[PATCH] xend: handle extended PCI configuration space when saving state

[Matt Wilson <msw@linux.com>]

From: Steven Noonan <snoonan@amazon.com>

Newer PCI standards (e.g., PCI-X 2.0 and PCIe) introduce extended
configuration space which is larger than 256 bytes. This patch uses
stat() to determine the amount of space used to correctly save all of
the PCI configuration space. Resets handled by the xen-pciback driver
don't have this problem, as that code correctly handles saving
extended configuration space.

Signed-off-by: Steven Noonan <snoonan@amazon.com>
Reviewed-by: Matt Wilson <msw@amazon.com>
[msw: adjusted commit message]
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Matt Wilson <msw@amazon.com>
---
 tools/python/xen/util/pci.py |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/python/xen/util/pci.py b/tools/python/xen/util/pci.py
index 792fb69..adeca4b 100644
--- a/tools/python/xen/util/pci.py
+++ b/tools/python/xen/util/pci.py
@@ -521,8 +521,9 @@ def save_pci_conf_space(devs_string):
         pci_path = sysfs_mnt + SYSFS_PCI_DEVS_PATH + '/' + pci_str + \
                 SYSFS_PCI_DEV_CONFIG_PATH
         fd = os.open(pci_path, os.O_RDONLY)
+        size = os.fstat(fd).st_size
         configs = []
-        for i in range(0, 256, 4):
+        for i in range(0, size, 4):
             configs = configs + [os.read(fd,4)]
         os.close(fd)
         pci_list = pci_list + [pci_path]
-- 
1.7.9.5