Xen devel - Dec 2008 - where is hypercall page initialized?

Hi men,

I am trying to find the course of creating a DomU, beginning from ''xm
create''.
But Xm and Xend are too complex for me too follow exactly,  I am blocked 
at the question: where is the hypercall-page initialized.

At Xen 3.3.0, do the DomUs share a same hypercall-page, or each DomU owns one?

* If the former case is right, where is the hypercall-page mapped to
DomU''s address space?

* If the later case is right, where is the hypercall-page initilized for each
DomU?
In this case, I found that :
======tools/libxc/xc_dom_core.c, line 558:
  dom->parms.virt_hypercall = UNSET_ADDR;  // -1
------------
tools/libxc/xc_dom_boot.c, line 32:
  if ( dom->parms.virt_hypercall == -1 )
    return 0;
  /* The following will initilize the hypercall-page by HYPERVISOR_domctl_op. */
======So I think this case must not used now. Am I right?

Thanks,
Wu


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every domain has its own hypercall page. See hypercall_page_initialise in Xen.
For PV domain, it's control panel to issue hypercall
XEN_DOMCTL_hypercall_init for domain. For HVM domain, it's platform-pci
driver to wrmsr with special index to trigger this action.

Thanks,
Kevin

________________________________
From: xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Wu Bingzheng
Sent: Monday, December 29, 2008 11:12 AM
To: xen-devel@lists.xensource.com
Subject: [Xen-devel] where is hypercall page initialized?

Hi men,

I am trying to find the course of creating a DomU, beginning from 'xm
create'.
But Xm and Xend are too complex for me too follow exactly,  I am blocked
at the question: where is the hypercall-page initialized.

At Xen 3.3.0, do the DomUs share a same hypercall-page, or each DomU owns one?

* If the former case is right, where is the hypercall-page mapped to DomU's
address space?

* If the later case is right, where is the hypercall-page initilized for each
DomU?
In this case, I found that :
======tools/libxc/xc_dom_corec, line 558:
  dom->parms.virt_hypercall = UNSET_ADDR;  // -1
------------
tools/libxc/xc_dom_boot.c, line 32:
  if ( dom->parms.virt_hypercall == -1 )
    return 0;
  /* The following will initilize the hypercall-page by HYPERVISOR_domctl_op. */
======So I think this case must not used now. Am I right?

Thanks,
Wu


________________________________
[广告] 2008年最受关注楼盘<http://popme.163.com/link/003985_1010_7027.html>


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Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel

Thanks very much. 

I found the hypercall_page_initialise before but didnot found where it was
called.

I have found that yesterday. Thanks all the same!

Regards,
Wu

在2008-12-31，"Tian, Kevin" <kevin.tian@intel.com> 写道：

every domain has its own hypercall page. See hypercall_page_initialise in Xen.
For PV domain, it''s control panel to issue hypercall
XEN_DOMCTL_hypercall_init for domain. For HVM domain, it''s platform-pci
driver to wrmsr with special index to trigger this action.
 
Thanks,
Kevin


From:xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Wu Bingzheng
Sent: Monday, December 29, 2008 11:12 AM
To:xen-devel@lists.xensource.com
Subject: [Xen-devel] where is hypercall page initialized?


Hi men,

I am trying to find the course of creating a DomU, beginning from ''xm
create''.
But Xm and Xend are too complex for me too follow exactly,  I am blocked 
at the question: where is the hypercall-page initialized.

At Xen 3.3.0, do the DomUs share a same hypercall-page, or each DomU owns one?

* If the former case is right, where is the hypercall-page mapped to
DomU''s address space?

* If the later case is right, where is the hypercall-page initilized for each
DomU?
In this case, I found that :
======tools/libxc/xc_dom_corec, line 558:
  dom->parms.virt_hypercall = UNSET_ADDR;  // -1
------------
tools/libxc/xc_dom_boot.c, line 32:
  if ( dom->parms.virt_hypercall == -1 )
    return 0;
  /* The following will initilize the hypercall-page by HYPERVISOR_domctl_op. */
======So I think this case must not used now. Am I right?

Thanks,
Wu




[广告] 2008年最受关注楼盘

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