Re: [PATCH 08/26] KVM: PPC: Add PV guest critical sections

Alexander Graf
2010-06-27T11:49:36Z

Am 27.06.2010 um 12:59 schrieb Avi Kivity <avi-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>:

> On 06/27/2010 01:33 PM, Alexander Graf wrote:
>>> Or inc/dec...
>>
>>
>> Uh - huh? How would that help?
>
> inc shared->critical # disable interrupts

There is no opcode in the ppc isa that acts on momery without
involving a register.

An inc would be:

ld rX, A(0)
addi rX, rX, 1
std rX, A(0)

Alex
>