Re: [PATCH 4/6] x86/irq: Process nmi sources in NMI handler

[H. Peter Anvin]

On 5/29/24 13:33, Jacob Pan wrote:
> +
> +	rcu_read_lock();
> +	/* Bit 0 is for unknown NMI sources, skip it. */
> +	for_each_set_bit_from(vec, &source_bitmask, NR_NMI_SOURCE_VECTORS) {
> +		a = rcu_dereference(nmiaction_src_table[vec]);
> +		if (!a) {
> +			pr_warn_ratelimited("NMI received %d no handler", vec);
> +			continue;
> +		}

In this case, you should assume some chipset hardware or VMM is giving 
you garbage in the event bitmask, and treat it as if bit 0 were set.

	-hpa