On 07.01.2009, at 11:07, Avi Kivity wrote:
Alexander Graf wrote:
Current AMD CPUs support masking of CPUID bits. Using this
functionality,
a VMM can limit what features are exposed to the guest, even if
it's not
using SVM/VMX.
While I'm not aware of any open source hypervisor that uses these
MSRs
atm, VMware ESX does and patches exist for Xen, where trapping
CPUID is
non-trivial.
This patch implements emulation for this masking, which is pretty
trivial
because we're intercepting CPUID anyways.
Because it's so simple and can be pretty effective, I put it into the
generic code paths, so VMX benefits from it as well.
Missing save/restore support.
Right. I keep forgetting about that one ;-).
Note that Intel has similar functionality, called FlexMigration
IIRC, likely using different MSRs.
Hum. I'll take a look at it to see if that's as easy to implement then.
Alex
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