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authorEric Hankland <ehankland@google.com>2019-07-18 21:38:18 +0300
committerPaolo Bonzini <pbonzini@redhat.com>2019-07-20 10:00:48 +0300
commit30cd8604323dbaf20a80e797fe7057f5b02e394d (patch)
tree53a0ecd235eb3805293d3be074d72f9ecf57403f /Documentation
parent88dddc11a8d6b09201b4db9d255b3394d9bc9e57 (diff)
downloadlinux-30cd8604323dbaf20a80e797fe7057f5b02e394d.tar.xz
KVM: x86: Add fixed counters to PMU filter
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>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/virtual/kvm/api.txt15
1 files changed, 10 insertions, 5 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index 2cd6250b2896..e54a3f51ddc5 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -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