From: Juergen Gross <jgross@suse.com>
To: xen-devel@lists.xenproject.org, linux-pm@vger.kernel.org,
linux-kernel@vger.kernel.org, x86@kernel.org
Cc: Juergen Gross <jgross@suse.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Len Brown <len.brown@intel.com>, Pavel Machek <pavel@ucw.cz>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
stable@vger.kernel.org,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Stefano Stabellini <sstabellini@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>
Subject: [PATCH 0/2] xen: fix illegal rtc device usage of pv guests
Date: Fri, 3 Sep 2021 10:49:35 +0200 [thread overview]
Message-ID: <20210903084937.19392-1-jgross@suse.com> (raw)
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(+)
--
2.26.2
next reply other threads:[~2021-09-03 8:49 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-03 8:49 Juergen Gross [this message]
2021-09-03 8:49 ` [PATCH 1/2] PM: base: power: don't try to use non-existing RTC for storing data Juergen Gross
2021-09-03 8:56 ` Greg Kroah-Hartman
2021-09-03 9:01 ` Juergen Gross
2021-09-03 9:08 ` Greg Kroah-Hartman
2021-09-06 17:07 ` Rafael J. Wysocki
2021-09-06 17:07 ` Rafael J. Wysocki
2021-09-07 4:18 ` Juergen Gross
2021-09-03 8:49 ` [PATCH 2/2] xen: reset legacy rtc flag for PV domU Juergen Gross
2021-09-08 14:54 ` Boris Ostrovsky
2021-09-10 7:27 ` Juergen Gross
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