Re: [PATCH 0/5] KVM paravirt_ops backend (v3)

As for performance, I've got a few interesting results.  kbuild with a 
guest using 2G of memory goes from 19 minutes to 12 minutes with the 
full series applied.  Using 512mb, the build time goes from 10.75 
minutes to 9 minutes.  For 512mb, native is around 7 minutes so that's 
pretty close to what Avi had seen.  The more dramatic improvement with 
large memory guests is probably because of the increased shadow page 
table activity due to high mem.

Exactly, physical memory above 896M on x86_32 are mapped using temp
mapping, which needs lots of invlpg instructions.
On xen, it needs to wake all the shadows to find the shadow of high mem,
since Xen doesn't use reverse map. On KVM, should be much better.
-Xin

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