Re: [Part1 PATCH v7 13/17] x86/io: Unroll string I/O when SEV is active

Alan Cox
2017-10-20T18:40:40Z

On Fri, 20 Oct 2017 09:30:55 -0500
Brijesh Singh <brijesh.singh@amd.com> wrote:

> From: Tom Lendacky <thomas.lendacky@amd.com>
>
> Secure Encrypted Virtualization (SEV) does not support string I/O, so
> unroll the string I/O operation into a loop operating on one element at
> a time.

Does this also mean that any firmware running in the virtual machine
(EFI, BIOS, VGA etc) has to be patched and if so shouldn't that be
documented somewhere ?

Alan