[{"id":3684738,"web_url":"http://patchwork.ozlabs.org/comment/3684738/","msgid":"","list_archive_url":null,"date":"2026-04-30T13:39:29","subject":"RE: [PATCH v4 03/15] vfio/iommufd: Create nesting parent hwpt with\n IOMMU_HWPT_ALLOC_PASID flag","submitter":{"id":91580,"url":"http://patchwork.ozlabs.org/api/people/91580/","name":"Shameer Kolothum Thodi","email":"skolothumtho@nvidia.com"},"content":"> -----Original Message-----\n> From: Zhenzhong Duan \n> Sent: 30 April 2026 08:13\n> To: qemu-devel@nongnu.org\n> Cc: alex@shazbot.org; clg@redhat.com; eric.auger@redhat.com;\n> mst@redhat.com; jasowang@redhat.com; Jason Gunthorpe\n> ; Nicolin Chen ; Shameer Kolothum\n> Thodi ; joao.m.martins@oracle.com;\n> clement.mathieu--drif@bull.com; kevin.tian@intel.com; yi.l.liu@intel.com;\n> xudong.hao@intel.com; Zhenzhong Duan \n> Subject: [PATCH v4 03/15] vfio/iommufd: Create nesting parent hwpt with\n> IOMMU_HWPT_ALLOC_PASID flag\n> \n> External email: Use caution opening links or attachments\n> \n> \n> When both device and vIOMMU have PASID enabled, then guest may setup\n> pasid attached translation.\n> \n> VFIO needs to be aware of potential pasid usage and should attach the\n> non-pasid part of pasid-capable device to hwpt flagged with\n> IOMMU_HWPT_ALLOC_PASID.\n> \n> ARM SMMU doesn't support IOMMU_HWPT_ALLOC_PASID, only VTD need it.\n> So\n> we can't check the existing vIOMMU flag VIOMMU_FLAG_PASID_SUPPORTED\n> to\n> determine if set flag IOMMU_HWPT_ALLOC_PASID. Instead, introduce a new\n> flag VIOMMU_FLAG_WANT_PASID_ATTACH which will only be exposed by\n> VTD.\n> \n> Opportunistically add documentation for VIOMMU_FLAG_PASID_SUPPORTED\n> and explain the difference with VIOMMU_FLAG_WANT_PASID_ATTACH.\n> \n> Signed-off-by: Zhenzhong Duan \n> Reviewed-by: Yi Liu \n> Tested-by: Xudong Hao \n> ---\n> include/hw/core/iommu.h | 11 +++++++++++\n> include/hw/vfio/vfio-device.h | 1 +\n> hw/vfio/device.c | 11 +++++++++++\n> hw/vfio/iommufd.c | 8 +++++++-\n> 4 files changed, 30 insertions(+), 1 deletion(-)\n> \n> diff --git a/include/hw/core/iommu.h b/include/hw/core/iommu.h\n> index 77739d4214..20d6d79062 100644\n> --- a/include/hw/core/iommu.h\n> +++ b/include/hw/core/iommu.h\n> @@ -20,9 +20,20 @@\n> enum viommu_flags {\n> /* vIOMMU needs nesting parent HWPT to create nested HWPT */\n> VIOMMU_FLAG_WANT_NESTING_PARENT = BIT_ULL(0),\n> + /*\n> + * vIOMMU supports PASID capability, VFIO checks this flag and synthesize\n> + * a PASID capability.\n> + */\n> VIOMMU_FLAG_PASID_SUPPORTED = BIT_ULL(1),\n> /* vIOMMU needs dirty tracking on the nesting parent HWPT for nested use\n> */\n> VIOMMU_FLAG_WANT_NESTING_DIRTY_TRACKING = BIT_ULL(2),\n> + /*\n> + * vIOMMU requests other sub-system like VFIO to create a HWPT that can\n> be\n> + * used with PASID attachment. VIOMMU_FLAG_PASID_SUPPORTED can't\n> be used\n> + * for this purpose as PASID attachment is needed by VTD IOMMU but not\n> ARM\n> + * SMMU.\n> + */\n> + VIOMMU_FLAG_WANT_PASID_ATTACH = BIT_ULL(3),\n> };\n> \n> /* Host IOMMU quirks. Extracted from host IOMMU capabilities */\n> diff --git a/include/hw/vfio/vfio-device.h b/include/hw/vfio/vfio-device.h\n> index 380a55d6e5..8472420d3f 100644\n> --- a/include/hw/vfio/vfio-device.h\n> +++ b/include/hw/vfio/vfio-device.h\n> @@ -282,6 +282,7 @@ void vfio_device_unprepare(VFIODevice *vbasedev);\n> \n> bool vfio_device_get_viommu_flags_want_nesting(VFIODevice *vbasedev);\n> bool vfio_device_get_viommu_flags_want_nesting_dirty(VFIODevice\n> *vbasedev);\n> +bool vfio_device_get_viommu_flags_want_pasid_attach(VFIODevice\n> *vbasedev);\n> bool vfio_device_get_host_iommu_quirk_bypass_ro(VFIODevice *vbasedev,\n> uint32_t type, void *caps,\n> uint32_t size);\n> diff --git a/hw/vfio/device.c b/hw/vfio/device.c\n> index 3ffd69a579..b954b44d31 100644\n> --- a/hw/vfio/device.c\n> +++ b/hw/vfio/device.c\n> @@ -544,6 +544,17 @@ bool\n> vfio_device_get_viommu_flags_want_nesting(VFIODevice *vbasedev)\n> return false;\n> }\n> \n> +bool vfio_device_get_viommu_flags_want_pasid_attach(VFIODevice\n> *vbasedev)\n> +{\n> + VFIOPCIDevice *vdev = vfio_pci_from_vfio_device(vbasedev);\n> +\n> + if (vdev) {\n> + return !!(pci_device_get_viommu_flags(PCI_DEVICE(vdev)) &\n> + VIOMMU_FLAG_WANT_PASID_ATTACH);\n> + }\n> + return false;\n> +}\n> +\n> bool vfio_device_get_host_iommu_quirk_bypass_ro(VFIODevice *vbasedev,\n> uint32_t type, void *caps,\n> uint32_t size)\n> diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c\n> index 78e7b6a045..0718f029ca 100644\n> --- a/hw/vfio/iommufd.c\n> +++ b/hw/vfio/iommufd.c\n> @@ -364,6 +364,7 @@ static bool\n> iommufd_cdev_autodomains_get(VFIODevice *vbasedev,\n> VendorCaps caps;\n> VFIOIOASHwpt *hwpt;\n> uint32_t hwpt_id;\n> + uint8_t max_pasid_log2 = 0;\n> int ret;\n> \n> /* Try to find a domain */\n> @@ -409,7 +410,7 @@ static bool\n> iommufd_cdev_autodomains_get(VFIODevice *vbasedev,\n> */\n> if (!iommufd_backend_get_device_info(vbasedev->iommufd, vbasedev-\n> >devid,\n> &type, &caps, sizeof(caps), &hw_caps,\n> - NULL, errp)) {\n> + &max_pasid_log2, errp)) {\n> return false;\n> }\n> \n> @@ -437,6 +438,11 @@ static bool\n> iommufd_cdev_autodomains_get(VFIODevice *vbasedev,\n> }\n> }\n> \n> + if (max_pasid_log2 &&\n> + vfio_device_get_viommu_flags_want_pasid_attach(vbasedev)) {\n> + flags |= IOMMU_HWPT_ALLOC_PASID;\n> + }\n\nHere, suppose a container already has an hwpt without IOMMU_HWPT_ALLOC_PASID\n(from a no PASID device), and a PASID capable device then tries to attach to it\nvia the FOREACH loop above, does the kernel return -EINVAL:\n\nret = iommufd_cdev_pasid_attach_ioas_hwpt(vbasedev, IOMMU_NO_PASID,\n hwpt->hwpt_id, errp);\n\nIf not, it will get attached to NO_PASID HWPT and return there, isn't it?\n\nThanks,\nShameer","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 (2048-bit key;\n unprotected) header.d=Nvidia.com header.i=@Nvidia.com header.a=rsa-sha256\n header.s=selector2 header.b=fW+RicjN;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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