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Tsirkin" To: Jason Gunthorpe Subject: Re: [PATCH vfio 10/11] vfio/virtio: Expose admin commands over virtio device Message-ID: <20231010120158-mutt-send-email-mst@kernel.org> References: <20231005111004.GK682044@nvidia.com> <20231010131031.GJ3952@nvidia.com> <20231010094756-mutt-send-email-mst@kernel.org> <20231010140849.GL3952@nvidia.com> <20231010105339-mutt-send-email-mst@kernel.org> <20231010111339-mutt-send-email-mst@kernel.org> <20231010155937.GN3952@nvidia.com> MIME-Version: 1.0 In-Reply-To: <20231010155937.GN3952@nvidia.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Disposition: inline Cc: kvm@vger.kernel.org, maorg@nvidia.com, virtualization@lists.linux-foundation.org, Christoph Hellwig , jiri@nvidia.com, leonro@nvidia.com X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" On Tue, Oct 10, 2023 at 12:59:37PM -0300, Jason Gunthorpe wrote: > On Tue, Oct 10, 2023 at 11:14:56AM -0400, Michael S. Tsirkin wrote: > > > I suggest 3 but call it on the VF. commands will switch to PF > > internally as needed. For example, intel might be interested in exposing > > admin commands through a memory BAR of VF itself. > > FWIW, we have been pushing back on such things in VFIO, so it will > have to be very carefully security justified. > > Probably since that is not standard it should just live in under some > intel-only vfio driver behavior, not in virtio land. > > It is also costly to switch between pf/vf, it should not be done > pointlessly on the fast path. > > Jason Currently, the switch seems to be just a cast of private data. I am suggesting keeping that cast inside virtio. Why is that expensive? _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization