linux-kernel - [PATCH v3 0/2] guard virt_spin

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Message-Id: <20170906173625.18158-1-jgross@suse.com>
Date:   Wed,  6 Sep 2017 19:36:23 +0200
From:   Juergen Gross <jgross@...e.com>
To:     linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
        x86@...nel.org, virtualization@...ts.linux-foundation.org
Cc:     jeremy@...p.org, chrisw@...s-sol.org, akataria@...are.com,
        rusty@...tcorp.com.au, boris.ostrovsky@...cle.com, hpa@...or.com,
        tglx@...utronix.de, mingo@...hat.com, peterz@...radead.org,
        longman@...hat.com, Juergen Gross <jgross@...e.com>
Subject: [PATCH v3 0/2] guard virt_spin_lock() with a static key

With virt_spin_lock() being guarded by a static key the bare metal case
can be optimized by patching the call away completely. In case a kernel
running as a guest it can decide whether to use paravitualized
spinlocks, the current fallback to the unfair test-and-set scheme, or
to mimic the bare metal behavior.

V3:
- remove test for hypervisor environment from virt_spin_lock(9 as
  suggested by Waiman Long

V2:
- use static key instead of making virt_spin_lock() a pvops function

Juergen Gross (2):
  paravirt/locks: use new static key for controlling call of
    virt_spin_lock()
  paravirt,xen: correct xen_nopvspin case

 arch/x86/include/asm/qspinlock.h     | 11 ++++++++++-
 arch/x86/kernel/paravirt-spinlocks.c |  6 ++++++
 arch/x86/kernel/smpboot.c            |  2 ++
 arch/x86/xen/spinlock.c              |  2 ++
 kernel/locking/qspinlock.c           |  4 ++++
 5 files changed, 24 insertions(+), 1 deletion(-)

-- 
2.12.3