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xen-devel
Re: [Xen-devel] Question on shadow_invlpg return value handling.
At 15:49 +0530 on 27 Mar (1175010562), jeet wrote:
> If on VM entry TLB is flushed why we are handling instruction "invlpg" in xen
> can't this be done by doing VMexit and VM entry as this would do flushing of
> TLB?
Yes, for now that's true. When the tagged TLB comes back it won't be;
and after 3.0.5 we might be doing some more optimizations that will need
to hook off the paging_invlpg call.
> Is this TLB flush done due to loading of guest state (mov to cr3)?
> or
> Is TLB flush on VM entry hardware feature or is implemented in Xen ?
Hardware.
You should really read volume 2 section 15 of the AMD manual, and volume
3a chapters 19-27 of the Intel manuals.
Tim.
--
Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx>, XenSource UK Limited
Registered office c/o EC2Y 5EB, UK; company number 05334508
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