diff options
| author | Wei Huang <wei@redhat.com> | 2016-10-28 14:12:31 +0100 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2016-10-28 15:51:27 +0100 |
| commit | 929e754d5a621cd53f30e69b766ccf381b58d124 (patch) | |
| tree | c45dfc88a52151503499de05df746d39e7c3d99b /target-arm/cpu.c | |
| parent | d1df5cf3634af7003951d23164f349e360ecb601 (diff) | |
arm: Add an option to turn on/off vPMU support
This patch adds a pmu=[on/off] option to enable/disable vPMU support
in guest vCPU. It allows virt tools, such as libvirt, to determine the
exsitence of vPMU and configure it. Note this option is only available
for cortex-a57/cortex-53/ host CPUs, but unavailable on ARMv7 and other
processors. Also even though "pmu=" option is available for TCG mode,
setting it doesn't turn PMU on.
Signed-off-by: Wei Huang <wei@redhat.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Message-id: 1477463301-17175-2-git-send-email-wei@redhat.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'target-arm/cpu.c')
| -rw-r--r-- | target-arm/cpu.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/target-arm/cpu.c b/target-arm/cpu.c index 2439ca57d0..99f0dbebb9 100644 --- a/target-arm/cpu.c +++ b/target-arm/cpu.c @@ -19,6 +19,7 @@ */ #include "qemu/osdep.h" +#include "qemu/error-report.h" #include "qapi/error.h" #include "cpu.h" #include "internals.h" @@ -496,6 +497,10 @@ static Property arm_cpu_rvbar_property = static Property arm_cpu_has_el3_property = DEFINE_PROP_BOOL("has_el3", ARMCPU, has_el3, true); +/* use property name "pmu" to match other archs and virt tools */ +static Property arm_cpu_has_pmu_property = + DEFINE_PROP_BOOL("pmu", ARMCPU, has_pmu, true); + static Property arm_cpu_has_mpu_property = DEFINE_PROP_BOOL("has-mpu", ARMCPU, has_mpu, true); @@ -539,6 +544,11 @@ static void arm_cpu_post_init(Object *obj) #endif } + if (arm_feature(&cpu->env, ARM_FEATURE_PMU)) { + qdev_property_add_static(DEVICE(obj), &arm_cpu_has_pmu_property, + &error_abort); + } + if (arm_feature(&cpu->env, ARM_FEATURE_MPU)) { qdev_property_add_static(DEVICE(obj), &arm_cpu_has_mpu_property, &error_abort); @@ -677,6 +687,11 @@ static void arm_cpu_realizefn(DeviceState *dev, Error **errp) cpu->id_aa64pfr0 &= ~0xf000; } + if (!cpu->has_pmu || !kvm_enabled()) { + cpu->has_pmu = false; + unset_feature(env, ARM_FEATURE_PMU); + } + if (!arm_feature(env, ARM_FEATURE_EL2)) { /* Disable the hypervisor feature bits in the processor feature * registers if we don't have EL2. These are id_pfr1[15:12] and |