[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Re: [PATCH] infiniband/mthca : Fix userland mapping of mthca infiniband cards in Xen dom0
> 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). _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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