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| author | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2016-02-11 16:10:23 -0500 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2016-03-16 10:38:22 +0100 |
| commit | 372e06155eb9a01cdff0b87c6ac4347448a5273c (patch) | |
| tree | 3bf8ed52e6363f1dd2ea8c16b7df186716caac2f | |
| parent | bb7aa305af0fd136dde25ad65ec0d3279d809d8b (diff) | |
| download | lwn-372e06155eb9a01cdff0b87c6ac4347448a5273c.tar.gz lwn-372e06155eb9a01cdff0b87c6ac4347448a5273c.zip | |
xen/pciback: Check PF instead of VF for PCI_COMMAND_MEMORY
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@oracle.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
| -rw-r--r-- | drivers/xen/xen-pciback/pciback_ops.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/xen/xen-pciback/pciback_ops.c b/drivers/xen/xen-pciback/pciback_ops.c index 1f6ee5a6f6ee..1199d147dcde 100644 --- 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_pcibk_device *pdev, /* * 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; |