Commit 08b6e22b authored Sep 10, 2020 by Matthew Rosato Committed by Alex Williamson Sep 22, 2020

s390/pci: Mark all VFs as not implementing PCI_COMMAND_MEMORY

For s390 we can have VFs that are passed-through without the associated
PF. Firmware provides an emulation layer to allow these devices to
operate independently, but is missing emulation of the Memory Space
Enable bit. For these as well as linked VFs, set no_command_memory
which specifies these devices do not implement PCI_COMMAND_MEMORY.

Fixes: abafbc55 ("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>

parent 12856e7a

arch/s390/pci/pci_bus.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -197,9 +197,10 @@ void pcibios_bus_add_device(struct pci_dev *pdev)
		* With pdev->no_vf_scan the common PCI probing code does not
		* perform PF/VF linking.
		*/
		if (zdev->vfn)
		if (zdev->vfn) {
		zpci_bus_setup_virtfn(zdev->zbus, pdev, zdev->vfn);

		pdev->no_command_memory = 1;
		}
		}

		static int zpci_bus_add_device(struct zpci_bus zbus, struct zpci_dev zdev)

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