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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=170.10.133.124; envelope-from=clg@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.484, 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_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 4/25/25 15:01, John Levon wrote: > On Fri, Apr 25, 2025 at 02:46:48PM +0200, Cédric Le Goater wrote: > >> After this patch, here is what we have for the base class : >> static const Property vfio_pci_base_dev_properties[] = { >> DEFINE_PROP_ON_OFF_AUTO("x-pre-copy-dirty-page-tracking", VFIOPCIDevice, >> vbasedev.pre_copy_dirty_page_tracking, >> ON_OFF_AUTO_ON), >> DEFINE_PROP_ON_OFF_AUTO("x-device-dirty-page-tracking", VFIOPCIDevice, >> vbasedev.device_dirty_page_tracking, >> ON_OFF_AUTO_ON), >> DEFINE_PROP_UINT32("x-intx-mmap-timeout-ms", VFIOPCIDevice, >> intx.mmap_timeout, 1100), >> DEFINE_PROP_ON_OFF_AUTO("enable-migration", VFIOPCIDevice, >> vbasedev.enable_migration, ON_OFF_AUTO_AUTO), >> DEFINE_PROP("x-migration-multifd-transfer", VFIOPCIDevice, >> vbasedev.migration_multifd_transfer, >> vfio_pci_migration_multifd_transfer_prop, OnOffAuto, >> .set_default = true, .defval.i = ON_OFF_AUTO_AUTO), >> DEFINE_PROP_BOOL("migration-events", VFIOPCIDevice, >> vbasedev.migration_events, false), >> DEFINE_PROP_BOOL("x-no-mmap", VFIOPCIDevice, vbasedev.no_mmap, false), >> DEFINE_PROP_BOOL("x-balloon-allowed", VFIOPCIDevice, >> vbasedev.ram_block_discard_allowed, false), >> DEFINE_PROP_BOOL("x-no-kvm-intx", VFIOPCIDevice, no_kvm_intx, false), >> DEFINE_PROP_BOOL("x-no-kvm-msi", VFIOPCIDevice, no_kvm_msi, false), >> DEFINE_PROP_BOOL("x-no-kvm-msix", VFIOPCIDevice, no_kvm_msix, false), >> DEFINE_PROP_BOOL("x-no-kvm-ioeventfd", VFIOPCIDevice, no_kvm_ioeventfd, >> false), >> DEFINE_PROP_BOOL("x-no-vfio-ioeventfd", VFIOPCIDevice, no_vfio_ioeventfd, >> false), >> DEFINE_PROP_UINT32("x-pci-vendor-id", VFIOPCIDevice, vendor_id, PCI_ANY_ID), >> DEFINE_PROP_UINT32("x-pci-device-id", VFIOPCIDevice, device_id, PCI_ANY_ID), >> DEFINE_PROP_UINT32("x-pci-sub-vendor-id", VFIOPCIDevice, >> sub_vendor_id, PCI_ANY_ID), >> DEFINE_PROP_UINT32("x-pci-sub-device-id", VFIOPCIDevice, >> sub_device_id, PCI_ANY_ID), >> DEFINE_PROP_OFF_AUTO_PCIBAR("x-msix-relocation", VFIOPCIDevice, msix_relo, >> OFF_AUTO_PCIBAR_OFF), >> }; >> and for vfio-pci : >> static const Property vfio_pci_dev_properties[] = { >> DEFINE_PROP_PCI_HOST_DEVADDR("host", VFIOPCIDevice, host), >> DEFINE_PROP_UUID_NODEFAULT("vf-token", VFIOPCIDevice, vf_token), >> DEFINE_PROP_STRING("sysfsdev", VFIOPCIDevice, vbasedev.sysfsdev), >> DEFINE_PROP_ON_OFF_AUTO("display", VFIOPCIDevice, >> display, ON_OFF_AUTO_OFF), >> DEFINE_PROP_UINT32("xres", VFIOPCIDevice, display_xres, 0), >> DEFINE_PROP_UINT32("yres", VFIOPCIDevice, display_yres, 0), >> DEFINE_PROP_BIT("x-vga", VFIOPCIDevice, features, >> VFIO_FEATURE_ENABLE_VGA_BIT, false), >> DEFINE_PROP_BIT("x-req", VFIOPCIDevice, features, >> VFIO_FEATURE_ENABLE_REQ_BIT, true), >> DEFINE_PROP_BIT("x-igd-opregion", VFIOPCIDevice, features, >> VFIO_FEATURE_ENABLE_IGD_OPREGION_BIT, false), >> DEFINE_PROP_UINT32("x-igd-gms", VFIOPCIDevice, igd_gms, 0), >> DEFINE_PROP_BIT("x-igd-lpc", VFIOPCIDevice, features, >> VFIO_FEATURE_ENABLE_IGD_LPC_BIT, false), >> DEFINE_PROP_ON_OFF_AUTO("x-igd-legacy-mode", VFIOPCIDevice, >> igd_legacy_mode, ON_OFF_AUTO_AUTO), >> DEFINE_PROP_BOOL("x-no-geforce-quirks", VFIOPCIDevice, >> no_geforce_quirks, false), >> DEFINE_PROP_UNSIGNED_NODEFAULT("x-nv-gpudirect-clique", VFIOPCIDevice, >> nv_gpudirect_clique, >> qdev_prop_nv_gpudirect_clique, uint8_t), >> #ifdef CONFIG_IOMMUFD >> DEFINE_PROP_LINK("iommufd", VFIOPCIDevice, vbasedev.iommufd, >> TYPE_IOMMUFD_BACKEND, IOMMUFDBackend *), >> #endif >> DEFINE_PROP_BOOL("skip-vsc-check", VFIOPCIDevice, skip_vsc_check, true), >> }; >> Graphic property and host device definitions are excluded from the >> base class it seems. This might fit vfio-user needs but it looks >> like a quick hack from the vfio-pci side. It needs more work. > > Can you suggest a preferred approach? I'm definitely not wedded to the current > way (after all, I didn't write it !), but I'm not sure how else we could do it. > > Perhaps if there's some way to deregister properties when vfio-user > instantiates? > >>>> Can you remind me why the vfio-pci class for vfio-user can not >>>> inherit directly from vfio-pci ? >>> >>> For the above reason: we'd inherit many properties that don't work for >>> vfio-user. >> >> What do you mean by "don't work" ? functionally irrelevant ? > > I don't know the answer to that in general. Certainly some are just irrelevant > (like sysfsdev), but it's entirely possible the other stuff actively breaks. > Presumably you agree it's not good to introduce potential footguns for users > here? Do we know which properties are required for the vfio-user variant of the vfio-pci device ? I'd be tempted to start with an empty abstract vfio-pci-base device class. This wouldn't change the current vfio-pci device much, and the vfio-user variant would duplicate the necessary properties. Thanks, C.