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 CP
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 fo
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 th
Alexander Graf wrote:
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.
It's probably easy (well supporting both might be tricky) but if you
don't have a real test case th
Alexander Graf wrote:
Well if I could take the FlexMigration design into account when putting
variables in the vcpu context, that'd be great. But I can't seem to find
it in the Intel documentation, so I'll leave it for now.
Not real documentation (tell me if you find some!), but this code shows
Avi Kivity wrote:
> Alexander Graf wrote:
>>> 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.
>
> It's probably easy (well supporting both might be tricky) but if you
On 07.01.2009, at 12:16, Andre Przywara wrote:
Alexander Graf wrote:
Well if I could take the FlexMigration design into account when
putting
variables in the vcpu context, that'd be great. But I can't seem to
find
it in the Intel documentation, so I'll leave it for now.
Not real documentat