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a="62504898" X-IronPort-AV: E=Sophos;i="6.19,252,1754982000"; d="scan'208";a="62504898" X-CSE-ConnectionGUID: ec/oKx0oS6e/Lg56v50fTA== X-CSE-MsgGUID: gxMCIjgVRMCP4l+CLhW0iQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.19,252,1754982000"; d="scan'208";a="183986039" 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 18/23] vfio: Add a new element bypass_ro in VFIOContainer Date: Fri, 24 Oct 2025 04:43:42 -0400 Message-ID: <20251024084349.102322-19-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-Type: text/plain; charset="utf-8" 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=192.198.163.19; 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_MSPIKE_H2=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_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: 1761295599603158500 When bypass_ro is true, readonly memory section is bypassed from mapping in the container. This is a preparing patch to workaround Intel ERRATA_772415, see changelog in next patch for details about the errata. Signed-off-by: Zhenzhong Duan Reviewed-by: C=C3=A9dric Le Goater --- include/hw/vfio/vfio-container.h | 1 + hw/vfio/listener.c | 21 ++++++++++++++------- 2 files changed, 15 insertions(+), 7 deletions(-) diff --git a/include/hw/vfio/vfio-container.h b/include/hw/vfio/vfio-contai= ner.h index 9f6e8cedfc..a7d5c5ed67 100644 --- a/include/hw/vfio/vfio-container.h +++ b/include/hw/vfio/vfio-container.h @@ -52,6 +52,7 @@ struct VFIOContainer { QLIST_HEAD(, VFIODevice) device_list; GList *iova_ranges; NotifierWithReturn cpr_reboot_notifier; + bool bypass_ro; }; =20 #define TYPE_VFIO_IOMMU "vfio-iommu" diff --git a/hw/vfio/listener.c b/hw/vfio/listener.c index 2109101158..0862b2b834 100644 --- a/hw/vfio/listener.c +++ b/hw/vfio/listener.c @@ -76,8 +76,13 @@ static bool vfio_log_sync_needed(const VFIOContainer *bc= ontainer) return true; } =20 -static bool vfio_listener_skipped_section(MemoryRegionSection *section) +static bool vfio_listener_skipped_section(MemoryRegionSection *section, + bool bypass_ro) { + if (bypass_ro && section->readonly) { + return true; + } + return (!memory_region_is_ram(section->mr) && !memory_region_is_iommu(section->mr)) || memory_region_is_protected(section->mr) || @@ -368,9 +373,9 @@ static bool vfio_known_safe_misalignment(MemoryRegionSe= ction *section) } =20 static bool vfio_listener_valid_section(MemoryRegionSection *section, - const char *name) + bool bypass_ro, const char *name) { - if (vfio_listener_skipped_section(section)) { + if (vfio_listener_skipped_section(section, bypass_ro)) { trace_vfio_listener_region_skip(name, section->offset_within_address_space, section->offset_within_address_space + @@ -497,7 +502,8 @@ void vfio_container_region_add(VFIOContainer *bcontaine= r, int ret; Error *err =3D NULL; =20 - if (!vfio_listener_valid_section(section, "region_add")) { + if (!vfio_listener_valid_section(section, bcontainer->bypass_ro, + "region_add")) { return; } =20 @@ -663,7 +669,8 @@ static void vfio_listener_region_del(MemoryListener *li= stener, int ret; bool try_unmap =3D true; =20 - if (!vfio_listener_valid_section(section, "region_del")) { + if (!vfio_listener_valid_section(section, bcontainer->bypass_ro, + "region_del")) { return; } =20 @@ -821,7 +828,7 @@ static void vfio_dirty_tracking_update(MemoryListener *= listener, container_of(listener, VFIODirtyRangesListener, listener); hwaddr iova, end; =20 - if (!vfio_listener_valid_section(section, "tracking_update") || + if (!vfio_listener_valid_section(section, false, "tracking_update") || !vfio_get_section_iova_range(dirty->bcontainer, section, &iova, &end, NULL)) { return; @@ -1215,7 +1222,7 @@ static void vfio_listener_log_sync(MemoryListener *li= stener, int ret; Error *local_err =3D NULL; =20 - if (vfio_listener_skipped_section(section)) { + if (vfio_listener_skipped_section(section, false)) { return; } =20 --=20 2.47.1