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,
Zhenzhong Duan <zhenzhong.duan@oracle.com>,
Jonathan Corbet <corbet@lwn.net>,
"H. Peter Anvin" <hpa@zytor.com>
Subject: [PATCH v4 4/4] x86/hyperv: Mark "hv_nopvspin" parameter obsolete
Date: Thu, 3 Oct 2019 22:02:15 +0800 [thread overview]
Message-ID: <1570111335-12731-5-git-send-email-zhenzhong.duan@oracle.com> (raw)
In-Reply-To: <1570111335-12731-1-git-send-email-zhenzhong.duan@oracle.com>
Map "hv_nopvspin" to "nopvspin".
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@oracle.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: Sasha Levin <sashal@kernel.org>
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>
---
Documentation/admin-guide/kernel-parameters.txt | 6 +++++-
arch/x86/hyperv/hv_spinlock.c | 4 ++++
2 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index df1eacc..08c6d34 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -1436,6 +1436,10 @@
hv_nopvspin [X86,HYPER_V] Disables the paravirt spinlock optimizations
which allow the hypervisor to 'idle' the
guest on lock contention.
+ This parameter is obsoleted by "nopvspin"
+ parameter, which has equivalent effect for
+ HYPER_V platform.
+
keep_bootcon [KNL]
Do not unregister boot console at start. This is only
@@ -5331,7 +5335,7 @@
as generic guest with no PV drivers. Currently support
XEN HVM, KVM, HYPER_V and VMWARE guest.
- nopvspin [X86,XEN,KVM]
+ nopvspin [X86,XEN,KVM,HYPER_V]
Disables the qspinlock slow path using PV optimizations
which allow the hypervisor to 'idle' the guest on lock
contention.
diff --git a/arch/x86/hyperv/hv_spinlock.c b/arch/x86/hyperv/hv_spinlock.c
index 07f21a0..47c7d6c 100644
--- a/arch/x86/hyperv/hv_spinlock.c
+++ b/arch/x86/hyperv/hv_spinlock.c
@@ -64,6 +64,9 @@ __visible bool hv_vcpu_is_preempted(int vcpu)
void __init hv_init_spinlocks(void)
{
+ if (nopvspin)
+ hv_pvspin = false;
+
if (!hv_pvspin || !apic ||
!(ms_hyperv.hints & HV_X64_CLUSTER_IPI_RECOMMENDED) ||
!(ms_hyperv.features & HV_X64_MSR_GUEST_IDLE_AVAILABLE)) {
@@ -82,6 +85,7 @@ void __init hv_init_spinlocks(void)
static __init int hv_parse_nopvspin(char *arg)
{
+ pr_notice("\"hv_nopvspin\" is deprecated, please use \"nopvspin\" instead\n");
hv_pvspin = false;
return 0;
}
--
1.8.3.1
next prev parent reply other threads:[~2019-10-04 14:00 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-03 14:02 [PATCH v4 0/4] Add a unified parameter "nopvspin" Zhenzhong Duan
2019-10-03 14:02 ` [PATCH v4 1/4] x86/kvm: Add "nopvspin" parameter to disable PV spinlocks Zhenzhong Duan
2019-10-04 14:52 ` Boris Ostrovsky
2019-10-06 7:49 ` Zhenzhong Duan
2019-10-07 14:46 ` Boris Ostrovsky
2019-10-08 2:17 ` Zhenzhong Duan
2019-10-03 14:02 ` [PATCH v4 2/4] x86/kvm: Change print code to use pr_*() format Zhenzhong Duan
2019-10-03 14:02 ` [PATCH v4 3/4] xen: Mark "xen_nopvspin" parameter obsolete Zhenzhong Duan
2019-10-04 14:57 ` Boris Ostrovsky
2019-10-06 7:52 ` Zhenzhong Duan
2019-10-03 14:02 ` Zhenzhong Duan [this message]
2019-10-05 17:07 ` [PATCH v4 4/4] x86/hyperv: Mark "hv_nopvspin" " Michael Kelley
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