On 18.05.2009, at 17:20, Avi Kivity wrote:
Alexander Graf wrote:
On 18.05.2009, at 15:29, Avi Kivity wrote:
Alexander Graf wrote:
There's only a limited potential here (a factor of three,
reducing 6 exits to 2, less the emulation overhead). There's a
lot more to be gained from nested npt, since you'll avoid most
of the original exits in the first place.
I think the reversed is the case. Look at those numbers (w2k8
bootup):
http://pastebin.ca/1423596
The only thing nested NPT would achieve is a reduction of #NPF
exits. But they are absolutely in the minority today already.
Normal #PF's do get directly passed to the guest already.
#NPF exits are caused when guest/host mappings change, which they
don't, or by mmio (which happens both for guest and nguest).
I don't understand how you can pass #PFs directly to the guest.
Surely the guest has enabled pagefault interception, and you need
to set up its vmcb?
I guess you're right: http://pastebin.ca/1426458
Any idea where the ioio exits come from? If it's IDE, we can
eliminate them by using virtio.
I'm still not getting kvmtrace to work. ./kvmtrace -o log only gives
me empty files (4 bytes each), even though I did ./configure --with-
kvm-trace in the kernel dir.
Alex
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