On Fri, Jul 29, 2011, Zachary Amsden wrote about Re: Nested VMX - L1 hangs on
running L2:
...
In that case, you need to distinguish between reads of the TSC MSR by
the guest and reads by the host (as done internally to track drift and
...
Unfortunately, the layering currently doesn't seem
, Jul 29, 2011, Zachary Amsden wrote about Re: Nested VMX - L1 hangs
on running L2:
...
In that case, you need to distinguish between reads of the TSC MSR by
the guest and reads by the host (as done internally to track drift and
...
Unfortunately, the layering currently doesn't seem to allow
On Sun, Jul 31, 2011, Zachary Amsden wrote about Re: Nested VMX - L1 hangs on
running L2:
This patch looks good, with one comment noted inline below. Are there
no other call sites for kvm_get_msr() or which alias some other
function to kvm_get_msr(MSR_IA32_TSC) ?
This is all I found
2011/7/27 Nadav Har'El n...@math.technion.ac.il:
On Wed, Jul 20, 2011, Zachary Amsden wrote about Re: Nested VMX - L1 hangs
on running L2:
No, both patches are wrong.
kvm_get_msr(vcpu, MSR_IA32_TSC, tsc) should always return the L1 TSC,
regardless of the setting of any MSR bitmap
On Fri, Jul 29, 2011 at 05:01:16AM -0400, Zachary Amsden wrote:
So you are right, this is still wrong for the case in which L1 does
not trap TSC MSR reads. Note however, the RDTSC instruction is still
virtualized properly, it is only the relatively rare actual TSC MSR
read via RDMSR which is
On Wed, Jul 20, 2011, Zachary Amsden wrote about Re: Nested VMX - L1 hangs on
running L2:
No, both patches are wrong.
The correct fix is to make kvm_get_msr() return the L1 guest TSC at all
times.
We are serving the L1 guest in this hypervisor, not the L2 guest, and so
should
should be.
-Matt McGill
On Jul 28, 2011, at 7:11 AM, Nadav Har'El wrote:
On Wed, Jul 20, 2011, Zachary Amsden wrote about Re: Nested VMX - L1 hangs
on running L2:
No, both patches are wrong.
The correct fix is to make kvm_get_msr() return the L1 guest TSC at all
times.
We are serving the L1
On Wed, Jul 20, 2011, Zachary Amsden wrote about Re: Nested VMX - L1 hangs on
running L2:
No, both patches are wrong.
kvm_get_msr(vcpu, MSR_IA32_TSC, tsc) should always return the L1 TSC,
regardless of the setting of any MSR bitmap. The reason why is that it
is being called by the L0
I have already discussed this a bit with Nadav but hoping someone
else has any other ideas/clues/suggestions/comments. With recent versions of
the
kernel (The last I tried is 3.0-rc5 with nVMX patches already merged), my L1
guest
always hangs when I start L2.
My setup : The host, L1 and L2
