[Xen-devel] Question about XEN Hypervisor MSR capability exposion to VMs

[Liuyingdong <liuyingdong@xxxxxxxxxx>]

Hi All

We encountered a blue screen problem when live migrate
Win8.1/Win2012R2 64bit VM from V3 processor to non-V3
processor sandbox, KVM does not has this problem.

After looking into the MSR capabilities, we found XEN
hypervisor exposed bit 39 and bit 18 to the VM, from
Intel manual bit 39 refers to reserve bit and should
not be set, bit 18 refers to MWAIT/MONITOR capability,
from my understanding it should not exposed to the VM
too.
BTW, KVM does not expose bit 18/39 to the VM.

Below is the boot message:
(XEN) read msr: ecx=c0000083, msr_value=0xfffff80028ddf240
(XEN) read msr: ecx=1a0, msr_value=0x4000801889
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
(XEN) write msr:msr=40000071, msr_value=0x10000000000082f
(XEN) write msr:msr=40000070, msr_value=0x0
(XEN) write msr:msr=40000071, msr_value=0x20000000000082f
(XEN) write msr:msr=40000070, msr_value=0x0
(XEN) read msr: ecx=17, msr_value=0x0
(XEN) write msr:msr=8b, msr_value=0x0
(XEN) read msr: ecx=8b, msr_value=0x2d00000000


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