From: Matthew Rosato mjrosato@linux.ibm.com
[ Upstream commit 12856e7acde4702b7c3238c15fcba86ff6aa507f ]
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: abafbc551fdd ("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 --- drivers/pci/iov.c | 1 + include/linux/pci.h | 1 + 2 files changed, 2 insertions(+)
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index 9c116cbaa95d8..e15220385666f 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -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); diff --git a/include/linux/pci.h b/include/linux/pci.h index e92bd9b32f369..6a6a819c5b49b 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -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 */