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    Subject[PATCH 2/5] x86, microcode, AMD: Add a reusable buffer
    Date
    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 &microcode_amd_ops;
    }

    void __exit exit_amd_microcode(void)
    {
    + free_page((unsigned long)patch);
    }
    --
    1.7.8.rc0


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