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From: Sean Christopherson <sean.j.christopherson@intel.com>
To: Zhenzhong Duan <zhenzhong.duan@oracle.com>
Cc: linux-kernel@vger.kernel.org, tglx@linutronix.de,
	mingo@redhat.com, bp@alien8.de, x86@kernel.org,
	pbonzini@redhat.com, rkrcmar@redhat.com, vkuznets@redhat.com,
	wanpengli@tencent.com, jmattson@google.com, joro@8bytes.org,
	boris.ostrovsky@oracle.com, jgross@suse.com,
	peterz@infradead.org, will@kernel.org,
	linux-hyperv@vger.kernel.org, kvm@vger.kernel.org,
	mikelley@microsoft.com, kys@microsoft.com,
	haiyangz@microsoft.com, sthemmin@microsoft.com,
	sashal@kernel.org, Jonathan Corbet <corbet@lwn.net>,
	"H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH v8 3/5] x86/kvm: Add "nopvspin" parameter to disable PV spinlocks
Date: Wed, 23 Oct 2019 08:40:06 -0700
Message-ID: <20191023154006.GN329@linux.intel.com> (raw)
In-Reply-To: <1571829384-5309-4-git-send-email-zhenzhong.duan@oracle.com>

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@oracle.com>
> Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
> Cc: Jonathan Corbet <corbet@lwn.net>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Ingo Molnar <mingo@redhat.com>
> Cc: Borislav Petkov <bp@alien8.de>
> Cc: "H. Peter Anvin" <hpa@zytor.com>
> Cc: Paolo Bonzini <pbonzini@redhat.com>
> Cc: Radim Krcmar <rkrcmar@redhat.com>
> Cc: Sean Christopherson <sean.j.christopherson@intel.com>
> Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
> Cc: Wanpeng Li <wanpengli@tencent.com>
> Cc: Jim Mattson <jmattson@google.com>
> Cc: Joerg Roedel <joro@8bytes.org>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Will Deacon <will@kernel.org>
> ---

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

  reply index

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-23 11:16 [PATCH v8 0/5] Add a unified parameter "nopvspin" Zhenzhong Duan
2019-10-23 11:16 ` [PATCH v8 1/5] Revert "KVM: X86: Fix setup the virt_spin_lock_key before static key get initialized" Zhenzhong Duan
2019-11-19  7:00   ` Wanpeng Li
2019-10-23 11:16 ` [PATCH v8 2/5] x86/kvm: Change print code to use pr_*() format Zhenzhong Duan
2019-10-23 15:38   ` Sean Christopherson
2019-11-19  7:01   ` Wanpeng Li
2019-10-23 11:16 ` [PATCH v8 3/5] x86/kvm: Add "nopvspin" parameter to disable PV spinlocks Zhenzhong Duan
2019-10-23 15:40   ` Sean Christopherson [this message]
2019-11-19  7:01   ` Wanpeng Li
2019-10-23 11:16 ` [PATCH v8 4/5] xen: Mark "xen_nopvspin" parameter obsolete Zhenzhong Duan
2019-10-23 11:16 ` [PATCH v8 5/5] x86/hyperv: Mark "hv_nopvspin" " Zhenzhong Duan
2019-10-29  1:33 ` [PATCH v8 0/5] Add a unified parameter "nopvspin" Zhenzhong Duan
2019-11-19  2:01   ` Zhenzhong Duan

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