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/*
* Communication channel between QEMU and remote device process
*
* 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 MPQEMU_LINK_H
#define MPQEMU_LINK_H
#include "qom/object.h"
#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
#define MPQEMU_MSG_HDR_SIZE offsetof(MPQemuMsg, data.u64)
/**
* MPQemuCmd:
*
* MPQemuCmd enum type to specify the command to be executed on the remote
* device.
*
* This uses a private protocol between QEMU and the remote process. vfio-user
* protocol would supersede this in the future.
*
*/
typedef enum {
MPQEMU_CMD_SYNC_SYSMEM,
MPQEMU_CMD_RET,
MPQEMU_CMD_PCI_CFGWRITE,
MPQEMU_CMD_PCI_CFGREAD,
MPQEMU_CMD_BAR_WRITE,
MPQEMU_CMD_BAR_READ,
MPQEMU_CMD_MAX,
} MPQemuCmd;
typedef struct {
hwaddr gpas[REMOTE_MAX_FDS];
uint64_t sizes[REMOTE_MAX_FDS];
off_t offsets[REMOTE_MAX_FDS];
} SyncSysmemMsg;
typedef struct {
uint32_t addr;
uint32_t val;
int len;
} PciConfDataMsg;
typedef struct {
hwaddr addr;
uint64_t val;
unsigned size;
bool memory;
} BarAccessMsg;
/**
* MPQemuMsg:
* @cmd: The remote command
* @size: Size of the data to be shared
* @data: Structured data
* @fds: File descriptors to be shared with remote device
*
* MPQemuMsg Format of the message sent to the remote device from QEMU.
*
*/
typedef struct {
int cmd;
size_t size;
union {
uint64_t u64;
PciConfDataMsg pci_conf_data;
SyncSysmemMsg sync_sysmem;
BarAccessMsg bar_access;
} data;
int fds[REMOTE_MAX_FDS];
int num_fds;
} MPQemuMsg;
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
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