Re: [Qemu-ppc] [Qemu-devel] [PATCH 28/32] ppc: Avoid double translation for lvx/lvxl/stvx/stvxl

[Richard Henderson]

On 07/29/2016 12:26 PM, Benjamin Herrenschmidt wrote:
> So I can't do something like set TCG_CALL_NO_RWG (nor TCG_CALL_NO_WG)
> on something like dcbz because it can take an exception, correct ?

You can't set NO_RWG, but you can say NO_WG.  It "reads" the registers via the 
exception (and it certainly has side effects).  But it doesn't write to the 
registers (along the normal return path; a loophole I've used elsewhere).


r~