linux-kernel - Re: [PATCH v8 3/5] x86/kvm: Add "nopvspin" parameter to disable PV spinlocks

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Date:   Wed, 23 Oct 2019 08:40:06 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Zhenzhong Duan <zhenzhong.duan@...cle.com>
Cc:     linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, x86@...nel.org, pbonzini@...hat.com,
        rkrcmar@...hat.com, vkuznets@...hat.com, wanpengli@...cent.com,
        jmattson@...gle.com, joro@...tes.org, boris.ostrovsky@...cle.com,
        jgross@...e.com, peterz@...radead.org, will@...nel.org,
        linux-hyperv@...r.kernel.org, kvm@...r.kernel.org,
        mikelley@...rosoft.com, kys@...rosoft.com, haiyangz@...rosoft.com,
        sthemmin@...rosoft.com, sashal@...nel.org,
        Jonathan Corbet <corbet@....net>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v8 3/5] x86/kvm: Add "nopvspin" parameter to disable PV
 spinlocks

On Wed, Oct 23, 2019 at 07:16:22PM +0800, Zhenzhong Duan wrote:
> There are cases where a guest tries to switch spinlocks to bare metal
> behavior (e.g. by setting "xen_nopvspin" on XEN platform and
> "hv_nopvspin" on HYPER_V).
> 
> That feature is missed on KVM, add a new parameter "nopvspin" to disable
> PV spinlocks for KVM guest.
> 
> The new 'nopvspin' parameter will also replace Xen and Hyper-V specific
> parameters in future patches.
> 
> Define variable nopvsin as global because it will be used in future
> patches as above.
> 
> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@...cle.com>
> Reviewed-by: Vitaly Kuznetsov <vkuznets@...hat.com>
> Cc: Jonathan Corbet <corbet@....net>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Borislav Petkov <bp@...en8.de>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> Cc: Radim Krcmar <rkrcmar@...hat.com>
> Cc: Sean Christopherson <sean.j.christopherson@...el.com>
> Cc: Vitaly Kuznetsov <vkuznets@...hat.com>
> Cc: Wanpeng Li <wanpengli@...cent.com>
> Cc: Jim Mattson <jmattson@...gle.com>
> Cc: Joerg Roedel <joro@...tes.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Will Deacon <will@...nel.org>
> ---

Reviewed-by: Sean Christopherson <sean.j.christopherson@...el.com>