mirrors/qemu
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

multi-process: add proxy communication functions

Browse Source 
Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: d54edb4176361eed86b903e8f27058363b6c83b3.1611938319.git.jag.raman@oracle.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Elena Ufimtseva 2021-01-29 11:46:15 -05:00 committed by Stefan Hajnoczi
parent 9f8112073a
commit e7b2c9eaa2
2 changed files with 38 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
hw/remote/mpqemu-link.c
View File

@ -182,6 +182,40 @@ fail:
return ret;
}
/*
* Send msg and wait for a reply with command code RET_MSG.
* Returns the message received of size u64 or UINT64_MAX
* on error.
* Called from VCPU thread in non-coroutine context.
* Used by the Proxy object to communicate to remote processes.
*/
uint64_t mpqemu_msg_send_and_await_reply(MPQemuMsg *msg, PCIProxyDev *pdev,
Error **errp)
{
ERRP_GUARD();
MPQemuMsg msg_reply = {0};
uint64_t ret = UINT64_MAX;
assert(!qemu_in_coroutine());
QEMU_LOCK_GUARD(&pdev->io_mutex);
if (!mpqemu_msg_send(msg, pdev->ioc, errp)) {
return ret;
}
if (!mpqemu_msg_recv(&msg_reply, pdev->ioc, errp)) {
return ret;
}
if (!mpqemu_msg_valid(&msg_reply)) {
error_setg(errp, "ERROR: Invalid reply received for command %d",
msg->cmd);
return ret;
}
return msg_reply.data.u64;
}
bool mpqemu_msg_valid(MPQemuMsg *msg)
{
if (msg->cmd >= MPQEMU_CMD_MAX && msg->cmd < 0) {

4
include/hw/remote/mpqemu-link.h
View File

@ -15,6 +15,8 @@
#include "qemu/thread.h"
#include "io/channel.h"
#include "exec/hwaddr.h"
#include "io/channel-socket.h"
#include "hw/remote/proxy.h"
#define REMOTE_MAX_FDS 8
@ -68,6 +70,8 @@ typedef struct {
bool mpqemu_msg_send(MPQemuMsg *msg, QIOChannel *ioc, Error **errp);
bool mpqemu_msg_recv(MPQemuMsg *msg, QIOChannel *ioc, Error **errp);
uint64_t mpqemu_msg_send_and_await_reply(MPQemuMsg *msg, PCIProxyDev *pdev,
Error **errp);
bool mpqemu_msg_valid(MPQemuMsg *msg);
#endif