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multi-process: setup memory manager for remote device

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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.raman@oracle.com>
Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 7d2d1831d812e85f681e7a8ab99e032cf4704689.1611938319.git.jag.raman@oracle.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Jagannathan Raman 2021-01-29 11:46:13 -05:00 • committed by Stefan Hajnoczi
parent c7d80c7c1d
commit ed5d001916
6 changed files with 109 additions and 0 deletions
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19
include/hw/remote/memory.h Normal file
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@ -0,0 +1,19 @@
/*
* Memory manager for remote device
*
* Copyright © 2018, 2021 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 "hw/remote/mpqemu-link.h"
void remote_sysmem_reconfig(MPQemuMsg *msg, Error **errp);
#endif

10
include/hw/remote/mpqemu-link.h
View file

@ -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
@ -30,9 +31,16 @@
*
*/
typedef enum {
MPQEMU_CMD_SYNC_SYSMEM,
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
@ -43,12 +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];