diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.9.21/0002-x86-mm-Add-the-nopcid-boot-option-to-turn-off-PCID.patch')
| -rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.9.21/0002-x86-mm-Add-the-nopcid-boot-option-to-turn-off-PCID.patch | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.9.21/0002-x86-mm-Add-the-nopcid-boot-option-to-turn-off-PCID.patch b/common/recipes-kernel/linux/linux-yocto-4.9.21/0002-x86-mm-Add-the-nopcid-boot-option-to-turn-off-PCID.patch new file mode 100644 index 00000000..ca442137 --- /dev/null +++ b/common/recipes-kernel/linux/linux-yocto-4.9.21/0002-x86-mm-Add-the-nopcid-boot-option-to-turn-off-PCID.patch @@ -0,0 +1,77 @@ +From 745a39ba56433b3a62b6c9fba45efa0038a0f19b Mon Sep 17 00:00:00 2001 +From: Andy Lutomirski <luto@kernel.org> +Date: Thu, 29 Jun 2017 08:53:20 -0700 +Subject: [PATCH 002/102] x86/mm: Add the 'nopcid' boot option to turn off PCID + +commit 0790c9aad84901ca1bdc14746175549c8b5da215 upstream. + +The parameter is only present on x86_64 systems to save a few bytes, +as PCID is always disabled on x86_32. + +Signed-off-by: Andy Lutomirski <luto@kernel.org> +Reviewed-by: Nadav Amit <nadav.amit@gmail.com> +Reviewed-by: Borislav Petkov <bp@suse.de> +Reviewed-by: Thomas Gleixner <tglx@linutronix.de> +Cc: Andrew Morton <akpm@linux-foundation.org> +Cc: Arjan van de Ven <arjan@linux.intel.com> +Cc: Borislav Petkov <bp@alien8.de> +Cc: Dave Hansen <dave.hansen@intel.com> +Cc: Linus Torvalds <torvalds@linux-foundation.org> +Cc: Mel Gorman <mgorman@suse.de> +Cc: Peter Zijlstra <peterz@infradead.org> +Cc: Rik van Riel <riel@redhat.com> +Cc: linux-mm@kvack.org +Link: http://lkml.kernel.org/r/8bbb2e65bcd249a5f18bfb8128b4689f08ac2b60.1498751203.git.luto@kernel.org +Signed-off-by: Ingo Molnar <mingo@kernel.org> +Cc: Hugh Dickins <hughd@google.com> +Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> +--- + Documentation/kernel-parameters.txt | 2 ++ + arch/x86/kernel/cpu/common.c | 18 ++++++++++++++++++ + 2 files changed, 20 insertions(+) + +diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt +index 65b05ba..a303387 100644 +--- a/Documentation/kernel-parameters.txt ++++ b/Documentation/kernel-parameters.txt +@@ -2785,6 +2785,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted. + nopat [X86] Disable PAT (page attribute table extension of + pagetables) support. + ++ nopcid [X86-64] Disable the PCID cpu feature. ++ + norandmaps Don't use address space randomization. Equivalent to + echo 0 > /proc/sys/kernel/randomize_va_space + +diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c +index 4eece91..81c8a53 100644 +--- a/arch/x86/kernel/cpu/common.c ++++ b/arch/x86/kernel/cpu/common.c +@@ -163,6 +163,24 @@ static int __init x86_mpx_setup(char *s) + } + __setup("nompx", x86_mpx_setup); + ++#ifdef CONFIG_X86_64 ++static int __init x86_pcid_setup(char *s) ++{ ++ /* require an exact match without trailing characters */ ++ if (strlen(s)) ++ return 0; ++ ++ /* do not emit a message if the feature is not present */ ++ if (!boot_cpu_has(X86_FEATURE_PCID)) ++ return 1; ++ ++ setup_clear_cpu_cap(X86_FEATURE_PCID); ++ pr_info("nopcid: PCID feature disabled\n"); ++ return 1; ++} ++__setup("nopcid", x86_pcid_setup); ++#endif ++ + static int __init x86_noinvpcid_setup(char *s) + { + /* noinvpcid doesn't accept parameters */ +-- +2.7.4 + |