[PATCH v8 04/12] perf/x86/intel/pt: add new capability for Intel PT

[Luwei Kang]

CPUID(EAX=14H,ECX=0):EBX[bit 3] = 1 indicates support of
output to Trace Transport subsystem.
MSR IA32_RTIT_CTL.FabricEn[bit 6] is reserved if
CPUID.(EAX=14H, ECX=0):ECX[bit 3] = 0.
This is use for emulate IA32_RTIT_CTL MSR read/write
in KVM. KVM guest write IA32_RTIT_CTL will trap to
root mode and a #GP would be injected to guest if set
IA32_RTIT_CTL.FabricEn with
CPUID.(EAX=14H, ECX=0):ECX[bit 3] = 0.

Signed-off-by: Luwei Kang <luwei.kang@xxxxxxxxx>
---
 arch/x86/events/intel/pt.c      | 1 +
 arch/x86/include/asm/intel_pt.h | 1 +
 2 files changed, 2 insertions(+)

diff --git a/arch/x86/events/intel/pt.c b/arch/x86/events/intel/pt.c
index c80e2f5..f65f97a 100644
--- a/arch/x86/events/intel/pt.c
+++ b/arch/x86/events/intel/pt.c
@@ -68,6 +68,7 @@
 	PT_CAP(topa_output,		0, CPUID_ECX, BIT(0)),
 	PT_CAP(topa_multiple_entries,	0, CPUID_ECX, BIT(1)),
 	PT_CAP(single_range_output,	0, CPUID_ECX, BIT(2)),
+	PT_CAP(output_subsys,		0, CPUID_ECX, BIT(3)),
 	PT_CAP(payloads_lip,		0, CPUID_ECX, BIT(31)),
 	PT_CAP(num_address_ranges,	1, CPUID_EAX, 0x3),
 	PT_CAP(mtc_periods,		1, CPUID_EAX, 0xffff0000),
diff --git a/arch/x86/include/asm/intel_pt.h b/arch/x86/include/asm/intel_pt.h
index 4270421..2de4db0 100644
--- a/arch/x86/include/asm/intel_pt.h
+++ b/arch/x86/include/asm/intel_pt.h
@@ -16,6 +16,7 @@ enum pt_capabilities {
 	PT_CAP_topa_output,
 	PT_CAP_topa_multiple_entries,
 	PT_CAP_single_range_output,
+	PT_CAP_output_subsys,
 	PT_CAP_payloads_lip,
 	PT_CAP_num_address_ranges,
 	PT_CAP_mtc_periods,
-- 
1.8.3.1