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Tsirkin" To: David Woodhouse Cc: Richard Cochran , Peter Hilber , linux-kernel@vger.kernel.org, virtualization@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-rtc@vger.kernel.org, "Ridoux, Julien" , virtio-dev@lists.linux.dev, "Luu, Ryan" , "Chashper, David" , "Mohamed Abuelfotoh, Hazem" , "Christopher S . Hall" , Jason Wang , John Stultz , netdev@vger.kernel.org, Stephen Boyd , Thomas Gleixner , Xuan Zhuo , Marc Zyngier , Mark Rutland , Daniel Lezcano , Alessandro Zummo , Alexandre Belloni , qemu-devel , Simon Horman Subject: Re: [PATCH] ptp: Add vDSO-style vmclock support Message-ID: <20240725083215-mutt-send-email-mst@kernel.org> References: <14d1626bc9ddae9d8ad19d3c508538d10f5a8e44.camel@infradead.org> <20240725012730-mutt-send-email-mst@kernel.org> <7de7da1122e61f8c64bbaab04a35af93fafac454.camel@infradead.org> <20240725081502-mutt-send-email-mst@kernel.org> <20240725082828-mutt-send-email-mst@kernel.org> MIME-Version: 1.0 In-Reply-To: X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240725_053323_175746_67245492 X-CRM114-Status: GOOD ( 23.67 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Jul 25, 2024 at 01:31:19PM +0100, David Woodhouse wrote: > On Thu, 2024-07-25 at 08:29 -0400, Michael S. Tsirkin wrote: > > On Thu, Jul 25, 2024 at 01:27:49PM +0100, David Woodhouse wrote: > > > On Thu, 2024-07-25 at 08:17 -0400, Michael S. Tsirkin wrote: > > > > On Thu, Jul 25, 2024 at 10:56:05AM +0100, David Woodhouse wrote: > > > > > > Do you want to just help complete virtio-rtc then? Would be easier than > > > > > > trying to keep two specs in sync. > > > > > > > > > > The ACPI version is much more lightweight and doesn't take up a > > > > > valuable PCI slot#. (I know, you can do virtio without PCI but that's > > > > > complex in other ways). > > > > > > > > > > > > > Hmm, should we support virtio over ACPI? Just asking. > > > > > > Given that we support virtio DT bindings, and the ACPI "PRP0001" device > > > exists with a DSM method which literally returns DT properties, > > > including such properties as "compatible=virtio,mmio" ... do we > > > already? > > > > > > > > > > In a sense, but you are saying that is too complex? > > Can you elaborate? > > No, I think it's fine. I encourage the use of the PRP0001 device to > expose DT devices through ACPI. I was just reminding you of its > existence. > > Confused. You said "I know, you can do virtio without PCI but that's complex in other ways" as the explanation why you are doing a custom protocol. -- MST