linux-kernel - Re: [PATCH 2/2] x86/rdrand: hide RDRAND and RDSEED from CPUID in case of a malfunction

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Message-ID: <20250312124530.GDZ9GB6vscPTpDv8Aq@fat_crate.local>
Date: Wed, 12 Mar 2025 13:45:30 +0100
From: Borislav Petkov <bp@...en8.de>
To: Mikhail Paulyshka <me@...aill.net>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] x86/rdrand: hide RDRAND and RDSEED from CPUID in
 case of a malfunction

On Wed, Mar 12, 2025 at 03:31:30PM +0300, Mikhail Paulyshka wrote:
> @@ -46,6 +47,8 @@ void x86_init_rdrand(struct cpuinfo_x86 *c)
>  
>  	if (failure) {
>  		clear_cpu_cap(c, X86_FEATURE_RDRAND);
> +		if (c->x86_vendor == X86_VENDOR_AMD || c->x86_vendor == X86_VENDOR_HYGON)

Hygon is family 0x18. Have you tested it there?

-- 
Regards/Gruss,
    Boris.

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