Re: [Xen-devel] [PATCH v8 3/7] VMX: Make sure PI is in proper state before install the hooks

["Wu, Feng" <feng.wu@xxxxxxxxx>]

> -----Original Message-----
> From: Tian, Kevin
> Sent: Friday, November 18, 2016 12:11 PM
> To: Wu, Feng <feng.wu@xxxxxxxxx>; xen-devel@xxxxxxxxxxxxx
> Cc: jbeulich@xxxxxxxx; andrew.cooper3@xxxxxxxxxx;
> george.dunlap@xxxxxxxxxxxxx; dario.faggioli@xxxxxxxxxx
> Subject: RE: [PATCH v8 3/7] VMX: Make sure PI is in proper state before 
> install
> the hooks
> 
> > From: Wu, Feng
> > Sent: Friday, November 18, 2016 9:57 AM
> >
> > We may hit the last ASSERT() in vmx_vcpu_block in the current code,
> > since vmx_vcpu_block() may get called before vmx_pi_switch_to()
> > has been installed or executed. Here We use cmpxchg to update
> > the NDST field, this can make sure we only update the NDST when
> > vmx_pi_switch_to() has not been called. So the NDST is in a
> > proper state in vmx_vcpu_block().
> >
> > Suggested-by: Jan Beulich <JBeulich@xxxxxxxx>
> > Signed-off-by: Feng Wu <feng.wu@xxxxxxxxx>
> > Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
> 
> Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>

Thanks for the Ack!

Thanks,
Feng

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