This is a note to let you know that I've just added the patch titled xen/pciback: Check PF instead of VF for PCI_COMMAND_MEMORY to the 4.4-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: xen-pciback-check-pf-instead-of-vf-for-pci_command_memory.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 8d47065f7d1980dde52abb874b301054f3013602 Mon Sep 17 00:00:00 2001 From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> Date: Thu, 11 Feb 2016 16:10:23 -0500 Subject: xen/pciback: Check PF instead of VF for PCI_COMMAND_MEMORY From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> commit 8d47065f7d1980dde52abb874b301054f3013602 upstream. Commit 408fb0e5aa7fda0059db282ff58c3b2a4278baa0 (xen/pciback: Don't allow MSI-X ops if PCI_COMMAND_MEMORY is not set) prevented enabling MSI-X on passed-through virtual functions, because it checked the VF for PCI_COMMAND_MEMORY but this is not a valid bit for VFs. Instead, check the physical function for PCI_COMMAND_MEMORY. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx> Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/xen/xen-pciback/pciback_ops.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/xen/xen-pciback/pciback_ops.c +++ b/drivers/xen/xen-pciback/pciback_ops.c @@ -227,8 +227,9 @@ int xen_pcibk_enable_msix(struct xen_pci /* * PCI_COMMAND_MEMORY must be enabled, otherwise we may not be able * to access the BARs where the MSI-X entries reside. + * But VF devices are unique in which the PF needs to be checked. */ - pci_read_config_word(dev, PCI_COMMAND, &cmd); + pci_read_config_word(pci_physfn(dev), PCI_COMMAND, &cmd); if (dev->msi_enabled || !(cmd & PCI_COMMAND_MEMORY)) return -ENXIO; Patches currently in stable-queue which might be from konrad.wilk@xxxxxxxxxx are queue-4.4/xen-pciback-save-the-number-of-msi-x-entries-to-be-copied-later.patch queue-4.4/xen-pciback-check-pf-instead-of-vf-for-pci_command_memory.patch queue-4.4/xen-pcifront-fix-mysterious-crashes-when-numa-locality-information-was-extracted.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html