SyncSysMemMsg message format is defined. It is used to send
file descriptors of the RAM regions to remote device.
RAM on the remote device is configured with a set of file descriptors.
Old RAM regions are deleted and new regions, each with an fd, is
added to the RAM.
Signed-off-by: Jagannathan Raman <jag.ra...@oracle.com>
Signed-off-by: John G Johnson <john.g.john...@oracle.com>
Signed-off-by: Elena Ufimtseva <elena.ufimts...@oracle.com>
Reviewed-by: Stefan Hajnoczi <stefa...@redhat.com>
---
MAINTAINERS | 2 ++
hw/i386/meson.build | 1 +
hw/i386/remote-memory.c | 58 +++++++++++++++++++++++++++++++++++++++++
include/hw/i386/remote-memory.h | 19 ++++++++++++++
include/io/mpqemu-link.h | 13 +++++++++
io/mpqemu-link.c | 11 ++++++++
6 files changed, 104 insertions(+)
create mode 100644 hw/i386/remote-memory.c
create mode 100644 include/hw/i386/remote-memory.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 487ab13..4aa00ec 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3109,6 +3109,8 @@ F: include/io/mpqemu-link.h
F: hw/i386/remote-msg.c
F: include/hw/i386/remote-obj.h
F: hw/i386/remote-obj.c
+F: include/hw/i386/remote-memory.h
+F: hw/i386/remote-memory.c
Build and test automation
-------------------------
diff --git a/hw/i386/meson.build b/hw/i386/meson.build
index 9735f6b..b698b36 100644
--- a/hw/i386/meson.build
+++ b/hw/i386/meson.build
@@ -27,6 +27,7 @@ i386_ss.add(when: 'CONFIG_PC', if_true: files(
i386_ss.add(when: 'CONFIG_MPQEMU', if_true: files('remote.c'))
i386_ss.add(when: 'CONFIG_MPQEMU', if_true: files('remote-msg.c'))
i386_ss.add(when: 'CONFIG_MPQEMU', if_true: files('remote-obj.c'))
+i386_ss.add(when: 'CONFIG_MPQEMU', if_true: files('remote-memory.c'))
subdir('kvm')
subdir('xen')
diff --git a/hw/i386/remote-memory.c b/hw/i386/remote-memory.c
new file mode 100644
index 0000000..27bc8a7
--- /dev/null
+++ b/hw/i386/remote-memory.c
@@ -0,0 +1,58 @@
+/*
+ * Memory manager for remote device
+ *
+ * Copyright © 2018, 2020 Oracle and/or its affiliates.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "qemu-common.h"
+
+#include "hw/i386/remote-memory.h"
+#include "exec/address-spaces.h"
+#include "exec/ram_addr.h"
+#include "qapi/error.h"
+
+void remote_sysmem_reconfig(MPQemuMsg *msg, Error **errp)
+{
+ SyncSysmemMsg *sysmem_info = &msg->data.sync_sysmem;
+ MemoryRegion *sysmem, *subregion, *next;
+ static unsigned int suffix;
+ Error *local_err = NULL;
+ char *name;
+ int region;
+
+ sysmem = get_system_memory();
+
+ memory_region_transaction_begin();
+
+ QTAILQ_FOREACH_SAFE(subregion, &sysmem->subregions, subregions_link, next)
{
+ if (subregion->ram) {
+ memory_region_del_subregion(sysmem, subregion);
+ object_unparent(OBJECT(subregion));
+ }
+ }
+
+ for (region = 0; region < msg->num_fds; region++) {
+ subregion = g_new(MemoryRegion, 1);
+ name = g_strdup_printf("remote-mem-%u", suffix++);
+ memory_region_init_ram_from_fd(subregion, NULL,
+ name, sysmem_info->sizes[region],
+ RAM_SHARED, msg->fds[region],
+ sysmem_info->offsets[region],
+ &local_err);
+ g_free(name);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ break;
+ }
+
+ memory_region_add_subregion(sysmem, sysmem_info->gpas[region],
+ subregion);
+ }
+
+ memory_region_transaction_commit();
+}
diff --git a/include/hw/i386/remote-memory.h b/include/hw/i386/remote-memory.h
new file mode 100644
index 0000000..aab3e4d
--- /dev/null
+++ b/include/hw/i386/remote-memory.h
@@ -0,0 +1,19 @@
+/*
+ * Memory manager for remote device
+ *
+ * Copyright © 2018, 2020 Oracle and/or its affiliates.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#ifndef REMOTE_MEMORY_H
+#define REMOTE_MEMORY_H
+
+#include "exec/hwaddr.h"
+#include "io/mpqemu-link.h"
+
+void remote_sysmem_reconfig(MPQemuMsg *msg, Error **errp);
+
+#endif
diff --git a/include/io/mpqemu-link.h b/include/io/mpqemu-link.h
index 3505e06..e33181a 100644
--- a/include/io/mpqemu-link.h
+++ b/include/io/mpqemu-link.h
@@ -14,6 +14,7 @@
#include "qom/object.h"
#include "qemu/thread.h"
#include "io/channel.h"
+#include "exec/hwaddr.h"
#define REMOTE_MAX_FDS 8
@@ -24,12 +25,22 @@
*
* MPQemuCmd enum type to specify the command to be executed on the remote
* device.
+ *
+ * SYNC_SYSMEM Shares QEMU's RAM with remote device's RAM
*/
typedef enum {
MPQEMU_CMD_INIT,
+ SYNC_SYSMEM,
+ RET_MSG,
MPQEMU_CMD_MAX,
} MPQemuCmd;
+typedef struct {
+ hwaddr gpas[REMOTE_MAX_FDS];
+ uint64_t sizes[REMOTE_MAX_FDS];
+ off_t offsets[REMOTE_MAX_FDS];
+} SyncSysmemMsg;
+
/**
* MPQemuMsg:
* @cmd: The remote command
@@ -40,12 +51,14 @@ typedef enum {
* MPQemuMsg Format of the message sent to the remote device from QEMU.
*
*/
+
typedef struct {
int cmd;
size_t size;
union {
uint64_t u64;
+ SyncSysmemMsg sync_sysmem;
} data;
int fds[REMOTE_MAX_FDS];
diff --git a/io/mpqemu-link.c b/io/mpqemu-link.c
index d646aad..b30e27c 100644
--- a/io/mpqemu-link.c
+++ b/io/mpqemu-link.c
@@ -233,5 +233,16 @@ bool mpqemu_msg_valid(MPQemuMsg *msg)
}
}
+ /* Verify message specific fields. */
+ switch (msg->cmd) {
+ case SYNC_SYSMEM:
+ if (msg->num_fds == 0 || msg->size != sizeof(SyncSysmemMsg)) {
+ return false;
+ }
+ break;
+ default:
+ break;
+ }
+
return true;
}
--
1.8.3.1
