linux-kernel - [PATCH v3 0/2] Check enumeration before MSR save/restore

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Message-Id: <cover.1668539735.git.pawan.kumar.gupta@linux.intel.com>
Date:   Tue, 15 Nov 2022 11:17:04 -0800
From:   Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
To:     Andrew Cooper <Andrew.Cooper3@...rix.com>, thomas.lendacky@....com,
        "H. Peter Anvin" <hpa@...or.com>, hdegoede@...hat.com,
        Ingo Molnar <mingo@...hat.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
        Pavel Machek <pavel@....cz>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        David.Kaplan@....com, Borislav Petkov <bp@...en8.de>
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 v3 0/2] Check enumeration before MSR save/restore

v3:
- Rebased to latest upstream.
- Made MSR_AMD64_DE_CFG restore depend on X86_FEATURE_LFENCE_RDTSC.

v2: https://lore.kernel.org/lkml/cover.1668455932.git.pawan.kumar.gupta@linux.intel.com/
- Dropped patch for X86_FEATURE_AMD64_LS_CFG, using X86_FEATURE_AMD64_LS_CFG_SSBD instead.
- Commit message updated.

v1: https://lore.kernel.org/lkml/cover.1663025154.git.pawan.kumar.gupta@linux.intel.com/

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/

Thanks,
Pawan

Pawan Gupta (2):
  x86/tsx: Add feature bit for TSX control MSR support
  x86/pm: Add enumeration check before spec MSRs save/restore setup

 arch/x86/include/asm/cpufeatures.h |  1 +
 arch/x86/kernel/cpu/tsx.c          | 30 +++++++++++++++---------------
 arch/x86/power/cpu.c               | 25 +++++++++++++++++--------
 3 files changed, 33 insertions(+), 23 deletions(-)

-- 
2.37.3