diff options
| author |   Mohammed Hawari <mohammed@hawari.fr> | 2020-10-21 16:41:30 +0200 |
|---|---|---|
| committer |   Damjan Marion <dmarion@me.com> | 2020-10-22 15:48:14 +0000 |
| commit | 70fc36f26855fb4c7a56c5d1563d541b395f8f5d (patch) | |
| tree | 43ff9907967c3153b3965cd79b22f02ea44b315a | |
| parent | 8950c272550098c544976668a943b7a5bd05de91 (diff) | |
pci: set PCI memory enable before mapping PCI BAR
This change mitigates software faults issued by some versions of the
linux kernel vfio-pci driver when VF PCI BARs are used without setting
the memory enable bit in the PCI configuration. This problem is
mentionned in https://lkml.org/lkml/2020/6/25/628
Change-Id: Idc177be4a5adb6ee467b4dd8f055f133ff267fe1
Type: improvement
Signed-off-by: Mohammed Hawari <mohammed@hawari.fr>
| -rw-r--r-- | src/vlib/linux/pci.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/vlib/linux/pci.c b/src/vlib/linux/pci.c index 6078be2537e..1caf0c9c229 100644 --- a/src/vlib/linux/pci.c +++ b/src/vlib/linux/pci.c @@ -1134,9 +1134,21 @@ vlib_pci_map_region_int (vlib_main_t * vm, vlib_pci_dev_handle_t h, clib_error_t *error; int flags = MAP_SHARED; u64 size = 0, offset = 0; + u16 command; pci_log_debug (vm, p, "map region %u to va %p", bar, addr); + if ((error = vlib_pci_read_config_u16 (vm, h, 4, &command))) + return error; + + if (!(command & PCI_COMMAND_MEMORY)) + { + pci_log_debug (vm, p, "setting memory enable bit"); + command |= PCI_COMMAND_MEMORY; + if ((error = vlib_pci_write_config_u16 (vm, h, 4, &command))) + return error; + } + if ((error = vlib_pci_region (vm, h, bar, &fd, &size, &offset))) return error; |