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AJvYcCXKwQ7UqBmB7lMuSiu7C3bf2CKkjHLMe5PSIiKcY+U/Loeo9GIZv+DbP+4zwG3ZC6sXlWYF8rvFzUhSZUg=@vger.kernel.org X-Gm-Message-State: AOJu0YzsNVir0zpnNLLBlVkj1mtDXfK1pdDLeHoHQThzMyeD+MeOZiNy cGtFJKgj41yC3weUdWi7qsviCfArbLYWhy0xrtjoXc/LTtz82p9dj4IVWXfru8kTaA0dS2jN3Hb xHt9ciqFGrZOTBw== X-Received: from plge5.prod.google.com ([2002:a17:902:cf45:b0:2a3:1bf9:d25]) (user=dmatlack job=prod-delivery.src-stubby-dispatcher) by 2002:a17:902:e84f:b0:2b0:7114:23cf with SMTP id d9443c01a7336-2b0827dbc37mr127246635ad.36.1774310358090; Mon, 23 Mar 2026 16:59:18 -0700 (PDT) Date: Mon, 23 Mar 2026 23:58:15 +0000 In-Reply-To: <20260323235817.1960573-1-dmatlack@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260323235817.1960573-1-dmatlack@google.com> X-Mailer: git-send-email 2.53.0.983.g0bb29b3bc5-goog Message-ID: <20260323235817.1960573-24-dmatlack@google.com> Subject: [PATCH v3 23/24] vfio: selftests: Verify that opening VFIO device fails during Live Update From: David Matlack To: Alex Williamson , Bjorn Helgaas Cc: Adithya Jayachandran , Alexander Graf , Alex Mastro , Andrew Morton , Ankit Agrawal , Arnd Bergmann , Askar Safin , "Borislav Petkov (AMD)" , Chris Li , Dapeng Mi , David Matlack , David Rientjes , Feng Tang , Jacob Pan , Jason Gunthorpe , Jason Gunthorpe , Jonathan Corbet , Josh Hilke , Kees Cook , Kevin Tian , kexec@lists.infradead.org, kvm@vger.kernel.org, Leon Romanovsky , Leon Romanovsky , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, linux-pci@vger.kernel.org, Li RongQing , Lukas Wunner , Marco Elver , "=?UTF-8?q?Micha=C5=82=20Winiarski?=" , Mike Rapoport , Parav Pandit , Pasha Tatashin , "Paul E. McKenney" , Pawan Gupta , "Peter Zijlstra (Intel)" , Pranjal Shrivastava , Pratyush Yadav , Raghavendra Rao Ananta , Randy Dunlap , Rodrigo Vivi , Saeed Mahameed , Samiullah Khawaja , Shuah Khan , Vipin Sharma , Vivek Kasireddy , William Tu , Yi Liu , Zhu Yanjun Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Verify that opening a VFIO device through its cdev file and via VFIO_GROUP_GET_DEVICE_FD both fail with -EBUSY if the device was preserved across a Live Update. When a device file is preserve across a Live Update, the file must be retrieved from /dev/liveupdate, not from VFIO directly. Signed-off-by: David Matlack --- .../vfio/vfio_pci_liveupdate_kexec_test.c | 38 +++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/tools/testing/selftests/vfio/vfio_pci_liveupdate_kexec_test.c = b/tools/testing/selftests/vfio/vfio_pci_liveupdate_kexec_test.c index 15b3e3af91d1..65c48196e44e 100644 --- a/tools/testing/selftests/vfio/vfio_pci_liveupdate_kexec_test.c +++ b/tools/testing/selftests/vfio/vfio_pci_liveupdate_kexec_test.c @@ -36,6 +36,42 @@ static void before_kexec(int luo_fd) daemonize_and_wait(); } =20 +static void check_open_vfio_device_fails(void) +{ + const char *cdev_path =3D vfio_pci_get_cdev_path(device_bdf); + struct vfio_pci_device *device; + struct iommu *iommu; + int ret, i; + + printf("Checking open(%s) fails\n", cdev_path); + ret =3D open(cdev_path, O_RDWR); + VFIO_ASSERT_EQ(ret, -1); + VFIO_ASSERT_EQ(errno, EBUSY); + free((void *)cdev_path); + + for (i =3D 0; i < nr_iommu_modes; i++) { + if (!iommu_modes[i].container_path) + continue; + + iommu =3D iommu_init(iommu_modes[i].name); + + device =3D vfio_pci_device_alloc(device_bdf, iommu); + vfio_pci_group_setup(device); + vfio_pci_iommu_setup(device); + + printf("Checking ioctl(group_fd, VFIO_GROUP_GET_DEVICE_FD, \"%s\") fails= (%s)\n", + device_bdf, iommu_modes[i].name); + + ret =3D ioctl(device->group_fd, VFIO_GROUP_GET_DEVICE_FD, device->bdf); + VFIO_ASSERT_EQ(ret, -1); + VFIO_ASSERT_EQ(errno, EBUSY); + + close(device->group_fd); + free(device); + iommu_cleanup(iommu); + } +} + static void after_kexec(int luo_fd, int state_session_fd) { struct vfio_pci_device *device; @@ -44,6 +80,8 @@ static void after_kexec(int luo_fd, int state_session_fd) int device_fd; int stage; =20 + check_open_vfio_device_fails(); + restore_and_read_stage(state_session_fd, STATE_TOKEN, &stage); VFIO_ASSERT_EQ(stage, 2); =20 --=20 2.53.0.983.g0bb29b3bc5-goog