When we do an FLR, or D0->D3_hot we may lose the BARs as the
device has turned itself off (and on). This means the device cannot
function unless the pci_restore_state is called - which it is
when the PCI device is unbound from the Xen PCI backend driver.
For PV guests it ends up calling pci_enable_device / pci_enable_msi[x]
which does the proper steps
That however is not happening if a HVM guest is run as QEMU
deals with PCI configuration space. QEMU also requires that the
device be "parked" under the ownership of a pci-stub driver to
guarantee that the PCI device is not being used. Hence we
follow the same incantation as pci_reset_function does - by
doing an FLR, then restoring the PCI configuration space.
The result of this patch is that when you run lspci, you get
now this:
- Region 0: [virtual] Memory at fe8c0000 (32-bit, non-prefetchable) [size=128K]
- Region 1: [virtual] Memory at fe800000 (32-bit, non-prefetchable) [size=512K]
+ Region 0: Memory at fe8c0000 (32-bit, non-prefetchable) [size=128K]
+ Region 1: Memory at fe800000 (32-bit, non-prefetchable) [size=512K]
Region 2: I/O ports at c000 [size=32]
- Region 3: [virtual] Memory at fe8e0000 (32-bit, non-prefetchable) [size=16K]
+ Region 3: Memory at fe8e0000 (32-bit, non-prefetchable) [size=16K]
The [virtual] means that lspci read those entries from SysFS but when
it read them from the device it got a different value (0xfffffff).
CC: stable@vger.kernel.org #only for 3.5, 3.6
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
c341ca45ce