From: Yuxue Liu <yuxue....@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 interrupt.
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....@jaguarmicro.com>
Message-Id: <20240411073555.1357-1-yuxue....@jaguarmicro.com>
Reviewed-by: Michael S. Tsirkin <m...@redhat.com>
Signed-off-by: Michael S. Tsirkin <m...@redhat.com>
---
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,
--
MST
