At 2015-03-05 19:09:41, "Tim Deegan" <t...@xen.org> wrote: >Hi, > >At 10:54 +0800 on 05 Mar (1425549262), openlui wrote: >> 2. From the trace info and qemu-dm's log, it seems that it is "GPA" >> (Guest Physical Address) instead of "MFN" in the IOREQ's data field >> received by qemu-dm: > >Yes. Thanks for your reply.
>> I think qemu-dm/rtl8139 should read/write data from "MFN" address in >> host memory instaed of GPA, and I find that there isn't hypercall >> from dom0 to "translate" the gpa to mfn in subsequent xentrace >> info. Is my understanding is wrong? I would really appreciate your >> help. > >The hypercall that qemu uses to map the guest's memory for reading and >writing also takes a GFN/GPA. So Qemu doesn't need to know what the >actual MFN is -- it just does all its operations in GPAs and Xen takes >care of the translations. Could you give some hint about the type of hypercall qemu used to map the guest's memory? I know that there are some xc_map_foreign_xxx interfaces in libxc which can do the similar work. However, it seems that these interfaces should be given MFN instead of GFN/GPA. >Cheers, > >Tim. > >_______________________________________________ >Xen-devel mailing list >Xen-devel@lists.xen.org >http://lists.xen.org/xen-devel
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