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a="57974047" X-IronPort-AV: E=Sophos;i="6.16,297,1744095600"; d="scan'208";a="57974047" X-CSE-ConnectionGUID: pvfe/nTYQaGtjJMeiqoOLQ== X-CSE-MsgGUID: C5dkz0PCSiC4adZgOh/0Ug== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.16,297,1744095600"; d="scan'208";a="192647991" 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 v3 13/20] intel_iommu: Stick to system MR for IOMMUFD backed host device when x-fls=on Date: Tue, 8 Jul 2025 07:05:54 -0400 Message-ID: <20250708110601.633308-14-zhenzhong.duan@intel.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20250708110601.633308-1-zhenzhong.duan@intel.com> References: <20250708110601.633308-1-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=198.175.65.14; 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: 1752009879268116600 Content-Type: text/plain; charset="utf-8" When guest in scalable mode and x-flts=3Don, we stick to system MR for IOMM= UFD backed host device. Then its default hwpt contains GPA->HPA mappings which = is used directly if PGTT=3DPT and used as nested parent if PGTT=3DFLT. Otherwi= se fallback to original processing. Suggested-by: Yi Liu Signed-off-by: Zhenzhong Duan --- hw/i386/intel_iommu.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c index cf263498db..030862fb2f 100644 --- a/hw/i386/intel_iommu.c +++ b/hw/i386/intel_iommu.c @@ -1773,6 +1773,28 @@ static bool vtd_dev_pt_enabled(IntelIOMMUState *s, V= TDContextEntry *ce, =20 } =20 +static VTDHostIOMMUDevice *vtd_find_hiod_iommufd(IntelIOMMUState *s, + VTDAddressSpace *as) +{ + struct vtd_as_key key =3D { + .bus =3D as->bus, + .devfn =3D as->devfn, + }; + VTDHostIOMMUDevice *vtd_hiod =3D g_hash_table_lookup(s->vtd_host_iommu= _dev, + &key); + + if (vtd_hiod && vtd_hiod->hiod && + object_dynamic_cast(OBJECT(vtd_hiod->hiod), + TYPE_HOST_IOMMU_DEVICE_IOMMUFD)) { + return vtd_hiod; + } + return NULL; +} + +/* + * vtd_switch_address_space() calls vtd_as_pt_enabled() to determine which + * MR to switch to. Switch to system MR if return true, iommu MR otherwise. + */ static bool vtd_as_pt_enabled(VTDAddressSpace *as) { IntelIOMMUState *s; @@ -1781,6 +1803,18 @@ static bool vtd_as_pt_enabled(VTDAddressSpace *as) assert(as); =20 s =3D as->iommu_state; + + /* + * When guest in scalable mode and x-flts=3Don, we stick to system MR + * for IOMMUFD backed host device. Then its default hwpt contains + * GPA->HPA mappings which is used directly if PGTT=3DPT and used as + * nested parent if PGTT=3DFLT. Otherwise fallback to original + * processing. + */ + if (s->root_scalable && s->flts && vtd_find_hiod_iommufd(s, as)) { + return true; + } + if (vtd_dev_to_context_entry(s, pci_bus_num(as->bus), as->devfn, &ce)) { /* --=20 2.47.1