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[83.57.175.68]) by smtp.gmail.com with ESMTPSA id kd13sm6734645ejc.106.2021.02.22.05.19.13 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 22 Feb 2021 05:19:15 -0800 (PST) Subject: Re: [RFC PATCH v2 06/11] hw/ppc: Restrict KVM to various PPC machines To: David Gibson References: <20210219173847.2054123-1-philmd@redhat.com> <20210219173847.2054123-7-philmd@redhat.com> From: =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= Message-ID: Date: Mon, 22 Feb 2021 14:19:13 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.0 MIME-Version: 1.0 In-Reply-To: Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=philmd@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=WINDOWS-1252 Content-Language: en-US Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=216.205.24.124; envelope-from=philmd@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no 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 , Huacai Chen , kvm@vger.kernel.org, Paul Durrant , David Hildenbrand , qemu-devel@nongnu.org, "Edgar E. Iglesias" , Stefano Stabellini , "Michael S. Tsirkin" , Halil Pasic , Christian Borntraeger , =?UTF-8?Q?Herv=c3=a9_Poussineau?= , Anthony Perard , xen-devel@lists.xenproject.org, Leif Lindholm , Thomas Huth , Eduardo Habkost , Mark Cave-Ayland , Alistair Francis , Richard Henderson , Greg Kurz , qemu-s390x@nongnu.org, qemu-arm@nongnu.org, Radoslaw Biernacki , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= , qemu-ppc@nongnu.org, Cornelia Huck , Paolo Bonzini , Aleksandar Rikalo , Aurelien Jarno Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 2/22/21 6:59 AM, David Gibson wrote: > On Fri, Feb 19, 2021 at 06:38:42PM +0100, Philippe Mathieu-Daudé wrote: >> Restrit KVM to the following PPC machines: >> - 40p >> - bamboo >> - g3beige >> - mac99 >> - mpc8544ds >> - ppce500 >> - pseries >> - sam460ex >> - virtex-ml507 > > Hrm. > > The reason this list is kind of surprising is because there are 3 > different "flavours" of KVM on ppc: KVM HV ("pseries" only), KVM PR > (almost any combination, theoretically, but kind of buggy in > practice), and the Book E specific KVM (Book-E systems with HV > extensions only). > > But basically, qemu explicitly managing what accelerators are > available for each machine seems the wrong way around to me. The > approach we've generally taken is that qemu requests the specific > features it needs of KVM, and KVM tells us whether it can supply those > or not (which may involve selecting between one of the several > flavours). > > That way we can extend KVM to cover more situations without needing > corresponding changes in qemu every time. OK thanks for the information. I'll wait the other patches get reviewed (in particular the most important ones, 2 and 10) before respining including this information. Regards, Phil.