diff options
| author | Eric Hankland <ehankland@google.com> | 2019-07-10 18:25:15 -0700 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2019-07-11 15:08:28 +0200 |
| commit | 66bb8a065f5aedd4551d8d3fbce582972f65c2e1 (patch) | |
| tree | e91f4895073a3f406a02037637d8ac27ee5c4d9b /arch/x86/kvm/pmu.h | |
| parent | cdc238eb72f6b94b6c33b98c07b9fc3ac5e57b18 (diff) | |
| download | lwn-66bb8a065f5aedd4551d8d3fbce582972f65c2e1.tar.gz lwn-66bb8a065f5aedd4551d8d3fbce582972f65c2e1.zip | |
KVM: x86: PMU Event Filter
Some events can provide a guest with information about other guests or the
host (e.g. L3 cache stats); providing the capability to restrict access
to a "safe" set of events would limit the potential for the PMU to be used
in any side channel attacks. This change introduces a new VM ioctl that
sets an event filter. If the guest attempts to program a counter for
any blacklisted or non-whitelisted event, the kernel counter won't be
created, so any RDPMC/RDMSR will show 0 instances of that event.
Signed-off-by: Eric Hankland <ehankland@google.com>
[Lots of changes. All remaining bugs are probably mine. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/pmu.h')
| -rw-r--r-- | arch/x86/kvm/pmu.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kvm/pmu.h b/arch/x86/kvm/pmu.h index 22dff661145a..58265f761c3b 100644 --- a/arch/x86/kvm/pmu.h +++ b/arch/x86/kvm/pmu.h @@ -118,6 +118,7 @@ void kvm_pmu_refresh(struct kvm_vcpu *vcpu); void kvm_pmu_reset(struct kvm_vcpu *vcpu); void kvm_pmu_init(struct kvm_vcpu *vcpu); void kvm_pmu_destroy(struct kvm_vcpu *vcpu); +int kvm_vm_ioctl_set_pmu_event_filter(struct kvm *kvm, void __user *argp); bool is_vmware_backdoor_pmc(u32 pmc_idx); |