linux-kernel - Re: SME/32-bit regression

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Message-ID: <56f022a2-e363-0524-68ba-c31950d96e0d@amd.com>
Date:   Wed, 6 Sep 2017 13:06:50 -0500
From:   Brijesh Singh <brijesh.singh@....com>
To:     Borislav Petkov <bp@...en8.de>,
        "Lendacky, Thomas" <Thomas.Lendacky@....com>
Cc:     brijesh.singh@....com,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        X86 ML <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: SME/32-bit regression



On 09/06/2017 11:44 AM, Borislav Petkov wrote:
> On Wed, Sep 06, 2017 at 04:30:23PM +0000, Lendacky, Thomas wrote:
>> Sorry for the top post, I'm on holiday and don't have access to a good
>> email client... I went with unsigned long to match all the page table
>> related declarations. If changing to u64 doesn't generate any warnings
>> or other issues them I'm good with that.
> 
> Ok, no worries. Lemme run the smoke-tests on it and test it to see
> everything else still works.
> 

I did the following quick run with your patch and everything seems to be
working okay

64-bit build:
-------
1) Baremetal SME *enabled* - System boots fine
  a) 32-bit guest launch : successful (KVM HV)
  b) 64-bit guest launch : successful (KVM HV)
  c) 64-bit SEV guest launch : successful (KVM HV)

2) Baremetal SME *disabled* - System boots fine
  a) 32-bit guest launch : successful (KVM HV)
  b) 64-bit guest launch : successful (KVM HV)
  c) 64-bit SEV guest launch : successful (KVM HV)

32-bit build
----------
I am installing 32-bit distro to verify 32-bit baremetal boot and will
report my findings soon.

-Brijesh