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a="71305096" X-IronPort-AV: E=Sophos;i="6.21,150,1763452800"; d="scan'208";a="71305096" X-CSE-ConnectionGUID: cW6yZOTlTtCHmf9nDylsig== X-CSE-MsgGUID: NCzSin3TT3Ou1/Vl9AD2Ew== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,150,1763452800"; d="scan'208";a="197408875" 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, peterx@redhat.com, ddutile@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, chao.p.peng@intel.com, Zhenzhong Duan Subject: [PATCH v9 17/19] intel_iommu: Add migration support with x-flts=on Date: Mon, 15 Dec 2025 01:50:41 -0500 Message-ID: <20251215065046.86991-18-zhenzhong.duan@intel.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20251215065046.86991-1-zhenzhong.duan@intel.com> References: <20251215065046.86991-1-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=198.175.65.15; 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: 1765781579377158500 Content-Type: text/plain; charset="utf-8" When x-flts=3Don, we set up bindings to nested HWPT in host, after migration, VFIO device binds to nesting parent HWPT by default. We need to re-establish the bindings to nested HWPT, or else device DMA will break. Signed-off-by: Zhenzhong Duan Reviewed-by: Eric Auger --- hw/i386/intel_iommu.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c index 7e304e2988..7220a3d9f4 100644 --- a/hw/i386/intel_iommu.c +++ b/hw/i386/intel_iommu.c @@ -4090,6 +4090,13 @@ static int vtd_post_load(void *opaque, int version_i= d) */ vtd_switch_address_space_all(iommu); =20 + /* + * Bindings to nested HWPT in host is set up dynamically depending + * on pasid entry configuration from guest. After migration, we + * need to re-establish the bindings before restoring device's DMA. + */ + vtd_replay_pasid_bindings_all(iommu); + return 0; } =20 --=20 2.47.1