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[PULL v3 20/27] multi-process: add proxy communication functions
From: |
Stefan Hajnoczi |
Subject: |
[PULL v3 20/27] multi-process: add proxy communication functions |
Date: |
Fri, 5 Feb 2021 16:44:52 +0000 |
From: Elena Ufimtseva <elena.ufimtseva@oracle.com>
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>
---
include/hw/remote/mpqemu-link.h | 4 ++++
hw/remote/mpqemu-link.c | 34 +++++++++++++++++++++++++++++++++
2 files changed, 38 insertions(+)
diff --git a/include/hw/remote/mpqemu-link.h b/include/hw/remote/mpqemu-link.h
index 6ee5bc5751..1b35d408f8 100644
--- a/include/hw/remote/mpqemu-link.h
+++ b/include/hw/remote/mpqemu-link.h
@@ -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
diff --git a/hw/remote/mpqemu-link.c b/hw/remote/mpqemu-link.c
index 4ee1128285..f5e9e01923 100644
--- a/hw/remote/mpqemu-link.c
+++ b/hw/remote/mpqemu-link.c
@@ -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) {
--
2.29.2
- Re: [PULL v3 11/27] multi-process: setup PCI host bridge for remote device, (continued)
- [PULL v3 12/27] multi-process: setup a machine object for remote device process, Stefan Hajnoczi, 2021/02/05
- [PULL v3 13/27] io: add qio_channel_writev_full_all helper, Stefan Hajnoczi, 2021/02/05
- [PULL v3 14/27] io: add qio_channel_readv_full_all_eof & qio_channel_readv_full_all helpers, Stefan Hajnoczi, 2021/02/05
- [PULL v3 15/27] multi-process: define MPQemuMsg format and transmission functions, Stefan Hajnoczi, 2021/02/05
- [PULL v3 17/27] multi-process: Associate fd of a PCIDevice with its object, Stefan Hajnoczi, 2021/02/05
- [PULL v3 16/27] multi-process: Initialize message handler in remote device, Stefan Hajnoczi, 2021/02/05
- [PULL v3 18/27] multi-process: setup memory manager for remote device, Stefan Hajnoczi, 2021/02/05
- [PULL v3 19/27] multi-process: introduce proxy object, Stefan Hajnoczi, 2021/02/05
- [PULL v3 20/27] multi-process: add proxy communication functions,
Stefan Hajnoczi <=
- [PULL v3 21/27] multi-process: Forward PCI config space acceses to the remote process, Stefan Hajnoczi, 2021/02/05
- [PULL v3 22/27] multi-process: PCI BAR read/write handling for proxy & remote endpoints, Stefan Hajnoczi, 2021/02/05
- [PULL v3 23/27] multi-process: Synchronize remote memory, Stefan Hajnoczi, 2021/02/05
- [PULL v3 24/27] multi-process: create IOHUB object to handle irq, Stefan Hajnoczi, 2021/02/05
- [PULL v3 25/27] multi-process: Retrieve PCI info from remote process, Stefan Hajnoczi, 2021/02/05
- [PULL v3 26/27] multi-process: perform device reset in the remote process, Stefan Hajnoczi, 2021/02/05
- [PULL v3 27/27] docs: fix Parallels Image "dirty bitmap" section, Stefan Hajnoczi, 2021/02/05
- Re: [PULL v3 00/27] Block patches, Peter Maydell, 2021/02/05