This is a note to let you know that I've just added the patch titled
PCI/IOV: Mark VFs as not implementing PCI_COMMAND_MEMORY
to the 5.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
pci-iov-mark-vfs-as-not-implementing-pci_command_mem.patch
and it can be found in the queue-5.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit dcd6883c94c4aace7ac0bbce6b971910f9e1469d
Author: Matthew Rosato <mjrosato@xxxxxxxxxxxxx>
Date: Thu Sep 10 10:59:55 2020 -0400
PCI/IOV: Mark VFs as not implementing PCI_COMMAND_MEMORY
[ 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@xxxxxxxxxxxxx>
Acked-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index b37e08c4f9d1a..4afd4ee4f7f04 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -180,6 +180,7 @@ 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 34c1c4f45288f..1bc3c020672fd 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -439,6 +439,7 @@ 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 */
