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Commit 21690934 authored by Borislav Petkov's avatar Borislav Petkov
Browse files

EDAC, mce_amd_inj: Enable direct writes to MCE MSRs 



Normally, writing those causes a #GP but HWCR[McStatusWrEn] controls
that. Provide a knob.

Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
parent fd19fcd6

drivers/edac/mce_amd_inj.c

+24 −0
Original line number Diff line number Diff line
@@ -54,6 +54,30 @@ DEFINE_SIMPLE_ATTRIBUTE(status_fops, inj_status_get, inj_status_set, "%llx\n"); 
DEFINE_SIMPLE_ATTRIBUTE(misc_fops, inj_misc_get, inj_misc_set, "%llx\n");

DEFINE_SIMPLE_ATTRIBUTE(addr_fops, inj_addr_get, inj_addr_set, "%llx\n");



/*

 * 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) {

		pr_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)

		pr_err("%s: error writing HWCR\n", __func__);



	return err;

}



/*

 * This denotes into which bank we're injecting and triggers

 * the injection, at the same time.