Re: [Qemu-devel] Nested KVM is weird?

[Jun Koi]

On Sun, Jun 1, 2014 at 5:59 PM, Muli Ben-Yehuda <address@hidden> wrote:

On Sun, Jun 01, 2014 at 05:54:25PM +0700, Jun Koi wrote:

> So this means ESXi never uses VMResume/VMLaunch? How is this
> possible, because it uses VMX for its implementation?

ESXi will fall back to binary translation if it decides that it cannot
use VMX for some reason. Look at the L2's log file inside ESXi and you
will likely find some errors related to running nested, MSRs KVM does
not emulate properly, or something else that causes ESXi to use binary
translation for its L2.

now i noticed in dmesg output, there is one message with content:

    " VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL does not work properly. Using workaround"

(1) do you think this VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL is the reason why ESXi falls back to binary translation?

(3) how hard it is to fix this issue, so we have complete support for ESXi?

thanks,

Jun