From mboxrd@z Thu Jan 1 00:00:00 1970 From: Juergen Gross Subject: [PATCH 0/4] make virt_spin_lock() a pvops function Date: Tue, 5 Sep 2017 15:24:40 +0200 Message-ID: <20170905132444.7163-1-jgross@suse.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: virtualization-bounces@lists.linux-foundation.org Errors-To: virtualization-bounces@lists.linux-foundation.org To: linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org, x86@kernel.org, virtualization@lists.linux-foundation.org Cc: Juergen Gross , jeremy@goop.org, peterz@infradead.org, chrisw@sous-sol.org, mingo@redhat.com, tglx@linutronix.de, hpa@zytor.com, longman@redhat.com, akataria@vmware.com, boris.ostrovsky@oracle.com List-Id: virtualization@lists.linuxfoundation.org With virt_spin_lock() being a pvops function 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. Juergen Gross (4): paravirt: add generic _paravirt_false() function paravirt: switch vcpu_is_preempted to use _paravirt_false() on bare metal paravirt: add virt_spin_lock pvops function paravirt,xen: correct xen_nopvspin case arch/x86/include/asm/paravirt.h | 5 ++++ arch/x86/include/asm/paravirt_types.h | 3 +++ arch/x86/include/asm/qspinlock.h | 48 ++++++++++++++++++++++++----------- arch/x86/kernel/paravirt-spinlocks.c | 22 ++++++++-------- arch/x86/kernel/paravirt.c | 7 +++++ arch/x86/kernel/paravirt_patch_32.c | 18 ++++++------- arch/x86/kernel/paravirt_patch_64.c | 17 +++++-------- arch/x86/kernel/smpboot.c | 2 ++ arch/x86/xen/spinlock.c | 2 ++ 9 files changed, 79 insertions(+), 45 deletions(-) -- 2.12.3