From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 041A3CA9EB6 for ; Wed, 23 Oct 2019 12:31:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D7EB7222C4 for ; Wed, 23 Oct 2019 12:31:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391413AbfJWMbl (ORCPT ); Wed, 23 Oct 2019 08:31:41 -0400 Received: from Galois.linutronix.de ([193.142.43.55]:49085 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388581AbfJWMbk (ORCPT ); Wed, 23 Oct 2019 08:31:40 -0400 Received: from localhost ([127.0.0.1] helo=nanos.tec.linutronix.de) by Galois.linutronix.de with esmtp (Exim 4.80) (envelope-from ) id 1iNFna-00016r-NM; Wed, 23 Oct 2019 14:31:34 +0200 Message-Id: <20191023122705.198339581@linutronix.de> User-Agent: quilt/0.65 Date: Wed, 23 Oct 2019 14:27:05 +0200 From: Thomas Gleixner To: LKML Cc: x86@kernel.org, Peter Zijlstra , Andy Lutomirski , Will Deacon , Paolo Bonzini , kvm@vger.kernel.org, linux-arch@vger.kernel.org, Mike Rapoport , Josh Poimboeuf , Miroslav Benes Subject: [patch V2 00/17] entry: Provide generic implementation for host and guest entry/exit work Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When working on a way to move out the posix cpu timer expiry out of the timer interrupt context, I noticed that KVM is not handling pending task work before entering a guest. A quick hack was to add that to the x86 KVM handling loop. The discussion ended with a request to make this a generic infrastructure possible with also moving the per arch implementations of the enter from and return to user space handling generic. https://lore.kernel.org/r/89E42BCC-47A8-458B-B06A-D6A20D20512C@amacapital.net The series implements the syscall enter/exit and the general exit to userspace work handling along with the pre guest enter functionality. Changes vs. RFC version: - Dropped ARM64 conversion as requested by ARM64 folks - Addressed various review comments (Peter, Andy, Mike, Paolo, Josh, Miroslav) - Picked up, fixed and completed Peter's patch which makes interrupt enable/disable symmetric in trap handlers - Completed the removal of irq disabling / irq tracing from low level ASM code - Moved KVM specific parts of the enter guest mode handling to KVM (Paolo) The series is also available from git: git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP/core.entry Thanks, tglx RFC version: https://lore.kernel.org/r/20190919150314.054351477@linutronix.de --- /Makefile | 3 arch/Kconfig | 3 arch/x86/Kconfig | 1 arch/x86/entry/calling.h | 12 + arch/x86/entry/common.c | 264 ++------------------------------ arch/x86/entry/entry_32.S | 41 ---- arch/x86/entry/entry_64.S | 32 --- arch/x86/entry/entry_64_compat.S | 30 --- arch/x86/include/asm/irqflags.h | 8 arch/x86/include/asm/paravirt.h | 9 - arch/x86/include/asm/signal.h | 1 arch/x86/include/asm/thread_info.h | 9 - arch/x86/kernel/signal.c | 2 arch/x86/kernel/traps.c | 33 ++-- arch/x86/kvm/x86.c | 17 -- arch/x86/mm/fault.c | 7 b/arch/x86/include/asm/entry-common.h | 104 ++++++++++++ b/arch/x86/kvm/Kconfig | 1 b/include/linux/entry-common.h | 280 ++++++++++++++++++++++++++++++++++ b/kernel/entry/common.c | 184 ++++++++++++++++++++++ include/linux/kvm_host.h | 64 +++++++ kernel/Makefile | 1 virt/kvm/Kconfig | 3 23 files changed, 735 insertions(+), 374 deletions(-)