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a="49895189" X-IronPort-AV: E=Sophos;i="6.15,303,1739865600"; d="scan'208";a="49895189" X-CSE-ConnectionGUID: QoAm9oVGSpq3njSP1vdh4Q== X-CSE-MsgGUID: HO3eWI+9R8WXXww3ozt3dw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.15,303,1739865600"; d="scan'208";a="145158496" 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 , Marcel Apfelbaum , Paolo Bonzini , Richard Henderson , Eduardo Habkost Subject: [PATCH rfcv3 20/21] intel_iommu: Bypass replay in stage-1 page table mode Date: Wed, 21 May 2025 19:14:50 +0800 Message-Id: <20250521111452.3316354-21-zhenzhong.duan@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250521111452.3316354-1-zhenzhong.duan@intel.com> References: <20250521111452.3316354-1-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=192.198.163.14; envelope-from=zhenzhong.duan@intel.com; helo=mgamail.intel.com X-Spam_score_int: -45 X-Spam_score: -4.6 X-Spam_bar: ---- X-Spam_report: (-4.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.184, 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: 1747826553025116600 Content-Type: text/plain; charset="utf-8" VFIO utilizes replay to setup initial shadow iommu mappings. But when stage-1 page table is configured, it is passed to host to construct nested page table, there is no replay needed. Signed-off-by: Zhenzhong Duan --- hw/i386/intel_iommu.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c index b8f3b8effa..e7c662f609 100644 --- a/hw/i386/intel_iommu.c +++ b/hw/i386/intel_iommu.c @@ -5768,6 +5768,14 @@ static void vtd_iommu_replay(IOMMUMemoryRegion *iomm= u_mr, IOMMUNotifier *n) VTDContextEntry ce; DMAMap map =3D { .iova =3D 0, .size =3D HWADDR_MAX }; =20 + /* + * Replay on stage-1 page table is meaningless as stage-1 page table + * is passthroughed to host to construct nested page table + */ + if (s->flts && s->root_scalable) { + return; + } + /* replay is protected by BQL, page walk will re-setup it safely */ iova_tree_remove(vtd_as->iova_tree, map); =20 --=20 2.34.1