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

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Message-ID: <BYAPR21MB1688DBC9CA80E03BDC7643E2D7309@BYAPR21MB1688.namprd21.prod.outlook.com>
Date:   Wed, 26 Oct 2022 14:57:58 +0000
From:   "Michael Kelley (LINUX)" <mikelley@...rosoft.com>
To:     Anirudh Rayabharam <anrayabh@...ux.microsoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        Dexuan Cui <decui@...rosoft.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>, "hpa@...or.com" <hpa@...or.com>,
        "daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>
CC:     "kumarpraveen@...ux.microsoft.com" <kumarpraveen@...ux.microsoft.com>,
        "mail@...rudhrb.com" <mail@...rudhrb.com>
Subject: RE: [PATCH 0/2] Fix MSR access errors during kexec in root partition

From: Anirudh Rayabharam <anrayabh@...ux.microsoft.com> Sent: Wednesday, October 26, 2022 6:47 AM
> 
> 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.
> 
> Anirudh Rayabharam (2):
>   x86/hyperv: fix invalid writes to MSRs during root partition kexec
>   clocksource/drivers/hyperv: add data structure for reference TSC MSR

Could these two patches be sequenced in the opposite order, to avoid the
need to change the TSC code in hyperv_cleanup() twice?  The new
data structure for the Reference TSC MSR and clocksource driver changes
would be in the first patch.  Then the second patch would update
hyperv_cleanup() and could use the new data structure.

Michael

> 
>  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