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a="68392820" X-IronPort-AV: E=Sophos;i="6.21,177,1763452800"; d="scan'208";a="68392820" X-CSE-ConnectionGUID: fRpLWoF6QsKQCagBokJwDQ== X-CSE-MsgGUID: 8A2x8xOmSqaLOHhIabNN8w== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,177,1763452800"; d="scan'208";a="204846803" From: Zhenzhong Duan To: qemu-devel@nongnu.org Cc: alex@shazbot.org, clg@redhat.com, eric.auger@redhat.com, mst@redhat.com, jasowang@redhat.com, peterx@redhat.com, ddutile@redhat.com, jgg@nvidia.com, nicolinc@nvidia.com, skolothumtho@nvidia.com, joao.m.martins@oracle.com, clement.mathieu--drif@eviden.com, kevin.tian@intel.com, yi.l.liu@intel.com, chao.p.peng@intel.com, Zhenzhong Duan Subject: [PATCH v9 1/4] hw/pci: Introduce pci_device_get_host_iommu_quirks() Date: Fri, 26 Dec 2025 03:02:23 -0500 Message-ID: <20251226080227.1167993-2-zhenzhong.duan@intel.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20251226080227.1167993-1-zhenzhong.duan@intel.com> References: <20251226080227.1167993-1-zhenzhong.duan@intel.com> MIME-Version: 1.0 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; 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charset="utf-8" In VFIO core, we call iommufd_backend_get_device_info() to return vendor specific hardware information data, but it's not good to retrieve this raw data in VFIO core. Introduce a new PCIIOMMUOps optional callback, get_host_iommu_quirk() which allows to retrieve the vendor specific hardware information data and convert it into bitmaps defined with enum host_iommu_quirks. pci_device_get_host_iommu_quirks() is a wrapper that can be called on a PCI device potentially protected by a vIOMMU. Suggested-by: Eric Auger Suggested-by: Nicolin Chen Signed-off-by: Zhenzhong Duan --- include/hw/iommu.h | 5 +++++ include/hw/pci/pci.h | 31 +++++++++++++++++++++++++++++++ hw/pci/pci.c | 12 ++++++++++++ 3 files changed, 48 insertions(+) diff --git a/include/hw/iommu.h b/include/hw/iommu.h index 9b8bb94fc2..6d61410703 100644 --- a/include/hw/iommu.h +++ b/include/hw/iommu.h @@ -22,4 +22,9 @@ enum viommu_flags { VIOMMU_FLAG_WANT_NESTING_PARENT =3D BIT_ULL(0), }; =20 +/* Host IOMMU quirks. Extracted from host IOMMU capabilities */ +enum host_iommu_quirks { + HOST_IOMMU_QUIRK_NESTING_PARENT_BYPASS_RO =3D BIT_ULL(0), +}; + #endif /* HW_IOMMU_H */ diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h index a3ca54859c..83dc995cf3 100644 --- a/include/hw/pci/pci.h +++ b/include/hw/pci/pci.h @@ -474,6 +474,23 @@ typedef struct PCIIOMMUOps { * enum viommu_flags. */ uint64_t (*get_viommu_flags)(void *opaque); + /** + * @get_host_iommu_quirks: get host IOMMU quirks + * + * Optional callback, if not implemented, then vIOMMU doesn't support + * converting @type specific hardware information data into a standard + * bitmap format. + * + * @type: IOMMU hardware info type + * + * @caps: IOMMU @type specific hardware information data + * + * @size: size of @caps + * + * Returns: bitmap with each bit representing a host IOMMU quirk defin= ed in + * enum host_iommu_quirks + */ + uint64_t (*get_host_iommu_quirks)(uint32_t type, void *caps, uint32_t = size); /** * @get_iotlb_info: get properties required to initialize a device IOT= LB. * @@ -666,6 +683,20 @@ void pci_device_unset_iommu_device(PCIDevice *dev); */ uint64_t pci_device_get_viommu_flags(PCIDevice *dev); =20 +/** + * pci_device_get_host_iommu_quirks: get host IOMMU quirks. + * + * Returns: bitmap with each bit representing a host IOMMU quirk defined in + * enum host_iommu_quirks. Or 0 if vIOMMU doesn't convert any. + * + * @dev: PCI device pointer. + * @type: IOMMU hardware info type + * @caps: IOMMU @type specific hardware information data + * @size: size of @caps + */ +uint64_t pci_device_get_host_iommu_quirks(PCIDevice *dev, uint32_t type, + void *caps, uint32_t size); + /** * pci_iommu_get_iotlb_info: get properties required to initialize a * device IOTLB. diff --git a/hw/pci/pci.c b/hw/pci/pci.c index 8b62044a8e..520ec19982 100644 --- a/hw/pci/pci.c +++ b/hw/pci/pci.c @@ -3032,6 +3032,18 @@ uint64_t pci_device_get_viommu_flags(PCIDevice *dev) return 0; } =20 +uint64_t pci_device_get_host_iommu_quirks(PCIDevice *dev, uint32_t type, + void *caps, uint32_t size) +{ + PCIBus *iommu_bus; + + pci_device_get_iommu_bus_devfn(dev, &iommu_bus, NULL, NULL); + if (iommu_bus && iommu_bus->iommu_ops->get_host_iommu_quirks) { + return iommu_bus->iommu_ops->get_host_iommu_quirks(type, caps, siz= e); + } + return 0; +} + int pci_pri_request_page(PCIDevice *dev, uint32_t pasid, bool priv_req, bool exec_req, hwaddr addr, bool lpig, uint16_t prgi, bool is_read, bool is_write) --=20 2.47.1