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Re: [Xen-devel] Physical address mapping to user space in dom0 problem
| To: | Haw-Yuan Yang <hawyuan@xxxxxxxxx>, Keir Fraser <keir@xxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Physical address mapping to user space in dom0 problem |
| From: | Keir Fraser <keir@xxxxxxxxxxxxx> |
| Date: | Sun, 18 Mar 2007 08:59:13 +0000 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Sun, 18 Mar 2007 01:57:24 -0700 |
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| Thread-topic: | [Xen-devel] Physical address mapping to user space in dom0 problem |
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On 17/3/07 21:52, "Haw-Yuan Yang" <hawyuan@xxxxxxxxx> wrote: I knew that pci_alloc_consistent() will return both kernel virtual address and physical address. If I pass the physical address (dma_handler) to mmap, it return -1. However if I pass the kernel virtual address to mmap, I got a pointer point to the worng memory. Oh, I see the problem. You can only mmap() MMIO regions using /dev/mem when running on Xen. Could your device (which you already implement ioctl() for) also implement mmap() itself? Then you can simply remap_pfn_range(virt_to_phys(cpu-ptr-returned-by-pci-alloc-consistent)). This would be a neater interface to userspace for your device anyway, imo. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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