Author: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Fri Jan 10 14:31:36 2025 +0100
Linux 6.6.71
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Author: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Fri Jan 10 13:09:11 2025 +0100
Revert "x86, crash: wrap crash dumping code into crash related ifdefs"
This reverts commit e5b1574a8ca28c40cf53eda43f6c3b016ed41e27 which is
commit a4eeb2176d89fdf2785851521577b94b31690a60 upstream.
When this change is backported to the 6.6.y tree, it can cause build
errors on some configurations when KEXEC is not enabled, so revert it
for now.
Reported-by: Ignat Korchagin <ignat@cloudflare.com>
Link: https://lore.kernel.org/r/3DB3A6D3-0D3A-4682-B4FA-407B2D3263B2@cloudflare.com
Reported-by: Lars Wendler <wendler.lars@web.de>
Link: https://lore.kernel.org/r/20250110103328.0e3906a8@chagall.paradoxon.rec
Reported-by: Chris Clayton <chris2553@googlemail.com>
Link: https://lore.kernel.org/r/10c7be00-b1f8-4389-801b-fb2d0b22468d@googlemail.com
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Dexuan Cui <decui@microsoft.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Hari Bathini <hbathini@linux.ibm.com>
Cc: Klara Modin <klarasmodin@gmail.com>
Cc: Michael Kelley <mhklinux@outlook.com>
Cc: Michael Kelley <mhklinux@outlook.com>
Cc: Naman Jain <namjain@linux.microsoft.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Pingfan Liu <piliu@redhat.com>
Cc: Sasha Levin <sashal@kernel.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Wei Liu <wei.liu@kernel.org>
Cc: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Author: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Fri Jan 10 13:06:34 2025 +0100
Revert "x86/hyperv: Fix hv tsc page based sched_clock for hibernation"
This reverts commit 6681113633dc738ec95fe33104843a1e25acef3b which is
commit bcc80dec91ee745b3d66f3e48f0ec2efdea97149 upstream.
The dependant patch before this one caused build errors in the 6.6.y
tree, so revert this for now so that we can fix them up properly.
Reported-by: Ignat Korchagin <ignat@cloudflare.com>
Link: https://lore.kernel.org/r/3DB3A6D3-0D3A-4682-B4FA-407B2D3263B2@cloudflare.com
Reported-by: Lars Wendler <wendler.lars@web.de>
Link: https://lore.kernel.org/r/20250110103328.0e3906a8@chagall.paradoxon.rec
Reported-by: Chris Clayton <chris2553@googlemail.com>
Link: https://lore.kernel.org/r/10c7be00-b1f8-4389-801b-fb2d0b22468d@googlemail.com
Cc: Dexuan Cui <decui@microsoft.com>
Cc: Naman Jain <namjain@linux.microsoft.com>
Cc: Michael Kelley <mhklinux@outlook.com>
Cc: Wei Liu <wei.liu@kernel.org>
Cc: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Author: Naman Jain <namjain@linux.microsoft.com>
Date: Tue Sep 17 11:09:17 2024 +0530
x86/hyperv: Fix hv tsc page based sched_clock for hibernation
commit bcc80dec91ee745b3d66f3e48f0ec2efdea97149 upstream.
read_hv_sched_clock_tsc() assumes that the Hyper-V clock counter is
bigger than the variable hv_sched_clock_offset, which is cached during
early boot, but depending on the timing this assumption may be false
when a hibernated VM starts again (the clock counter starts from 0
again) and is resuming back (Note: hv_init_tsc_clocksource() is not
called during hibernation/resume); consequently,
read_hv_sched_clock_tsc() may return a negative integer (which is
interpreted as a huge positive integer since the return type is u64)
and new kernel messages are prefixed with huge timestamps before
read_hv_sched_clock_tsc() grows big enough (which typically takes
several seconds).
Fix the issue by saving the Hyper-V clock counter just before the
suspend, and using it to correct the hv_sched_clock_offset in
resume. This makes hv tsc page based sched_clock continuous and ensures
that post resume, it starts from where it left off during suspend.
Override x86_platform.save_sched_clock_state and
x86_platform.restore_sched_clock_state routines to correct this as soon
as possible.
Note: if Invariant TSC is available, the issue doesn't happen because
1) we don't register read_hv_sched_clock_tsc() for sched clock:
See commit e5313f1c5404 ("clocksource/drivers/hyper-v: Rework
clocksource and sched clock setup");
2) the common x86 code adjusts TSC similarly: see
__restore_processor_state() -> tsc_verify_tsc_adjust(true) and
x86_platform.restore_sched_clock_state().
Cc: stable@vger.kernel.org
Fixes: 1349401ff1aa ("clocksource/drivers/hyper-v: Suspend/resume Hyper-V clocksource for hibernation")
Co-developed-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: Naman Jain <namjain@linux.microsoft.com>
Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Link: https://lore.kernel.org/r/20240917053917.76787-1-namjain@linux.microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Message-ID: <20240917053917.76787-1-namjain@linux.microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>