Here is an update to the previously posted test program for HVM hypercalls.
Just replace the previous version of this file with this version.
Signed-off-by: Steve Ofsthun <sofsthun@xxxxxxxxxxxxxxx>
Steve
--
Steve Ofsthun - Virtual Iron Software, Inc.
/******************************************************************************
* hypercall.h
*
* Copyright (C) 2006, Virtual Iron Software, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
* Place - Suite 330, Boston, MA 02111-1307 USA.
*
*/
#include <linux/version.h>
#include <asm/hypervisor.h>
#include <xen/interface/xen.h>
static inline int
check_amd(void)
{
char id[12];
__asm__ __volatile__(
"cpuid"
: "=b" (*(int *)(&id[0])),
"=c" (*(int *)(&id[8])),
"=d" (*(int *)(&id[4]))
: "a" (0)
);
return __builtin_memcmp(id, "AuthenticAMD", 12) == 0;
}
#define VMCALL_INSTR 0x0f,0x01,0xc1
#define VMMCALL_INSTR 0x0f,0x01,0xd9
#define NR_hypercalls (PAGE_SIZE/32)
static inline void hypercall_page_init(void *hypercall_page)
{
int i;
char *p;
char vmcall[3] = { VMCALL_INSTR };
char vmmcall[3] = { VMMCALL_INSTR };
int amd = check_amd();
for ( i = 0; i < NR_hypercalls; i++ )
{
p = (char *)(hypercall_page + (i * 32));
/*
* This call sequence works for 32-bit and 64-bit guests.
*/
memset(p, 0xcc, 32);
*(u8 *)(p+ 0) = 0xb8; /* mov $<i>,%eax */
*(u32 *)(p+ 1) = i;
if (amd) {
*(u8 *)(p+ 5) = vmmcall[0];
*(u8 *)(p+ 6) = vmmcall[1];
*(u8 *)(p+ 7) = vmmcall[2];
} else {
*(u8 *)(p+ 5) = vmcall[0];
*(u8 *)(p+ 6) = vmcall[1];
*(u8 *)(p+ 7) = vmcall[2];
}
*(u8 *)(p+ 8) = 0xc3; /* ret */
}
}
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