linux-kernel - [PATCH v3 0/4] xen/pv: sanitize xen pv guest msr accesses

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Date:   Wed,  5 Oct 2022 13:02:58 +0200
From:   Juergen Gross <jgross@...e.com>
To:     linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-doc@...r.kernel.org
Cc:     Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, xen-devel@...ts.xenproject.org,
        Jonathan Corbet <corbet@....net>
Subject: [PATCH v3 0/4] xen/pv: sanitize xen pv guest msr accesses

Historically when running as Xen PV guest all MSR accesses have been
silently swallowing any GP faults, even when the kernel was using not
the *msr_safe() access functions.

Change that by making the behavior controllable via kernel config and
via a boot parameter.

This will help finding paths where MSRs are being accessed under Xen
which are not emulated by the hypervisor.

Changes in V3:
- new patch 2
- addressed comments

Juergen Gross (4):
  xen/pv: add fault recovery control to pmu msr accesses
  xen/pv: fix vendor checks for pmu emulation
  xen/pv: refactor msr access functions to support safe and unsafe
    accesses
  xen/pv: support selecting safe/unsafe msr accesses

 .../admin-guide/kernel-parameters.txt         |  6 ++
 arch/x86/xen/Kconfig                          |  9 ++
 arch/x86/xen/enlighten_pv.c                   | 99 +++++++++++++------
 arch/x86/xen/pmu.c                            | 71 +++++++------
 4 files changed, 127 insertions(+), 58 deletions(-)

-- 
2.35.3