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s390/stattrib: Add Error** argument to set_migrationmode() handler

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This will prepare ground for future changes adding an Error** argument
to the save_setup() handler. We need to make sure that on failure,
set_migrationmode() always sets a new error. See the Rules section in
qapi/error.h.

Cc: Halil Pasic <pasic@linux.ibm.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Thomas Huth <thuth@redhat.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/r/20240320064911.545001-2-clg@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
This commit is contained in:
Cédric Le Goater 2024-03-20 07:48:57 +01:00 committed by Peter Xu
parent fe3ba17b33
commit e86f243487
3 changed files with 21 additions and 8 deletions
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12
hw/s390x/s390-stattrib-kvm.c
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@ -17,6 +17,7 @@
#include "sysemu/kvm.h"
#include "exec/ram_addr.h"
#include "kvm/kvm_s390x.h"
#include "qapi/error.h"
Object *kvm_s390_stattrib_create(void)
{
@ -137,14 +138,21 @@ static void kvm_s390_stattrib_synchronize(S390StAttribState *sa)
}
}
static int kvm_s390_stattrib_set_migrationmode(S390StAttribState *sa, bool val)
static int kvm_s390_stattrib_set_migrationmode(S390StAttribState *sa, bool val,
Error **errp)
{
struct kvm_device_attr attr = {
.group = KVM_S390_VM_MIGRATION,
.attr = val,
.addr = 0,
};
return kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attr);
int r;
r = kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attr);
if (r) {
error_setg_errno(errp, -r, "setting KVM_S390_VM_MIGRATION failed");
}
return r;
}
static long long kvm_s390_stattrib_get_dirtycount(S390StAttribState *sa)

15
hw/s390x/s390-stattrib.c
View File

@ -60,11 +60,13 @@ void hmp_migrationmode(Monitor *mon, const QDict *qdict)
S390StAttribState *sas = s390_get_stattrib_device();
S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
uint64_t what = qdict_get_int(qdict, "mode");
Error *local_err = NULL;
int r;
r = sac->set_migrationmode(sas, what);
r = sac->set_migrationmode(sas, what, &local_err);
if (r < 0) {
monitor_printf(mon, "Error: %s", strerror(-r));
monitor_printf(mon, "Error: %s", error_get_pretty(local_err));
error_free(local_err);
}
}
@ -170,13 +172,15 @@ static int cmma_save_setup(QEMUFile *f, void *opaque)
{
S390StAttribState *sas = S390_STATTRIB(opaque);
S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
Error *local_err = NULL;
int res;
/*
* Signal that we want to start a migration, thus needing PGSTE dirty
* tracking.
*/
res = sac->set_migrationmode(sas, 1);
res = sac->set_migrationmode(sas, true, &local_err);
if (res) {
error_report_err(local_err);
return res;
}
qemu_put_be64(f, STATTR_FLAG_EOS);
@ -260,7 +264,7 @@ static void cmma_save_cleanup(void *opaque)
{
S390StAttribState *sas = S390_STATTRIB(opaque);
S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
sac->set_migrationmode(sas, 0);
sac->set_migrationmode(sas, false, NULL);
}
static bool cmma_active(void *opaque)
@ -293,7 +297,8 @@ static long long qemu_s390_get_dirtycount_stub(S390StAttribState *sa)
{
return 0;
}
static int qemu_s390_set_migrationmode_stub(S390StAttribState *sa, bool value)
static int qemu_s390_set_migrationmode_stub(S390StAttribState *sa, bool value,
Error **errp)
{
return 0;
}

2
include/hw/s390x/storage-attributes.h
View File

@ -39,7 +39,7 @@ struct S390StAttribClass {
int (*set_stattr)(S390StAttribState *sa, uint64_t start_gfn,
uint32_t count, uint8_t *values);
void (*synchronize)(S390StAttribState *sa);
int (*set_migrationmode)(S390StAttribState *sa, bool value);
int (*set_migrationmode)(S390StAttribState *sa, bool value, Error **errp);
int (*get_active)(S390StAttribState *sa);
long long (*get_dirtycount)(S390StAttribState *sa);
};