Re: [Xen-devel] [PATCH v4] VT-d PI: disable VT-d PI when CPU-side PI isn't enabled

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

> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
> Sent: Thursday, August 3, 2017 5:44 PM
> 
> >>> On 13.06.17 at 10:29, <JBeulich@xxxxxxxx> wrote:
> >>>> On 13.06.17 at 10:20, <chao.gao@xxxxxxxxx> wrote:
> >> From the context calling pi_desc_init(), we can conclude the current
> >> implementation of VT-d PI depends on CPU-side PI. If we enable VT-d PI
> >> and disable CPU-side PI by disabling APICv explicitly in xen boot
> >> command line, we would get an assertion failure.
> >>
> >> This patch clears iommu_intpost once finding CPU-side PI won't be
> enabled.
> >> It is safe for this is done before this flag starts taking effect. Also
> >> take this chance to remove the useless check of "acknowledge interrupt
> on
> >> exit", which is a minimal requirement which has been checked earlier.
> >>
> >> Signed-off-by: Chao Gao <chao.gao@xxxxxxxxx>
> 
> Kevin, Jun?
> 

thanks for remind.

Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>

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