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[PATCH v5 4/6] libvhost-user: handle NOFD flag in call/kick/err better
From: |
Johannes Berg |
Subject: |
[PATCH v5 4/6] libvhost-user: handle NOFD flag in call/kick/err better |
Date: |
Thu, 23 Jan 2020 09:17:06 +0100 |
From: Johannes Berg <address@hidden>
The code here is odd, for example will it print out invalid
file descriptor numbers that were never sent in the message.
Clean that up a bit so it's actually possible to implement
a device that uses polling.
Signed-off-by: Johannes Berg <address@hidden>
---
contrib/libvhost-user/libvhost-user.c | 24 ++++++++++++++++--------
1 file changed, 16 insertions(+), 8 deletions(-)
diff --git a/contrib/libvhost-user/libvhost-user.c
b/contrib/libvhost-user/libvhost-user.c
index 8cc3054fd510..34d08e2fc4be 100644
--- a/contrib/libvhost-user/libvhost-user.c
+++ b/contrib/libvhost-user/libvhost-user.c
@@ -920,6 +920,7 @@ static bool
vu_check_queue_msg_file(VuDev *dev, VhostUserMsg *vmsg)
{
int index = vmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
+ bool nofd = vmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK;
if (index >= dev->max_queues) {
vmsg_close_fds(vmsg);
@@ -927,8 +928,12 @@ vu_check_queue_msg_file(VuDev *dev, VhostUserMsg *vmsg)
return false;
}
- if (vmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK ||
- vmsg->fd_num != 1) {
+ if (nofd) {
+ vmsg_close_fds(vmsg);
+ return true;
+ }
+
+ if (vmsg->fd_num != 1) {
vmsg_close_fds(vmsg);
vu_panic(dev, "Invalid fds in request: %d", vmsg->request);
return false;
@@ -1025,6 +1030,7 @@ static bool
vu_set_vring_kick_exec(VuDev *dev, VhostUserMsg *vmsg)
{
int index = vmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
+ bool nofd = vmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK;
DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64);
@@ -1038,8 +1044,8 @@ vu_set_vring_kick_exec(VuDev *dev, VhostUserMsg *vmsg)
dev->vq[index].kick_fd = -1;
}
- dev->vq[index].kick_fd = vmsg->fds[0];
- DPRINT("Got kick_fd: %d for vq: %d\n", vmsg->fds[0], index);
+ dev->vq[index].kick_fd = nofd ? -1 : vmsg->fds[0];
+ DPRINT("Got kick_fd: %d for vq: %d\n", dev->vq[index].kick_fd, index);
dev->vq[index].started = true;
if (dev->iface->queue_set_started) {
@@ -1116,6 +1122,7 @@ static bool
vu_set_vring_call_exec(VuDev *dev, VhostUserMsg *vmsg)
{
int index = vmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
+ bool nofd = vmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK;
DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64);
@@ -1128,14 +1135,14 @@ vu_set_vring_call_exec(VuDev *dev, VhostUserMsg *vmsg)
dev->vq[index].call_fd = -1;
}
- dev->vq[index].call_fd = vmsg->fds[0];
+ dev->vq[index].call_fd = nofd ? -1 : vmsg->fds[0];
/* in case of I/O hang after reconnecting */
- if (eventfd_write(vmsg->fds[0], 1)) {
+ if (dev->vq[index].call_fd != -1 && eventfd_write(vmsg->fds[0], 1)) {
return -1;
}
- DPRINT("Got call_fd: %d for vq: %d\n", vmsg->fds[0], index);
+ DPRINT("Got call_fd: %d for vq: %d\n", dev->vq[index].call_fd, index);
return false;
}
@@ -1144,6 +1151,7 @@ static bool
vu_set_vring_err_exec(VuDev *dev, VhostUserMsg *vmsg)
{
int index = vmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
+ bool nofd = vmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK;
DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64);
@@ -1156,7 +1164,7 @@ vu_set_vring_err_exec(VuDev *dev, VhostUserMsg *vmsg)
dev->vq[index].err_fd = -1;
}
- dev->vq[index].err_fd = vmsg->fds[0];
+ dev->vq[index].err_fd = nofd ? -1 : vmsg->fds[0];
return false;
}
--
2.24.1
- [PATCH v5 0/6] small vhost changes and in-band notifications, Johannes Berg, 2020/01/23
- [PATCH v5 3/6] libvhost-user-glib: use g_main_context_get_thread_default(), Johannes Berg, 2020/01/23
- [PATCH v5 1/6] libvhost-user: implement VHOST_USER_PROTOCOL_F_REPLY_ACK, Johannes Berg, 2020/01/23
- [PATCH v5 4/6] libvhost-user: handle NOFD flag in call/kick/err better,
Johannes Berg <=
- [PATCH v5 6/6] libvhost-user: implement in-band notifications, Johannes Berg, 2020/01/23
- [PATCH v5 2/6] libvhost-user-glib: fix VugDev main fd cleanup, Johannes Berg, 2020/01/23
- [PATCH v5 5/6] docs: vhost-user: add in-band kick/call messages, Johannes Berg, 2020/01/23