linux-kernel - Re: [PATCH v10 20/38] x86, mpparse: Use memremap to map the mpf and mpc data

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Date:   Mon, 6 Nov 2017 08:13:02 +0100
From:   Tomeu Vizoso <tomeu@...euvizoso.net>
To:     Tom Lendacky <thomas.lendacky@....com>
Cc:     x86@...nel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-arch@...r.kernel.org, linux-efi@...r.kernel.org,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        linux-mm@...ck.org, kvm@...r.kernel.org,
        kasan-dev@...glegroups.com,
        Radim Krčmář <rkrcmar@...hat.com>,
        Arnd Bergmann <arnd@...db.de>,
        Jonathan Corbet <corbet@....net>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Alexander Potapenko <glider@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Rik van Riel <riel@...hat.com>,
        Larry Woodman <lwoodman@...hat.com>,
        Dave Young <dyoung@...hat.com>,
        Toshimitsu Kani <toshi.kani@....com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Brijesh Singh <brijesh.singh@....com>,
        Guenter Roeck <groeck@...gle.com>,
        Zach Reizner <zachr@...gle.com>,
        Dylan Reid <dgreid@...omium.org>
Subject: Re: [PATCH v10 20/38] x86, mpparse: Use memremap to map the mpf and
 mpc data

On 3 November 2017 at 16:31, Tom Lendacky <thomas.lendacky@....com> wrote:
> On 11/3/2017 10:12 AM, Tomeu Vizoso wrote:
>>
>> On 17 July 2017 at 23:10, Tom Lendacky <thomas.lendacky@....com> wrote:
>>>
>>> The SMP MP-table is built by UEFI and placed in memory in a decrypted
>>> state. These tables are accessed using a mix of early_memremap(),
>>> early_memunmap(), phys_to_virt() and virt_to_phys(). Change all accesses
>>> to use early_memremap()/early_memunmap(). This allows for proper setting
>>> of the encryption mask so that the data can be successfully accessed when
>>> SME is active.
>>>
>>> Reviewed-by: Borislav Petkov <bp@...e.de>
>>> Signed-off-by: Tom Lendacky <thomas.lendacky@....com>
>>> ---
>>>   arch/x86/kernel/mpparse.c | 98
>>> +++++++++++++++++++++++++++++++++--------------
>>>   1 file changed, 70 insertions(+), 28 deletions(-)
>>
>>
>> Hi there,
>>
>> today I played a bit with crosvm [0] and noticed that 4.14-rc7 doesn't
>> boot. git-bisect pointed to this patch, and reverting it indeed gets
>> things working again.
>>
>> Anybody has an idea of why this could be?
>
>
> If you send me your kernel config I'll see if I can reproduce the issue
> and debug it.

x86_64_defconfig should be enough. I have pasted my dev env
instructions here in case they help:

http://blog.tomeuvizoso.net/2017/11/experiments-with-crosvm_6.html

Thanks,

Tomeu