On Mon, 2006-06-26 at 11:27 +0800, Tian, Kevin wrote:
> I seem to understand your proposal now. Do you mean that some early
> table will report the irq line information for the console device out of the
> ACPI table?
Hi Kevin,
Yes, the PCDP firmware table tells us all the details of the console
UART, base address, GSI, interrupt polarity/trigger, etc... So we don't
need any additional ACPI/PCI knowledge to get the UART running in
interrupt mode.
> If that's the case, I think changes required to achieve this
> purpose is:
> 1. Modify assign_irq_vector hypercall to allow passing into GSI for
> check sharing with PCI serial
> If it's sharing, return existing vector instead of a new
> allocation
> 2. Add a new flag to indicate such sharing between xen and dom0,
> and remove checks against this style in all places.
> When assertion on this irq line happens, pass to xen first and
> then to dom0
Great, this is what I was thinking too. I'll try to look into adding
this.
> 3. Do we need to hide such console from dom0, since the latter
> only uses para-virtualized xenconsole?
This is a little tricky. I think for now we'll likely use the same
CONFIG_XEN_DISABLE_SERIAL option that x86 uses to hide all the UARTs
from dom0. Ideally we could hide them dynamically to allow a
transparent VP kernel to still use a serial console. Thanks,
Alex
--
Alex Williamson HP Open Source & Linux Org.
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