linux-kernel - Re: [PATCH v3 1/4] xen/pv: add fault recovery control to pmu msr accesses

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Message-ID: <1ed567ab-6f1d-996e-66d1-da1e6b7ab8d2@suse.com>
Date:   Wed, 5 Oct 2022 13:58:41 +0200
From:   Jan Beulich <jbeulich@...e.com>
To:     Juergen Gross <jgross@...e.com>
Cc:     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,
        linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH v3 1/4] xen/pv: add fault recovery control to pmu msr
 accesses

On 05.10.2022 13:02, Juergen Gross wrote:
> Today pmu_msr_read() and pmu_msr_write() fall back to the safe variants
> of read/write MSR in case the MSR access isn't emulated via Xen. Allow
> the caller to select that faults should not be recovered from by passing
> NULL for the error pointer.
> 
> Restructure the code to make it more readable.
> 
> Signed-off-by: Juergen Gross <jgross@...e.com>

Reviewed-by: Jan Beulich <jbeulich@...e.com>