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

[Jacob Pan]

Hi Peter,

On Wed, 29 May 2024 14:12:19 -0700, "H. Peter Anvin" <hpa@xxxxxxxxx> wrote:

> 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.
> 
right, should return 0 and poll all handlers.

Thanks,

Jacob