[RFC Part1 PATCH v3 05/17] x86, realmode: Don't decrypt trampoline area under SEV

[Tom Lendacky]

On 7/26/2017 11:03 AM, Borislav Petkov wrote:
>   Subject: x86/realmode: ...

Done.

> 
> On Mon, Jul 24, 2017 at 02:07:45PM -0500, Brijesh Singh wrote:
>> From: Tom Lendacky <thomas.lendacky at amd.com>
>>
>> When SEV is active the trampoline area will need to be in encrypted
>> memory so only mark the area decrypted if SME is active.
>>
>> Signed-off-by: Tom Lendacky <thomas.lendacky at amd.com>
>> Signed-off-by: Brijesh Singh <brijesh.singh at amd.com>
>> ---
>>   arch/x86/realmode/init.c | 6 ++++--
>>   1 file changed, 4 insertions(+), 2 deletions(-)
>>
>> diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c
>> index 1f71980..c7eeca7 100644
>> --- a/arch/x86/realmode/init.c
>> +++ b/arch/x86/realmode/init.c
>> @@ -63,9 +63,11 @@ static void __init setup_real_mode(void)
>>   	/*
>>   	 * If SME is active, the trampoline area will need to be in
>>   	 * decrypted memory in order to bring up other processors
>> -	 * successfully.
>> +	 * successfully. For SEV the trampoline area needs to be in
>> +	 * encrypted memory, so only do this for SME.
> 
> Or simply say:
> 
> "It is not needed for SEV."

Will do.

Thanks,
Tom

>