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authorShannon Zhao <shannon.zhao@linaro.org>2015-09-11 11:30:22 +0800
committerMarc Zyngier <marc.zyngier@arm.com>2016-02-29 18:34:21 +0000
commit2aa36e9840d71710f06b3c29634f044fde8bcbe5 (patch)
treeaa646883c34800a0e363cbbb9d14df78407d3e59 /virt/kvm
parentb02386eb7dac7555a208d81aef2a0e5c6f0f8085 (diff)
downloadlinux-2aa36e9840d71710f06b3c29634f044fde8bcbe5.tar.gz
arm64: KVM: Reset PMU state when resetting vcpu
When resetting vcpu, it needs to reset the PMU state to initial status. Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org> Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Andrew Jones <drjones@redhat.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'virt/kvm')
-rw-r--r--virt/kvm/arm/pmu.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/virt/kvm/arm/pmu.c b/virt/kvm/arm/pmu.c
index 74e858c42ae1..1dbbc2c51559 100644
--- a/virt/kvm/arm/pmu.c
+++ b/virt/kvm/arm/pmu.c
@@ -84,6 +84,23 @@ static void kvm_pmu_stop_counter(struct kvm_vcpu *vcpu, struct kvm_pmc *pmc)
}
}
+/**
+ * kvm_pmu_vcpu_reset - reset pmu state for cpu
+ * @vcpu: The vcpu pointer
+ *
+ */
+void kvm_pmu_vcpu_reset(struct kvm_vcpu *vcpu)
+{
+ int i;
+ struct kvm_pmu *pmu = &vcpu->arch.pmu;
+
+ for (i = 0; i < ARMV8_PMU_MAX_COUNTERS; i++) {
+ kvm_pmu_stop_counter(vcpu, &pmu->pmc[i]);
+ pmu->pmc[i].idx = i;
+ pmu->pmc[i].bitmask = 0xffffffffUL;
+ }
+}
+
u64 kvm_pmu_valid_counter_mask(struct kvm_vcpu *vcpu)
{
u64 val = vcpu_sys_reg(vcpu, PMCR_EL0) >> ARMV8_PMU_PMCR_N_SHIFT;