linux-kernel - [PATCH v9 04/12] perf/x86/intel/pt: add new capability for Intel PT

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Date:   Tue, 22 May 2018 12:52:07 +0800
From:   Luwei Kang <luwei.kang@...el.com>
To:     kvm@...r.kernel.org
Cc:     tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        x86@...nel.org, chao.p.peng@...ux.intel.com,
        thomas.lendacky@....com, bp@...e.de, Kan.liang@...el.com,
        Janakarajan.Natarajan@....com, dwmw@...zon.co.uk,
        linux-kernel@...r.kernel.org, alexander.shishkin@...ux.intel.com,
        peterz@...radead.org, mathieu.poirier@...aro.org,
        kstewart@...uxfoundation.org, gregkh@...uxfoundation.org,
        pbonzini@...hat.com, rkrcmar@...hat.com, david@...hat.com,
        bsd@...hat.com, yu.c.zhang@...ux.intel.com, joro@...tes.org,
        Luwei Kang <luwei.kang@...el.com>
Subject: [PATCH v9 04/12] perf/x86/intel/pt: add new capability for Intel PT

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@...el.com>
---
 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