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a="75531373" X-IronPort-AV: E=Sophos;i="6.23,141,1770624000"; d="scan'208";a="75531373" X-CSE-ConnectionGUID: eLT+sT6MRLS13KWq8+ciWA== X-CSE-MsgGUID: bLDuV8yvTiCP4+I3ZXN4Vg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.23,141,1770624000"; d="scan'208";a="248368597" 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@bull.com, kevin.tian@intel.com, yi.l.liu@intel.com, xudong.hao@intel.com, Zhenzhong Duan Subject: [PATCH v2 09/14] intel_iommu_accel: Bypass PASID entry addition for just deleted entry Date: Thu, 26 Mar 2026 05:11:23 -0400 Message-ID: <20260326091130.321483-10-zhenzhong.duan@intel.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260326091130.321483-1-zhenzhong.duan@intel.com> References: <20260326091130.321483-1-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=198.175.65.17; 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_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: 1774516395093158500 Content-Type: text/plain; charset="utf-8" For VTD_INV_DESC_PASIDC_G_PASID_SI typed pc_inv_dsc invalidation, if an pasid entry is just removed, it can never be a new entry to add. So calling vtd_replay_pasid_bind_for_dev() is unnecessary. Introduce a new field accel_pce_deleted in VTDPASIDCacheInfo to mark this case and to do the bypassing. Suggested-by: Yi Liu Signed-off-by: Zhenzhong Duan --- hw/i386/intel_iommu_internal.h | 1 + hw/i386/intel_iommu_accel.c | 11 ++++++++++- 2 files changed, 11 insertions(+), 1 deletion(-) diff --git a/hw/i386/intel_iommu_internal.h b/hw/i386/intel_iommu_internal.h index d5f212ded9..f3cb6cff1c 100644 --- a/hw/i386/intel_iommu_internal.h +++ b/hw/i386/intel_iommu_internal.h @@ -631,6 +631,7 @@ typedef struct VTDPASIDCacheInfo { uint8_t type; uint16_t did; uint32_t pasid; + bool accel_pce_deleted; } VTDPASIDCacheInfo; =20 typedef struct VTDPIOTLBInvInfo { diff --git a/hw/i386/intel_iommu_accel.c b/hw/i386/intel_iommu_accel.c index c1285ce331..1e27c0feb8 100644 --- a/hw/i386/intel_iommu_accel.c +++ b/hw/i386/intel_iommu_accel.c @@ -311,6 +311,10 @@ static void vtd_pasid_cache_invalidate_one(VTDAccelPAS= IDCacheEntry *vtd_pce, */ QLIST_REMOVE(vtd_pce, next); g_free(vtd_pce); + + if (pc_info->type =3D=3D VTD_INV_DESC_PASIDC_G_PASID_SI) { + pc_info->accel_pce_deleted =3D true; + } } } =20 @@ -498,7 +502,12 @@ void vtd_pasid_cache_sync_accel(IntelIOMMUState *s, VT= DPASIDCacheInfo *pc_info) * removed. */ vtd_pasid_cache_invalidate(vtd_hiod, pc_info); - vtd_replay_pasid_bind_for_dev(vtd_hiod, start, end, pc_info); + + if (pc_info->accel_pce_deleted) { + pc_info->accel_pce_deleted =3D false; + } else { + vtd_replay_pasid_bind_for_dev(vtd_hiod, start, end, pc_info); + } } } =20 --=20 2.47.3