How to recognize which guest issues the hypercall?

How to recognize which guest issues the hypercall?

[Big Strong]

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I write a program to intercept all hypercalls happend on a xen hypervisor.
How can I know which domain called the hypercall? Is it possible to obtain
it from the registers?

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Re: How to recognize which guest issues the hypercall?

[George Dunlap]

On Wed, Nov 25, 2015 at 7:18 AM, Big Strong <fangtuo90@gmail.com> wrote:
> I write a program to intercept all hypercalls happend on a xen hypervisor.
> How can I know which domain called the hypercall? Is it possible to obtain
> it from the registers?

Why are you cross-posting this to both xen-users and xen-devel?  This
is obviously a development question.

At any given time, "current" will point to the vcpu struct of the
currently-running vcpu; current->domain will point to the domain
struct.  That should get you started.

 -George

Re: How to recognize which guest issues the hypercall?

[Big Strong]

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Thanks for your replying and sorry for the behavior. Can I get that using
libxc? Because I can't access the structure directly from dom0.

2015-11-25 18:44 GMT+08:00 George Dunlap <dunlapg@umich.edu>:

> On Wed, Nov 25, 2015 at 7:18 AM, Big Strong <fangtuo90@gmail.com> wrote:
> > I write a program to intercept all hypercalls happend on a xen
> hypervisor.
> > How can I know which domain called the hypercall? Is it possible to
> obtain
> > it from the registers?
>
> Why are you cross-posting this to both xen-users and xen-devel?  This
> is obviously a development question.
>
> At any given time, "current" will point to the vcpu struct of the
> currently-running vcpu; current->domain will point to the domain
> struct.  That should get you started.
>
>  -George
>

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Re: How to recognize which guest issues the hypercall?

[George Dunlap]

On Wed, Nov 25, 2015 at 1:23 PM, Big Strong <fangtuo90@gmail.com> wrote:
> Thanks for your replying and sorry for the behavior. Can I get that using
> libxc? Because I can't access the structure directly from dom0.

Also, please don't top-post. :-)

Hypercalls are made from the guest to the hypervisor; it's in the
hypervisor that "current" is available.

 -George