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 [thread overview]
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>
next prev parent reply other threads:[~2019-10-23 15:40 UTC|newest]
Thread overview: 14+ 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
2020-03-14 11:14 ` Paolo Bonzini
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20191023154006.GN329@linux.intel.com \
--to=sean.j.christopherson@intel.com \
--cc=boris.ostrovsky@oracle.com \
--cc=bp@alien8.de \
--cc=corbet@lwn.net \
--cc=haiyangz@microsoft.com \
--cc=hpa@zytor.com \
--cc=jgross@suse.com \
--cc=jmattson@google.com \
--cc=joro@8bytes.org \
--cc=kvm@vger.kernel.org \
--cc=kys@microsoft.com \
--cc=linux-hyperv@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mikelley@microsoft.com \
--cc=mingo@redhat.com \
--cc=pbonzini@redhat.com \
--cc=peterz@infradead.org \
--cc=rkrcmar@redhat.com \
--cc=sashal@kernel.org \
--cc=sthemmin@microsoft.com \
--cc=tglx@linutronix.de \
--cc=vkuznets@redhat.com \
--cc=wanpengli@tencent.com \
--cc=will@kernel.org \
--cc=x86@kernel.org \
--cc=zhenzhong.duan@oracle.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.