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Date:   Fri, 14 Feb 2020 09:43:13 -0800
From:   Jim Mattson <>
To:     Erwan Velu <>
Cc:     Erwan Velu <>,
        Paolo Bonzini <>,
        Sean Christopherson <>,
        Vitaly Kuznetsov <>,
        Wanpeng Li <>,
        Joerg Roedel <>,
        Thomas Gleixner <>,
        Ingo Molnar <>, Borislav Petkov <>,
        "H. Peter Anvin" <>,
        "the arch/x86 maintainers" <>,
        kvm list <>,
        LKML <>
Subject: Re: [PATCH] kvm: x86: Print "disabled by bios" only once per host

On Fri, Feb 14, 2020 at 6:33 AM Erwan Velu <> wrote:
> The current behavior is to print a "disabled by bios" message per CPU thread.
> As modern CPUs can have up to 64 cores, 128 on a dual socket, and turns this
> printk to be a pretty noisy by showing up to 256 times the same line in a row.
> This patch offer to only print the message once per host considering the BIOS will
> disabled the feature for all sockets/cores at once and not on a per core basis.

That's quite an assumption you're making. I guess I've seen more
broken BIOSes than you have. :-) Still, I would rather see the message
just once--perhaps with an additional warning if all logical
processors aren't in agreement.

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