From patchwork Thu Nov 24 16:31:30 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?b?UmFkaW0gS3LEjW3DocWZ?= X-Patchwork-Id: 9446097 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id C6F016071C for ; Thu, 24 Nov 2016 16:33:29 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BA56327D8D for ; Thu, 24 Nov 2016 16:33:29 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id AF2ED2808C; Thu, 24 Nov 2016 16:33:29 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.9 required=2.0 tests=BAYES_00,HK_RANDOM_FROM, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 46D6227D8D for ; Thu, 24 Nov 2016 16:33:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934049AbcKXQbs (ORCPT ); Thu, 24 Nov 2016 11:31:48 -0500 Received: from mx1.redhat.com ([209.132.183.28]:35238 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933721AbcKXQbr (ORCPT ); Thu, 24 Nov 2016 11:31:47 -0500 Received: from int-mx14.intmail.prod.int.phx2.redhat.com (int-mx14.intmail.prod.int.phx2.redhat.com [10.5.11.27]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 75D45C04B328; Thu, 24 Nov 2016 16:31:47 +0000 (UTC) Received: from potion (dhcp-1-116.brq.redhat.com [10.34.1.116]) by int-mx14.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with SMTP id uAOGVj7l002595; Thu, 24 Nov 2016 11:31:45 -0500 Received: by potion (sSMTP sendmail emulation); Thu, 24 Nov 2016 17:31:44 +0100 From: =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: Paolo Bonzini Subject: [PATCH 2/6] KVM: x86: decouple irqchip_in_kernel() and pic_irqchip() Date: Thu, 24 Nov 2016 17:31:30 +0100 Message-Id: <20161124163134.4630-3-rkrcmar@redhat.com> In-Reply-To: <20161124163134.4630-1-rkrcmar@redhat.com> References: <20161124163134.4630-1-rkrcmar@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.68 on 10.5.11.27 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Thu, 24 Nov 2016 16:31:47 +0000 (UTC) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP irqchip_in_kernel() tried to save a bit by reusing pic_irqchip(), but it just complicated the code. Add kvm->arch.irqchip_kvm that matches kvm->arch.irqchip_split. (Turning them into an exclusive type would be nicer.) Signed-off-by: Radim Krčmář --- arch/x86/include/asm/kvm_host.h | 1 + arch/x86/kvm/irq.h | 13 +++++++------ arch/x86/kvm/x86.c | 3 ++- 3 files changed, 10 insertions(+), 7 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index bdde80731f49..929228ec2839 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -778,6 +778,7 @@ struct kvm_arch { u64 disabled_quirks; + bool irqchip_kvm; bool irqchip_split; u8 nr_reserved_ioapic_pins; diff --git a/arch/x86/kvm/irq.h b/arch/x86/kvm/irq.h index 035731eb3897..8536be85d529 100644 --- a/arch/x86/kvm/irq.h +++ b/arch/x86/kvm/irq.h @@ -96,15 +96,16 @@ static inline int irqchip_split(struct kvm *kvm) return kvm->arch.irqchip_split; } +static inline int irqchip_kvm(struct kvm *kvm) +{ + return kvm->arch.irqchip_kvm; +} + static inline int irqchip_in_kernel(struct kvm *kvm) { - struct kvm_pic *vpic = pic_irqchip(kvm); - bool ret; + bool ret = irqchip_kvm(kvm) || irqchip_split(kvm); - ret = (vpic != NULL); - ret |= irqchip_split(kvm); - - /* Read vpic before kvm->irq_routing. */ + /* Matches with wmb after initializing kvm->irq_routing. */ smp_rmb(); return ret; } diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index dbed51045c37..dd8431a7e18b 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -3928,8 +3928,9 @@ long kvm_arch_vm_ioctl(struct file *filp, mutex_unlock(&kvm->slots_lock); goto create_irqchip_unlock; } - /* Write kvm->irq_routing before kvm->arch.vpic. */ + /* Write kvm->irq_routing before enabling irqchip_in_kernel. */ smp_wmb(); + kvm->arch.irqchip_kvm = true; kvm->arch.vpic = vpic; create_irqchip_unlock: mutex_unlock(&kvm->lock);