Re: [Xen-devel] I have used printk in some hypercall.But Dom0 can't be booted.

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

On Sat, Mar 31, 2012 at 2:15 PM, SuperWong <wang_nets@xxxxxxx> wrote:
> Hi all:
>    I wanted to record some information about some hypercalls and trace the
> hypercalls.So I have tried to add printk in the hypercall.But the Dom0 can't
> be *booted*.For example, I add printk at the beginning of do_set_trap_table.
> printk("<1>""HYPERCALL:do_set_trap_table");
> Why I can't add printk in hypercall?
> Does anyone know the reason and the solution?Thanks.

There's no way we can answer this question without the output of the
dom0 saying why it failed.

The best way to do this is to set up a serial console:
 http://wiki.xen.org/wiki/Xen_Serial_Console

 -George

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