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a="68851961" X-IronPort-AV: E=Sophos;i="6.17,309,1747724400"; d="scan'208";a="68851961" X-CSE-ConnectionGUID: pmph73UrTyKZCDeHRNEMAw== X-CSE-MsgGUID: tjkQLvGWTiiaSmhi5yA64g== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.17,309,1747724400"; d="scan'208";a="168245050" 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, joao.m.martins@oracle.com, clement.mathieu--drif@eviden.com, kevin.tian@intel.com, yi.l.liu@intel.com, chao.p.peng@intel.com, Yi Sun , Zhenzhong Duan Subject: [PATCH v5 16/21] intel_iommu: Replay pasid bindings after context cache invalidation Date: Fri, 22 Aug 2025 02:40:54 -0400 Message-ID: <20250822064101.123526-17-zhenzhong.duan@intel.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20250822064101.123526-1-zhenzhong.duan@intel.com> References: <20250822064101.123526-1-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=192.198.163.9; 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: 1755844983112116600 Content-Type: text/plain; charset="utf-8" From: Yi Liu This replays guest pasid bindings after context cache invalidation. This is a behavior to ensure safety. Actually, programmer should issue pasid cache invalidation with proper granularity after issuing a context cache invalidation. Signed-off-by: Yi Liu Signed-off-by: Yi Sun Signed-off-by: Zhenzhong Duan --- hw/i386/intel_iommu_internal.h | 2 ++ hw/i386/intel_iommu.c | 42 ++++++++++++++++++++++++++++++++++ hw/i386/trace-events | 1 + 3 files changed, 45 insertions(+) diff --git a/hw/i386/intel_iommu_internal.h b/hw/i386/intel_iommu_internal.h index 61e35dbdc0..8af1004888 100644 --- a/hw/i386/intel_iommu_internal.h +++ b/hw/i386/intel_iommu_internal.h @@ -584,6 +584,8 @@ typedef enum VTDPCInvType { =20 /* Reset all PASID cache entries, used in system level reset */ VTD_PASID_CACHE_FORCE_RESET =3D 0x10, + /* Invalidate all PASID entries in a device */ + VTD_PASID_CACHE_DEVSI, } VTDPCInvType; =20 typedef struct VTDPASIDCacheInfo { diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c index a10ee8eb4f..6c0e502d1c 100644 --- a/hw/i386/intel_iommu.c +++ b/hw/i386/intel_iommu.c @@ -91,6 +91,10 @@ static void vtd_address_space_refresh_all(IntelIOMMUStat= e *s); static void vtd_address_space_unmap(VTDAddressSpace *as, IOMMUNotifier *n); =20 static void vtd_pasid_cache_reset_locked(IntelIOMMUState *s); +static void vtd_pasid_cache_sync(IntelIOMMUState *s, + VTDPASIDCacheInfo *pc_info); +static void vtd_pasid_cache_devsi(IntelIOMMUState *s, + PCIBus *bus, uint16_t devfn); =20 static void vtd_panic_require_caching_mode(void) { @@ -2442,6 +2446,8 @@ static void vtd_iommu_replay_all(IntelIOMMUState *s) =20 static void vtd_context_global_invalidate(IntelIOMMUState *s) { + VTDPASIDCacheInfo pc_info; + trace_vtd_inv_desc_cc_global(); /* Protects context cache */ vtd_iommu_lock(s); @@ -2459,6 +2465,9 @@ static void vtd_context_global_invalidate(IntelIOMMUS= tate *s) * VT-d emulation codes. */ vtd_iommu_replay_all(s); + + pc_info.type =3D VTD_PASID_CACHE_GLOBAL_INV; + vtd_pasid_cache_sync(s, &pc_info); } =20 #ifdef CONFIG_IOMMUFD @@ -2691,6 +2700,15 @@ static void vtd_context_device_invalidate(IntelIOMMU= State *s, * happened. */ vtd_address_space_sync(vtd_as); + /* + * Per spec, context flush should also be followed with PASID + * cache and iotlb flush. In order to work with a guest which + * doesn't follow spec and missed PASID cache flush, we have + * vtd_pasid_cache_devsi() to invalidate PASID caches of the + * passthrough device. Host iommu driver would flush piotlb + * when a pasid unbind is pass down to it. + */ + vtd_pasid_cache_devsi(s, vtd_as->bus, devfn); } } } @@ -3422,6 +3440,11 @@ static gboolean vtd_flush_pasid_locked(gpointer key,= gpointer value, break; case VTD_PASID_CACHE_FORCE_RESET: goto remove; + case VTD_PASID_CACHE_DEVSI: + if (pc_info->bus !=3D vtd_as->bus || pc_info->devfn !=3D vtd_as->d= evfn) { + return false; + } + break; default: error_setg(&error_fatal, "invalid pc_info->type for flush"); } @@ -3635,6 +3658,11 @@ static void vtd_replay_guest_pasid_bindings(IntelIOM= MUState *s, case VTD_PASID_CACHE_FORCE_RESET: /* For force reset, no need to go further replay */ return; + case VTD_PASID_CACHE_DEVSI: + walk_info.bus =3D pc_info->bus; + walk_info.devfn =3D pc_info->devfn; + vtd_replay_pasid_bind_for_dev(s, start, end, &walk_info); + return; default: error_setg(&error_fatal, "invalid pc_info->type for replay"); } @@ -3683,6 +3711,20 @@ static void vtd_pasid_cache_sync(IntelIOMMUState *s,= VTDPASIDCacheInfo *pc_info) vtd_replay_guest_pasid_bindings(s, pc_info); } =20 +static void vtd_pasid_cache_devsi(IntelIOMMUState *s, + PCIBus *bus, uint16_t devfn) +{ + VTDPASIDCacheInfo pc_info; + + trace_vtd_pasid_cache_devsi(devfn); + + pc_info.type =3D VTD_PASID_CACHE_DEVSI; + pc_info.bus =3D bus; + pc_info.devfn =3D devfn; + + vtd_pasid_cache_sync(s, &pc_info); +} + static bool vtd_process_pasid_desc(IntelIOMMUState *s, VTDInvDesc *inv_desc) { diff --git a/hw/i386/trace-events b/hw/i386/trace-events index 1c31b9a873..830b11f68b 100644 --- a/hw/i386/trace-events +++ b/hw/i386/trace-events @@ -28,6 +28,7 @@ vtd_pasid_cache_reset(void) "" vtd_pasid_cache_gsi(void) "" vtd_pasid_cache_dsi(uint16_t domain) "Domain selective PC invalidation dom= ain 0x%"PRIx16 vtd_pasid_cache_psi(uint16_t domain, uint32_t pasid) "PASID selective PC i= nvalidation domain 0x%"PRIx16" pasid 0x%"PRIx32 +vtd_pasid_cache_devsi(uint16_t devfn) "Dev selective PC invalidation dev: = 0x%"PRIx16 vtd_re_not_present(uint8_t bus) "Root entry bus %"PRIu8" not present" vtd_ce_not_present(uint8_t bus, uint8_t devfn) "Context entry bus %"PRIu8"= devfn %"PRIu8" not present" vtd_iotlb_page_hit(uint16_t sid, uint64_t addr, uint64_t slpte, uint16_t d= omain) "IOTLB page hit sid 0x%"PRIx16" iova 0x%"PRIx64" slpte 0x%"PRIx64" d= omain 0x%"PRIx16 --=20 2.47.1