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a="372563829" X-IronPort-AV: E=Sophos;i="6.03,253,1694761200"; d="scan'208";a="372563829" X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.03,253,1694761200"; d="scan'208";a="463854" From: Zhenzhong Duan To: qemu-devel@nongnu.org Cc: alex.williamson@redhat.com, clg@redhat.com, jgg@nvidia.com, nicolinc@nvidia.com, joao.m.martins@oracle.com, eric.auger@redhat.com, peterx@redhat.com, jasowang@redhat.com, kevin.tian@intel.com, yi.l.liu@intel.com, yi.y.sun@intel.com, chao.p.peng@intel.com, Zhenzhong Duan Subject: [PATCH v3 33/37] vfio/pci: Make vfio cdev pre-openable by passing a file handle Date: Thu, 26 Oct 2023 18:31:00 +0800 Message-Id: <20231026103104.1686921-34-zhenzhong.duan@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231026103104.1686921-1-zhenzhong.duan@intel.com> References: <20231026103104.1686921-1-zhenzhong.duan@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=134.134.136.126; envelope-from=zhenzhong.duan@intel.com; helo=mgamail.intel.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @intel.com) X-ZM-MESSAGEID: 1698317494206100004 This gives management tools like libvirt a chance to open the vfio cdev with privilege and pass FD to qemu. This way qemu never needs to have privilege to open a VFIO or iommu cdev node. Together with the earlier support of pre-opening /dev/iommu device, now we have full support of passing a vfio device to unprivileged qemu by management tool. This mode is no more considered for the legacy backend. So let's remove the "TODO" comment. Add a helper function vfio_device_get_name() to check fd and get device name, it will also be used by other vfio devices. There is no easy way to check if a device is mdev with FD passing, so fail the x-balloon-allowed check unconditionally in this case. There is also no easy way to get BDF as name with FD passing, so we fake a name by VFIO_FD[fd]. Signed-off-by: Zhenzhong Duan Signed-off-by: C=C3=A9dric Le Goater --- include/hw/vfio/vfio-common.h | 1 + hw/vfio/helpers.c | 33 +++++++++++++++++++++++++++++ hw/vfio/iommufd.c | 12 +++++++---- hw/vfio/pci.c | 40 ++++++++++++++++++++++++----------- 4 files changed, 70 insertions(+), 16 deletions(-) diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h index 95afee7243..5c00699290 100644 --- a/include/hw/vfio/vfio-common.h +++ b/include/hw/vfio/vfio-common.h @@ -258,6 +258,7 @@ struct vfio_info_cap_header * vfio_get_device_info_cap(struct vfio_device_info *info, uint16_t id); struct vfio_info_cap_header * vfio_get_cap(void *ptr, uint32_t cap_offset, uint16_t id); +int vfio_device_get_name(VFIODevice *vbasedev, Error **errp); #endif =20 bool vfio_migration_realize(VFIODevice *vbasedev, Error **errp); diff --git a/hw/vfio/helpers.c b/hw/vfio/helpers.c index 168847e7c5..044dbbc501 100644 --- a/hw/vfio/helpers.c +++ b/hw/vfio/helpers.c @@ -609,3 +609,36 @@ bool vfio_has_region_cap(VFIODevice *vbasedev, int reg= ion, uint16_t cap_type) =20 return ret; } + +int vfio_device_get_name(VFIODevice *vbasedev, Error **errp) +{ + struct stat st; + + if (vbasedev->fd < 0) { + if (stat(vbasedev->sysfsdev, &st) < 0) { + error_setg_errno(errp, errno, "no such host device"); + error_prepend(errp, VFIO_MSG_PREFIX, vbasedev->sysfsdev); + return -errno; + } + /* User may specify a name, e.g: VFIO platform device */ + if (!vbasedev->name) { + vbasedev->name =3D g_path_get_basename(vbasedev->sysfsdev); + } + } +#ifdef CONFIG_IOMMUFD + else { + if (!vbasedev->iommufd) { + error_setg(errp, "Use FD passing only with iommufd backend"); + return -EINVAL; + } + /* + * Give a name with fd so any function printing out vbasedev->name + * will not break. + */ + if (!vbasedev->name) { + vbasedev->name =3D g_strdup_printf("VFIO_FD%d", vbasedev->fd); + } + } +#endif + return 0; +} diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c index 18a09d7f5a..20df807d7c 100644 --- a/hw/vfio/iommufd.c +++ b/hw/vfio/iommufd.c @@ -405,11 +405,15 @@ static int iommufd_attach_device(char *name, VFIODevi= ce *vbasedev, uint32_t ioas_id; Error *err =3D NULL; =20 - devfd =3D vfio_get_devicefd(vbasedev->sysfsdev, errp); - if (devfd < 0) { - return devfd; + if (vbasedev->fd < 0) { + devfd =3D vfio_get_devicefd(vbasedev->sysfsdev, errp); + if (devfd < 0) { + return devfd; + } + vbasedev->fd =3D devfd; + } else { + devfd =3D vbasedev->fd; } - vbasedev->fd =3D devfd; =20 ret =3D iommufd_connect_and_bind(vbasedev, errp); if (ret) { diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index 386c08576a..32a4e8beb0 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -44,6 +44,7 @@ #include "migration/qemu-file.h" #include "linux/iommufd.h" #include "sysemu/iommufd.h" +#include "monitor/monitor.h" =20 #define TYPE_VFIO_PCI_NOHOTPLUG "vfio-pci-nohotplug" =20 @@ -3267,18 +3268,23 @@ static void vfio_realize(PCIDevice *pdev, Error **e= rrp) VFIODevice *vbasedev =3D &vdev->vbasedev; char *tmp, *subsys; Error *err =3D NULL; - struct stat st; int i, ret; bool is_mdev; char uuid[UUID_FMT_LEN]; char *name; =20 - if (!vbasedev->sysfsdev) { + if (vbasedev->fd < 0 && !vbasedev->sysfsdev) { if (!(~vdev->host.domain || ~vdev->host.bus || ~vdev->host.slot || ~vdev->host.function)) { error_setg(errp, "No provided host device"); +#ifdef CONFIG_IOMMUFD + error_append_hint(errp, "Use -device vfio-pci,host=3DDDDD:BB:D= D.F, " + "-device vfio-pci,sysfsdev=3DPATH_TO_DEVICE " + "or -device vfio-pci,fd=3DDEVICE_FD\n"); +#else error_append_hint(errp, "Use -device vfio-pci,host=3DDDDD:BB:D= D.F " "or -device vfio-pci,sysfsdev=3DPATH_TO_DEVI= CE\n"); +#endif return; } vbasedev->sysfsdev =3D @@ -3287,13 +3293,9 @@ static void vfio_realize(PCIDevice *pdev, Error **er= rp) vdev->host.slot, vdev->host.function); } =20 - if (stat(vbasedev->sysfsdev, &st) < 0) { - error_setg_errno(errp, errno, "no such host device"); - error_prepend(errp, VFIO_MSG_PREFIX, vbasedev->sysfsdev); + if (vfio_device_get_name(vbasedev, errp)) { return; } - - vbasedev->name =3D g_path_get_basename(vbasedev->sysfsdev); vbasedev->ops =3D &vfio_pci_ops; vbasedev->type =3D VFIO_DEVICE_TYPE_PCI; vbasedev->dev =3D DEVICE(vdev); @@ -3653,6 +3655,7 @@ static void vfio_instance_init(Object *obj) vdev->host.bus =3D ~0U; vdev->host.slot =3D ~0U; vdev->host.function =3D ~0U; + vdev->vbasedev.fd =3D -1; =20 vdev->nv_gpudirect_clique =3D 0xFF; =20 @@ -3706,11 +3709,6 @@ static Property vfio_pci_dev_properties[] =3D { qdev_prop_nv_gpudirect_clique, uint8_t), DEFINE_PROP_OFF_AUTO_PCIBAR("x-msix-relocation", VFIOPCIDevice, msix_r= elo, OFF_AUTOPCIBAR_OFF), - /* - * TODO - support passed fds... is this necessary? - * DEFINE_PROP_STRING("vfiofd", VFIOPCIDevice, vfiofd_name), - * DEFINE_PROP_STRING("vfiogroupfd, VFIOPCIDevice, vfiogroupfd_name), - */ #ifdef CONFIG_IOMMUFD DEFINE_PROP_LINK("iommufd", VFIOPCIDevice, vbasedev.iommufd, TYPE_IOMMUFD_BACKEND, IOMMUFDBackend *), @@ -3718,6 +3716,21 @@ static Property vfio_pci_dev_properties[] =3D { DEFINE_PROP_END_OF_LIST(), }; =20 +#ifdef CONFIG_IOMMUFD +static void vfio_pci_set_fd(Object *obj, const char *str, Error **errp) +{ + VFIOPCIDevice *vdev =3D VFIO_PCI(obj); + int fd =3D -1; + + fd =3D monitor_fd_param(monitor_cur(), str, errp); + if (fd =3D=3D -1) { + error_prepend(errp, "Could not parse remote object fd %s:", str); + return; + } + vdev->vbasedev.fd =3D fd; +} +#endif + static void vfio_pci_dev_class_init(ObjectClass *klass, void *data) { DeviceClass *dc =3D DEVICE_CLASS(klass); @@ -3725,6 +3738,9 @@ static void vfio_pci_dev_class_init(ObjectClass *klas= s, void *data) =20 dc->reset =3D vfio_pci_reset; device_class_set_props(dc, vfio_pci_dev_properties); +#ifdef CONFIG_IOMMUFD + object_class_property_add_str(klass, "fd", NULL, vfio_pci_set_fd); +#endif dc->desc =3D "VFIO-based PCI device assignment"; set_bit(DEVICE_CATEGORY_MISC, dc->categories); pdc->realize =3D vfio_realize; --=20 2.34.1