Messages in this thread Patch in this message | | | From | Borislav Petkov <> | Subject | [PATCH 2/5] x86, microcode, AMD: Add a reusable buffer | Date | Fri, 9 Dec 2011 19:08:52 +0100 |
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From: Borislav Petkov <borislav.petkov@amd.com>
Add a simple 4K page which gets allocated on driver init and freed on driver exit instead of vmalloc'ing small buffers for each ucode patch.
Signed-off-by: Borislav Petkov <borislav.petkov@amd.com> --- arch/x86/kernel/microcode_amd.c | 8 ++++++++ 1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kernel/microcode_amd.c b/arch/x86/kernel/microcode_amd.c index e8a68c2..9129c69 100644 --- a/arch/x86/kernel/microcode_amd.c +++ b/arch/x86/kernel/microcode_amd.c @@ -71,6 +71,9 @@ struct microcode_amd { static struct equiv_cpu_entry *equiv_cpu_table; +/* page-sized ucode patch buffer */ +void *patch; + static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig) { struct cpuinfo_x86 *c = &cpu_data(cpu); @@ -351,9 +354,14 @@ static struct microcode_ops microcode_amd_ops = { struct microcode_ops * __init init_amd_microcode(void) { + patch = (void *)get_zeroed_page(GFP_KERNEL); + if (!patch) + return NULL; + return µcode_amd_ops; } void __exit exit_amd_microcode(void) { + free_page((unsigned long)patch); } -- 1.7.8.rc0
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