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AJvYcCVzYVZSZyMVtwpbJZt8ms8HwE8t6+6md0+0k1bz8+4fNvPXyHjbgIBi9eIh7V3O0vpqIqQ/gcng8gRGTZM=@vger.kernel.org X-Gm-Message-State: AOJu0YxKzQ0HKuL6AC+CFOONpsa9+GEB1+2CwjyPOydwOc0+mu8uFZ6A u3YmduPrw973Rn56PsOwoiPJjC7w00swgzT9HFi/kR4ETmMpxOdakPIWAtTPd88M54QGeht65JW NA0ZfqwdQfO1Sew== X-Received: from pjps20.prod.google.com ([2002:a17:90a:a114:b0:352:ca2d:ce63]) (user=dmatlack job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90a:d64e:b0:341:2b78:61b8 with SMTP id 98e67ed59e1d1-3543b3d65f8mr671636a91.20.1769721963975; Thu, 29 Jan 2026 13:26:03 -0800 (PST) Date: Thu, 29 Jan 2026 21:25:03 +0000 In-Reply-To: <20260129212510.967611-1-dmatlack@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260129212510.967611-1-dmatlack@google.com> X-Mailer: git-send-email 2.53.0.rc1.225.gd81095ad13-goog Message-ID: <20260129212510.967611-17-dmatlack@google.com> Subject: [PATCH v2 16/22] vfio: selftests: Add vfio_pci_liveupdate_uapi_test From: David Matlack To: Alex Williamson Cc: Adithya Jayachandran , Alexander Graf , Alex Mastro , Alistair Popple , Andrew Morton , Ankit Agrawal , Bjorn Helgaas , Chris Li , David Matlack , David Rientjes , Jacob Pan , Jason Gunthorpe , Jason Gunthorpe , Jonathan Corbet , Josh Hilke , 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, Lukas Wunner , "=?UTF-8?q?Micha=C5=82=20Winiarski?=" , Mike Rapoport , Parav Pandit , Pasha Tatashin , Pranjal Shrivastava , Pratyush Yadav , Raghavendra Rao Ananta , Rodrigo Vivi , Saeed Mahameed , Samiullah Khawaja , Shuah Khan , "=?UTF-8?q?Thomas=20Hellstr=C3=B6m?=" , Tomita Moeko , Vipin Sharma , Vivek Kasireddy , William Tu , Yi Liu , Zhu Yanjun Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add a selftest to exercise preserving a various VFIO files through /dev/liveupdate. Ensure that VFIO cdev device files can be preserved and everything else (group-based device files, group files, and container files) all fail. Signed-off-by: David Matlack --- tools/testing/selftests/vfio/Makefile | 1 + .../vfio/vfio_pci_liveupdate_uapi_test.c | 93 +++++++++++++++++++ 2 files changed, 94 insertions(+) create mode 100644 tools/testing/selftests/vfio/vfio_pci_liveupdate_uapi_t= est.c diff --git a/tools/testing/selftests/vfio/Makefile b/tools/testing/selftest= s/vfio/Makefile index f9c040094d4a..666310872217 100644 --- a/tools/testing/selftests/vfio/Makefile +++ b/tools/testing/selftests/vfio/Makefile @@ -4,6 +4,7 @@ TEST_GEN_PROGS +=3D vfio_iommufd_setup_test TEST_GEN_PROGS +=3D vfio_pci_device_test TEST_GEN_PROGS +=3D vfio_pci_device_init_perf_test TEST_GEN_PROGS +=3D vfio_pci_driver_test +TEST_GEN_PROGS +=3D vfio_pci_liveupdate_uapi_test =20 TEST_FILES +=3D scripts/cleanup.sh TEST_FILES +=3D scripts/lib.sh diff --git a/tools/testing/selftests/vfio/vfio_pci_liveupdate_uapi_test.c b= /tools/testing/selftests/vfio/vfio_pci_liveupdate_uapi_test.c new file mode 100644 index 000000000000..3b4276b2532c --- /dev/null +++ b/tools/testing/selftests/vfio/vfio_pci_liveupdate_uapi_test.c @@ -0,0 +1,93 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include +#include +#include + +static const char *device_bdf; + +FIXTURE(vfio_pci_liveupdate_uapi_test) { + int luo_fd; + int session_fd; + struct iommu *iommu; + struct vfio_pci_device *device; +}; + +FIXTURE_VARIANT(vfio_pci_liveupdate_uapi_test) { + const char *iommu_mode; +}; + +#define FIXTURE_VARIANT_ADD_IOMMU_MODE(_iommu_mode) \ +FIXTURE_VARIANT_ADD(vfio_pci_liveupdate_uapi_test, _iommu_mode) { \ + .iommu_mode =3D #_iommu_mode, \ +} + +FIXTURE_VARIANT_ADD_ALL_IOMMU_MODES(); +#undef FIXTURE_VARIANT_ADD_IOMMU_MODE + +FIXTURE_SETUP(vfio_pci_liveupdate_uapi_test) +{ + self->luo_fd =3D luo_open_device(); + ASSERT_GE(self->luo_fd, 0); + + self->session_fd =3D luo_create_session(self->luo_fd, "session"); + ASSERT_GE(self->session_fd, 0); + + self->iommu =3D iommu_init(variant->iommu_mode); + self->device =3D vfio_pci_device_init(device_bdf, self->iommu); +} + +FIXTURE_TEARDOWN(vfio_pci_liveupdate_uapi_test) +{ + vfio_pci_device_cleanup(self->device); + iommu_cleanup(self->iommu); + close(self->session_fd); + close(self->luo_fd); +} + +TEST_F(vfio_pci_liveupdate_uapi_test, preserve_device) +{ + int ret; + + ret =3D luo_session_preserve_fd(self->session_fd, self->device->fd, 0); + + /* Preservation should only be supported for VFIO cdev files. */ + ASSERT_EQ(ret, self->iommu->iommufd ? 0 : -ENOENT); +} + +TEST_F(vfio_pci_liveupdate_uapi_test, preserve_group_fails) +{ + int ret; + + if (self->iommu->iommufd) + return; + + ret =3D luo_session_preserve_fd(self->session_fd, self->device->group_fd,= 0); + ASSERT_EQ(ret, -ENOENT); +} + +TEST_F(vfio_pci_liveupdate_uapi_test, preserve_container_fails) +{ + int ret; + + if (self->iommu->iommufd) + return; + + ret =3D luo_session_preserve_fd(self->session_fd, self->iommu->container_= fd, 0); + ASSERT_EQ(ret, -ENOENT); +} + +int main(int argc, char *argv[]) +{ + int fd; + + fd =3D luo_open_device(); + if (fd < 0) { + printf("open(%s) failed: %s, skipping\n", LUO_DEVICE, strerror(errno)); + return KSFT_SKIP; + } + close(fd); + + device_bdf =3D vfio_selftests_get_bdf(&argc, argv); + return test_harness_run(argc, argv); +} --=20 2.53.0.rc1.225.gd81095ad13-goog