From b4b549d6ab0d43ca16d492aa1b6ac75a0f880942 Mon Sep 17 00:00:00 2001
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Date: Fri, 5 May 2017 19:06:14 +0200
Subject: usb-xhci: Fix PCI capability order

RH-Author: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-id: <20170505190614.15987-2-dgilbert@redhat.com>
Patchwork-id: 75038
O-Subject: [RHEL-7.4 qemu-kvm-rhev PATCH 1/1] usb-xhci: Fix PCI capability order
Bugzilla: 1447874
RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
RH-Acked-by: Michael S. Tsirkin <mst@redhat.com>
RH-Acked-by: Gerd Hoffmann <kraxel@redhat.com>
RH-Acked-by: Juan Quintela <quintela@redhat.com>

From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>

Upstream commit 1108b2f8a9 in 2.7.0 changed the order
of the PCI capability chain in the XHCI pci device in the case
where the device has the PCIe endpoint capability (i.e. only
older machine types, pc-i440fx-2.0 upstream, pc-i440fx-rhel7.0.0
apparently for us).

Changing the order breaks migration compatibility; fixing this
upstream would mean breaking the same case going from 2.7.0->current
that currently works 2.7.0->2.9.0 - so upstream it's a choice
of two breakages.

Since we never released 2.7.0/2.8.0 we can fix this downstream.

This reverts the order so that we create the capabilities in the
order:
   PCIe
   MSI
   MSI-X

The symptom is:
qemu-kvm: get_pci_config_device: Bad config data: i=0x71 read: a0 device: 0 cmask: ff wmask: 0 w1cmask:0
qemu-kvm: Failed to load PCIDevice:config
qemu-kvm: Failed to load xhci:parent_obj
qemu-kvm: error while loading state for instance 0x0 of device '0000:00:0d.0/xhci'
qemu-kvm: load of migration failed: Invalid argument

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>

--
Rebase notes (2.9.0):
- Change in assert condition (upstream)

(cherry picked from commit aad727a5ecde1ad4935eb8427604d4df5a1f1f35)
(cherry picked from commit 2dd7402227e77d748a7375233ac9e7feab244bda)

Conflicts:
	hw/usb/hcd-xhci.c

(cherry picked from commit a42f86dc906cc7d2c16d02bf125ed76847b469cb)
(cherry picked from commit 992ab2e4f6e15d3e51bc716763aa8d6f45c6d29d)
---
 hw/usb/hcd-xhci.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
index 883141f..181e803 100644
--- a/hw/usb/hcd-xhci.c
+++ b/hw/usb/hcd-xhci.c
@@ -3368,6 +3368,12 @@ static void usb_xhci_realize(struct PCIDevice *dev, Error **errp)
         xhci->max_pstreams_mask = 0;
     }
 
+    if (pci_bus_is_express(pci_get_bus(dev)) ||
+        xhci_get_flag(xhci, XHCI_FLAG_FORCE_PCIE_ENDCAP)) {
+        ret = pcie_endpoint_cap_init(dev, 0xa0);
+        assert(ret > 0);
+    }
+
     if (xhci->msi != ON_OFF_AUTO_OFF) {
         ret = msi_init(dev, 0x70, xhci->numintrs, true, false, &err);
         /* Any error other than -ENOTSUP(board's MSI support is broken)
@@ -3416,12 +3422,6 @@ static void usb_xhci_realize(struct PCIDevice *dev, Error **errp)
                      PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64,
                      &xhci->mem);
 
-    if (pci_bus_is_express(pci_get_bus(dev)) ||
-        xhci_get_flag(xhci, XHCI_FLAG_FORCE_PCIE_ENDCAP)) {
-        ret = pcie_endpoint_cap_init(dev, 0xa0);
-        assert(ret > 0);
-    }
-
     if (xhci->msix != ON_OFF_AUTO_OFF) {
         /* TODO check for errors, and should fail when msix=on */
         msix_init(dev, xhci->numintrs,
-- 
1.8.3.1