Re: [announce] [patch] KVM paravirtualization for Linux

Ingo Molnar
2007-01-08T09:47:42Z

* Avi Kivity <avi@qumranet.com> wrote:

> Looks like a lot of complexity for very little gain. I'm not sure
> what the vmwrite cost is, cut it can't be that high compared to
> vmexit.

while i disagree with characterising one extra parameter passed down
plus one extra branch as 'a lot of complexity', i agree that making the
flush a NOP on VMX is even better. (if it's possible without breaking
future hardware) I guess you are right that the only true cost here is
the vmwrite cost, and that there's no impact on CR3 flushing (because it
happens unconditionally). Forget about this patch.

Ingo