Re: [Xen-devel] [PATCH v4 2/3] VT-d: Reduce spin timeout to 1ms, which can be boot-time changed.

["Xu, Quan" <quan.xu@xxxxxxxxx>]

On 14.01.2016 at 12:58am, <JBeulich@xxxxxxxx> wrote:
> >>> On 23.12.15 at 09:25, <quan.xu@xxxxxxxxx> wrote:
> > --- a/xen/drivers/passthrough/vtd/qinval.c
> > +++ b/xen/drivers/passthrough/vtd/qinval.c
> > @@ -28,6 +28,11 @@
> >  #include "vtd.h"
> >  #include "extern.h"
> >
> > +static int __read_mostly iommu_qi_timeout_ms = 1;
> > +integer_param("iommu_qi_timeout_ms", iommu_qi_timeout_ms);
> 
> But wait - this needs to be accompanied by an entry in
> docs/misc/xen-command-line.markdown.
> 

Jan, Is the following right?

--- a/docs/misc/xen-command-line.markdown
+++ b/docs/misc/xen-command-line.markdown
@@ -901,6 +901,14 @@ debug hypervisor only).

 >> Control the use of Queued Invalidation.

+> `qi_timeout_ms` (VT-d)
+
+> Default: `1`
+
+> `= <integer>`
+
+>> Specify the timeout of the VT-d Queued Invalidation in ms.
+
 > `snoop` (Intel)

 > Default: `true`


-Quan

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