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Re: [Xen-devel] Legacy PIC (x86) support (RTC) in dom0 with Linux 4.12 and newer is broken for some hardware.



CC: Juergen Gross

On 04/12/18 17:24, Jennifer Herbert wrote:
Since Linux 4.12, there has been a 
commita1e23a42f1bdc00e32fc4869caef12e4e6272f26

“rtc: cmos: Do not assume irq 8 for rtc when there are no legacy irqs”

The commit effectively disabled requesting IRQ 8 for systems without PIC

controller present (As in the case when used at dom0 under Xen) and at

the same time where this IRQ is not explicitly described in ACPI tables.

I have found hardware without this IRQ in the ACPI tables, and indeed,

found the RTC to be broken in dom 0.  Temporarily, I reverted this

commit, which fixed the problem, but I was wondering if anyone here

knew of a better solution?

Cheers,

-jenny



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