Re: [Xen-devel] is HYPERVISOR_console_io implemented for HVM domains?

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

Only a few hypercalls are allowed to be executed in an HVM guest.
Console_io() is, in any case, only really for use by dom0.

If you want to get debug output, you can send bytes to I/O port 0xe9. See
tools/firmware/hvmloader/ directory for a printf() example.

 -- Keir

On 26/9/07 13:37, "James Harper" <james.harper@xxxxxxxxxxxxxxxx> wrote:

> When I do HYPERVISOR_console_io from windows
> ('HYPERVISOR_console_io(CONSOLEIO_write, 12, "hello world!");'), 'xm
> dmesg' says:
> 
> "
> (XEN) hvm.c:756:d78 HVM vcpu 78:0 bad hypercall 18.
> "
> 
> 78 is the DomID of my Windows DomU... so either I'm not passing the
> parameters correctly, or console_io is not (any longer?) functional...
> xen is 3.1.0.
> 
> Any suggestions?
> 
> Thanks
> 
> James
> 
> 
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