CPU vPMU is now turned off by default, but it was ON in virt-2.7
machine type. To solve this problem, this patch adds a PMU option
in machine state, which is used to control CPU's vPMU status. This
PMU option is not exposed to command line and is turned on in
virt-2.7 machine type to make sure it is backward compatible.
Signed-off-by: Wei Huang <w...@redhat.com>
---
hw/arm/virt.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index a781ad0..b25351c 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -84,6 +84,7 @@ typedef struct {
MachineClass parent;
VirtBoardInfo *daughterboard;
bool disallow_affinity_adjustment;
+ bool pmu_default_on;
} VirtMachineClass;
typedef struct {
@@ -1287,6 +1288,8 @@ static void machvirt_init(MachineState *machine)
for (n = 0; n < smp_cpus; n++) {
Object *cpuobj = object_new(typename);
+ ARMCPU *cpu = ARM_CPU(cpuobj);
+
if (!vmc->disallow_affinity_adjustment) {
/* Adjust MPIDR like 64-bit KVM hosts, which incorporate the
* GIC's target-list limitations. 32-bit KVM hosts currently
@@ -1317,6 +1320,12 @@ static void machvirt_init(MachineState *machine)
}
}
+ if (cpu->has_pmu == ON_OFF_AUTO_AUTO &&
+ object_property_find(cpuobj, "pmu", NULL)) {
+ cpu->has_pmu = vmc->pmu_default_on ? ON_OFF_AUTO_ON :
+ ON_OFF_AUTO_OFF;
+ }
+
if (object_property_find(cpuobj, "reset-cbar", NULL)) {
object_property_set_int(cpuobj, vbi->memmap[VIRT_CPUPERIPHS].base,
"reset-cbar", &error_abort);
@@ -1514,6 +1523,9 @@ static void virt_2_7_instance_init(Object *obj)
static void virt_machine_2_7_options(MachineClass *mc)
{
+ VirtMachineClass *vmc = VIRT_MACHINE_CLASS(OBJECT_CLASS(mc));
+
+ vmc->pmu_default_on = true;
}
DEFINE_VIRT_MACHINE_AS_LATEST(2, 7)
@@ -1532,5 +1544,9 @@ static void virt_machine_2_6_options(MachineClass *mc)
virt_machine_2_7_options(mc);
SET_MACHINE_COMPAT(mc, VIRT_COMPAT_2_6);
vmc->disallow_affinity_adjustment = true;
+ /* Disable PMU for 2.6 and down as PMU support was first introduced
+ * and enabled in 2.7.
+ */
+ vmc->pmu_default_on = false;
}
DEFINE_VIRT_MACHINE(2, 6)
--
1.8.3.1
