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[Xen-devel] [PATCH] [IOMMU] interrupt remapping fix
| To: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx>, Xen Developers <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] [PATCH] [IOMMU] interrupt remapping fix |
| From: | "Zhai, Edwin" <edwin.zhai@xxxxxxxxx> |
| Date: | Fri, 23 Oct 2009 14:01:38 +0800 |
| Cc: | "Zhai, Edwin" <edwin.zhai@xxxxxxxxx> |
| Delivery-date: | Thu, 22 Oct 2009 23:04:43 -0700 |
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Fix the error of translation from int remapping table entry(IRTE) to MSI msg. This error may write wrong IRTE back to the VTd hardware, and block physical interrupts. Signed-Off-By: Zhai Edwin <edwin.zhai@xxxxxxxxx> -- best rgds, edwin Index: xen-dev/xen/drivers/passthrough/vtd/intremap.c
===================================================================
--- xen-dev.orig/xen/drivers/passthrough/vtd/intremap.c
+++ xen-dev/xen/drivers/passthrough/vtd/intremap.c
@@ -468,8 +468,12 @@ static int remap_entry_to_msi_msg(
MSI_ADDR_DESTMODE_LOGIC) |
((iremap_entry->lo.dlm != dest_LowestPrio) ?
MSI_ADDR_REDIRECTION_CPU:
- MSI_ADDR_REDIRECTION_LOWPRI) |
- iremap_entry->lo.dst >> 8;
+ MSI_ADDR_REDIRECTION_LOWPRI);
+ if ( x2apic_enabled )
+ msg->dest32 = iremap_entry->lo.dst;
+ else
+ msg->address_lo |=
+ ((iremap_entry->lo.dst >> 8) & 0xff ) << MSI_ADDR_DEST_ID_SHIFT;
msg->data =
MSI_DATA_TRIGGER_EDGE |
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