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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>
73 lines
1.5 KiB
C
73 lines
1.5 KiB
C
/*
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* Communication channel between QEMU and remote device process
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*
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* Copyright © 2018, 2021 Oracle and/or its affiliates.
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#ifndef MPQEMU_LINK_H
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#define MPQEMU_LINK_H
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#include "qom/object.h"
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#include "qemu/thread.h"
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#include "io/channel.h"
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#include "exec/hwaddr.h"
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#define REMOTE_MAX_FDS 8
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#define MPQEMU_MSG_HDR_SIZE offsetof(MPQemuMsg, data.u64)
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/**
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* MPQemuCmd:
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*
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* MPQemuCmd enum type to specify the command to be executed on the remote
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* device.
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*
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* This uses a private protocol between QEMU and the remote process. vfio-user
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* protocol would supersede this in the future.
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*
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*/
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typedef enum {
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MPQEMU_CMD_SYNC_SYSMEM,
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MPQEMU_CMD_MAX,
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} MPQemuCmd;
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typedef struct {
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hwaddr gpas[REMOTE_MAX_FDS];
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uint64_t sizes[REMOTE_MAX_FDS];
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off_t offsets[REMOTE_MAX_FDS];
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} SyncSysmemMsg;
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/**
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* MPQemuMsg:
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* @cmd: The remote command
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* @size: Size of the data to be shared
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* @data: Structured data
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* @fds: File descriptors to be shared with remote device
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*
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* MPQemuMsg Format of the message sent to the remote device from QEMU.
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*
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*/
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typedef struct {
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int cmd;
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size_t size;
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union {
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uint64_t u64;
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SyncSysmemMsg sync_sysmem;
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} data;
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int fds[REMOTE_MAX_FDS];
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int num_fds;
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} MPQemuMsg;
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bool mpqemu_msg_send(MPQemuMsg *msg, QIOChannel *ioc, Error **errp);
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bool mpqemu_msg_recv(MPQemuMsg *msg, QIOChannel *ioc, Error **errp);
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bool mpqemu_msg_valid(MPQemuMsg *msg);
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#endif
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