KVM: x86/pmu: Force reprogramming of all counters on PMU filter change

Force vCPUs to reprogram all counters on a PMU filter change to provide
a sane ABI for userspace.  Use the existing KVM_REQ_PMU to do the
programming, and take advantage of the fact that the reprogram_pmi bitmap
fits in a u64 to set all bits in a single atomic update.  Note, setting
the bitmap and making the request needs to be done _after_ the SRCU
synchronization to ensure that vCPUs will reprogram using the new filter.

KVM's current "lazy" approach is confusing and non-deterministic.  It's
confusing because, from a developer perspective, the code is buggy as it
makes zero sense to let userspace modify the filter but then not actually
enforce the new filter.  The lazy approach is non-deterministic because
KVM enforces the filter whenever a counter is reprogrammed, not just on
guest WRMSRs, i.e. a guest might gain/lose access to an event at random
times depending on what is going on in the host.

Note, the resulting behavior is still non-determinstic while the filter
is in flux.  If userspace wants to guarantee deterministic behavior, all
vCPUs should be paused during the filter update.

Jim Mattson <jmattson@google.com>

Fixes: 66bb8a065f5a ("KVM: x86: PMU Event Filter")
Cc: Aaron Lewis <aaronlewis@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220923001355.3741194-2-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 9362b97..58a562b 100644 (file)
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -527,7 +527,16 @@ struct kvm_pmu {
        struct kvm_pmc gp_counters[KVM_INTEL_PMC_MAX_GENERIC];
        struct kvm_pmc fixed_counters[KVM_PMC_MAX_FIXED];
        struct irq_work irq_work;
-       DECLARE_BITMAP(reprogram_pmi, X86_PMC_IDX_MAX);
+
+       /*
+        * Overlay the bitmap with a 64-bit atomic so that all bits can be
+        * set in a single access, e.g. to reprogram all counters when the PMU
+        * filter changes.
+        */
+       union {
+               DECLARE_BITMAP(reprogram_pmi, X86_PMC_IDX_MAX);
+               atomic64_t __reprogram_pmi;
+       };
        DECLARE_BITMAP(all_valid_pmc_idx, X86_PMC_IDX_MAX);
        DECLARE_BITMAP(pmc_in_use, X86_PMC_IDX_MAX);
 

diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
index de1fd73..bf2c32e 100644 (file)
--- a/arch/x86/kvm/pmu.c
+++ b/arch/x86/kvm/pmu.c
@@ -577,6 +577,8 @@ EXPORT_SYMBOL_GPL(kvm_pmu_trigger_event);
 int kvm_vm_ioctl_set_pmu_event_filter(struct kvm *kvm, void __user *argp)
 {
        struct kvm_pmu_event_filter tmp, *filter;
+       struct kvm_vcpu *vcpu;
+       unsigned long i;
        size_t size;
        int r;
 
@@ -613,9 +615,18 @@ int kvm_vm_ioctl_set_pmu_event_filter(struct kvm *kvm, void __user *argp)
        mutex_lock(&kvm->lock);
        filter = rcu_replace_pointer(kvm->arch.pmu_event_filter, filter,
                                     mutex_is_locked(&kvm->lock));
+       synchronize_srcu_expedited(&kvm->srcu);
+
+       BUILD_BUG_ON(sizeof(((struct kvm_pmu *)0)->reprogram_pmi) >
+                    sizeof(((struct kvm_pmu *)0)->__reprogram_pmi));
+
+       kvm_for_each_vcpu(i, vcpu, kvm)
+               atomic64_set(&vcpu_to_pmu(vcpu)->__reprogram_pmi, -1ull);
+
+       kvm_make_all_cpus_request(kvm, KVM_REQ_PMU);
+
        mutex_unlock(&kvm->lock);
 
-       synchronize_srcu_expedited(&kvm->srcu);
        r = 0;
 cleanup:
        kfree(filter);