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

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Date:   Wed, 5 Dec 2018 14:43:09 +0000
From:   "Lendacky, Thomas" <Thomas.Lendacky@....com>
To:     Ingo Molnar <mingo@...nel.org>
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

On 12/05/2018 01:47 AM, Ingo Molnar wrote:
> 
> * 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?

No public information yet...

Thanks,
Tom

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