tree 49dbad84ac83432d9f727c41647cdcd81373d3ba
parent 817dcc5368988b023c5e1d3f1444fd370c77c6a9
author Avi Kivity <avi@redhat.com> 1349278978 +0200
committer Avi Kivity <avi@redhat.com> 1350910208 +0200

pci: honor PCI_COMMAND_MASTER

Currently we ignore PCI_COMMAND_MASTER completely: DMA succeeds even when
the bit is clear.

Honor PCI_COMMAND_MASTER by inserting a memory region into the device's
bus master address space, and tying its enable status to PCI_COMMAND_MASTER.

Tested using

  setpci -s 03 COMMAND=3

while a ping was running on a NIC in slot 3.  The kernel (Linux) detected
the stall and recovered after the command

  setpci -s 03 COMMAND=7

was issued.

Signed-off-by: Avi Kivity <avi@redhat.com>