From: Keir Fraser <keir.fraser@citrix.com>
Date: Thu, 26 Aug 2010 10:16:56 +0000 (+0100)
Subject: VT-d: Hardware require RH bit to be set in IRTE when delivery mode is LPR
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~11569
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=8de22c95b4ed0503fd8545704a34f542befd4e70;p=xen.git

VT-d: Hardware require RH bit to be set in IRTE when delivery mode is LPR

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
---

diff --git a/xen/drivers/passthrough/vtd/intremap.c b/xen/drivers/passthrough/vtd/intremap.c
index 2ad4a9b088..1ac7e52316 100644
--- a/xen/drivers/passthrough/vtd/intremap.c
+++ b/xen/drivers/passthrough/vtd/intremap.c
@@ -320,9 +320,10 @@ static int ioapic_rte_to_remap_entry(struct iommu *iommu,
         *(((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 @@ static int msi_msg_to_remap_entry(
     /* 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) &