linux-kernel - Re: [patch 4/7] x86/kvmclock: Cleanup the code

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Message-ID: <bc3e607c-0eaa-addf-7363-a994c99de828@redhat.com>
Date:   Mon, 9 Jul 2018 13:32:26 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Radim Krcmar <rkrcmar@...hat.com>,
        Juergen Gross <jgross@...e.com>,
        Pavel Tatashin <pasha.tatashin@...cle.com>,
        steven.sistare@...cle.com, daniel.m.jordan@...cle.com,
        x86@...nel.org, kvm@...r.kernel.org
Subject: Re: [patch 4/7] x86/kvmclock: Cleanup the code

On 09/07/2018 11:05, Peter Zijlstra wrote:
> On Fri, Jul 06, 2018 at 06:13:11PM +0200, Thomas Gleixner wrote:
>> -	native_write_msr(msr_kvm_wall_clock, low, high);
>> +	wrmsrl(msr_kvm_wall_clock, slow_virt_to_phys(&wall_clock));
> Does it matter that you went from an explicit native WRMSR instruction
> to a potentially paravirt MSR thing?

No, KVM doesn't paravirtualize wrmsr.

Paolo