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Tsirkin" To: qemu-devel@nongnu.org Cc: Peter Maydell , Yuxue Liu , Thomas Huth , Laurent Vivier , Paolo Bonzini Subject: [PULL 40/91] vhost-user-test: don't set call fd -1 non-blocking Message-ID: References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Mailer: git-send-email 2.27.0.106.g8ac3dc51b1 X-Mutt-Fcc: =sent Received-SPF: pass client-ip=170.10.129.124; envelope-from=mst@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Yuxue Liu In the scenario where vhost-user sets eventfd to -1, qemu_chr_fe_get_msgfds retrieves fd as -1. When vhost_user_read receives, it does not perform blocking operations on the descriptor with fd=-1, so non-blocking operations should not be performed here either. This is a normal use case. Calling g_unix_set_fd_nonblocking at this point will cause the test to fail with an assert. When vhost_user_write sets the call fd to -1, it sets the number of fds to 0, so the fds obtained by qemu_chr_fe_get_msgfds will also be 0. Signed-off-by: Yuxue Liu Message-Id: <20240411073555.1357-1-yuxue.liu@jaguarmicro.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- tests/qtest/vhost-user-test.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/tests/qtest/vhost-user-test.c b/tests/qtest/vhost-user-test.c index d4e437265f..255bde54ab 100644 --- a/tests/qtest/vhost-user-test.c +++ b/tests/qtest/vhost-user-test.c @@ -458,7 +458,10 @@ static void chr_read(void *opaque, const uint8_t *buf, int size) case VHOST_USER_SET_VRING_KICK: case VHOST_USER_SET_VRING_CALL: /* consume the fd */ - qemu_chr_fe_get_msgfds(chr, &fd, 1); + if (!qemu_chr_fe_get_msgfds(chr, &fd, 1) && fd < 0) { + qos_printf("call fd: %d, do not set non-blocking\n", fd); + break; + } /* * This is a non-blocking eventfd. * The receive function forces it to be blocking,