Re: [Xen-devel] Re: HVM hypercalls

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2011-05-23 at 08:48 +0100, veeruyours wrote:
> Hi,
> 
> I recently started working on XEN, and I am looking for ways to invoke
> hypercalls from HVM.
> I followed your instructions and succeeded in reading MSR register.
> But when i attempt to write the physical address of a 4K page from my HVM
> guest (2.6.30 kernel), i observed the XEN hypervisor reporting it as bad
> GMFN as follows.
> 
> [root@f13 ~]# xm dmesg -c
> (XEN) traps.c:664:d17 Bad GMFN ffff88001e925 (MFN ffffffffffffffff) to MSR
> 40000000

That supposed GMFN (fff88001e925) looks an awful lot like a virtual
address and not a physical one to me, unless your guest really has >4TB
of RAM assigned...

> 
> Could you please help me in understanding what went wrong in my
> implementation.
> 
> I am running XEN 4.0.1 on AMD 64bit machine with svm support and the dom0
> kernel running 2.6.32.39.
> 
> The 
> Thanks & Regards,
> VSR.
> 
> 
> --
> View this message in context: 
> http://xen.1045712.n5.nabble.com/HVM-hypercalls-tp2541346p4418332.html
> Sent from the Xen - Dev mailing list archive at Nabble.com.
> 
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