Re: [Xen-users] hypercall implementation

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2013-12-10 at 18:55 +0800, åäé wrote:
> But what's the content (src code) of hypercall_page?
>  How is the hypercall implemented?

You need to be looking on the hypervisor side for that. It is a page of
code which is mapped into the guest kernel and contains the necessary
instructions (int 0x82, syscall, vmcall, etc) depending on the guest
type etc. For a PV guest it is populated by the Xen tools asking the
hypervisor to do so during guest build and for a PVHVM guest it is
populated by the guest writing to a special MSR, see enlighten.c in the
Linux kernel, specifically init_hvm_pv_info().

Ian.



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