Re: [PATCH] x86: Avoid divide by 0 in amd_smn_init()

[Borislav Petkov]

On Wed, Jun 24, 2026 at 03:08:08PM -0400, Jason Andryuk wrote:
> I think Ingo's suggestion to re-add the check will at least get systems
> booting again.  Then when Xen SMN accesses is sorted out, that can be
> changed as necessary.

You could do something like the totally untested thing (I'm hoping dom0 sets
X86_FEATURE_XENPV):

	...
        roots_per_node = num_roots / num_nodes;

	if (!roots_per_node) {
		if (!cpu_feature_enabled(X86_FEATURE_XENPV))
			pr_err(FW_BUG "Error detecting roots per node.");
               roots_per_node = 1;
	}

until we sort it out and as a stable fix perhaps...

Thx.

-- 
Regards/Gruss,
    Boris.

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