From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751624AbdIENY7 (ORCPT ); Tue, 5 Sep 2017 09:24:59 -0400 Received: from mx2.suse.de ([195.135.220.15]:50170 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750955AbdIENYv (ORCPT ); Tue, 5 Sep 2017 09:24:51 -0400 From: Juergen Gross To: linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org, x86@kernel.org, virtualization@lists.linux-foundation.org Cc: jeremy@goop.org, chrisw@sous-sol.org, akataria@vmware.com, rusty@rustcorp.com.au, boris.ostrovsky@oracle.com, hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com, peterz@infradead.org, longman@redhat.com, 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> X-Mailer: git-send-email 2.12.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.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