> To sum up : > - Xen needs the _PAGE_IOMAP flag set on the vm_page_prot for the > device to work. > - I understand the proper way to do this is to set the VM_IO flag, > and then call vm_get_page_prot() > > > There are quite a few drivers under drivers/infiniband/hw that call > > io_remap_pfn_range() -- presumably they all need the analogous fix? > > I only have access to Mellanox Infinihost HBAs for testing, but once
There is another way, which I hope can fix this issue (it fixes the graphics drivers). Basically making the Xen MMU be aware of the E820 and consider any access to PFNs that are not in RAM to have VM_IO implicitly set. The patches are at git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git stable/p2m-identity.v4.3 And posted on LKML )https://lkml.org/lkml/2010/12/30/163) They _should_ take care of your problem as long as the PFNs you are mapping fall within the PCI BAR regions (which I would presume they do since you are using ioremap). Please tell me if they work (or not). -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
