[Xen-devel] [PULL for-2.10 1/7] hw/xen: Set emu_mask for igd_opregion register

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

From: Xiong Zhang <xiong.y.zhang@xxxxxxxxx>

In igd passthrough environment, guest could only access opregion at the
first bootup time. Once guest shutdown, later guest couldn't access
opregion anymore.
This is because qemu set emulated guest opregion base address to host
register. Later guest get a wrong host opregion base address, and couldn't
access it anymore.

This patch set emu_mask for igd_opregion register, so guest won't set
guest opregion base address to host.

Signed-off-by: Xiong Zhang <xiong.y.zhang@xxxxxxxxx>
Acked-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
Signed-off-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
 hw/xen/xen_pt_config_init.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/xen/xen_pt_config_init.c b/hw/xen/xen_pt_config_init.c
index 6f18366..1f04ec5 100644
--- a/hw/xen/xen_pt_config_init.c
+++ b/hw/xen/xen_pt_config_init.c
@@ -1535,6 +1535,7 @@ static XenPTRegInfo xen_pt_emu_reg_igd_opregion[] = {
         .offset     = 0x0,
         .size       = 4,
         .init_val   = 0,
+        .emu_mask   = 0xFFFFFFFF,
         .u.dw.read   = xen_pt_intel_opregion_read,
         .u.dw.write  = xen_pt_intel_opregion_write,
     },
-- 
1.9.1


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