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From:   Juergen Gross <jgross@suse.com>
To:     linux-kernel@vger.kernel.org, x86@kernel.org,
        linux-doc@vger.kernel.org
Cc:     Juergen Gross <jgross@suse.com>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        "H. Peter Anvin" <hpa@zytor.com>, xen-devel@lists.xenproject.org,
        Jonathan Corbet <corbet@lwn.net>
Subject: [PATCH v2 0/3] xen/pv: sanitize xen pv guest msr accesses
Date:   Tue,  4 Oct 2022 10:43:32 +0200
Message-Id: <20221004084335.2838-1-jgross@suse.com>
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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.

Juergen Gross (3):
  xen/pv: allow pmu msr accesses to cause GP
  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                            | 61 ++++++------
 4 files changed, 118 insertions(+), 57 deletions(-)

-- 
2.35.3