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a="83666851" X-IronPort-AV: E=Sophos;i="6.21,289,1763452800"; d="scan'208";a="83666851" X-CSE-ConnectionGUID: 5PpxZZbVTZGGl63NKaPSqQ== X-CSE-MsgGUID: fpK3rWh0QVKdatcXyP5UHA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,289,1763452800"; d="scan'208";a="212933098" 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, 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, xudong.hao@intel.com, Zhenzhong Duan Subject: [RFCv2 PATCH 08/13] intel_iommu: Handle PASID entry removal for pc_inv_dsc request Date: Fri, 13 Feb 2026 22:41:28 -0500 Message-ID: <20260214034135.220413-9-zhenzhong.duan@intel.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260214034135.220413-1-zhenzhong.duan@intel.com> References: <20260214034135.220413-1-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=198.175.65.12; 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_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_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: qemu development 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: 1771040594685154100 Content-Type: text/plain; charset="utf-8" When guest deletes PASID entries, QEMU will capture the pasid cache invalidation request, walk through pasid_cache_list in each passthrough device to find stale VTDACCELPASIDCacheEntry and delete them. This happen before the PASID entry addition, because a new added entry should never be removed. Signed-off-by: Zhenzhong Duan --- hw/i386/intel_iommu_accel.c | 70 +++++++++++++++++++++++++++++++++++++ 1 file changed, 70 insertions(+) diff --git a/hw/i386/intel_iommu_accel.c b/hw/i386/intel_iommu_accel.c index 0acf3ae77f..5a956af916 100644 --- a/hw/i386/intel_iommu_accel.c +++ b/hw/i386/intel_iommu_accel.c @@ -16,6 +16,28 @@ #include "hw/pci/pci_bus.h" #include "trace.h" =20 +static inline int vtd_hiod_get_pe_from_pasid(VTDACCELPASIDCacheEntry *vtd_= pce, + VTDPASIDEntry *pe) +{ + VTDHostIOMMUDevice *vtd_hiod =3D vtd_pce->vtd_hiod; + IntelIOMMUState *s =3D vtd_hiod->iommu_state; + uint32_t pasid =3D vtd_pce->pasid; + VTDContextEntry ce; + int ret; + + if (!s->dmar_enabled || !s->root_scalable) { + return -VTD_FR_RTADDR_INV_TTM; + } + + ret =3D vtd_dev_to_context_entry(s, pci_bus_num(vtd_hiod->bus), + vtd_hiod->devfn, &ce); + if (ret) { + return ret; + } + + return vtd_ce_get_pasid_entry(s, &ce, pe, pasid); +} + bool vtd_check_hiod_accel(IntelIOMMUState *s, VTDHostIOMMUDevice *vtd_hiod, Error **errp) { @@ -257,6 +279,52 @@ void vtd_flush_host_piotlb_all_locked(IntelIOMMUState = *s, uint16_t domain_id, vtd_flush_host_piotlb_locked, &piotlb_info); } =20 +static void vtd_pasid_cache_invalidate_one(VTDACCELPASIDCacheEntry *vtd_pc= e, + VTDPASIDCacheInfo *pc_info) +{ + VTDPASIDEntry pe; + uint16_t did; + + /* + * VTD_INV_DESC_PASIDC_G_DSI and VTD_INV_DESC_PASIDC_G_PASID_SI require + * DID check. If DID doesn't match the value in cache or memory, then + * it's not a pasid entry we want to invalidate. + */ + switch (pc_info->type) { + case VTD_INV_DESC_PASIDC_G_PASID_SI: + if (pc_info->pasid !=3D vtd_pce->pasid) { + return; + } + /* Fall through */ + case VTD_INV_DESC_PASIDC_G_DSI: + did =3D VTD_SM_PASID_ENTRY_DID(&vtd_pce->pe); + if (pc_info->did !=3D did) { + return; + } + } + + if (vtd_hiod_get_pe_from_pasid(vtd_pce, &pe)) { + /* + * No valid pasid entry in guest memory. e.g. pasid entry was modi= fied + * to be either all-zero or non-present. Either case means existing + * pasid cache should be invalidated. + */ + QLIST_REMOVE(vtd_pce, next); + g_free(vtd_pce); + } +} + +/* Delete invalid pasid cache entry from pasid_cache_list */ +static void vtd_pasid_cache_invalidate(VTDHostIOMMUDevice *vtd_hiod, + VTDPASIDCacheInfo *pc_info) +{ + VTDACCELPASIDCacheEntry *vtd_pce, *next; + + QLIST_FOREACH_SAFE(vtd_pce, &vtd_hiod->pasid_cache_list, next, next) { + vtd_pasid_cache_invalidate_one(vtd_pce, pc_info); + } +} + static void vtd_find_add_pc(VTDHostIOMMUDevice *vtd_hiod, uint32_t pasid, VTDPASIDEntry *pe) { @@ -423,6 +491,8 @@ void vtd_pasid_cache_sync_accel(IntelIOMMUState *s, VTD= PASIDCacheInfo *pc_info) TYPE_HOST_IOMMU_DEVICE_IOMMUFD)) { continue; } + + vtd_pasid_cache_invalidate(vtd_hiod, pc_info); vtd_replay_pasid_bind_for_dev(vtd_hiod, start, end, pc_info); } } --=20 2.47.3