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[PATCH v15 14/20] multi-process: add proxy communication functions
From: |
elena . ufimtseva |
Subject: |
[PATCH v15 14/20] multi-process: add proxy communication functions |
Date: |
Tue, 22 Dec 2020 22:14:49 -0800 |
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>
---
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 48c617ebad..36b540c047 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 5c9af1de71..df35a4d9c6 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) {
--
2.25.GIT
- [PATCH v15 00/20] Initial support for multi-process Qemu, elena . ufimtseva, 2020/12/23
- [PATCH v15 05/20] multi-process: setup PCI host bridge for remote device, elena . ufimtseva, 2020/12/23
- [PATCH v15 02/20] multi-process: add configure and usage information, elena . ufimtseva, 2020/12/23
- [PATCH v15 15/20] multi-process: Forward PCI config space acceses to the remote process, elena . ufimtseva, 2020/12/23
- [PATCH v15 11/20] multi-process: Associate fd of a PCIDevice with its object, elena . ufimtseva, 2020/12/23
- [PATCH v15 01/20] multi-process: add the concept description to docs/devel/qemu-multiprocess, elena . ufimtseva, 2020/12/23
- [PATCH v15 14/20] multi-process: add proxy communication functions,
elena . ufimtseva <=
- [PATCH v15 13/20] multi-process: introduce proxy object, elena . ufimtseva, 2020/12/23
- [PATCH v15 10/20] multi-process: Initialize message handler in remote device, elena . ufimtseva, 2020/12/23
- [PATCH v15 12/20] multi-process: setup memory manager for remote device, elena . ufimtseva, 2020/12/23
- [PATCH v15 04/20] multi-process: Add config option for multi-process QEMU, elena . ufimtseva, 2020/12/23
- [PATCH v15 09/20] multi-process: define MPQemuMsg format and transmission functions, elena . ufimtseva, 2020/12/23
- [PATCH v15 20/20] multi-process: perform device reset in the remote process, elena . ufimtseva, 2020/12/23
- [PATCH v15 03/20] memory: alloc RAM from file at offset, elena . ufimtseva, 2020/12/23
- [PATCH v15 06/20] multi-process: setup a machine object for remote device process, elena . ufimtseva, 2020/12/23
- [PATCH v15 07/20] multi-process: add qio channel write function, elena . ufimtseva, 2020/12/23
- [PATCH v15 16/20] multi-process: PCI BAR read/write handling for proxy & remote endpoints, elena . ufimtseva, 2020/12/23