo, does this break migration of encrypted memory assumptions? >> >> Cc: Dr. David Alan Gilbert >> Supersedes: <20200617130800.26355-1-philmd@redhat.com> > I'm not seeing the relevance to migration. I told Philippe that there could be a possibility in the future of having more than one KVMState to support SEV live migration, so removing all KVMState* arguments is not a good idea. But for kvm_check_extension calls it should be safe, as those should be the same for all VMs. Paolo