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KVM: x86: Add fixed counters to PMU filter

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Updates KVM_CAP_PMU_EVENT_FILTER so it can also whitelist or blacklist
fixed counters.

Signed-off-by: Eric Hankland <ehankland@google.com>
[No need to check padding fields for zero. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Eric Hankland
2019-07-18 11:38:18 -07:00
committed by Paolo Bonzini
parent 88dddc11a8
commit 30cd860432
3 changed files with 35 additions and 12 deletions
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15
Documentation/virtual/kvm/api.txt
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@@ -4090,17 +4090,22 @@ Parameters: struct kvm_pmu_event_filter (in)
Returns: 0 on success, -1 on error
struct kvm_pmu_event_filter {
__u32 action;
__u32 nevents;
__u64 events[0];
__u32 action;
__u32 nevents;
__u32 fixed_counter_bitmap;
__u32 flags;
__u32 pad[4];
__u64 events[0];
};
This ioctl restricts the set of PMU events that the guest can program.
The argument holds a list of events which will be allowed or denied.
The eventsel+umask of each event the guest attempts to program is compared
against the events field to determine whether the guest should have access.
This only affects general purpose counters; fixed purpose counters can
be disabled by changing the perfmon CPUID leaf.
The events field only controls general purpose counters; fixed purpose
counters are controlled by the fixed_counter_bitmap.
No flags are defined yet, the field must be zero.
Valid values for 'action':
#define KVM_PMU_EVENT_ALLOW 0