vfio/pci: Decouple PCI_COMMAND_MEMORY bit checks from is_virtfn

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While it is true that devices with is_virtfn=1 will have a Memory Space
Enable bit that is hard-wired to 0, this is not the only case where we
see this behavior -- For example some bare-metal hypervisors lack
Memory Space Enable bit emulation for devices not setting is_virtfn
(s390). Fix this by instead checking for the newly-added
no_command_memory bit which directly denotes the need for
PCI_COMMAND_MEMORY emulation in vfio.

Fixes: abafbc551f ("vfio-pci: Invalidate mmaps and block MMIO access on disabled memory")
Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Niklas Schnelle <schnelle@linux.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

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Matthew Rosato 2020-09-10 10:59:57 -04:00 • committed by Alex Williamson

parent 08b6e22b85

commit 515ecd5368

1 changed files with 14 additions and 10 deletions

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drivers/vfio/pci/vfio_pci_config.c

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