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[PULL,40/91] vhost-user-test: don't set call fd -1 non-blocking

Message ID ec1a0a63ed7038ffdcdfbfa1d4542cf32f13cd3a.1719929191.git.mst@redhat.com
State New
Headers show
Series [PULL,01/91] vhost: dirty log should be per backend type | expand

Commit Message

Michael S. Tsirkin July 2, 2024, 2:09 p.m. UTC 
From: Yuxue Liu <yuxue.liu@jaguarmicro.com>

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 <yuxue.liu@jaguarmicro.com>
Message-Id: <20240411073555.1357-1-yuxue.liu@jaguarmicro.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 tests/qtest/vhost-user-test.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
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Patch

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,