int hvm_save(struct domain *d, hvm_domain_context_t *h)
{
char *c;
struct hvm_save_header hdr;
struct hvm_save_end end;
hvm_save_handler handler;
uint16_t i;
hdr.magic = HVM_FILE_MAGIC;
hdr.version = HVM_FILE_VERSION;
/* Save xen changeset */
c = strrchr(xen_changeset(), ':');
if ( c )
hdr.changeset = simple_strtoll(c, NULL, 16);
else
hdr.changeset = -1ULL; /* Unknown */
arch_hvm_save(d, &hdr);
if ( hvm_save_entry(HEADER, 0, h, &hdr) != 0 )
{
gdprintk(XENLOG_ERR, "HVM save: failed to write header\n");
return -EFAULT;
}
/* Save all available kinds of state */
for ( i = 0; i <= HVM_SAVE_CODE_MAX; i++ )
{
handler = hvm_sr_handlers[i].save;
if ( handler != NULL )
{
gdprintk(XENLOG_INFO, "HVM save: %s\n", hvm_sr_handlers[i].name);
if ( handler(d, h) != 0 )
{
gdprintk(XENLOG_ERR,
"HVM save: failed to save type %"PRIu16"\n", i);
return -EFAULT;
}
}
}
/* Save an end-of-file marker */
if ( hvm_save_entry(END, 0, h, &end) != 0 )
{
/* Run out of data */
gdprintk(XENLOG_ERR, "HVM save: no room for end marker.\n");
return -EFAULT;
}
/* Save macros should not have let us overrun */
ASSERT(h->cur <= h->size);
return 0;
}
/* Set up the single Xen-specific-info crash note. */
crash_xen_info_t *kexec_crash_save_info(void)
{
int cpu = smp_processor_id();
crash_xen_info_t info;
crash_xen_info_t *out = (crash_xen_info_t *)ELFNOTE_DESC(xen_crash_note);
BUG_ON(!cpu_test_and_set(cpu, crash_saved_cpus));
memset(&info, 0, sizeof(info));
info.xen_major_version = xen_major_version();
info.xen_minor_version = xen_minor_version();
info.xen_extra_version = __pa(xen_extra_version());
info.xen_changeset = __pa(xen_changeset());
info.xen_compiler = __pa(xen_compiler());
info.xen_compile_date = __pa(xen_compile_date());
info.xen_compile_time = __pa(xen_compile_time());
info.tainted = tainted;
/* Copy from guaranteed-aligned local copy to possibly-unaligned dest. */
memcpy(out, &info, sizeof(info));
return out;
}
int hvm_load(struct domain *d, hvm_domain_context_t *h)
{
char *c;
uint64_t cset;
struct hvm_save_header hdr;
struct hvm_save_descriptor *desc;
hvm_load_handler handler;
struct vcpu *v;
/* Read the save header, which must be first */
if ( hvm_load_entry(HEADER, h, &hdr) != 0 )
return -1;
if ( arch_hvm_load(d, &hdr) )
return -1;
c = strrchr(xen_changeset(), ':');
if ( hdr.changeset == -1ULL )
gdprintk(XENLOG_WARNING,
"HVM restore: Xen changeset was not saved.\n");
else if ( c == NULL )
gdprintk(XENLOG_WARNING,
"HVM restore: Xen changeset is not available.\n");
else
{
cset = simple_strtoll(c, NULL, 16);
if ( hdr.changeset != cset )
gdprintk(XENLOG_WARNING, "HVM restore: saved Xen changeset (%#"PRIx64
") does not match host (%#"PRIx64").\n", hdr.changeset, cset);
}
/* Down all the vcpus: we only re-enable the ones that had state saved. */
for_each_vcpu(d, v)
if ( test_and_set_bit(_VPF_down, &v->pause_flags) )
vcpu_sleep_nosync(v);
for ( ; ; )
{
if ( h->size - h->cur < sizeof(struct hvm_save_descriptor) )
{
/* Run out of data */
gdprintk(XENLOG_ERR,
"HVM restore: save did not end with a null entry\n");
return -1;
}
/* Read the typecode of the next entry and check for the end-marker */
desc = (struct hvm_save_descriptor *)(&h->data[h->cur]);
if ( desc->typecode == 0 )
return 0;
/* Find the handler for this entry */
if ( (desc->typecode > HVM_SAVE_CODE_MAX) ||
((handler = hvm_sr_handlers[desc->typecode].load) == NULL) )
{
gdprintk(XENLOG_ERR,
"HVM restore: unknown entry typecode %u\n",
desc->typecode);
return -1;
}
/* Load the entry */
gdprintk(XENLOG_INFO, "HVM restore: %s %"PRIu16"\n",
hvm_sr_handlers[desc->typecode].name, desc->instance);
if ( handler(d, h) != 0 )
{
gdprintk(XENLOG_ERR,
"HVM restore: failed to load entry %u/%u\n",
desc->typecode, desc->instance);
return -1;
}
}
/* Not reached */
}