Re: [RFC PATCH v5 4/4] x86/acrn: Add hypercall for ACRN guest
From: Borislav Petkov
Date: Mon Apr 29 2019 - 03:36:35 EST
On Mon, Apr 29, 2019 at 09:24:12AM +0800, Zhao, Yakui wrote:
> Yes. "movq" only indicates explicitly that it is 64-bit mov as ACRN guest
> only works under 64-bit mode.
> I also check the usage of "mov" and "movq" in this scenario. There is no
> difference except that the movq is an explicit 64-op.
Damn, I'm tired of explaining this: it is explicit only to the code
reader. gcc generates the *same* instruction no matter whether it has a
"q" suffix or not as long as the destination register is a 64-bit one.
If you prefer to have it explicit, sure, use "movq".
Good mailing practices for 400: avoid top-posting and trim the reply.