diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.9.21/0082-x86-cpufeature-Move-processor-tracing-out-of-scatter.patch')
| -rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.9.21/0082-x86-cpufeature-Move-processor-tracing-out-of-scatter.patch | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.9.21/0082-x86-cpufeature-Move-processor-tracing-out-of-scatter.patch b/common/recipes-kernel/linux/linux-yocto-4.9.21/0082-x86-cpufeature-Move-processor-tracing-out-of-scatter.patch new file mode 100644 index 00000000..c57772cc --- /dev/null +++ b/common/recipes-kernel/linux/linux-yocto-4.9.21/0082-x86-cpufeature-Move-processor-tracing-out-of-scatter.patch @@ -0,0 +1,73 @@ +From f062c304538bab4228fa57dfe33eb1521d764127 Mon Sep 17 00:00:00 2001 +From: Paolo Bonzini <pbonzini@redhat.com> +Date: Tue, 16 Jan 2018 16:42:25 +0100 +Subject: [PATCH 082/103] x86/cpufeature: Move processor tracing out of + scattered features +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +commit 4fdec2034b7540dda461c6ba33325dfcff345c64 upstream. + +Processor tracing is already enumerated in word 9 (CPUID[7,0].EBX), +so do not duplicate it in the scattered features word. + +Besides being more tidy, this will be useful for KVM when it presents +processor tracing to the guests. KVM selects host features that are +supported by both the host kernel (depending on command line options, +CPU errata, or whatever) and KVM. Whenever a full feature word exists, +KVM's code is written in the expectation that the CPUID bit number +matches the X86_FEATURE_* bit number, but this is not the case for +X86_FEATURE_INTEL_PT. + +Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> +Cc: Borislav Petkov <bp@suse.de> +Cc: Linus Torvalds <torvalds@linux-foundation.org> +Cc: Luwei Kang <luwei.kang@intel.com> +Cc: Peter Zijlstra <peterz@infradead.org> +Cc: Radim Krčmář <rkrcmar@redhat.com> +Cc: Thomas Gleixner <tglx@linutronix.de> +Cc: kvm@vger.kernel.org +Link: http://lkml.kernel.org/r/1516117345-34561-1-git-send-email-pbonzini@redhat.com +Signed-off-by: Ingo Molnar <mingo@kernel.org> +Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> +--- + arch/x86/include/asm/cpufeatures.h | 2 +- + arch/x86/kernel/cpu/scattered.c | 1 - + 2 files changed, 1 insertion(+), 2 deletions(-) + +diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h +index 2f60cb5..8537a21 100644 +--- a/arch/x86/include/asm/cpufeatures.h ++++ b/arch/x86/include/asm/cpufeatures.h +@@ -197,7 +197,6 @@ + #define X86_FEATURE_RETPOLINE ( 7*32+12) /* Generic Retpoline mitigation for Spectre variant 2 */ + #define X86_FEATURE_RETPOLINE_AMD ( 7*32+13) /* AMD Retpoline mitigation for Spectre variant 2 */ + +-#define X86_FEATURE_INTEL_PT ( 7*32+15) /* Intel Processor Trace */ + #define X86_FEATURE_AVX512_4VNNIW (7*32+16) /* AVX-512 Neural Network Instructions */ + #define X86_FEATURE_AVX512_4FMAPS (7*32+17) /* AVX-512 Multiply Accumulation Single precision */ + #define X86_FEATURE_RSB_CTXSW ( 7*32+19) /* Fill RSB on context switches */ +@@ -236,6 +235,7 @@ + #define X86_FEATURE_SMAP ( 9*32+20) /* Supervisor Mode Access Prevention */ + #define X86_FEATURE_CLFLUSHOPT ( 9*32+23) /* CLFLUSHOPT instruction */ + #define X86_FEATURE_CLWB ( 9*32+24) /* CLWB instruction */ ++#define X86_FEATURE_INTEL_PT ( 9*32+25) /* Intel Processor Trace */ + #define X86_FEATURE_AVX512PF ( 9*32+26) /* AVX-512 Prefetch */ + #define X86_FEATURE_AVX512ER ( 9*32+27) /* AVX-512 Exponential and Reciprocal */ + #define X86_FEATURE_AVX512CD ( 9*32+28) /* AVX-512 Conflict Detection */ +diff --git a/arch/x86/kernel/cpu/scattered.c b/arch/x86/kernel/cpu/scattered.c +index 1db8dc4..b0dd9ae 100644 +--- a/arch/x86/kernel/cpu/scattered.c ++++ b/arch/x86/kernel/cpu/scattered.c +@@ -31,7 +31,6 @@ void init_scattered_cpuid_features(struct cpuinfo_x86 *c) + const struct cpuid_bit *cb; + + static const struct cpuid_bit cpuid_bits[] = { +- { X86_FEATURE_INTEL_PT, CR_EBX,25, 0x00000007, 0 }, + { X86_FEATURE_AVX512_4VNNIW, CR_EDX, 2, 0x00000007, 0 }, + { X86_FEATURE_AVX512_4FMAPS, CR_EDX, 3, 0x00000007, 0 }, + { X86_FEATURE_APERFMPERF, CR_ECX, 0, 0x00000006, 0 }, +-- +2.7.4 + |