xen: fix illegal rtc device usage of pv guests

[PATCH 0/2] xen: fix illegal rtc device usage of pv guests

Juergen Gross posted 2 patches 3 years, 2 months ago

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arch/x86/xen/enlighten_pv.c |  7 +++++++
drivers/base/power/trace.c  | 10 ++++++++++
2 files changed, 17 insertions(+)

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[PATCH 0/2] xen: fix illegal rtc device usage of pv guests

Posted by Juergen Gross 3 years, 2 months ago

A recent change in mc146818_get_time() resulted in WARN splats when
booting a Xen PV guest.

The main reason is that there is a code path resulting in accessing a
RTC device which is not present, which has been made obvious by a
call of WARN() in this case.

This small series is fixing this issue by:

- avoiding the RTC device access from drivers/base/power/trace.c in
  cast there is no legacy RTC device available
- resetting the availability flag of a legacy RTC device for Xen PV
  guests

Juergen Gross (2):
  PM: base: power: don't try to use non-existing RTC for storing data
  xen: reset legacy rtc flag for PV domU

 arch/x86/xen/enlighten_pv.c |  7 +++++++
 drivers/base/power/trace.c  | 10 ++++++++++
 2 files changed, 17 insertions(+)

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2.26.2