diff mbox series

[3/8] KVM: x86/mmu: Fix use of enums in trace_fast_page_fault

Message ID 20210611235701.3941724-4-dmatlack@google.com (mailing list archive)
State New, archived
Headers show
Series KVM: x86/mmu: Fast page fault support for the TDP MMU | expand

Commit Message

David Matlack June 11, 2021, 11:56 p.m. UTC 
Enum values have to be exported to userspace since the formatting is not
done in the kernel. Without doing this perf maps RET_PF_FIXED and
RET_PF_SPURIOUS to 0, which results in incorrect output:

  $ perf record -a -e kvmmmu:fast_page_fault --filter "ret==3" -- ./access_tracking_perf_test
  $ perf script | head -1
   [...] new 610006048d25877 spurious 0 fixed 0  <------ should be 1

Fix this by exporting the enum values to userspace with TRACE_DEFINE_ENUM.

Fixes: c4371c2a682e ("KVM: x86/mmu: Return unique RET_PF_* values if the fault was fixed")
Signed-off-by: David Matlack <dmatlack@google.com>
---
 arch/x86/kvm/mmu/mmutrace.h | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/arch/x86/kvm/mmu/mmutrace.h b/arch/x86/kvm/mmu/mmutrace.h
index e798489b56b5..669b1405c60d 100644
--- a/arch/x86/kvm/mmu/mmutrace.h
+++ b/arch/x86/kvm/mmu/mmutrace.h
@@ -244,6 +244,9 @@  TRACE_EVENT(
 		  __entry->access)
 );
 
+TRACE_DEFINE_ENUM(RET_PF_FIXED);
+TRACE_DEFINE_ENUM(RET_PF_SPURIOUS);
+
 TRACE_EVENT(
 	fast_page_fault,
 	TP_PROTO(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, u32 error_code,