linux-kernel - Re: [PATCH] x86/umip: Make the UMIP activated message generic

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Date:   Wed, 5 Dec 2018 08:47:09 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     "Lendacky, Thomas" <Thomas.Lendacky@....com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>, Ingo Molnar <mingo@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] x86/umip: Make the UMIP activated message generic


* Lendacky, Thomas <Thomas.Lendacky@....com> wrote:

> The User Mode Instruction Prevention (UMIP) feature is part of the x86_64
> instruction set architecture and not specific to Intel.  Make the message
> generic.
> 
> Signed-off-by: Tom Lendacky <thomas.lendacky@....com>
> ---
> 
> This patch is against the x86/cpu branch of the tip tree:
>   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/cpu
> 
>  arch/x86/kernel/cpu/common.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
> index 2c56b80..cb28e98 100644
> --- a/arch/x86/kernel/cpu/common.c
> +++ b/arch/x86/kernel/cpu/common.c
> @@ -353,7 +353,7 @@ static __always_inline void setup_umip(struct cpuinfo_x86 *c)
>  
>  	cr4_set_bits(X86_CR4_UMIP);
>  
> -	pr_info_once("x86/cpu: Intel User Mode Instruction Prevention (UMIP) activated\n");
> +	pr_info_once("x86/cpu: User Mode Instruction Prevention (UMIP) activated\n");

Is there any public information about which AMD CPUs are going to support 
it?

The latest AMD CPU I can test on is a Ryzen Threadripper 1950X, and that 
doesn't have UMIP.

Thanks,

	Ingo