linux-kernel - Re: [PATCH v8 0/5] Add a unified parameter "nopvspin"

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Date:   Tue, 29 Oct 2019 09:33:27 +0800
From:   Zhenzhong Duan <zhenzhong.duan@...cle.com>
To:     linux-kernel@...r.kernel.org, tglx@...utronix.de,
        pbonzini@...hat.com
Cc:     mingo@...hat.com, bp@...en8.de, x86@...nel.org, rkrcmar@...hat.com,
        sean.j.christopherson@...el.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
Subject: Re: [PATCH v8 0/5] Add a unified parameter "nopvspin"

Hi Baolo, Thomas

This patchset is reviewed pass and keep silent for a while, will anyone 
of you

consider to pick it up? Thanks

Zhenzhong

On 2019/10/23 19:16, Zhenzhong Duan wrote:
> There are cases folks want to disable spinlock optimization for
> debug/test purpose. Xen and hyperv already have parameters "xen_nopvspin"
> and "hv_nopvspin" to support that, but kvm doesn't.
>
> The first patch adds that feature to KVM guest with "nopvspin".
>
> For compatibility reason original parameters "xen_nopvspin" and
> "hv_nopvspin" are retained and marked obsolete.
>
> v8:
> PATCH2: use 'kvm-guest' instead of 'kvm_guest'        [Sean Christopherson]
> PATCH3: add a comment to explain missed 'return'      [Sean Christopherson]
>
> v7:
> PATCH3: update comment and use goto, add RB              [Vitaly Kuznetsov]
>
> v6:
> PATCH1: add Reviewed-by                                  [Vitaly Kuznetsov]
> PATCH2: change 'pv' to 'PV', add Reviewed-by             [Vitaly Kuznetsov]
> PATCH3: refactor 'if' branch in kvm_spinlock_init()      [Vitaly Kuznetsov]
>
> v5:
> PATCH1: new patch to revert a currently unnecessory commit,
>          code is simpler a bit after that change.         [Boris Ostrovsky]
> PATCH3: fold 'if' statement,add comments on virt_spin_lock_key,
>          reorder with PATCH2 to better reflect dependency
> PATCH4: fold 'if' statement, add Reviewed-by             [Boris Ostrovsky]
> PATCH5: add Reviewed-by                                  [Michael Kelley]
>
> v4:
> PATCH1: use variable name nopvspin instead of pvspin and
>          defined it as __initdata, changed print message,
>          updated patch description                     [Sean Christopherson]
> PATCH2: remove Suggested-by, use "kvm-guest:" prefix  [Sean Christopherson]
> PATCH3: make variable nopvsin and xen_pvspin coexist
>          remove Reviewed-by due to code change         [Sean Christopherson]
> PATCH4: make variable nopvsin and hv_pvspin coexist   [Sean Christopherson]
>
> v3:
> PATCH2: Fix indentation
>
> v2:
> PATCH1: pick the print code change into separate PATCH2,
>          updated patch description             [Vitaly Kuznetsov]
> PATCH2: new patch with print code change      [Vitaly Kuznetsov]
> PATCH3: add Reviewed-by                       [Juergen Gross]
>
> Zhenzhong Duan (5):
>    Revert "KVM: X86: Fix setup the virt_spin_lock_key before static key
>      get initialized"
>    x86/kvm: Change print code to use pr_*() format
>    x86/kvm: Add "nopvspin" parameter to disable PV spinlocks
>    xen: Mark "xen_nopvspin" parameter obsolete
>    x86/hyperv: Mark "hv_nopvspin" parameter obsolete
>
>   Documentation/admin-guide/kernel-parameters.txt | 14 ++++-
>   arch/x86/hyperv/hv_spinlock.c                   |  4 ++
>   arch/x86/include/asm/qspinlock.h                |  1 +
>   arch/x86/kernel/kvm.c                           | 79 ++++++++++++++++---------
>   arch/x86/xen/spinlock.c                         |  4 +-
>   kernel/locking/qspinlock.c                      |  7 +++
>   6 files changed, 76 insertions(+), 33 deletions(-)
>