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Subject[PATCH v1 10/11] KVM: x86/pmu: Introduce the mask value for fixed counter
Date
The mask value of fixed counter control register should be dynamic
adjust with the number of fixed counters. This patch introduce a
variable that include the reserved bits of fix counter control
register.

Signed-off-by: Luwei Kang <luwei.kang@intel.com>
---
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/kvm/vmx/pmu_intel.c | 7 ++++++-
2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 35d230e..6f82fb7 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -471,6 +471,7 @@ struct kvm_pmu {
unsigned nr_arch_fixed_counters;
unsigned available_event_types;
u64 fixed_ctr_ctrl;
+ u64 fixed_ctr_ctrl_mask;
u64 global_ctrl;
u64 global_status;
u64 global_ovf_ctrl;
diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
index 8161488..578b830 100644
--- a/arch/x86/kvm/vmx/pmu_intel.c
+++ b/arch/x86/kvm/vmx/pmu_intel.c
@@ -277,7 +277,7 @@ static int intel_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
case MSR_CORE_PERF_FIXED_CTR_CTRL:
if (pmu->fixed_ctr_ctrl == data)
return 0;
- if (!(data & 0xfffffffffffff444ull)) {
+ if (!(data & pmu->fixed_ctr_ctrl_mask)) {
reprogram_fixed_counters(pmu, data);
return 0;
}
@@ -346,9 +346,11 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
struct kvm_cpuid_entry2 *entry;
union cpuid10_eax eax;
union cpuid10_edx edx;
+ int i;

pmu->nr_arch_gp_counters = 0;
pmu->nr_arch_fixed_counters = 0;
+ pmu->fixed_ctr_ctrl_mask = 0;
pmu->counter_bitmask[KVM_PMC_GP] = 0;
pmu->counter_bitmask[KVM_PMC_FIXED] = 0;
pmu->version = 0;
@@ -383,6 +385,9 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
((u64)1 << edx.split.bit_width_fixed) - 1;
}

+ for (i = 0; i < pmu->nr_arch_fixed_counters; i++)
+ pmu->fixed_ctr_ctrl_mask |= (0xbull << (i * 4));
+ pmu->fixed_ctr_ctrl_mask = ~pmu->fixed_ctr_ctrl_mask;
pmu->global_ctrl = ((1ull << pmu->nr_arch_gp_counters) - 1) |
(((1ull << pmu->nr_arch_fixed_counters) - 1) << INTEL_PMC_IDX_FIXED);
pmu->global_ctrl_mask = ~pmu->global_ctrl;
--
1.8.3.1
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