| commit | c2077e2ca0da75b6b97e2485a41b8168e2a387c2 | |
| author | Alex Williamson <alex.williamson@redhat.com> | |
| Mon, 18 Jan 2016 23:06:03 +0000 (18 16:06 -0700) | ||
| committer | Michael S. Tsirkin <mst@redhat.com> | |
| Thu, 20 Dec 2018 16:25:36 +0000 (20 11:25 -0500) | ||
| tree | 17861c7c23b58919a45094647ffc727d943e83e5 | treesnapshot (tar.gz zip) |
| parent | 27c1da512994b34912dbb8d12982045da1450e65 | commitdiff |
pci: Adjust PCI config limit based on bus topology
A conventional PCI bus does not support config space accesses above
the standard 256 byte configuration space. PCIe-to-PCI bridges are
not permitted to forward transactions if the extended register address
field is non-zero and must handle it as an unsupported request (PCIe
bridge spec rev 1.0, 4.1.3, 4.1.4). Therefore, we should not support
extended config space if there is a conventional bus anywhere on the
path to a device.
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Marcel Apfelbaum <marcel@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
A conventional PCI bus does not support config space accesses above
the standard 256 byte configuration space. PCIe-to-PCI bridges are
not permitted to forward transactions if the extended register address
field is non-zero and must handle it as an unsupported request (PCIe
bridge spec rev 1.0, 4.1.3, 4.1.4). Therefore, we should not support
extended config space if there is a conventional bus anywhere on the
path to a device.
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Marcel Apfelbaum <marcel@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
| hw/pci/pci_host.c | diffblobblamehistory |