[SRU][F][PATCH 1/1] s390/pci: Mark all VFs as not implementing PCI_COMMAND_MEMORY

[frank.heimes at canonical.com]

From: Matthew Rosato <mjrosato at linux.ibm.com>

BugLink: https://bugs.launchpad.net/bugs/1907265

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: abafbc551fdd ("vfio-pci: Invalidate mmaps and block MMIO access on disabled memory")
Signed-off-by: Matthew Rosato <mjrosato at linux.ibm.com>
Reviewed-by: Niklas Schnelle <schnelle at linux.ibm.com>
Reviewed-by: Pierre Morel <pmorel at linux.ibm.com>
Signed-off-by: Alex Williamson <alex.williamson at redhat.com>
(cherry picked from commit 08b6e22b850c28b6032da1e4d767a33116e23dfb)
Signed-off-by: Frank Heimes <frank.heimes at canonical.com>
---
 arch/s390/pci/pci_bus.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/s390/pci/pci_bus.c b/arch/s390/pci/pci_bus.c
index 07b4b4367d69..ebcd04514e8e 100644
--- a/arch/s390/pci/pci_bus.c
+++ b/arch/s390/pci/pci_bus.c
@@ -192,9 +192,10 @@ 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)
-- 
2.25.1