linux-kernel - Re: [PATCH] x86/xen/time: set the X86_FEATURE_TSC_KNOWN_FREQ flag in xen_tsc

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Message-ID: <cd9ce52e-6026-a115-7f3e-405e45c3e20b@oracle.com>
Date:   Tue, 21 Jul 2020 19:33:44 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Hayato Ohhashi <o8@....dev>, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, x86@...nel.org
Cc:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        jgross@...e.com, sstabellini@...nel.org
Subject: Re: [PATCH] x86/xen/time: set the X86_FEATURE_TSC_KNOWN_FREQ flag in
 xen_tsc_khz()

On 7/21/20 12:12 PM, Hayato Ohhashi wrote:
> If the TSC frequency is known from the pvclock page,
> the TSC frequency does not need to be recalibrated.
> We can avoid recalibration by setting X86_FEATURE_TSC_KNOWN_FREQ.
>
> Signed-off-by: Hayato Ohhashi <o8@....dev>


Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>