On 9/22/2016 10:26 PM, Jan Beulich wrote:
But please also answer the earlier question, which you did strip
>> from your reply:
>>> Which btw raises another question: Why are you in polling mode in
>>> the first place? Do you have a UART without working interrupt?
> I found there was no interrupt with Xen ns16550 dirver while
> linux kernel's serial driver can receive interrupt.
And do you know the reason? Is it perhaps a PCI plug in card, and
you don't specify the IRQ on the command line? Or the kernel
doesn't provide the necessary information (from ACPI) for Xen to
set up that IRQ?

No, I am not familiar serial device. But it's a ACPI device from linux
sysfs node and serial drivers use irq 4 for their interrupt both on
linux and Xen.

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