[{"id":3673044,"web_url":"http://patchwork.ozlabs.org/comment/3673044/","msgid":"","list_archive_url":null,"date":"2026-04-03T09:34:13","subject":"Re: [PATCH v3 01/14] vfio/iommufd: Extend attach/detach_hwpt callback\n implementations with pasid","submitter":{"id":85406,"url":"http://patchwork.ozlabs.org/api/people/85406/","name":"Cédric Le Goater","email":"clg@redhat.com"},"content":"On 4/3/26 05:55, Zhenzhong Duan wrote:\n> For attachment with pasid, pasid together with flag VFIO_DEVICE_ATTACH_PASID\n> should be passed in.\n> \n> Define IOMMU_NO_PASID to represent device attachment without pasid same as\n> in kernel.\n> \n> The implementation is similar for detachment.\n> \n> Suggested-by: Shameer Kolothum Thodi \n> Suggested-by: Nicolin Chen \n> Signed-off-by: Zhenzhong Duan \n> Reviewed-by: Yi Liu \n> Reviewed-by: Nicolin Chen \n> Tested-by: Xudong Hao \n\n\nReviewed-by: Cédric Le Goater \n\nThanks,\n\nC.\n\n\n> ---\n> include/hw/core/iommu.h | 2 ++\n> hw/vfio/iommufd.c | 44 +++++++++++++++++++++++++----------------\n> hw/vfio/trace-events | 4 ++--\n> 3 files changed, 31 insertions(+), 19 deletions(-)\n> \n> diff --git a/include/hw/core/iommu.h b/include/hw/core/iommu.h\n> index 86af315c15..bfcd511013 100644\n> --- a/include/hw/core/iommu.h\n> +++ b/include/hw/core/iommu.h\n> @@ -28,4 +28,6 @@ enum host_iommu_quirks {\n> HOST_IOMMU_QUIRK_NESTING_PARENT_BYPASS_RO = BIT_ULL(0),\n> };\n> \n> +#define IOMMU_NO_PASID 0\n> +\n> #endif /* HW_IOMMU_H */\n> diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c\n> index 399b36aa75..f020b56208 100644\n> --- a/hw/vfio/iommufd.c\n> +++ b/hw/vfio/iommufd.c\n> @@ -20,6 +20,7 @@\n> #include \"trace.h\"\n> #include \"qapi/error.h\"\n> #include \"system/iommufd.h\"\n> +#include \"hw/core/iommu.h\"\n> #include \"hw/core/qdev.h\"\n> #include \"hw/vfio/vfio-cpr.h\"\n> #include \"system/reset.h\"\n> @@ -305,43 +306,48 @@ out:\n> return ret;\n> }\n> \n> -static int iommufd_cdev_attach_ioas_hwpt(VFIODevice *vbasedev, uint32_t id,\n> - Error **errp)\n> +static int iommufd_cdev_pasid_attach_ioas_hwpt(VFIODevice *vbasedev,\n> + uint32_t pasid, uint32_t id,\n> + Error **errp)\n> {\n> int iommufd = vbasedev->iommufd->fd;\n> struct vfio_device_attach_iommufd_pt attach_data = {\n> .argsz = sizeof(attach_data),\n> - .flags = 0,\n> + .flags = pasid == IOMMU_NO_PASID ? 0 : VFIO_DEVICE_ATTACH_PASID,\n> + .pasid = pasid,\n> .pt_id = id,\n> };\n> \n> /* Attach device to an IOAS or hwpt within iommufd */\n> if (ioctl(vbasedev->fd, VFIO_DEVICE_ATTACH_IOMMUFD_PT, &attach_data)) {\n> error_setg_errno(errp, errno,\n> - \"[iommufd=%d] error attach %s (%d) to id=%d\",\n> - iommufd, vbasedev->name, vbasedev->fd, id);\n> + \"[iommufd=%d] error attach %s (%d) pasid %d to id=%d\",\n> + iommufd, vbasedev->name, vbasedev->fd, pasid, id);\n> return -errno;\n> }\n> \n> - trace_iommufd_cdev_attach_ioas_hwpt(iommufd, vbasedev->name,\n> - vbasedev->fd, id);\n> + trace_iommufd_cdev_pasid_attach_ioas_hwpt(iommufd, vbasedev->name,\n> + vbasedev->fd, pasid, id);\n> return 0;\n> }\n> \n> -static bool iommufd_cdev_detach_ioas_hwpt(VFIODevice *vbasedev, Error **errp)\n> +static bool iommufd_cdev_pasid_detach_ioas_hwpt(VFIODevice *vbasedev,\n> + uint32_t pasid, Error **errp)\n> {\n> int iommufd = vbasedev->iommufd->fd;\n> struct vfio_device_detach_iommufd_pt detach_data = {\n> .argsz = sizeof(detach_data),\n> - .flags = 0,\n> + .flags = pasid == IOMMU_NO_PASID ? 0 : VFIO_DEVICE_DETACH_PASID,\n> + .pasid = pasid,\n> };\n> \n> if (ioctl(vbasedev->fd, VFIO_DEVICE_DETACH_IOMMUFD_PT, &detach_data)) {\n> - error_setg_errno(errp, errno, \"detach %s failed\", vbasedev->name);\n> + error_setg_errno(errp, errno, \"detach %s pasid %d failed\",\n> + vbasedev->name, pasid);\n> return false;\n> }\n> \n> - trace_iommufd_cdev_detach_ioas_hwpt(iommufd, vbasedev->name);\n> + trace_iommufd_cdev_pasid_detach_ioas_hwpt(iommufd, vbasedev->name, pasid);\n> return true;\n> }\n> \n> @@ -362,7 +368,8 @@ static bool iommufd_cdev_autodomains_get(VFIODevice *vbasedev,\n> /* Try to find a domain */\n> QLIST_FOREACH(hwpt, &container->hwpt_list, next) {\n> if (!cpr_is_incoming()) {\n> - ret = iommufd_cdev_attach_ioas_hwpt(vbasedev, hwpt->hwpt_id, errp);\n> + ret = iommufd_cdev_pasid_attach_ioas_hwpt(vbasedev, IOMMU_NO_PASID,\n> + hwpt->hwpt_id, errp);\n> } else if (vbasedev->cpr.hwpt_id == hwpt->hwpt_id) {\n> ret = 0;\n> } else {\n> @@ -435,7 +442,8 @@ static bool iommufd_cdev_autodomains_get(VFIODevice *vbasedev,\n> return false;\n> }\n> \n> - ret = iommufd_cdev_attach_ioas_hwpt(vbasedev, hwpt_id, errp);\n> + ret = iommufd_cdev_pasid_attach_ioas_hwpt(vbasedev, IOMMU_NO_PASID, hwpt_id,\n> + errp);\n> if (ret) {\n> iommufd_backend_free_id(container->be, hwpt_id);\n> return false;\n> @@ -488,7 +496,8 @@ static bool iommufd_cdev_attach_container(VFIODevice *vbasedev,\n> \n> /* If CPR, we are already attached to ioas_id. */\n> return cpr_is_incoming() ||\n> - !iommufd_cdev_attach_ioas_hwpt(vbasedev, container->ioas_id, errp);\n> + !iommufd_cdev_pasid_attach_ioas_hwpt(vbasedev, IOMMU_NO_PASID,\n> + container->ioas_id, errp);\n> }\n> \n> static void iommufd_cdev_detach_container(VFIODevice *vbasedev,\n> @@ -496,7 +505,7 @@ static void iommufd_cdev_detach_container(VFIODevice *vbasedev,\n> {\n> Error *err = NULL;\n> \n> - if (!iommufd_cdev_detach_ioas_hwpt(vbasedev, &err)) {\n> + if (!iommufd_cdev_pasid_detach_ioas_hwpt(vbasedev, IOMMU_NO_PASID, &err)) {\n> error_report_err(err);\n> }\n> \n> @@ -922,7 +931,8 @@ host_iommu_device_iommufd_vfio_attach_hwpt(HostIOMMUDeviceIOMMUFD *hiodi,\n> {\n> VFIODevice *vbasedev = HOST_IOMMU_DEVICE(hiodi)->agent;\n> \n> - return !iommufd_cdev_attach_ioas_hwpt(vbasedev, hwpt_id, errp);\n> + return !iommufd_cdev_pasid_attach_ioas_hwpt(vbasedev, IOMMU_NO_PASID,\n> + hwpt_id, errp);\n> }\n> \n> static bool\n> @@ -931,7 +941,7 @@ host_iommu_device_iommufd_vfio_detach_hwpt(HostIOMMUDeviceIOMMUFD *hiodi,\n> {\n> VFIODevice *vbasedev = HOST_IOMMU_DEVICE(hiodi)->agent;\n> \n> - return iommufd_cdev_detach_ioas_hwpt(vbasedev, errp);\n> + return iommufd_cdev_pasid_detach_ioas_hwpt(vbasedev, IOMMU_NO_PASID, errp);\n> }\n> \n> static bool hiod_iommufd_vfio_realize(HostIOMMUDevice *hiod, void *opaque,\n> diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events\n> index 846e3625c5..764a3e4855 100644\n> --- a/hw/vfio/trace-events\n> +++ b/hw/vfio/trace-events\n> @@ -182,8 +182,8 @@ vfio_vmstate_change_prepare(const char *name, int running, const char *reason, c\n> \n> iommufd_cdev_connect_and_bind(int iommufd, const char *name, int devfd, int devid) \" [iommufd=%d] Successfully bound device %s (fd=%d): output devid=%d\"\n> iommufd_cdev_getfd(const char *dev, int devfd) \" %s (fd=%d)\"\n> -iommufd_cdev_attach_ioas_hwpt(int iommufd, const char *name, int devfd, int id) \" [iommufd=%d] Successfully attached device %s (%d) to id=%d\"\n> -iommufd_cdev_detach_ioas_hwpt(int iommufd, const char *name) \" [iommufd=%d] Successfully detached %s\"\n> +iommufd_cdev_pasid_attach_ioas_hwpt(int iommufd, const char *name, int devfd, uint32_t pasid, int id) \" [iommufd=%d] Successfully attached device %s (%d) pasid %d to id=%d\"\n> +iommufd_cdev_pasid_detach_ioas_hwpt(int iommufd, const char *name, uint32_t pasid) \" [iommufd=%d] Successfully detached %s pasid %d\"\n> iommufd_cdev_fail_attach_existing_container(const char *msg) \" %s\"\n> iommufd_cdev_alloc_ioas(int iommufd, int ioas_id) \" [iommufd=%d] new IOMMUFD container with ioasid=%d\"\n> iommufd_cdev_device_info(char *name, int devfd, int num_irqs, int num_regions, int flags) \" %s (%d) num_irqs=%d num_regions=%d flags=%d\"","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=D1CIiydB;\n\tdkim=pass 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