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GET /api/1.0/patches/2175437/?format=api
{ "id": 2175437, "url": "http://patchwork.ozlabs.org/api/1.0/patches/2175437/?format=api", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/1.0/projects/14/?format=api", "name": "QEMU Development", "link_name": "qemu-devel", "list_id": "qemu-devel.nongnu.org", "list_email": "qemu-devel@nongnu.org", "web_url": "", "scm_url": "", "webscm_url": "" }, "msgid": "<20251218062643.624796-8-zhenzhong.duan@intel.com>", "date": "2025-12-18T06:26:28", "name": "[v6,7/9] vfio/listener: Add missing dirty tracking in region_del", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "f423bf2f3c442f7bc219533ec962258ea2c88d4c", "submitter": { "id": 81636, "url": "http://patchwork.ozlabs.org/api/1.0/people/81636/?format=api", "name": "Duan, Zhenzhong", "email": "zhenzhong.duan@intel.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20251218062643.624796-8-zhenzhong.duan@intel.com/mbox/", "series": [ { "id": 485789, "url": "http://patchwork.ozlabs.org/api/1.0/series/485789/?format=api", "date": "2025-12-18T06:26:21", "name": "vfio: relax the vIOMMU check", "version": 6, "mbox": "http://patchwork.ozlabs.org/series/485789/mbox/" } ], "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2175437/checks/", "tags": {}, "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256\n header.s=Intel header.b=eDnsPpkN;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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a=\"68028564\"", "E=Sophos;i=\"6.21,156,1763452800\"; d=\"scan'208\";a=\"68028564\"", "E=Sophos;i=\"6.21,156,1763452800\"; d=\"scan'208\";a=\"203569902\"" ], "X-ExtLoop1": "1", "From": "Zhenzhong Duan <zhenzhong.duan@intel.com>", "To": "qemu-devel@nongnu.org", "Cc": "alex@shazbot.org, clg@redhat.com, mst@redhat.com, jasowang@redhat.com,\n yi.l.liu@intel.com, clement.mathieu--drif@eviden.com,\n eric.auger@redhat.com, joao.m.martins@oracle.com, avihaih@nvidia.com,\n xudong.hao@intel.com, giovanni.cabiddu@intel.com, rohith.s.r@intel.com,\n mark.gross@intel.com, arjan.van.de.ven@intel.com,\n Zhenzhong Duan <zhenzhong.duan@intel.com>", "Subject": "[PATCH v6 7/9] vfio/listener: Add missing dirty tracking in\n region_del", "Date": "Thu, 18 Dec 2025 01:26:28 -0500", "Message-ID": "<20251218062643.624796-8-zhenzhong.duan@intel.com>", "X-Mailer": "git-send-email 2.47.1", "In-Reply-To": "<20251218062643.624796-1-zhenzhong.duan@intel.com>", "References": "<20251218062643.624796-1-zhenzhong.duan@intel.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Received-SPF": "pass client-ip=198.175.65.18;\n 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,\n DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001,\n RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001,\n 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": "<qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "If a VFIO device in guest switches from passthrough(PT) domain to block\ndomain, the whole memory address space is unmapped, but we passed a NULL\niotlb entry to unmap_bitmap, then bitmap query didn't happen and we lost\ndirty pages.\n\nBy constructing an iotlb entry with iova = gpa for unmap_bitmap, it can\nset dirty bits correctly.\n\nFor IOMMU address space, we still send NULL iotlb because VFIO don't know\nthe actual mappings in guest. It's vIOMMU's responsibility to send actual\nunmapping notifications, e.g., vtd_address_space_unmap_in_dirty_tracking().\n\nSigned-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>\nTested-by: Giovannio Cabiddu <giovanni.cabiddu@intel.com>\nReviewed-by: Yi Liu <yi.l.liu@intel.com>\n---\n hw/vfio/listener.c | 22 +++++++++++++++++++++-\n 1 file changed, 21 insertions(+), 1 deletion(-)", "diff": "diff --git a/hw/vfio/listener.c b/hw/vfio/listener.c\nindex 2109101158..35675e0ed7 100644\n--- a/hw/vfio/listener.c\n+++ b/hw/vfio/listener.c\n@@ -713,14 +713,34 @@ static void vfio_listener_region_del(MemoryListener *listener,\n \n if (try_unmap) {\n bool unmap_all = false;\n+ IOMMUTLBEntry entry = {}, *iotlb = NULL;\n \n if (int128_eq(llsize, int128_2_64())) {\n assert(!iova);\n unmap_all = true;\n llsize = int128_zero();\n }\n+\n+ /*\n+ * Fake an IOTLB entry for identity mapping which is needed by dirty\n+ * tracking when switch out of PT domain. In fact, in unmap_bitmap,\n+ * only translated_addr field is used to set dirty bitmap.\n+ *\n+ * Note: When switch into PT domain from DMA domain, the whole IOMMU\n+ * MR is deleted without iotlb, before that happen, we depend on\n+ * vIOMMU to send unmap notification with accurate iotlb entry to\n+ * VFIO. See vtd_address_space_unmap_in_dirty_tracking() for example,\n+ * it is triggered during switching to block domain because vtd does\n+ * not support direct switching from DMA to PT domain.\n+ */\n+ if (global_dirty_tracking && memory_region_is_ram(section->mr)) {\n+ entry.iova = iova;\n+ entry.translated_addr = iova;\n+ iotlb = &entry;\n+ }\n+\n ret = vfio_container_dma_unmap(bcontainer, iova, int128_get64(llsize),\n- NULL, unmap_all);\n+ iotlb, unmap_all);\n if (ret) {\n error_report(\"vfio_container_dma_unmap(%p, 0x%\"HWADDR_PRIx\", \"\n \"0x%\"HWADDR_PRIx\") = %d (%s)\",\n", "prefixes": [ "v6", "7/9" ] }