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a="62504903" X-IronPort-AV: E=Sophos;i="6.19,252,1754982000"; d="scan'208";a="62504903" X-CSE-ConnectionGUID: 4QGJJ0xORQS3ewrLu3G/xQ== X-CSE-MsgGUID: 3MlgoxSSRaO4FUIAzD8Nrw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.19,252,1754982000"; d="scan'208";a="183986069" 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 20/23] vfio: Bypass readonly region for dirty tracking Date: Fri, 24 Oct 2025 04:43:44 -0400 Message-ID: <20251024084349.102322-21-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 doing ditry tracking or calculating dirty tracking range, readonly regions can be bypassed, because corresponding DMA mappings are readonly and never become dirty. This can optimize dirty tracking a bit for passthrough device. Signed-off-by: Zhenzhong Duan Reviewed-by: C=C3=A9dric Le Goater --- hw/vfio/listener.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/hw/vfio/listener.c b/hw/vfio/listener.c index 0862b2b834..cbd86c79af 100644 --- a/hw/vfio/listener.c +++ b/hw/vfio/listener.c @@ -828,7 +828,8 @@ static void vfio_dirty_tracking_update(MemoryListener *= listener, container_of(listener, VFIODirtyRangesListener, listener); hwaddr iova, end; =20 - if (!vfio_listener_valid_section(section, false, "tracking_update") || + /* Bypass readonly section as it never become dirty */ + if (!vfio_listener_valid_section(section, true, "tracking_update") || !vfio_get_section_iova_range(dirty->bcontainer, section, &iova, &end, NULL)) { return; @@ -1087,6 +1088,12 @@ static void vfio_iommu_map_dirty_notify(IOMMUNotifie= r *n, IOMMUTLBEntry *iotlb) if (!mr) { goto out_unlock; } + + if (!(iotlb->perm & IOMMU_WO) || mr->readonly) { + rcu_read_unlock(); + return; + } + translated_addr =3D memory_region_get_ram_addr(mr) + xlat; =20 ret =3D vfio_container_query_dirty_bitmap(bcontainer, iova, iotlb->add= r_mask + 1, @@ -1222,7 +1229,7 @@ static void vfio_listener_log_sync(MemoryListener *li= stener, int ret; Error *local_err =3D NULL; =20 - if (vfio_listener_skipped_section(section, false)) { + if (vfio_listener_skipped_section(section, true)) { return; } =20 --=20 2.47.1