linux-kernel - [PATCH v2 3/6] x86/cpu: Expose CPUID regs, leaf and index definitions to tools

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Date:   Wed, 28 Apr 2021 12:37:53 -0700
From:   Ricardo Koller <ricarkol@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com,
        Ricardo Koller <ricarkol@...gle.com>
Subject: [PATCH v2 3/6] x86/cpu: Expose CPUID regs, leaf and index definitions
 to tools

Move cpuid_regs, cpuid_regs_idx, and cpuid_leafs out of their
'#ifdef __KERNEL__' guards so that KVM selftests can reuse the
definitions in future patches.  Move cpuid_regs and cpuid_regs_idx from
processor.h to cpufeature.h to avoid blasting processor.h with several
'#ifdefs'.

Suggested-by: Sean Christopherson <seanjc@...gle.com>
Signed-off-by: Ricardo Koller <ricarkol@...gle.com>
---
 arch/x86/events/intel/pt.c        |  1 +
 arch/x86/include/asm/cpufeature.h | 23 ++++++++++++++++++-----
 arch/x86/include/asm/processor.h  | 11 -----------
 arch/x86/kernel/cpu/scattered.c   |  2 +-
 arch/x86/kernel/cpuid.c           |  2 +-
 5 files changed, 21 insertions(+), 18 deletions(-)

diff --git a/arch/x86/events/intel/pt.c b/arch/x86/events/intel/pt.c
index e94af4a54d0d..882b1478556e 100644
--- a/arch/x86/events/intel/pt.c
+++ b/arch/x86/events/intel/pt.c
@@ -21,6 +21,7 @@
 #include <asm/io.h>
 #include <asm/intel_pt.h>
 #include <asm/intel-family.h>
+#include <asm/cpufeature.h>
 
 #include "../perf_event.h"
 #include "pt.h"
diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
index 1728d4ce5730..22458ab5aac4 100644
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -2,12 +2,19 @@
 #ifndef _ASM_X86_CPUFEATURE_H
 #define _ASM_X86_CPUFEATURE_H
 
-#include <asm/processor.h>
+#include <linux/types.h>
 
-#if defined(__KERNEL__) && !defined(__ASSEMBLY__)
+#ifndef __ASSEMBLY__
+struct cpuid_regs {
+	u32 eax, ebx, ecx, edx;
+};
 
-#include <asm/asm.h>
-#include <linux/bitops.h>
+enum cpuid_regs_idx {
+	CPUID_EAX = 0,
+	CPUID_EBX,
+	CPUID_ECX,
+	CPUID_EDX,
+};
 
 enum cpuid_leafs
 {
@@ -32,6 +39,11 @@ enum cpuid_leafs
 	CPUID_7_EDX,
 	CPUID_8000_001F_EAX,
 };
+#ifdef __KERNEL__
+
+#include <asm/processor.h>
+#include <asm/asm.h>
+#include <linux/bitops.h>
 
 #ifdef CONFIG_X86_FEATURE_NAMES
 extern const char * const x86_cap_flags[NCAPINTS*32];
@@ -240,5 +252,6 @@ static __always_inline bool _static_cpu_has(u16 bit)
 #define CPU_FEATURE_TYPEVAL		boot_cpu_data.x86_vendor, boot_cpu_data.x86, \
 					boot_cpu_data.x86_model
 
-#endif /* defined(__KERNEL__) && !defined(__ASSEMBLY__) */
+#endif /* defined(__KERNEL__) */
+#endif /* !defined(__ASSEMBLY__) */
 #endif /* _ASM_X86_CPUFEATURE_H */
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index f1b9ed5efaa9..1d355d2a6e4e 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -142,17 +142,6 @@ struct cpuinfo_x86 {
 	unsigned		initialized : 1;
 } __randomize_layout;
 
-struct cpuid_regs {
-	u32 eax, ebx, ecx, edx;
-};
-
-enum cpuid_regs_idx {
-	CPUID_EAX = 0,
-	CPUID_EBX,
-	CPUID_ECX,
-	CPUID_EDX,
-};
-
 #define X86_VENDOR_INTEL	0
 #define X86_VENDOR_CYRIX	1
 #define X86_VENDOR_AMD		2
diff --git a/arch/x86/kernel/cpu/scattered.c b/arch/x86/kernel/cpu/scattered.c
index 21d1f062895a..bcbcda1e329b 100644
--- a/arch/x86/kernel/cpu/scattered.c
+++ b/arch/x86/kernel/cpu/scattered.c
@@ -6,7 +6,7 @@
 
 #include <asm/memtype.h>
 #include <asm/apic.h>
-#include <asm/processor.h>
+#include <asm/cpufeature.h>
 
 #include "cpu.h"
 
diff --git a/arch/x86/kernel/cpuid.c b/arch/x86/kernel/cpuid.c
index 6f7b8cc1bc9f..23e67220445b 100644
--- a/arch/x86/kernel/cpuid.c
+++ b/arch/x86/kernel/cpuid.c
@@ -37,7 +37,7 @@
 #include <linux/gfp.h>
 #include <linux/completion.h>
 
-#include <asm/processor.h>
+#include <asm/cpufeature.h>
 #include <asm/msr.h>
 
 static struct class *cpuid_class;
-- 
2.31.1.498.g6c1eba8ee3d-goog