HAXM is about 10x slower than kvm in Nested virtualization environment

[GGBond1989]

I have 2 vm running in a linux host accel by kvm。One is windows10 and the other is ubuntu19.1 ，both installed android studio。The android emulator is pretty slower in the windows system accel by haxm , it takes about 5min to boot up。And in the ubuntu，the emulator take about 30s to boot up accel by kvm。

I noticed that , there is a pull request "Optimizing VMCS reads/writes with a new cache implementation" try to fix this problem ，is there any progress？or is there some patch i can test ?

[wcwang]

Thanks for your report. KVM supports nested virtualization while HAXM has not yet. That is why the emulator within the Ubuntu guest can boot up fast while Windows guest cannot.
The pull request #130 will not resolve this issue completely. This pull request is under review and rebasing. You may retrieve the current patches through below commands. Thanks.

$ git checkout -b kryptoslogic-vmcs-refactor master
$ git pull https://github.com/kryptoslogic/haxm.git vmcs-refactor

[nevilad]

Android studio can understand that it runs in a virtual machine and don't uses haxm in this case? And in ubuntu android studio uses kvm, not haxm?