[Qemu-devel] [PULL 17/31] pcie: Fast PCIe root ports for new machines

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

From: Alex Williamson <alex.williamson@redhat.com>

Change the default speed and width for new machine types to the
fastest and widest currently supported.  This should be compatible to
the PCIe 4.0 spec.  Pre-QEMU-4.0 machine types remain at 2.5GT/s, x1
width.

Cc: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 include/hw/compat.h                | 10 +++++++++-
 hw/pci-bridge/gen_pcie_root_port.c |  4 ++--
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/include/hw/compat.h b/include/hw/compat.h
index 70958328fe..3ca85b037c 100644
--- a/include/hw/compat.h
+++ b/include/hw/compat.h
@@ -2,7 +2,15 @@
 #define HW_COMPAT_H
 
 #define HW_COMPAT_3_1 \
-    /* empty */
+    {\
+        .driver   = "pcie-root-port",\
+        .property = "x-speed",\
+        .value    = "2_5",\
+    },{\
+        .driver   = "pcie-root-port",\
+        .property = "x-width",\
+        .value    = "1",\
+    },
 
 #define HW_COMPAT_3_0 \
     /* empty */
diff --git a/hw/pci-bridge/gen_pcie_root_port.c b/hw/pci-bridge/gen_pcie_root_port.c
index ca5418a89d..9766edb445 100644
--- a/hw/pci-bridge/gen_pcie_root_port.c
+++ b/hw/pci-bridge/gen_pcie_root_port.c
@@ -125,9 +125,9 @@ static Property gen_rp_props[] = {
     DEFINE_PROP_SIZE("pref64-reserve", GenPCIERootPort,
                      res_reserve.mem_pref_64, -1),
     DEFINE_PROP_PCIE_LINK_SPEED("x-speed", PCIESlot,
-                                speed, PCIE_LINK_SPEED_2_5),
+                                speed, PCIE_LINK_SPEED_16),
     DEFINE_PROP_PCIE_LINK_WIDTH("x-width", PCIESlot,
-                                width, PCIE_LINK_WIDTH_1),
+                                width, PCIE_LINK_WIDTH_32),
     DEFINE_PROP_END_OF_LIST()
 };
 
-- 
MST