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Fri, 25 Sep 2026 09:12:07 -0700 (PDT) From: Andrea Parri To: Jason Gunthorpe , Kevin Tian Cc: Andrea Parri , Joerg Roedel , Will Deacon , Robin Murphy , Shuah Khan , Joao Martins , Alex Williamson , Yishai Hadas , iommu@lists.linux.dev, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH 4/4] iommufd/selftest: Test a zero-length dirty bitmap request Date: Fri, 25 Sep 2026 18:11:40 +0200 Message-ID: <20260925161142.189813-5-parri.andrea@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260925161142.189813-1-parri.andrea@gmail.com> References: <20260925161142.189813-1-parri.andrea@gmail.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add a GET_DIRTY_BITMAP case that passes iova = 0 with a zero length and expects -EINVAL. iova = 0 is the value that lets the zero length wrap into an accepted range; without the previous patch the request is accepted and returns success. The case runs on every variant of the dirty-tracking fixture. Tested on x86-64 under virtme-ng with CONFIG_IOMMUFD_TEST=y. Assisted-by: LLM Signed-off-by: Andrea Parri --- tools/testing/selftests/iommu/iommufd.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/tools/testing/selftests/iommu/iommufd.c b/tools/testing/selftests/iommu/iommufd.c index 47d861b3bdd7b..2b3c9e9c69ca7 100644 --- a/tools/testing/selftests/iommu/iommufd.c +++ b/tools/testing/selftests/iommu/iommufd.c @@ -2472,6 +2472,25 @@ TEST_F(iommufd_dirty_tracking, get_dirty_bitmap_overrun) test_ioctl_destroy(hwpt_id); } +TEST_F(iommufd_dirty_tracking, get_dirty_bitmap_zero_length) +{ + uint32_t ioas_id = self->ioas_id; + uint32_t hwpt_id; + + test_cmd_hwpt_alloc_iommupt(self->idev_id, ioas_id, + IOMMU_HWPT_ALLOC_DIRTY_TRACKING, + MOCK_IOMMUPT_DEFAULT, &hwpt_id); + test_cmd_set_dirty_tracking(hwpt_id, true); + + /* Only iova 0 wraps the zero length into an accepted range. */ + EXPECT_ERRNO(EINVAL, + _test_cmd_get_dirty_bitmap(self->fd, hwpt_id, 0, 0, + self->page_size, self->bitmap, + 0)); + + test_ioctl_destroy(hwpt_id); +} + /* VFIO compatibility IOCTLs */ TEST_F(iommufd, simple_ioctls) -- 2.53.0