Re: [Xen-devel] Question: PV ops Fedora 16 Initialises Hypercall Page Twice?

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2012-03-22 at 14:51 +0000, John McDermott CIV wrote:
> Xen Developers,
> 
> I noticed that my PV ops guests cause the hypervisor to invoke
> hypercall_page_initialise twice from traps.c (i.e. through
> wrmsr_hypervisor_regs), for different hypercall_page addresses.
> Looking at the code, I see hvmloader.c causing one of those, in its
> main. I read the HVM Loader Xen wiki page, Googled, spelunked the
> source, etc. but cannot find where / why the other hypercall page is
> being requested. Is the other hypercall page being initialized by
> qemu-dm and the hvmloader page is discarded?

The second one will be your guest Linux kernel, which I guess has PVHVM
enabled, setting up its hypercall page.

Ian.



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