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

[Tomeu Vizoso]

On 3 November 2017 at 16:31, Tom Lendacky <thomas.lendacky@xxxxxxx> wrote:
> On 11/3/2017 10:12 AM, Tomeu Vizoso wrote:
>>
>> On 17 July 2017 at 23:10, Tom Lendacky <thomas.lendacky@xxxxxxx> 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@xxxxxxx>
>>> Signed-off-by: Tom Lendacky <thomas.lendacky@xxxxxxx>
>>> ---
>>>   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