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Subject: Re: [RFC Part1 PATCH v3 02/17] x86/CPU/AMD: Add the Secure Encrypted
 Virtualization CPU feature
To: Borislav Petkov <bp@suse.de>
Cc: Brijesh Singh <brijesh.singh@amd.com>, linux-kernel@vger.kernel.org,
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 <20170725151301.GC26029@nazgul.tnic>
From: Tom Lendacky <thomas.lendacky@amd.com>
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Date: Tue, 25 Jul 2017 10:29:40 -0500
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On 7/25/2017 10:13 AM, Borislav Petkov wrote:
> On Tue, Jul 25, 2017 at 09:58:54AM -0500, Tom Lendacky wrote:
>> True, but it is more about being accurate and making sure the value is
>> correct where ever it may be used.
> 
> So early_identify_cpu() initializes phys_bits to 32 on 32-bit.
> Subtracting it there would actually make actively it wrong, AFAICT.

But early_identify_cpu() calls get_cpu_cap() which will check for cpuid
leaf 0x80000008 support and set x86_phys_bits.  I'll try to build and
run a 32-bit kernel and see how this all flows.

Thanks,
Tom

>