In order to not affect running VMs, refreshing the halted state
is only performed if QEMU supports the query-cpus-fast QAPI.
Signed-off-by: Viktor Mihajlovski <mihaj...@linux.vnet.ibm.com>
Reviewed-by: Boris Fiuczynski <fiu...@linux.vnet.ibm.com>
Reviewed-by: Marc Hartmayer <mhart...@linux.vnet.ibm.com>
---
src/qemu/qemu_domain.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 662937b..0331af7 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -9124,8 +9124,13 @@ qemuDomainRefreshVcpuHalted(virQEMUDriverPtr driver,
return 0;
/* The halted state is interresting only on s390(x). On other platforms
- * the data would be stale at the time when it would be used. */
- if (!ARCH_IS_S390(vm->def->os.arch))
+ * the data would be stale at the time when it would be used.
+ * Calling qemuMonitorGetCpuHalted() can adversely affect the running
+ * VM's performance unless QEMU supports query-cpus-fast.
+ */
+ if (!ARCH_IS_S390(vm->def->os.arch) ||
+ !virQEMUCapsGet(QEMU_DOMAIN_PRIVATE(vm)->qemuCaps,
+ QEMU_CAPS_QUERY_CPUS_FAST))
return 0;
if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0)
--
1.9.1
--
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