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qemu: validate: Prefer existing qemuCaps

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The validation callback always fetched a fresh copy of 'qemuCaps' to use
for validation which is wrong in cases when the VM is already running,
such as device hotplug. The newly-fetched qemuCaps may contain flags
which weren't originally in use when starting the VM e.g. on a libvirtd
upgrade.

Since the post-parse/validation machinery has a per-run 'parseOpaque'
field filled with qemuCaps of the actual process we can reuse the caps
in cases when we get them.

The code still fetches a fresh copy if parseOpaque doesn't have a
per-run copy to preserve existing functionality.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Peter Krempa 2020-12-08 14:27:59 +01:00
parent 19af0b6e93
commit 7e9d180100
1 changed files with 20 additions and 10 deletions
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30
src/qemu/qemu_validate.c
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@ -1067,16 +1067,21 @@ qemuValidateDomainDefPanic(const virDomainDef *def,
int
qemuValidateDomainDef(const virDomainDef *def,
void *opaque,
void *parseOpaque G_GNUC_UNUSED)
void *parseOpaque)
{
virQEMUDriverPtr driver = opaque;
g_autoptr(virQEMUDriverConfig) cfg = virQEMUDriverGetConfig(driver);
g_autoptr(virQEMUCaps) qemuCaps = NULL;
g_autoptr(virQEMUCaps) qemuCapsLocal = NULL;
virQEMUCapsPtr qemuCaps = parseOpaque;
size_t i;
if (!(qemuCaps = virQEMUCapsCacheLookup(driver->qemuCapsCache,
def->emulator)))
return -1;
if (!qemuCaps) {
if (!(qemuCapsLocal = virQEMUCapsCacheLookup(driver->qemuCapsCache,
def->emulator)))
return -1;
qemuCaps = qemuCapsLocal;
}
if (def->os.type != VIR_DOMAIN_OSTYPE_HVM) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
@ -4666,15 +4671,20 @@ int
qemuValidateDomainDeviceDef(const virDomainDeviceDef *dev,
const virDomainDef *def,
void *opaque,
void *parseOpaque G_GNUC_UNUSED)
void *parseOpaque)
{
int ret = 0;
virQEMUDriverPtr driver = opaque;
g_autoptr(virQEMUCaps) qemuCaps = NULL;
g_autoptr(virQEMUCaps) qemuCapsLocal = NULL;
virQEMUCapsPtr qemuCaps = parseOpaque;
if (!(qemuCaps = virQEMUCapsCacheLookup(driver->qemuCapsCache,
def->emulator)))
return -1;
if (!qemuCaps) {
if (!(qemuCapsLocal = virQEMUCapsCacheLookup(driver->qemuCapsCache,
def->emulator)))
return -1;
qemuCaps = qemuCapsLocal;
}
if ((ret = qemuValidateDomainDeviceDefAddress(dev, qemuCaps)) < 0)
return ret;