linux-kernel - Re: [PATCH RFC 0/2] KVM: x86: Support using the VMX preemption timer for APIC Timer periodic/oneshot mode

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Message-ID: <CALCETrV+FzPOnZV3bTXAYzQQkTJAmea2RA7ig3FsoZW=6KSqBA@mail.gmail.com>
Date:   Tue, 11 Jul 2017 07:40:50 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     Wanpeng Li <kernellwp@...il.com>
Cc:     Andy Lutomirski <luto@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        kvm <kvm@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>,
        X86 ML <x86@...nel.org>, Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Yunhong Jiang <yunhong.jiang@...el.com>,
        Wanpeng Li <wanpeng.li@...mail.com>
Subject: Re: [PATCH RFC 0/2] KVM: x86: Support using the VMX preemption timer
 for APIC Timer periodic/oneshot mode

On Mon, Jul 10, 2017 at 7:43 PM, Wanpeng Li <kernellwp@...il.com> wrote:
>
> Sigh, I heard the same idea from a company called Huawei, they applied
> the patent for the idea.

Seriously?  What arseholes.

Also, calling that an invention is a bit of a joke.  It's called the
VMX *preemption* timer.  Using it for preemption isn't exactly rocket
science.  Neither is passing an MSR straight through.

That being said, the lack of scaling and offset support is indeed problematic.