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| author | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2016-02-11 16:10:23 -0500 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2016-03-07 12:26:52 -0500 |
| commit | a7b4133de42f7eb7a926e1a5a1aaf0c1e7bfad12 (patch) | |
| tree | ffbfb8f5cfac2333c60187bb75e06675f8e04183 | |
| parent | fda3e3e7b638f742149fb32aa9b691413bb91f41 (diff) | |
| download | lwn-a7b4133de42f7eb7a926e1a5a1aaf0c1e7bfad12.tar.gz lwn-a7b4133de42f7eb7a926e1a5a1aaf0c1e7bfad12.zip | |
xen/pciback: Check PF instead of VF for PCI_COMMAND_MEMORY
[ Upstream commit d52a24819677bbb45eb1ce93a42daa1ae6c4d61d ]
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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
| -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 7d858ff958ed..9cf4653b6bd7 100644 --- a/drivers/xen/xen-pciback/pciback_ops.c +++ b/drivers/xen/xen-pciback/pciback_ops.c @@ -212,8 +212,9 @@ 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; |