From: Eric Auger Date: Fri, 15 Feb 2019 16:16:06 +0000 (+0100) Subject: vfio_pci: Enable memory accesses before calling pci_map_rom X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=0cfd027be1d6def4a462cdc180c055143af24069;p=openwrt%2Fstaging%2Fblogic.git vfio_pci: Enable memory accesses before calling pci_map_rom pci_map_rom/pci_get_rom_size() performs memory access in the ROM. In case the Memory Space accesses were disabled, readw() is likely to trigger a synchronous external abort on some platforms. In case memory accesses were disabled, re-enable them before the call and disable them back again just after. Fixes: 89e1f7d4c66d ("vfio: Add PCI device driver") Signed-off-by: Eric Auger Suggested-by: Alex Williamson Signed-off-by: Alex Williamson --- diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c index 84b593b9fb1f..a25659b5a5d1 100644 --- a/drivers/vfio/pci/vfio_pci.c +++ b/drivers/vfio/pci/vfio_pci.c @@ -759,6 +759,7 @@ static long vfio_pci_ioctl(void *device_data, { void __iomem *io; size_t size; + u16 orig_cmd; info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); info.flags = 0; @@ -774,15 +775,23 @@ static long vfio_pci_ioctl(void *device_data, break; } - /* Is it really there? */ + /* + * Is it really there? Enable memory decode for + * implicit access in pci_map_rom(). + */ + pci_read_config_word(pdev, PCI_COMMAND, &orig_cmd); + pci_write_config_word(pdev, PCI_COMMAND, + orig_cmd | PCI_COMMAND_MEMORY); + io = pci_map_rom(pdev, &size); - if (!io || !size) { + if (io) { + info.flags = VFIO_REGION_INFO_FLAG_READ; + pci_unmap_rom(pdev, io); + } else { info.size = 0; - break; } - pci_unmap_rom(pdev, io); - info.flags = VFIO_REGION_INFO_FLAG_READ; + pci_write_config_word(pdev, PCI_COMMAND, orig_cmd); break; } case VFIO_PCI_VGA_REGION_INDEX: