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| author | Shannon Zhao <shannon.zhao@linaro.org> | 2015-09-08 15:03:26 +0800 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2016-02-29 18:34:20 +0000 |
| commit | 76d883c4e6401b98ea26d40c437ff62719a517ad (patch) | |
| tree | df3f11cb7289442406f7b184acbcbbc9255f472b /virt | |
| parent | 9db52c78cd43c7fe69992cb7d57cffa991b36ced (diff) | |
| download | linux-76d883c4e6401b98ea26d40c437ff62719a517ad.tar.gz linux-76d883c4e6401b98ea26d40c437ff62719a517ad.tar.bz2 linux-76d883c4e6401b98ea26d40c437ff62719a517ad.zip | |
arm64: KVM: Add access handler for PMOVSSET and PMOVSCLR register
Since the reset value of PMOVSSET and PMOVSCLR is UNKNOWN, use
reset_unknown for its reset handler. Add a handler to emulate writing
PMOVSSET or PMOVSCLR register.
When writing non-zero value to PMOVSSET, the counter and its interrupt
is enabled, kick this vcpu to sync PMU interrupt.
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/arm/pmu.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/virt/kvm/arm/pmu.c b/virt/kvm/arm/pmu.c index 591a11d1bd13..023286101fef 100644 --- a/virt/kvm/arm/pmu.c +++ b/virt/kvm/arm/pmu.c @@ -149,6 +149,37 @@ void kvm_pmu_disable_counter(struct kvm_vcpu *vcpu, u64 val) } } +static u64 kvm_pmu_overflow_status(struct kvm_vcpu *vcpu) +{ + u64 reg = 0; + + if ((vcpu_sys_reg(vcpu, PMCR_EL0) & ARMV8_PMU_PMCR_E)) + reg = vcpu_sys_reg(vcpu, PMOVSSET_EL0); + reg &= vcpu_sys_reg(vcpu, PMCNTENSET_EL0); + reg &= vcpu_sys_reg(vcpu, PMINTENSET_EL1); + reg &= kvm_pmu_valid_counter_mask(vcpu); + + return reg; +} + +/** + * kvm_pmu_overflow_set - set PMU overflow interrupt + * @vcpu: The vcpu pointer + * @val: the value guest writes to PMOVSSET register + */ +void kvm_pmu_overflow_set(struct kvm_vcpu *vcpu, u64 val) +{ + u64 reg; + + if (val == 0) + return; + + vcpu_sys_reg(vcpu, PMOVSSET_EL0) |= val; + reg = kvm_pmu_overflow_status(vcpu); + if (reg != 0) + kvm_vcpu_kick(vcpu); +} + static bool kvm_pmu_counter_is_enabled(struct kvm_vcpu *vcpu, u64 select_idx) { return (vcpu_sys_reg(vcpu, PMCR_EL0) & ARMV8_PMU_PMCR_E) && |