xend: handle extended PCI configuration space when saving state

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]
Signed-off-by: Matt Wilson <msw@amazon.com>
master commit: 1893cf77992cc0ce9d827a8d345437fa2494b540
master date: 2013-09-03 16:36:47 +0100

diff --git a/tools/python/xen/util/pci.py b/tools/python/xen/util/pci.py
index 98bea1aeadc18c55fe45fa4a3b9705f9d98e3032..307144ce31c96c452caf64c382fb7572eb2c886f 100644 (file)
--- 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]