linux-kernel - [PATCH v2 0/2] Fix MSR access errors during kexec in root partition

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Message-Id: <20221027095729.1676394-1-anrayabh@linux.microsoft.com>
Date:   Thu, 27 Oct 2022 15:27:27 +0530
From:   Anirudh Rayabharam <anrayabh@...ux.microsoft.com>
To:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        wei.liu@...nel.org, decui@...rosoft.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        x86@...nel.org, hpa@...or.com, daniel.lezcano@...aro.org,
        Arnd Bergmann <arnd@...db.de>, linux-hyperv@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Cc:     stanislav.kinsburskiy@...il.com,
        Anirudh Rayabharam <anrayabh@...ux.microsoft.com>,
        kumarpraveen@...ux.microsoft.com, mail@...rudhrb.com
Subject: [PATCH v2 0/2] Fix MSR access errors during kexec in root partition

Fixes a couple of MSR access errors seen during kexec in root partition
and opportunistically introduces a data structure for the reference TSC
MSR in order to simplify the code that updates that MSR.

New in v2:
1. Reverse the patch order as suggested by Michael. First introduce the
   new structure for reference tsc MSR and then use it in the hv_cleanup
   fix.
2. Use hv_{get,set}_register functions in hv_cleanup().

Anirudh Rayabharam (2):
  clocksource/drivers/hyperv: add data structure for reference TSC MSR
  x86/hyperv: fix invalid writes to MSRs during root partition kexec

 arch/x86/hyperv/hv_init.c          | 11 +++++++----
 drivers/clocksource/hyperv_timer.c | 28 ++++++++++++++--------------
 include/asm-generic/hyperv-tlfs.h  |  9 +++++++++
 3 files changed, 30 insertions(+), 18 deletions(-)

-- 
2.34.1