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a="65924081" X-IronPort-AV: E=Sophos;i="6.20,217,1758610800"; d="scan'208";a="65924081" X-CSE-ConnectionGUID: XMdUcYobS7yqqBHu5m1Yag== X-CSE-MsgGUID: T83Tey3ZQlqTwgdTcFVCOg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.20,217,1758610800"; d="scan'208";a="191064615" From: Vivek Kasireddy To: qemu-devel@nongnu.org Cc: Vivek Kasireddy , Alex Williamson , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= Subject: [PATCH v3 5/9] vfio/device: Add a helper to lookup VFIODevice from memory region Date: Fri, 21 Nov 2025 22:46:26 -0800 Message-ID: <20251122064936.2948632-6-vivek.kasireddy@intel.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20251122064936.2948632-1-vivek.kasireddy@intel.com> References: <20251122064936.2948632-1-vivek.kasireddy@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=192.198.163.14; envelope-from=vivek.kasireddy@intel.com; helo=mgamail.intel.com X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, DKIM_INVALID=0.1, DKIM_SIGNED=0.1, T_SPF_HELO_TEMPERROR=0.01, T_SPF_TEMPERROR=0.01 autolearn=no 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: 1763797691624018900 Instead of iterating over all QOM devices to find the VFIODevice associated with a memory region, it is faster to just use the vfio_device_list to lookup the VFIODevice. Cc: Alex Williamson Cc: C=C3=A9dric Le Goater Signed-off-by: Vivek Kasireddy --- hw/vfio/device.c | 12 ++++++++++++ include/hw/vfio/vfio-device.h | 9 +++++++++ 2 files changed, 21 insertions(+) diff --git a/hw/vfio/device.c b/hw/vfio/device.c index 76869828fc..9ff73f9941 100644 --- a/hw/vfio/device.c +++ b/hw/vfio/device.c @@ -603,3 +603,15 @@ static VFIODeviceIOOps vfio_device_io_ops_ioctl =3D { .region_read =3D vfio_device_io_region_read, .region_write =3D vfio_device_io_region_write, }; + +VFIODevice *vfio_device_lookup(MemoryRegion *mr) +{ + VFIODevice *vbasedev; + + QLIST_FOREACH(vbasedev, &vfio_device_list, next) { + if (vbasedev->dev =3D=3D mr->dev) { + return vbasedev; + } + } + return NULL; +} diff --git a/include/hw/vfio/vfio-device.h b/include/hw/vfio/vfio-device.h index 44cacd3728..2f8087f133 100644 --- a/include/hw/vfio/vfio-device.h +++ b/include/hw/vfio/vfio-device.h @@ -300,6 +300,15 @@ int vfio_device_get_irq_info(VFIODevice *vbasedev, int= index, * Returns the region index or -1 on error. */ int vfio_get_region_index_from_mr(MemoryRegion *mr); + +/** + * Return the VFIO device associated with a given MemoryRegion. + * + * @mr: MemoryRegion to use + * + * Returns the VFIO device if found or NULL. + */ +VFIODevice *vfio_device_lookup(MemoryRegion *mr); #endif =20 /* Returns 0 on success, or a negative errno. */ --=20 2.50.1