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 smtp.mailfrom=Thomas.Lendacky@amd.com; 
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,
        x86@kernel.org, linux-efi@vger.kernel.org,
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        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
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        Tony Luck <tony.luck@intel.com>, Piotr Luc <piotr.luc@intel.com>,
        Fenghua Yu <fenghua.yu@intel.com>, Lu Baolu <baolu.lu@linux.intel.com>,
        Reza Arbab <arbab@linux.vnet.ibm.com>,
        David Howells <dhowells@redhat.com>,
        Matt Fleming <matt@codeblueprint.co.uk>,
        "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
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        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
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        =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= <rkrcmar@redhat.com>,
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References: <20170724190757.11278-1-brijesh.singh@amd.com>
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 <20170725102657.GD21822@nazgul.tnic>
 <7236d267-ebcb-8b45-b8d3-5955903e395f@amd.com>
 <20170725143615.GA26029@nazgul.tnic>
From: Tom Lendacky <thomas.lendacky@amd.com>
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Date: Tue, 25 Jul 2017 09:58:54 -0500
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On 7/25/2017 9:36 AM, Borislav Petkov wrote:
> On Tue, Jul 25, 2017 at 09:29:40AM -0500, Tom Lendacky wrote:
>> Yup, we can do something like that.  I believe the only change that
>> would be needed to your patch would be to move the IS_ENABLED() check
>> to after the physical address space reduction check.
> 
> Yeah, I wasn't sure about that. The logic is that if BIOS has enabled
> SME and thus reduction is in place, we need to update x86_phys_bits on
> 32-bit regardless, right?
> 
> But, come to think of it, that reduction won't have any effect since we
> have 32-bit addresses and the reduction is above 32-bits, right? And
> thus it is moot.


True, but it is more about being accurate and making sure the value is
correct where ever it may be used.

Thanks,
Tom

> 
> Or?
>