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Re: [Xen-devel] [PATCH] x86: Xen PV guests don't have the rtc_cmos platform device

On 12/09/2015 10:00 AM, Sander Eikelenboom wrote:
On 2015-12-09 15:42, Jan Beulich wrote:
On 09.12.15 at 15:32, <boris.ostrovsky@xxxxxxxxxx> wrote:
--- a/arch/x86/kernel/rtc.c
+++ b/arch/x86/kernel/rtc.c
@@ -200,6 +200,9 @@ static __init int add_rtc_cmos(void)

+    if (paravirt_enabled())
+        return -ENODEV;

What about Xen Dom0?


Checked that in my testing and that still worked:
[   16.733837] rtc_cmos 00:02: RTC can wake from S4
[   16.734030] rtc_cmos 00:02: rtc core: registered rtc_cmos as rtc0
[ 16.734087] rtc_cmos 00:02: alarms up to one month, y3k, 114 bytes nvram [ 17.760329] rtc_cmos 00:02: setting system clock to 2015-12-09 08:43:48 UTC (1449650628)

and /dev/rtc and /dev/rtc0 both exist.

But i don't know the nitty gritty details about why ...

That's because it is discovered by ACPI earlier. I don't know though whether we can always assume this will be the case.


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