lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Message-Id: <20220302111334.12689-3-likexu@tencent.com> Date: Wed, 2 Mar 2022 19:13:24 +0800 From: Like Xu <like.xu.linux@...il.com> To: Paolo Bonzini <pbonzini@...hat.com> Cc: Jim Mattson <jmattson@...gle.com>, kvm@...r.kernel.org, Sean Christopherson <seanjc@...gle.com>, Wanpeng Li <wanpengli@...cent.com>, Vitaly Kuznetsov <vkuznets@...hat.com>, Joerg Roedel <joro@...tes.org>, linux-kernel@...r.kernel.org, Like Xu <likexu@...cent.com> Subject: [PATCH v2 02/12] KVM: x86/pmu: Extract check_pmu_event_filter() from the same semantics From: Like Xu <likexu@...cent.com> Checking the kvm->arch.pmu_event_filter policy in both gp and fixed code paths was somewhat redundant, so common parts can be extracted, which reduces code footprint and improves readability. Signed-off-by: Like Xu <likexu@...cent.com> Reviewed-by: Wanpeng Li <wanpengli@...cent.com> --- arch/x86/kvm/pmu.c | 61 +++++++++++++++++++++++++++------------------- 1 file changed, 36 insertions(+), 25 deletions(-) diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c index 3f09af678b2c..fda963161951 100644 --- a/arch/x86/kvm/pmu.c +++ b/arch/x86/kvm/pmu.c @@ -182,13 +182,43 @@ static int cmp_u64(const void *a, const void *b) return *(__u64 *)a - *(__u64 *)b; } +static bool check_pmu_event_filter(struct kvm_pmc *pmc) +{ + struct kvm_pmu_event_filter *filter; + struct kvm *kvm = pmc->vcpu->kvm; + bool allow_event = true; + __u64 key; + int idx; + + filter = srcu_dereference(kvm->arch.pmu_event_filter, &kvm->srcu); + if (!filter) + goto out; + + if (pmc_is_gp(pmc)) { + key = pmc->eventsel & AMD64_RAW_EVENT_MASK_NB; + if (bsearch(&key, filter->events, filter->nevents, + sizeof(__u64), cmp_u64)) + allow_event = filter->action == KVM_PMU_EVENT_ALLOW; + else + allow_event = filter->action == KVM_PMU_EVENT_DENY; + } else { + idx = pmc->idx - INTEL_PMC_IDX_FIXED; + if (filter->action == KVM_PMU_EVENT_DENY && + test_bit(idx, (ulong *)&filter->fixed_counter_bitmap)) + allow_event = false; + if (filter->action == KVM_PMU_EVENT_ALLOW && + !test_bit(idx, (ulong *)&filter->fixed_counter_bitmap)) + allow_event = false; + } + +out: + return allow_event; +} + void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel) { u64 config; u32 type = PERF_TYPE_RAW; - struct kvm *kvm = pmc->vcpu->kvm; - struct kvm_pmu_event_filter *filter; - bool allow_event = true; if (eventsel & ARCH_PERFMON_EVENTSEL_PIN_CONTROL) printk_once("kvm pmu: pin control bit is ignored\n"); @@ -200,17 +230,7 @@ void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel) if (!(eventsel & ARCH_PERFMON_EVENTSEL_ENABLE) || !pmc_is_enabled(pmc)) return; - filter = srcu_dereference(kvm->arch.pmu_event_filter, &kvm->srcu); - if (filter) { - __u64 key = eventsel & AMD64_RAW_EVENT_MASK_NB; - - if (bsearch(&key, filter->events, filter->nevents, - sizeof(__u64), cmp_u64)) - allow_event = filter->action == KVM_PMU_EVENT_ALLOW; - else - allow_event = filter->action == KVM_PMU_EVENT_DENY; - } - if (!allow_event) + if (!check_pmu_event_filter(pmc)) return; if (!(eventsel & (ARCH_PERFMON_EVENTSEL_EDGE | @@ -245,23 +265,14 @@ void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 ctrl, int idx) { unsigned en_field = ctrl & 0x3; bool pmi = ctrl & 0x8; - struct kvm_pmu_event_filter *filter; - struct kvm *kvm = pmc->vcpu->kvm; pmc_pause_counter(pmc); if (!en_field || !pmc_is_enabled(pmc)) return; - filter = srcu_dereference(kvm->arch.pmu_event_filter, &kvm->srcu); - if (filter) { - if (filter->action == KVM_PMU_EVENT_DENY && - test_bit(idx, (ulong *)&filter->fixed_counter_bitmap)) - return; - if (filter->action == KVM_PMU_EVENT_ALLOW && - !test_bit(idx, (ulong *)&filter->fixed_counter_bitmap)) - return; - } + if (!check_pmu_event_filter(pmc)) + return; if (pmc->current_config == (u64)ctrl && pmc_resume_counter(pmc)) return; -- 2.35.1
Powered by blists - more mailing lists