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/*
* hvm/save.c: Save and restore HVM guest's emulated hardware state.
*
* Copyright (c) 2004, Intel Corporation.
* Copyright (c) 2007, XenSource Inc.
* Copyright (c) 2007, Isaku Yamahata <yamahata at valinux co jp>
* VA Linux Systems Japan K.K.
* split x86 specific part
*
* 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 <asm/hvm/support.h>
#include <public/hvm/save.h>
void arch_hvm_save(struct domain *d, struct hvm_save_header *hdr)
{
uint32_t eax, ebx, ecx, edx;
/* Save some CPUID bits */
cpuid(1, &eax, &ebx, &ecx, &edx);
hdr->cpuid = eax;
/* Save guest's preferred TSC. */
hdr->gtsc_khz = d->arch.tsc_khz;
}
int arch_hvm_load(struct domain *d, struct hvm_save_header *hdr)
{
uint32_t eax, ebx, ecx, edx;
if ( hdr->magic != HVM_FILE_MAGIC )
{
printk(XENLOG_G_ERR "HVM%d restore: bad magic number %#"PRIx32"\n",
d->domain_id, hdr->magic);
return -1;
}
if ( hdr->version != HVM_FILE_VERSION )
{
printk(XENLOG_G_ERR "HVM%d restore: unsupported version %u\n",
d->domain_id, hdr->version);
return -1;
}
cpuid(1, &eax, &ebx, &ecx, &edx);
/* CPUs ought to match but with feature-masking they might not */
if ( (hdr->cpuid & ~0x0fUL) != (eax & ~0x0fUL) )
printk(XENLOG_G_INFO "HVM%d restore: VM saved on one CPU "
"(%#"PRIx32") and restored on another (%#"PRIx32").\n",
d->domain_id, hdr->cpuid, eax);
/* Restore guest's preferred TSC frequency. */
if ( hdr->gtsc_khz )
d->arch.tsc_khz = hdr->gtsc_khz;
if ( d->arch.vtsc )
hvm_set_rdtsc_exiting(d, 1);
/* VGA state is not saved/restored, so we nobble the cache. */
d->arch.hvm_domain.stdvga.cache = 0;
return 0;
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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