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    Subject[RFC PATCH 2/4] EDAC, MCE, AMD: Add function to enable direct write to MCE MSRs
    Date
    From: Borislav Petkov <borislav.petkov@amd.com>

    Normally, writing to MCE MSRs causes a #GP. Add a function to enable
    direct access to those MSRs.

    Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
    ---
    drivers/edac/mce_amd_inj.c | 24 ++++++++++++++++++++++++
    1 files changed, 24 insertions(+), 0 deletions(-)

    diff --git a/drivers/edac/mce_amd_inj.c b/drivers/edac/mce_amd_inj.c
    index a4987e0..eb36e15 100644
    --- a/drivers/edac/mce_amd_inj.c
    +++ b/drivers/edac/mce_amd_inj.c
    @@ -30,6 +30,30 @@ static struct edac_mce_attr mce_attr_##_name = __ATTR(_name, _mode, _show, _stor
    static struct kobject *mce_kobj;

    /*
    + * Caller needs to be make sure this cpu doesn't disappear
    + * from under us, i.e.: get_cpu/put_cpu.
    + */
    +static int toggle_hw_mce_inject(unsigned int cpu, bool enable)
    +{
    + u32 l, h;
    + int err;
    +
    + err = rdmsr_on_cpu(cpu, MSR_K7_HWCR, &l, &h);
    + if (err) {
    + printk(KERN_ERR "%s: error reading HWCR\n", __func__);
    + return err;
    + }
    +
    + enable ? (l |= BIT(18)) : (l &= ~BIT(18));
    +
    + err = wrmsr_on_cpu(cpu, MSR_K7_HWCR, l, h);
    + if (err)
    + printk(KERN_ERR "%s: error writing HWCR\n", __func__);
    +
    + return err;
    +}
    +
    +/*
    * Collect all the MCi_XXX settings
    */
    static struct mce i_mce;
    --
    1.7.4.rc2


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