Mailing List Archive

commit 7f6daabd70ff94b7465798dcadb71e79562db2b2
Author: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Date: Wed Jan 5 23:14:37 2011 +0000

qemu-xen: support PV on HVM MSIX remapping

Support PV on HVM MSIX remapping

The technique is the same used with MSI: if the guest enables an MSIX
passing 0 as vector number, then read the address and use it as pirq
number for the following mapping request to Xen.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
hw/pt-msi.c | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/hw/pt-msi.c b/hw/pt-msi.c
index f0fb3e3..b01744e 100644
--- a/hw/pt-msi.c
+++ b/hw/pt-msi.c
@@ -300,6 +300,14 @@ static int pt_msix_update_one(struct pt_dev *dev, int entry_nr)
if ( !entry->flags )
return 0;

+ if (!gvec) {
+ /* if gvec is 0, the guest is asking for a particular pirq that
+ * is passed as dest_id */
+ pirq = ((gaddr >> 32) & 0xffffff00) |
+ (((gaddr & 0xffffffff) >> MSI_TARGET_CPU_SHIFT) & 0xff);
+ PT_LOG("pt_msix_update_one requested pirq = %d\n", pirq);
+ }
+
/* Check if this entry is already mapped */
if ( entry->pirq == -1 )
{
--
generated by git-patchbot for /home/xen/git/qemu-xen-unstable.git

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