[{"id":3673047,"web_url":"http://patchwork.ozlabs.org/comment/3673047/","msgid":"<6e7013da-fae9-48a3-bdd0-9e19711cedaf@redhat.com>","list_archive_url":null,"date":"2026-04-03T09:38:33","subject":"Re: [PATCH v3 03/14] vfio/iommufd: Create nesting parent hwpt with\n IOMMU_HWPT_ALLOC_PASID flag","submitter":{"id":85406,"url":"http://patchwork.ozlabs.org/api/people/85406/","name":"Cédric Le Goater","email":"clg@redhat.com"},"content":"Hello Zhenzhong\n\nOn 4/3/26 05:55, Zhenzhong Duan wrote:\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. So\n> we can't check the existing vIOMMU flag VIOMMU_FLAG_PASID_SUPPORTED 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 VTD.\n> \n> Signed-off-by: Zhenzhong Duan \n> Reviewed-by: Yi Liu \n> Tested-by: Xudong Hao \n> ---\n> include/hw/core/iommu.h | 1 +\n> include/hw/vfio/vfio-device.h | 1 +\n> hw/vfio/device.c | 11 +++++++++++\n> hw/vfio/iommufd.c | 8 +++++++-\n> 4 files changed, 20 insertions(+), 1 deletion(-)\n> \n> diff --git a/include/hw/core/iommu.h b/include/hw/core/iommu.h\n> index bfcd511013..67c575b08c 100644\n> --- a/include/hw/core/iommu.h\n> +++ b/include/hw/core/iommu.h\n> @@ -21,6 +21,7 @@ enum viommu_flags {\n> /* vIOMMU needs nesting parent HWPT to create nested HWPT */\n> VIOMMU_FLAG_WANT_NESTING_PARENT = BIT_ULL(0),\n> VIOMMU_FLAG_PASID_SUPPORTED = BIT_ULL(1),\n> + VIOMMU_FLAG_WANT_PASID_ATTACH = BIT_ULL(2),\n\nVIOMMU_FLAG_WANT_NESTING_DIRTY_TRACKING was introduced since. The change\nis on vfio-next.\n\nYou will need to rebase. While at it, I think the documentation of each\nof these VIOMMU_FLAGs can be improved.\n\nThanks,\n\nC.\n\n\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 828a31c006..d6e522f8b8 100644\n> --- a/include/hw/vfio/vfio-device.h\n> +++ b/include/hw/vfio/vfio-device.h\n> @@ -268,6 +268,7 @@ void vfio_device_prepare(VFIODevice *vbasedev, VFIOContainer *bcontainer,\n> 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_pasid_attach(VFIODevice *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 973fc35b59..bc1d37e776 100644\n> --- a/hw/vfio/device.c\n> +++ b/hw/vfio/device.c\n> @@ -533,6 +533,17 @@ bool 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 *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 ecabc33064..ead40b6617 100644\n> --- a/hw/vfio/iommufd.c\n> +++ b/hw/vfio/iommufd.c\n> @@ -363,6 +363,7 @@ static bool 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> @@ -408,7 +409,7 @@ static bool iommufd_cdev_autodomains_get(VFIODevice *vbasedev,\n> */\n> if (!iommufd_backend_get_device_info(vbasedev->iommufd, vbasedev->devid,\n> &type, &caps, sizeof(caps), &hw_caps,\n> - NULL, errp)) {\n> + &max_pasid_log2, errp)) {\n> return false;\n> }\n> \n> @@ -430,6 +431,11 @@ static bool 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> +\n> if (cpr_is_incoming()) {\n> hwpt_id = vbasedev->cpr.hwpt_id;\n> goto skip_alloc;","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=Gby0qUma;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=google header.b=knR1gD7z;\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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