Anthony Liguori wrote:
Nitin A Kamble wrote:
Avi,
A new VMX feature "Unrestricted Guest" feature is added in the VMX
specification. You can look at the latest Intel processor manual for
details of the feature here:
http://www.intel.com/products/processor/manuals
It allows kvm guests to run real mode and unpaged mode
code natively in the VMX mode when EPT is turned on. With the
unrestricted guest there is no need to emulate the guest real mode code
in the vm86 container or in the emulator. Also the guest big real mode
code works like native.
The attached patch enhances KVM to use the unrestricted guest feature
if available on the processor. It also adds a new kernel/module
parameter to disable the unrestricted guest feature at the boot time.
Signed-Off-By: Nitin A Kamble <nitin.a.kamble@xxxxxxxxx>
Thanks & Regards,
Nitin
It may make sense to expose this as a CAP down to userspace.
We could possibly make better error messages in userspace when we get an
unknown vmexit failure on pre-wsm hardware.
If we see the dreaded 0x80000021 and CR0.PE=0, then we're likely seeing
a real mode emulation problem.
--
error compiling committee.c: too many arguments to function
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