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PCI/IOV: Mark VFs as not implementing PCI_COMMAND_MEMORY 

[ Upstream commit 12856e7acd ]

For VFs, the Memory Space Enable bit in the Command Register is
hard-wired to 0.

Add a new bit to signify devices where the Command Register Memory
Space Enable bit does not control the device's response to MMIO
accesses.

Fixes: abafbc551f ("vfio-pci: Invalidate mmaps and block MMIO access on disabled memory")
Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Matthew Rosato 2020-09-10 10:59:55 -04:00 committed by Greg Kroah-Hartman
parent aafa4b4c38
commit 42f16b3add
2 changed files with 2 additions and 0 deletions
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1
drivers/pci/iov.c
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@ -158,6 +158,7 @@ int pci_iov_add_virtfn(struct pci_dev *dev, int id)
virtfn->device = iov->vf_device;
virtfn->is_virtfn = 1;
virtfn->physfn = pci_dev_get(dev);
virtfn->no_command_memory = 1;
if (id == 0)
pci_read_vf_config_common(virtfn);

1
include/linux/pci.h
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@ -423,6 +423,7 @@ struct pci_dev {
unsigned int is_probed:1; /* Device probing in progress */
unsigned int link_active_reporting:1;/* Device capable of reporting link active */
unsigned int no_vf_scan:1; /* Don't scan for VFs after IOV enablement */
unsigned int no_command_memory:1; /* No PCI_COMMAND_MEMORY */
pci_dev_flags_t dev_flags;
atomic_t enable_cnt; /* pci_enable_device has been called */