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From 5bf64f8c7302964bd5fd208d9db9fa38ee96e0fa Mon Sep 17 00:00:00 2001
From: Alex Williamson <alex.williamson@redhat.com>
Date: Fri, 10 Apr 2015 16:33:39 +0200
Subject: [PATCH 01/14] vfio: warn if host device rom can't be read

Message-id: <20150410163339.15324.77513.stgit@gimli.home>
Patchwork-id: 64789
O-Subject: [RHEL7.2 qemu-kvm PATCH 1/8] vfio: warn if host device rom can't be read
Bugzilla: 1210503
RH-Acked-by: Thomas Huth <thuth@redhat.com>
RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
RH-Acked-by: Bandan Das <bsd@redhat.com>

From: Bandan Das <bsd@redhat.com>

Upstream: d20b43dfea1587b561aae17e4fa0f7407779d253

If the device rom can't be read, report an error to the
user. This alerts the user that the device has a bad
state that is causing rom read failure or option rom
loading has been disabled from the device boot menu
(among other reasons).

Signed-off-by: Bandan Das <bsd@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 hw/misc/vfio.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/hw/misc/vfio.c b/hw/misc/vfio.c
index 40b0923..c9dbc28 100644
--- a/hw/misc/vfio.c
+++ b/hw/misc/vfio.c
@@ -1197,6 +1197,13 @@ static void vfio_pci_load_rom(VFIODevice *vdev)
     vdev->rom_offset = reg_info.offset;
 
     if (!vdev->rom_size) {
+        error_report("vfio-pci: Cannot read device rom at "
+                    "%04x:%02x:%02x.%x\n",
+                    vdev->host.domain, vdev->host.bus, vdev->host.slot,
+                    vdev->host.function);
+        error_printf("Device option ROM contents are probably invalid "
+                    "(check dmesg).\nSkip option ROM probe with rombar=0, "
+                    "or load from file with romfile=\n");
         return;
     }
 
-- 
1.8.3.1