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) ?
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, th
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 l
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
2011/7/27 Nadav Har'El :
> 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,
hang.
As for the correct way to fix it, I don't yet understand the VMX spec or the
possible cases well enough to know what the correct behavior 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 V
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 L
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 r
On Wed, Jul 20, 2011 at 12:52 PM, Nadav Har'El wrote:
>
> > No, both patches are wrong.
>
> Guys, thanks for looking into this bug. I'm afraid I'm still at a loss at
> why a TSC bug would even cause a guest lockup :(
>
> When Avi Kivity saw my nested TSC handling code he remarked "this is
> probab
On 0, Nadav Har'El wrote:
> > No, both patches are wrong.
>
> Guys, thanks for looking into this bug. I'm afraid I'm still at a loss at
> why a TSC bug would even cause a guest lockup :(
>
> When Avi Kivity saw my nested TSC handling code he remarked "this is
> probably wrong". When I asked him
> No, both patches are wrong.
Guys, thanks for looking into this bug. I'm afraid I'm still at a loss at
why a TSC bug would even cause a guest lockup :(
When Avi Kivity saw my nested TSC handling code he remarked "this is
probably wrong". When I asked him where it was wrong, he basically said
tha
On Wed, Jul 20, 2011 at 06:19:19PM +0200, Jan Kiszka wrote:
> On 2011-07-20 18:12, Marcelo Tosatti wrote:
> > On Wed, Jul 20, 2011 at 09:58:47AM +0200, Jan Kiszka wrote:
> >> On 2011-07-18 20:26, Marcelo Tosatti wrote:
> >>>
> >>> On Fri, Jul 08, 2011 at 02:40:53PM -0400, Bandan Das wrote:
> I
On 2011-07-20 18:12, Marcelo Tosatti wrote:
> On Wed, Jul 20, 2011 at 09:58:47AM +0200, Jan Kiszka wrote:
>> On 2011-07-18 20:26, Marcelo Tosatti wrote:
>>>
>>> On Fri, Jul 08, 2011 at 02:40:53PM -0400, Bandan Das wrote:
I have already discussed this a bit with Nadav but hoping someone
e
On Wed, Jul 20, 2011 at 09:58:47AM +0200, Jan Kiszka wrote:
> On 2011-07-18 20:26, Marcelo Tosatti wrote:
> >
> > On Fri, Jul 08, 2011 at 02:40:53PM -0400, Bandan Das wrote:
> >> I have already discussed this a bit with Nadav but hoping someone
> >> else has any other ideas/clues/suggestions/comm
On 2011-07-18 20:26, Marcelo Tosatti wrote:
>
> On Fri, Jul 08, 2011 at 02:40:53PM -0400, Bandan Das wrote:
>> 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
On 0, Marcelo Tosatti wrote:
>
> On Fri, Jul 08, 2011 at 02:40:53PM -0400, Bandan Das wrote:
> > 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 w
On Fri, Jul 08, 2011 at 02:40:53PM -0400, Bandan Das wrote:
> 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
>
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 a
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