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Re: [Xen-devel] is HYPERVISOR_console_io implemented for HVM domains?
| To: | James Harper <james.harper@xxxxxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] is HYPERVISOR_console_io implemented for HVM domains? |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Wed, 26 Sep 2007 13:49:47 +0100 |
| Delivery-date: | Wed, 26 Sep 2007 05:52:54 -0700 |
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| Thread-index: | AcgAOg9JdZf6fG7+Q26ZerviPgOPewAAai05 |
| Thread-topic: | [Xen-devel] is HYPERVISOR_console_io implemented for HVM domains? |
| User-agent: | Microsoft-Entourage/11.3.6.070618 |
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
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
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