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From: Andy Lutomirski <luto@kernel.org>
Date: Thu, 26 Oct 2017 02:02:02 -0700
Message-ID: <CALCETrXw2r-HD+9SwT0ndRVX2YR-_g6BKEfDd6i0ci5q_Z4S4Q@mail.gmail.com>
Subject: Re: [PATCH v9 02/29] x86/boot: Relocate definition of the initial
 state of CR0
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To: Borislav Petkov <bp@suse.de>
Cc: Andy Lutomirski <luto@kernel.org>, Ricardo Neri <ricardo.neri-calderon@linux.intel.com>, Ingo Molnar <mingo@redhat.com>, Thomas Gleixner <tglx@linutronix.de>, "H. Peter Anvin" <hpa@zytor.com>, Peter Zijlstra <peterz@infradead.org>, Andrew Morton <akpm@linux-foundation.org>, Brian Gerst <brgerst@gmail.com>, Chris Metcalf <cmetcalf@mellanox.com>, Dave Hansen <dave.hansen@linux.intel.com>, Paolo Bonzini <pbonzini@redhat.com>, Liang Z Li <liang.z.li@intel.com>, Masami Hiramatsu <mhiramat@kernel.org>, Huang Rui <ray.huang@amd.com>, Jiri Slaby <jslaby@suse.cz>, Jonathan Corbet <corbet@lwn.net>, "Michael S. Tsirkin" <mst@redhat.com>, Paul Gortmaker <paul.gortmaker@windriver.com>, Vlastimil Babka <vbabka@suse.cz>, Chen Yucong <slaoub@gmail.com>, "Ravi V. Shankar" <ravi.v.shankar@intel.com>, Shuah Khan <shuah@kernel.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, X86 ML <x86@kernel.org>, "Neri, Ricardo" <ricardo.neri@intel.com>, Dave Hansen <dave.hansen@intel.com>, Denys Vlasenko <dvlasenk@redhat.com>, Josh Poimboeuf <jpoimboe@redhat.com>, Linus Torvalds <torvalds@linux-foundation.org>, linux-arch <linux-arch@vger.kernel.org>, "linux-mm@kvack.org" <linux-mm@kvack.org>

On Thu, Oct 26, 2017 at 2:00 AM, Borislav Petkov <bp@suse.de> wrote:
> On Thu, Oct 26, 2017 at 12:51:25AM -0700, Andy Lutomirski wrote:
>> with the slight caveat that I think it might be a wee bit better if
>> UMIP emulation used a separate define UMIP_REPORTED_CR0.
>
> Why, do you see CR0_STATE and UMIP_REPORTED_CR0 becoming different at
> some point?

I'm assuming that UMIP_REPORTED_CR0 will never change.  If CR0 gets a
new field that we set some day, then I assume that CR0_STATE would add
that bit but UMIP_REPORTED_CR0 would not.

>
> --
> Regards/Gruss,
>     Boris.
>
> SUSE Linux GmbH, GF: Felix Imend=C3=B6rffer, Jane Smithard, Graham Norton=
, HRB 21284 (AG N=C3=BCrnberg)
> --

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