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dm: add io port 0xF4 writing to force DM exit

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This patch addes the debugexit function to DM. If it's enabled
by DM cmdline (by add --debugexit), the guest could write a
32bit value to port 0xF4 to trigger guest shutdown.

Tracked-on: #1465
Signed-off-by: Yin Fengwei <fengwei.yin@intel.com>
Reviewed-by: Jason Chen CJ <jason.cj.chen@intel.com>
Acked-by: Yu Wang <yu1.wang@intel.com>
This commit is contained in:
Yin Fengwei
2018-10-16 10:41:53 +08:00
committed by wenlingz
parent 9f7642648b
commit 75b03bef3b
4 changed files with 109 additions and 2 deletions
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80
devicemodel/hw/platform/debugexit.c Normal file
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/*-
* Copyright (c) 2018 Intel
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <assert.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "types.h"
#include "vmmapi.h"
#include "inout.h"
#include "mevent.h"
#define DEBUG_IO_BASE (0xf4)
#define DEBUG_IO_SIZE (1)
static int
debugexit_handler(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
uint32_t *eax, void *arg)
{
if (in)
*eax = 0xFFFF;
else {
vm_suspend(ctx, VM_SUSPEND_POWEROFF);
mevent_notify();
}
return 0;
}
void
init_debugexit(void)
{
struct inout_port iop;
memset(&iop, 0, sizeof(struct inout_port));
iop.name = "debugexit";
iop.port = DEBUG_IO_BASE;
iop.size = DEBUG_IO_SIZE;
iop.flags = IOPORT_F_INOUT;
iop.handler = debugexit_handler;
register_inout(&iop);
}
void
deinit_debugexit(void)
{
struct inout_port iop;
memset(&iop, 0, sizeof(struct inout_port));
iop.name = "debugexit";
iop.port = DEBUG_IO_BASE;
iop.size = DEBUG_IO_SIZE;
unregister_inout(&iop);
}