diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.9.21/0048-x86-cpufeatures-Make-CPU-bugs-sticky.patch')
| -rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.9.21/0048-x86-cpufeatures-Make-CPU-bugs-sticky.patch | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.9.21/0048-x86-cpufeatures-Make-CPU-bugs-sticky.patch b/common/recipes-kernel/linux/linux-yocto-4.9.21/0048-x86-cpufeatures-Make-CPU-bugs-sticky.patch new file mode 100644 index 00000000..ac804370 --- /dev/null +++ b/common/recipes-kernel/linux/linux-yocto-4.9.21/0048-x86-cpufeatures-Make-CPU-bugs-sticky.patch @@ -0,0 +1,102 @@ +From 3d4dfd5b131c277aa7d44d00d1d6e7d084020b4c Mon Sep 17 00:00:00 2001 +From: Thomas Gleixner <tglx@linutronix.de> +Date: Mon, 4 Dec 2017 15:07:32 +0100 +Subject: [PATCH 048/102] x86/cpufeatures: Make CPU bugs sticky + +commit 6cbd2171e89b13377261d15e64384df60ecb530e upstream. + +There is currently no way to force CPU bug bits like CPU feature bits. That +makes it impossible to set a bug bit once at boot and have it stick for all +upcoming CPUs. + +Extend the force set/clear arrays to handle bug bits as well. + +Signed-off-by: Thomas Gleixner <tglx@linutronix.de> +Reviewed-by: Borislav Petkov <bp@suse.de> +Cc: Andy Lutomirski <luto@kernel.org> +Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> +Cc: Borislav Petkov <bp@alien8.de> +Cc: Borislav Petkov <bpetkov@suse.de> +Cc: Brian Gerst <brgerst@gmail.com> +Cc: Dave Hansen <dave.hansen@intel.com> +Cc: Dave Hansen <dave.hansen@linux.intel.com> +Cc: David Laight <David.Laight@aculab.com> +Cc: Denys Vlasenko <dvlasenk@redhat.com> +Cc: Eduardo Valentin <eduval@amazon.com> +Cc: Greg KH <gregkh@linuxfoundation.org> +Cc: H. Peter Anvin <hpa@zytor.com> +Cc: Josh Poimboeuf <jpoimboe@redhat.com> +Cc: Juergen Gross <jgross@suse.com> +Cc: Linus Torvalds <torvalds@linux-foundation.org> +Cc: Peter Zijlstra <peterz@infradead.org> +Cc: Rik van Riel <riel@redhat.com> +Cc: Will Deacon <will.deacon@arm.com> +Cc: aliguori@amazon.com +Cc: daniel.gruss@iaik.tugraz.at +Cc: hughd@google.com +Cc: keescook@google.com +Link: https://lkml.kernel.org/r/20171204150606.992156574@linutronix.de +Signed-off-by: Ingo Molnar <mingo@kernel.org> +Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> +Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> +--- + arch/x86/include/asm/cpufeature.h | 2 ++ + arch/x86/include/asm/processor.h | 4 ++-- + arch/x86/kernel/cpu/common.c | 6 +++--- + 3 files changed, 7 insertions(+), 5 deletions(-) + +diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h +index 1d2b69f..9ea67a0 100644 +--- a/arch/x86/include/asm/cpufeature.h ++++ b/arch/x86/include/asm/cpufeature.h +@@ -135,6 +135,8 @@ extern const char * const x86_bug_flags[NBUGINTS*32]; + set_bit(bit, (unsigned long *)cpu_caps_set); \ + } while (0) + ++#define setup_force_cpu_bug(bit) setup_force_cpu_cap(bit) ++ + #if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_X86_FAST_FEATURE_TESTS) + /* + * Static testing of CPU features. Used the same as boot_cpu_has(). +diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h +index 8cb52ee..e40b19c 100644 +--- a/arch/x86/include/asm/processor.h ++++ b/arch/x86/include/asm/processor.h +@@ -156,8 +156,8 @@ extern struct cpuinfo_x86 boot_cpu_data; + extern struct cpuinfo_x86 new_cpu_data; + + extern struct tss_struct doublefault_tss; +-extern __u32 cpu_caps_cleared[NCAPINTS]; +-extern __u32 cpu_caps_set[NCAPINTS]; ++extern __u32 cpu_caps_cleared[NCAPINTS + NBUGINTS]; ++extern __u32 cpu_caps_set[NCAPINTS + NBUGINTS]; + + #ifdef CONFIG_SMP + DECLARE_PER_CPU_READ_MOSTLY(struct cpuinfo_x86, cpu_info); +diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c +index 4c65225..ba9b601 100644 +--- a/arch/x86/kernel/cpu/common.c ++++ b/arch/x86/kernel/cpu/common.c +@@ -480,8 +480,8 @@ static const char *table_lookup_model(struct cpuinfo_x86 *c) + return NULL; /* Not found */ + } + +-__u32 cpu_caps_cleared[NCAPINTS]; +-__u32 cpu_caps_set[NCAPINTS]; ++__u32 cpu_caps_cleared[NCAPINTS + NBUGINTS]; ++__u32 cpu_caps_set[NCAPINTS + NBUGINTS]; + + void load_percpu_segment(int cpu) + { +@@ -710,7 +710,7 @@ static void apply_forced_caps(struct cpuinfo_x86 *c) + { + int i; + +- for (i = 0; i < NCAPINTS; i++) { ++ for (i = 0; i < NCAPINTS + NBUGINTS; i++) { + c->x86_capability[i] &= ~cpu_caps_cleared[i]; + c->x86_capability[i] |= cpu_caps_set[i]; + } +-- +2.7.4 + |