[Xen-devel] Re: [PATCH] VT-d: Hardware require RH bit to be set in IRTE when delivery mode is LPR

[Sheng Yang <sheng@xxxxxxxxxxxxxxx>]

On Thursday 26 August 2010 17:24:40 Keir Fraser wrote:
> On 26/08/2010 10:17, "Sheng Yang" <sheng@xxxxxxxxxxxxxxx> wrote:
> > +    /* Hardware require RH = 1 for LPR delivery mode */
> > +    if ( new_ire.lo.dlm == dest_LowestPrio )
> > +        new_ire.lo.rh = 1;
> > +    else
> > +        new_ire.lo.rh = 0;
> 
> The form 'if ( p ) x = 1; else x = 0;' is better written as 'x = (p)'.
> Please re-submit in that style.
> 
>  -- Keir

Updated, thanks.

--
regards
Yang, Sheng

--
diff --git a/xen/drivers/passthrough/vtd/intremap.c 
b/xen/drivers/passthrough/vtd/intremap.c
--- a/xen/drivers/passthrough/vtd/intremap.c
+++ b/xen/drivers/passthrough/vtd/intremap.c
@@ -320,9 +320,10 @@
         *(((u32 *)&new_rte) + 0) = value;
         new_ire.lo.fpd = 0;
         new_ire.lo.dm = new_rte.dest_mode;
-        new_ire.lo.rh = 0;
         new_ire.lo.tm = new_rte.trigger;
         new_ire.lo.dlm = new_rte.delivery_mode;
+        /* Hardware require RH = 1 for LPR delivery mode */
+        new_ire.lo.rh = (new_ire.lo.dlm == dest_LowestPrio);
         new_ire.lo.avail = 0;
         new_ire.lo.res_1 = 0;
         new_ire.lo.vector = new_rte.vector;
@@ -632,9 +633,10 @@
     /* Set interrupt remapping table entry */
     new_ire.lo.fpd = 0;
     new_ire.lo.dm = (msg->address_lo >> MSI_ADDR_DESTMODE_SHIFT) & 0x1;
-    new_ire.lo.rh = 0;
     new_ire.lo.tm = (msg->data >> MSI_DATA_TRIGGER_SHIFT) & 0x1;
     new_ire.lo.dlm = (msg->data >> MSI_DATA_DELIVERY_MODE_SHIFT) & 0x1;
+    /* Hardware require RH = 1 for LPR delivery mode */
+    new_ire.lo.rh = (new_ire.lo.dlm == dest_LowestPrio);
     new_ire.lo.avail = 0;
     new_ire.lo.res_1 = 0;
     new_ire.lo.vector = (msg->data >> MSI_DATA_VECTOR_SHIFT) &

Attachment: rh_fix.patch
Description: Text Data

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