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Re: [PATCH] x86/CPU: extend is_forced_cpu_cap()'s "reach"
- To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 21 Jan 2026 08:58:39 +0000
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Wed, 21 Jan 2026 08:58:50 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 04/08/2025 12:28 pm, Jan Beulich wrote:
> "cpuid=no-rdrand" cannot actually be used to suppress the respective
> boot warning on certain AMD hardware. That's because cleared_caps[] are
> only applied after the ->c_init() hooks ran, i.e. cpu_has() still
> returns true in init_amd().
>
> Fixes: 93401e28a84b ("x86: clear RDRAND CPUID bit on AMD family 15h/16h")
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
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