On 27/04/2016 07:05, Wei Chen wrote:
Hi Julien,
Hi Wei,
On 26 April 2016 at 18:49, Julien Grall <[email protected]> wrote:
On 25/04/2016 10:39, Wei Chen wrote:
+ d->domain_id);
+ return ret;
+ }
+
+ /*
+ * Map all SPIs that are allocated to MSIs for the frame to the
+ * domain.
+ */
+ for ( spi = v2m_data->spi_start;
+ spi < (v2m_data->spi_start + v2m_data->nr_spis); spi++ )
+ {
+ /*
+ * MSIs are always edge-triggered. Configure the associated
SPIs
+ * to be edge-rising.
How did you find that SPIs should be configured edge-rising?
Before route_irq_to_guest, the SPI must be configured. I found Linux
v2m driver set
the SPI type to edge-rising, so I set edge-rising as v2m SPI default
type here too.
Well, Linux did it for a good reason (i.e based on a spec). We are
trying in Xen to document piece of code which may not be
straight-forward to deduce.
In this case, the IRQ is configured edge-rising because this is the only
edge type supported by SPIs. I would expand the second sentence of the
comment to explain that.
Regards,
--
Julien Grall
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