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a="55981927" X-IronPort-AV: E=Sophos;i="6.16,348,1744095600"; d="scan'208";a="55981927" X-CSE-ConnectionGUID: IBAv/ouMQtuOz3ZZGKBKfQ== X-CSE-MsgGUID: DkbTSSJKRGqv1LiyHYSYFg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.16,348,1744095600"; d="scan'208";a="162691278" From: Zhenzhong Duan To: qemu-devel@nongnu.org Cc: alex.williamson@redhat.com, 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, shameerali.kolothum.thodi@huawei.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 v4 09/20] intel_iommu: Introduce two helpers vtd_as_from/to_iommu_pasid_locked Date: Tue, 29 Jul 2025 05:20:31 -0400 Message-ID: <20250729092043.785836-10-zhenzhong.duan@intel.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20250729092043.785836-1-zhenzhong.duan@intel.com> References: <20250729092043.785836-1-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; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=192.198.163.17; envelope-from=zhenzhong.duan@intel.com; helo=mgamail.intel.com X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 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, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, 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: 1753780993711116600 Content-Type: text/plain; charset="utf-8" PCI device supports two request types, Requests-without-PASID and Requests-with-PASID. Requests-without-PASID doesn't include a PASID TLP prefix, IOMMU fetches rid_pasid from context entry and use it as IOMMU's pasid to index pasid table. So we need to translate between PCI's pasid and IOMMU's pasid specially for Requests-without-PASID, e.g., PCI_NO_PASID(-1) <-> rid_pasid. For Requests-with-PASID, PCI's pasid and IOMMU's pasid are same value. vtd_as_from_iommu_pasid_locked() translates from BDF+iommu_pasid to vtd_as which contains PCI's pasid vtd_as->pasid. vtd_as_to_iommu_pasid_locked() translates from BDF+vtd_as->pasid to iommu_p= asid. Signed-off-by: Zhenzhong Duan Reviewed-by: Eric Auger --- hw/i386/intel_iommu.c | 58 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c index 1410ddd65e..eb0e799e4a 100644 --- a/hw/i386/intel_iommu.c +++ b/hw/i386/intel_iommu.c @@ -1602,6 +1602,64 @@ static int vtd_dev_to_context_entry(IntelIOMMUState = *s, uint8_t bus_num, return 0; } =20 +static int vtd_as_to_iommu_pasid_locked(VTDAddressSpace *vtd_as, + uint32_t *pasid) +{ + VTDContextCacheEntry *cc_entry =3D &vtd_as->context_cache_entry; + IntelIOMMUState *s =3D vtd_as->iommu_state; + uint8_t bus_num =3D pci_bus_num(vtd_as->bus); + uint8_t devfn =3D vtd_as->devfn; + VTDContextEntry ce; + int ret; + + /* For Requests-with-PASID, its pasid value is used by vIOMMU directly= */ + if (vtd_as->pasid !=3D PCI_NO_PASID) { + *pasid =3D vtd_as->pasid; + return 0; + } + + if (cc_entry->context_cache_gen =3D=3D s->context_cache_gen) { + ce =3D cc_entry->context_entry; + } else { + ret =3D vtd_dev_to_context_entry(s, bus_num, devfn, &ce); + if (ret) { + return ret; + } + } + + *pasid =3D VTD_CE_GET_RID2PASID(&ce); + return 0; +} + +static gboolean vtd_find_as_by_sid_and_iommu_pasid(gpointer key, gpointer = value, + gpointer user_data) +{ + VTDAddressSpace *vtd_as =3D (VTDAddressSpace *)value; + struct vtd_as_raw_key *target =3D (struct vtd_as_raw_key *)user_data; + uint16_t sid =3D PCI_BUILD_BDF(pci_bus_num(vtd_as->bus), vtd_as->devfn= ); + uint32_t pasid; + + if (vtd_as_to_iommu_pasid_locked(vtd_as, &pasid)) { + return false; + } + + return (pasid =3D=3D target->pasid) && (sid =3D=3D target->sid); +} + +/* Translate iommu pasid to vtd_as */ +static inline +VTDAddressSpace *vtd_as_from_iommu_pasid_locked(IntelIOMMUState *s, + uint16_t sid, uint32_t pas= id) +{ + struct vtd_as_raw_key key =3D { + .sid =3D sid, + .pasid =3D pasid + }; + + return g_hash_table_find(s->vtd_address_spaces, + vtd_find_as_by_sid_and_iommu_pasid, &key); +} + static int vtd_sync_shadow_page_hook(const IOMMUTLBEvent *event, void *private) { --=20 2.47.1