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From: Zhenzhong Duan <zhenzhong.duan@oracle.com>
To: linux-kernel@vger.kernel.org
Cc: vkuznets@redhat.com, linux-hyperv@vger.kernel.org,
	kvm@vger.kernel.org, kys@microsoft.com, haiyangz@microsoft.com,
	sthemmin@microsoft.com, sashal@kernel.org, tglx@linutronix.de,
	mingo@redhat.com, bp@alien8.de, pbonzini@redhat.com,
	rkrcmar@redhat.com, sean.j.christopherson@intel.com,
	wanpengli@tencent.com, jmattson@google.com, joro@8bytes.org,
	boris.ostrovsky@oracle.com, jgross@suse.com,
	sstabellini@kernel.org, peterz@infradead.org
Subject: Re: [PATCH v5 0/5] Add a unified parameter "nopvspin"
Date: Sat, 12 Oct 2019 16:40:11 +0800
Message-ID: <d04aacc3-c816-94a6-052f-bf306ec23941@oracle.com> (raw)
In-Reply-To: <1570439071-9814-1-git-send-email-zhenzhong.duan@oracle.com>

The last two patches are reviewed, will any KVM expert be willing to 
review the first three patches?

They are all KVM related changes. Thanks

Zhenzhong

On 2019/10/7 17:04, 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.
>
> 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                           | 63 ++++++++++++++-----------
>   arch/x86/xen/spinlock.c                         |  4 +-
>   kernel/locking/qspinlock.c                      |  7 +++
>   6 files changed, 62 insertions(+), 31 deletions(-)
>

      parent reply index

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-07  9:04 Zhenzhong Duan
2019-10-07  9:04 ` [PATCH v5 1/5] Revert "KVM: X86: Fix setup the virt_spin_lock_key before static key get initialized" Zhenzhong Duan
2019-10-13  9:08   ` Vitaly Kuznetsov
2019-10-07  9:04 ` [PATCH v5 2/5] x86/kvm: Change print code to use pr_*() format Zhenzhong Duan
2019-10-13  9:06   ` Vitaly Kuznetsov
2019-10-14  1:38     ` Zhenzhong Duan
2019-10-07  9:04 ` [PATCH v5 3/5] x86/kvm: Add "nopvspin" parameter to disable PV spinlocks Zhenzhong Duan
2019-10-13  9:02   ` Vitaly Kuznetsov
2019-10-14  1:52     ` Zhenzhong Duan
2019-10-14  9:18       ` Vitaly Kuznetsov
2019-10-07  9:04 ` [PATCH v5 4/5] xen: Mark "xen_nopvspin" parameter obsolete Zhenzhong Duan
2019-10-07  9:04 ` [PATCH v5 5/5] x86/hyperv: Mark "hv_nopvspin" " Zhenzhong Duan
2019-10-12  8:40 ` Zhenzhong Duan [this message]

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