Hi Alan, On 10/20/17 1:39 PM, Alan Cox wrote: > On Fri, 20 Oct 2017 09:30:55 -0500 > Brijesh Singh <brijesh.singh@xxxxxxx> wrote: > >> From: Tom Lendacky <thomas.lendacky@xxxxxxx> >> >> 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 ? Yes. SEV support has been added to EDK2/OVMF virtual machine bios and we have similar patch [1]. [1] https://github.com/tianocore/edk2/commit/b6d11d7c467810ea7f2e2eda46ef0bdc57bf1475 -Brijesh
