linux-kernel - [PATCH v2 0/2] x86/entry: speed up context-tracking system calls by 150 clock cycles

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Date:	Mon, 20 Jun 2016 16:58:28 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:	Andy Lutomirski <luto@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	"H . Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH v2 0/2] x86/entry: speed up context-tracking system calls by 150 clock cycles

The first patches are the two optimizations I posted on May 30th
for the system call entry/exit code.  The only change is in the
function names, which use the user_{enter,exit}_irqoff favored
by Andy and Ingo.  The first patch matches what commit d0e536d8939
("context_tracking: avoid irq_save/irq_restore on guest entry and exit",
2015-10-28) did for guest entry and exit.  The second simply adds
an inline annotation; the compiler doesn't figure it out because the
function is not static.

The second two patches move guest_{enter,exit} to the same naming
convention, removing the KVM wrappers kvm_guest_{enter,exit} and
__kvm_guest_{enter,exit} in the process.  I would like these two to
go through the KVM tree because I have other optimizations for 4.8
on top of these patches.

Thanks,

Paolo

Paolo Bonzini (4):
  x86/entry: Avoid interrupt flag save and restore
  x86/entry: Inline enter_from_user_mode
  context_tracking: move rcu_virt_note_context_switch out of kvm_host.h
  KVM: remove kvm_guest_enter/exit wrappers

 arch/arm/kvm/arm.c               |  8 +++---
 arch/mips/kvm/mips.c             |  4 +--
 arch/powerpc/kvm/book3s_hv.c     |  4 +--
 arch/powerpc/kvm/book3s_pr.c     |  4 +--
 arch/powerpc/kvm/booke.c         |  4 +--
 arch/powerpc/kvm/powerpc.c       |  2 +-
 arch/s390/kvm/kvm-s390.c         |  4 +--
 arch/x86/entry/common.c          |  6 ++---
 arch/x86/kvm/x86.c               |  4 +--
 include/linux/context_tracking.h | 53 +++++++++++++++++++++++++++++++++++++---
 include/linux/kvm_host.h         | 39 -----------------------------
 11 files changed, 69 insertions(+), 63 deletions(-)

-- 
1.8.3.1