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spapr: Add a "no HPT" encoding to HTAB migration stream 

Add a "no HPT" encoding (using value -1) to the HTAB migration
stream (in the place of HPT size) when the guest doesn't allocate HPT.
This will help the target side to match target HPT with the source HPT
and thus enable successful migration.

Suggested-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Bharata B Rao 2017-06-12 11:02:34 +05:30 committed by David Gibson
parent d5fc133eed
commit 3a38429748
1 changed files with 25 additions and 4 deletions
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29
hw/ppc/spapr.c
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@ -1560,13 +1560,19 @@ static int htab_save_setup(QEMUFile *f, void *opaque)
sPAPRMachineState *spapr = opaque;
/* "Iteration" header */
qemu_put_be32(f, spapr->htab_shift);
if (!spapr->htab_shift) {
qemu_put_be32(f, -1);
} else {
qemu_put_be32(f, spapr->htab_shift);
}
if (spapr->htab) {
spapr->htab_save_index = 0;
spapr->htab_first_pass = true;
} else {
assert(kvm_enabled());
if (spapr->htab_shift) {
assert(kvm_enabled());
}
}
@ -1712,7 +1718,12 @@ static int htab_save_iterate(QEMUFile *f, void *opaque)
int rc = 0;
/* Iteration header */
qemu_put_be32(f, 0);
if (!spapr->htab_shift) {
qemu_put_be32(f, -1);
return 0;
} else {
qemu_put_be32(f, 0);
}
if (!spapr->htab) {
assert(kvm_enabled());
@ -1746,7 +1757,12 @@ static int htab_save_complete(QEMUFile *f, void *opaque)
int fd;
/* Iteration header */
qemu_put_be32(f, 0);
if (!spapr->htab_shift) {
qemu_put_be32(f, -1);
return 0;
} else {
qemu_put_be32(f, 0);
}
if (!spapr->htab) {
int rc;
@ -1790,6 +1806,11 @@ static int htab_load(QEMUFile *f, void *opaque, int version_id)
section_hdr = qemu_get_be32(f);
if (section_hdr == -1) {
spapr_free_hpt(spapr);
return 0;
}
if (section_hdr) {
Error *local_err = NULL;