diff options
Diffstat (limited to 'arch/x86/kvm/pmu.c')
| -rw-r--r-- | arch/x86/kvm/pmu.c | 15 |
1 files changed, 4 insertions, 11 deletions
diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c index e39741997893..132d149494d6 100644 --- a/arch/x86/kvm/pmu.c +++ b/arch/x86/kvm/pmu.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Kernel-based Virtual Machine -- Performance Monitoring Unit support * @@ -7,10 +8,6 @@ * Avi Kivity <avi@redhat.com> * Gleb Natapov <gleb@redhat.com> * Wei Huang <wei@redhat.com> - * - * This work is licensed under the terms of the GNU GPL, version 2. See - * the COPYING file in the top-level directory. - * */ #include <linux/types.h> @@ -283,7 +280,7 @@ int kvm_pmu_rdpmc(struct kvm_vcpu *vcpu, unsigned idx, u64 *data) bool fast_mode = idx & (1u << 31); struct kvm_pmu *pmu = vcpu_to_pmu(vcpu); struct kvm_pmc *pmc; - u64 ctr_val; + u64 mask = fast_mode ? ~0u : ~0ull; if (!pmu->version) return 1; @@ -291,15 +288,11 @@ int kvm_pmu_rdpmc(struct kvm_vcpu *vcpu, unsigned idx, u64 *data) if (is_vmware_backdoor_pmc(idx)) return kvm_pmu_rdpmc_vmware(vcpu, idx, data); - pmc = kvm_x86_ops->pmu_ops->msr_idx_to_pmc(vcpu, idx); + pmc = kvm_x86_ops->pmu_ops->msr_idx_to_pmc(vcpu, idx, &mask); if (!pmc) return 1; - ctr_val = pmc_read_counter(pmc); - if (fast_mode) - ctr_val = (u32)ctr_val; - - *data = ctr_val; + *data = pmc_read_counter(pmc) & mask; return 0; } |