linux-kernel - Re: [PATCH 3/5] x86/kvm: Convert some slow-path static_cpu_has() callers to boot_cpu

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Date:   Mon, 1 Apr 2019 09:33:52 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Nadav Amit <nadav.amit@...il.com>,
        Andy Lutomirski <luto@...capital.net>,
        Peter Zijlstra <peterz@...radead.org>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        Radim Krčmář <rkrcmar@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org
Subject: Re: [PATCH 3/5] x86/kvm: Convert some slow-path static_cpu_has()
 callers to boot_cpu_has()

On Mon, Apr 01, 2019 at 09:24:06AM +0200, Paolo Bonzini wrote:
> The MSR reads and writes are not done in the common case.  Also, you
> cannot really expect boot_cpu_data to be in L1 in these functions since
> they run after the guest---or if they do, each L1 line you fill in with
> host data is one line you "steal" from the guest.

Ok, fair enough. I'll drop this patch.

-- 
Regards/Gruss,
    Boris.

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