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x86, microcode, AMD: Add a reusable buffer

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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>
This commit is contained in:
Borislav Petkov 2011-12-02 17:16:55 +01:00 committed by Borislav Petkov
parent f72c1a5765
commit 96b0ee4588
1 changed files with 8 additions and 0 deletions
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8
arch/x86/kernel/microcode_amd.c
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@ -71,6 +71,9 @@ struct microcode_amd {
static struct equiv_cpu_entry *equiv_cpu_table; 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) static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig)
{ {
struct cpuinfo_x86 *c = &cpu_data(cpu); 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) struct microcode_ops * __init init_amd_microcode(void)
{ {
patch = (void *)get_zeroed_page(GFP_KERNEL);
if (!patch)
return NULL;
return &microcode_amd_ops; return &microcode_amd_ops;
} }
void __exit exit_amd_microcode(void) void __exit exit_amd_microcode(void)
{ {
free_page((unsigned long)patch);
} }