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>
Subject: [PATCH v5 0/5] Add a unified parameter "nopvspin"
Date: Mon, 7 Oct 2019 17:04:26 +0800 [thread overview]
Message-ID: <1570439071-9814-1-git-send-email-zhenzhong.duan@oracle.com> (raw)
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(-)
--
1.8.3.1
next reply other threads:[~2019-10-08 9:01 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-07 9:04 Zhenzhong Duan [this message]
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 ` [PATCH v5 0/5] Add a unified parameter "nopvspin" Zhenzhong Duan
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