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xen-devel
Re: [Xen-devel] mini-guest io emulation
On 15 Mar 2006, at 03:03, Edwin Zhai wrote:
1. seems dom0 still need do the user interaction( screen painting,
kbd/mouse
detection), so how much performance gain with extra dom
switch(dom0<->mini
os<->VMX guest) ?
Some of those will not be critical path operations, and are moving to
mini-os only to clean up the control interfaces in dom0 (consistent
device interfaces for pv and hvm guests). In other cases we will still
get better performance because we get to define the minios<->dom0
interface and make it amenable to e.g., batching.
2. even with mini-os io emulation, pit/pic/iopaic/lapic still sit in
Hypervisior,
right?
Yes. The only reason not to put something in Xen is because the backend
cannot be implemented in Xen. Xen doesn't know about displays, so
display emulation does not go in Xen, for example.
3. we are currently doing the save/restore for VMX guest with the
expection that
mini-os emulation only affect device model save/resotore. we can
continue
current work (just save the qemu-dm state) and sync with mini os in
future.
yes.
-- Keir
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