From: Greg Kurz <gr...@kaod.org>
spapr_reallocate_hpt() has three users, two of which pass &error_fatal
and the third one, htab_load(), passes &local_err, uses it to detect
failures and simply propagates -EINVAL up to vmstate_load(), which will
cause QEMU to exit. It is thus confusing that spapr_reallocate_hpt()
doesn't return right away when an error is detected in some cases. Also,
the comment suggesting that the caller is welcome to try to carry on
seems like a remnant in this respect.
This can be improved:
- change spapr_reallocate_hpt() to always report a negative errno on
failure, either as reported by KVM or -ENOSPC if the HPT is smaller
than what was asked,
- use that to detect failures in htab_load() which is preferred over
checking &local_err,
- propagate this negative errno to vmstate_load() because it is more
accurate than propagating -EINVAL for all possible errors.
[dwg: Fix compile error due to omitted prelim patch]
Signed-off-by: Greg Kurz <gr...@kaod.org>
Message-Id: <160371605460.305923.5890143959901241157.st...@bahia.lan>
Signed-off-by: David Gibson <da...@gibson.dropbear.id.au>
---
hw/ppc/spapr.c | 20 +++++++++++---------
include/hw/ppc/spapr.h | 3 +--
2 files changed, 12 insertions(+), 11 deletions(-)
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index ec2536dba1..227075103e 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -1483,8 +1483,7 @@ void spapr_free_hpt(SpaprMachineState *spapr)
close_htab_fd(spapr);
}
-void spapr_reallocate_hpt(SpaprMachineState *spapr, int shift,
- Error **errp)
+int spapr_reallocate_hpt(SpaprMachineState *spapr, int shift, Error **errp)
{
ERRP_GUARD();
long rc;
@@ -1496,7 +1495,7 @@ void spapr_reallocate_hpt(SpaprMachineState *spapr, int
shift,
if (rc == -EOPNOTSUPP) {
error_setg(errp, "HPT not supported in nested guests");
- return;
+ return -EOPNOTSUPP;
}
if (rc < 0) {
@@ -1504,8 +1503,7 @@ void spapr_reallocate_hpt(SpaprMachineState *spapr, int
shift,
error_setg_errno(errp, errno, "Failed to allocate KVM HPT of order %d",
shift);
error_append_hint(errp, "Try smaller maxmem?\n");
- /* This is almost certainly fatal, but if the caller really
- * wants to carry on with shift == 0, it's welcome to try */
+ return -errno;
} else if (rc > 0) {
/* kernel-side HPT allocated */
if (rc != shift) {
@@ -1513,6 +1511,7 @@ void spapr_reallocate_hpt(SpaprMachineState *spapr, int
shift,
"Requested order %d HPT, but kernel allocated order
%ld",
shift, rc);
error_append_hint(errp, "Try smaller maxmem?\n");
+ return -ENOSPC;
}
spapr->htab_shift = shift;
@@ -1526,7 +1525,7 @@ void spapr_reallocate_hpt(SpaprMachineState *spapr, int
shift,
if (!spapr->htab) {
error_setg_errno(errp, errno,
"Could not allocate HPT of order %d", shift);
- return;
+ return -ENOMEM;
}
memset(spapr->htab, 0, size);
@@ -1539,6 +1538,7 @@ void spapr_reallocate_hpt(SpaprMachineState *spapr, int
shift,
/* We're setting up a hash table, so that means we're not radix */
spapr->patb_entry = 0;
spapr_set_all_lpcrs(0, LPCR_HR | LPCR_UPRT);
+ return 0;
}
void spapr_setup_hpt(SpaprMachineState *spapr)
@@ -2292,11 +2292,13 @@ static int htab_load(QEMUFile *f, void *opaque, int
version_id)
}
if (section_hdr) {
+ int ret;
+
/* First section gives the htab size */
- spapr_reallocate_hpt(spapr, section_hdr, &local_err);
- if (local_err) {
+ ret = spapr_reallocate_hpt(spapr, section_hdr, &local_err);
+ if (ret < 0) {
error_report_err(local_err);
- return -EINVAL;
+ return ret;
}
return 0;
}
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index bb47896f17..2e89e36cfb 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -846,8 +846,7 @@ void spapr_hotplug_req_add_by_count_indexed(SpaprDrcType
drc_type,
void spapr_hotplug_req_remove_by_count_indexed(SpaprDrcType drc_type,
uint32_t count, uint32_t index);
int spapr_hpt_shift_for_ramsize(uint64_t ramsize);
-void spapr_reallocate_hpt(SpaprMachineState *spapr, int shift,
- Error **errp);
+int spapr_reallocate_hpt(SpaprMachineState *spapr, int shift, Error **errp);
void spapr_clear_pending_events(SpaprMachineState *spapr);
void spapr_clear_pending_hotplug_events(SpaprMachineState *spapr);
int spapr_max_server_number(SpaprMachineState *spapr);
--
2.26.2
