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

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> 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>

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