From 96b0ee4588036b6fa7cf38c17a9e40531241e895 Mon Sep 17 00:00:00 2001 From: Borislav Petkov Date: Fri, 2 Dec 2011 17:16:55 +0100 Subject: [PATCH] x86, microcode, AMD: Add a reusable buffer 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 --- arch/x86/kernel/microcode_amd.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/x86/kernel/microcode_amd.c b/arch/x86/kernel/microcode_amd.c index e8a68c2a4364..9129c6981c5b 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); } -- 2.39.2