Re: [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@xxxxxxx>
> >
> > 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@xxxxxxx>
> > Signed-off-by: Brijesh Singh <brijesh.singh@xxxxxxx>
> > ---
> >   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

>