qemu/include/hw/pci
David Gibson 2f57db8a27 pcie: Simplify pci_adjust_config_limit()
Since c2077e2c "pci: Adjust PCI config limit based on bus topology",
pci_adjust_config_limit() has been used in the config space read and write
paths to only permit access to extended config space on buses which permit
it.  Specifically it prevents access on devices below a vanilla-PCI bus via
some combination of bridges, even if both the host bridge and the device
itself are PCI-E.

It accomplishes this with a somewhat complex call up the chain of bridges
to see if any of them prohibit extended config space access.  This is
overly complex, since we can always know if the bus will support such
access at the point it is constructed.

This patch simplifies the test by using a flag in the PCIBus instance
indicating whether extended configuration space is accessible.  It is
false for vanilla PCI buses.  For PCI-E buses, it is true for root
buses and equal to the parent bus's's capability otherwise.

For the special case of sPAPR's paravirtualized PCI root bus, which
acts mostly like vanilla PCI, but does allow extended config space
access, we override the default value of the flag from the host bridge
code.

This should cause no behavioural change.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Greg Kurz <groug@kaod.org>
Message-Id: <20190513061939.3464-4-david@gibson.dropbear.id.au>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2019-05-29 18:00:57 -04:00
..
msi.h pci/msi: export msi_is_masked() 2019-02-05 10:58:33 -05:00
msix.h pci: msix: move 'MSIX_CAP_LENGTH' to header file 2019-05-22 17:35:27 +02:00
pci_bridge.h pci/shpc: perform unplug via the hotplug handler 2018-12-20 11:19:12 -05:00
pci_bus.h pcie: Simplify pci_adjust_config_limit() 2019-05-29 18:00:57 -04:00
pci_host.h pci: Fold host_buses list into PCIHostState functionality 2013-07-07 23:10:57 +03:00
pci_ids.h pci: Move NVIDIA vendor id to the rest of ids 2019-02-22 10:51:31 -05:00
pci_regs.h pci: Introduce define for PM capability version 1.1 2016-06-02 10:42:09 +08:00
pci.h pcie: Simplify pci_adjust_config_limit() 2019-05-29 18:00:57 -04:00
pcie_aer.h pci: Reduce scope of error injection 2017-05-08 20:32:14 +02:00
pcie_host.h ppc4xx: Add device models found in PPC440 core SoCs 2018-02-16 14:06:07 +11:00
pcie_port.h gen_pcie_root_port: Add ACS (Access Control Services) capability 2019-03-12 22:31:21 -04:00
pcie_regs.h pcie: Add a simple PCIe ACS (Access Control Services) helper function 2019-03-12 22:31:21 -04:00
pcie.h pcie: Add a simple PCIe ACS (Access Control Services) helper function 2019-03-12 22:31:21 -04:00
shpc.h pci/shpc: perform unplug via the hotplug handler 2018-12-20 11:19:12 -05:00
slotid_cap.h pci: Convert shpc_init() to Error 2017-07-03 22:29:49 +03:00