[Qemu-devel] [PULL 19/53] hw/acpi: fix Q35 support for legacy Windows OS

["Michael S. Tsirkin" <mst@redhat.com>]

From: Marcel Apfelbaum <marcel@redhat.com>

Legacy Windows operating systems like Windows XP and Windows 2003
require _DIS method to be present for all interrupt links.

PC machines already have a no-op implemented for GSI links, add
it also in Q35.

Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
---
 hw/i386/acpi-build.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index dbd0b93..0e32395 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -1556,6 +1556,12 @@ static Aml *build_gsi_link_dev(const char *name, uint8_t uid, uint8_t gsi)
 
     aml_append(dev, aml_name_decl("_CRS", crs));
 
+    /*
+     * _DIS can be no-op because the interrupt cannot be disabled.
+     */
+    method = aml_method("_DIS", 0, AML_NOTSERIALIZED);
+    aml_append(dev, method);
+
     method = aml_method("_SRS", 1, AML_NOTSERIALIZED);
     aml_append(dev, method);
 
-- 
MST