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Re: [Qemu-devel] [PATCH v2 1/3] target-arm: kvm64: set guest PMUv3 featu
From: |
Andrew Jones |
Subject: |
Re: [Qemu-devel] [PATCH v2 1/3] target-arm: kvm64: set guest PMUv3 feature bit if supported |
Date: |
Sun, 24 Apr 2016 19:17:42 +0200 |
User-agent: |
Mutt/1.5.23.1 (2014-03-12) |
On Sat, Apr 23, 2016 at 06:04:13PM +0800, Shannon Zhao wrote:
> From: Shannon Zhao <address@hidden>
>
> Check if kvm supports guest PMUv3. If so, set the corresponding feature
> bit for vcpu.
>
> Signed-off-by: Shannon Zhao <address@hidden>
> ---
> target-arm/cpu-qom.h | 2 ++
> target-arm/kvm64.c | 5 +++++
> 2 files changed, 7 insertions(+)
Reviewed-by: Andrew Jones <address@hidden>
>
> diff --git a/target-arm/cpu-qom.h b/target-arm/cpu-qom.h
> index 1061c08..93aa6a4 100644
> --- a/target-arm/cpu-qom.h
> +++ b/target-arm/cpu-qom.h
> @@ -105,6 +105,8 @@ typedef struct ARMCPU {
> bool powered_off;
> /* CPU has security extension */
> bool has_el3;
> + /* CPU has PMU (Performance Monitor Unit) */
> + bool has_pmu;
>
> /* CPU has memory protection unit */
> bool has_mpu;
> diff --git a/target-arm/kvm64.c b/target-arm/kvm64.c
> index e8527bf..b364789 100644
> --- a/target-arm/kvm64.c
> +++ b/target-arm/kvm64.c
> @@ -461,6 +461,11 @@ int kvm_arch_init_vcpu(CPUState *cs)
> if (!arm_feature(&cpu->env, ARM_FEATURE_AARCH64)) {
> cpu->kvm_init_features[0] |= 1 << KVM_ARM_VCPU_EL1_32BIT;
> }
> + if (kvm_irqchip_in_kernel() &&
> + kvm_check_extension(cs->kvm_state, KVM_CAP_ARM_PMU_V3)) {
> + cpu->has_pmu = true;
> + cpu->kvm_init_features[0] |= 1 << KVM_ARM_VCPU_PMU_V3;
> + }
>
> /* Do KVM_ARM_VCPU_INIT ioctl */
> ret = kvm_arm_vcpu_init(cs);
> --
> 2.0.4
>
>