On Tue, Oct 20, 2020 at 10:12:59AM -0400, Arvind Sankar wrote:
> On Tue, Oct 20, 2020 at 02:18:54PM +0200, Joerg Roedel wrote:
> Why use r10-r12 rather than the caller-save registers? Even for the head
> code where you need to perserve the cr3 value you can just return it in
> rax?
It can surely be optimized, but it makes the code less robust. This
function is only called from assembly so the standard x86-64 calling
conventions might not be followed strictly. I think its better to make
as few assumptions as possible about the calling code to avoid
regressions. Changes to the head code are not necessarily tested with
SEV/SEV-ES guests by developers.
Regards,
Joerg
