linux-kernel - [PATCH 0/3] Check enumeration before MSR save/restore

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Date:   Mon, 12 Sep 2022 16:38:44 -0700
From:   Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Pavel Machek <pavel@....cz>,
        Andrew Cooper <Andrew.Cooper3@...rix.com>, degoede@...hat.com
Cc:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        Daniel Sneddon <daniel.sneddon@...ux.intel.com>,
        antonio.gomez.iglesias@...ux.intel.com
Subject: [PATCH 0/3] Check enumeration before MSR save/restore

Hi,

This patchset is to fix the "unchecked MSR access error" [1] during S3
resume. Patch 1/3 adds a feature bit for MSR_IA32_TSX_CTRL.

Patch 2/3 adds a feature bit for MSR_AMD64_LS_CFG.

Patch 3/3 adds check for feature bit before adding any speculation
control MSR to the list of MSRs to save/restore.

[1] https://lore.kernel.org/lkml/20220906201743.436091-1-hdegoede@redhat.com/

Pawan Gupta (3):
  x86/tsx: Add feature bit for TSX control MSR support
  x86/cpu/amd: Add feature bit for MSR_AMD64_LS_CFG enumeration
  x86/pm: Add enumeration check before spec MSRs save/restore setup

 arch/x86/include/asm/cpufeatures.h |  2 ++
 arch/x86/kernel/cpu/amd.c          |  3 +++
 arch/x86/kernel/cpu/tsx.c          | 30 +++++++++++++++---------------
 arch/x86/power/cpu.c               | 23 ++++++++++++++++-------
 4 files changed, 36 insertions(+), 22 deletions(-)


base-commit: 80e78fcce86de0288793a0ef0f6acf37656ee4cf
-- 
2.37.2