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Commit 96b0ee45 authored by Borislav Petkov's avatar Borislav Petkov Committed by Borislav Petkov
Browse files

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: default avatarBorislav Petkov <borislav.petkov@amd.com>
parent f72c1a57

arch/x86/kernel/microcode_amd.c

+8 −0
Original line number Diff line number Diff line
@@ -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 &microcode_amd_ops;

}



void __exit exit_amd_microcode(void)

{

	free_page((unsigned long)patch);

}