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a="62504911" X-IronPort-AV: E=Sophos;i="6.19,252,1754982000"; d="scan'208";a="62504911" X-CSE-ConnectionGUID: WGpqu+cuQdiylDt1ptsmdg== X-CSE-MsgGUID: kA1YJ+naTYC+jZI/wRcumg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.19,252,1754982000"; d="scan'208";a="183986088" 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, 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 v7 21/23] intel_iommu: Add migration support with x-flts=on Date: Fri, 24 Oct 2025 04:43:45 -0400 Message-ID: <20251024084349.102322-22-zhenzhong.duan@intel.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20251024084349.102322-1-zhenzhong.duan@intel.com> References: <20251024084349.102322-1-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; 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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 --- 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 edd1416382..8fec61be3e 100644 --- a/hw/i386/intel_iommu.c +++ b/hw/i386/intel_iommu.c @@ -4360,6 +4360,13 @@ 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 restore device's DMA. + */ + vtd_replay_pasid_bindings_all(iommu); + return 0; } =20 --=20 2.47.1