From patchwork Thu Jan 15 14:47:45 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Auger X-Patchwork-Id: 5640731 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id B377EC058D for ; Thu, 15 Jan 2015 14:52:58 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id CC8582017D for ; Thu, 15 Jan 2015 14:52:57 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C2B6920149 for ; Thu, 15 Jan 2015 14:52:55 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1YBll7-0000vo-AA; Thu, 15 Jan 2015 14:50:53 +0000 Received: from mail-wi0-f171.google.com ([209.85.212.171]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1YBlkX-00084Y-Ix for linux-arm-kernel@lists.infradead.org; Thu, 15 Jan 2015 14:50:18 +0000 Received: by mail-wi0-f171.google.com with SMTP id ho1so2980469wib.4 for ; Thu, 15 Jan 2015 06:49:55 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=ZO/Fws5uP8TDqtlfuavw0TLZTt5+MDyX4sTQgMzCgBQ=; b=UIchTAh/1v+6FpMK2v0nHJnchAad1LrscKaTR+6EkowiqLxKsFfu1SDG/xvn6JVbOF xbL6cMB6+qyH7w47LOyH9d9G729jR3MU5gJsk065PnhecE+lv2ucSVwMVbWIwVIMoQtm pPHe+rjNhaEbit6un8pHYyVj3Ux3j3RB0iExumGHD+QVTTmpTgLFYxkWgkQb+FDspnfP z189L4HqgXMPEalqXoc2Zdvb8qC8um8msyQYag8CnbPxVpam1GFj23rBbVs/dF9E9Jrk hj81RHIl2pGQUliGrQRck5pvLwmG1iH1Yc6x1AQ3U/8DTt2KxWLfGT+pDivmkMNHMt0s mStg== X-Gm-Message-State: ALoCoQmHmwvyVCPs5njUEXjFDpOcrwr4I9mXuNVlEqVpRu6g7xfcoFMEPYlQMIfAV2GRsH0sqwnC X-Received: by 10.194.206.70 with SMTP id lm6mr19127712wjc.30.1421333395429; Thu, 15 Jan 2015 06:49:55 -0800 (PST) Received: from gnx2579.gnb.st.com (LCaen-156-56-7-90.w80-11.abo.wanadoo.fr. [80.11.198.90]) by mx.google.com with ESMTPSA id i3sm2389150wjw.2.2015.01.15.06.49.53 (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 15 Jan 2015 06:49:54 -0800 (PST) From: Eric Auger To: eric.auger@st.com, eric.auger@linaro.org, christoffer.dall@linaro.org, marc.zyngier@arm.com, andre.przywara@arm.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, alex.williamson@redhat.com, agraf@suse.de, gleb@kernel.org, pbonzini@redhat.com, borntraeger@de.ibm.com, cornelia.huck@de.ibm.com Subject: [PATCH v7 2/4] KVM: introduce kvm_arch_intc_initialized and use it in irqfd Date: Thu, 15 Jan 2015 15:47:45 +0100 Message-Id: <1421333267-15287-3-git-send-email-eric.auger@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1421333267-15287-1-git-send-email-eric.auger@linaro.org> References: <1421333267-15287-1-git-send-email-eric.auger@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150115_065017_817444_54A76C6E X-CRM114-Status: GOOD ( 11.20 ) X-Spam-Score: -0.7 (/) Cc: a.motakis@virtualopensystems.com, will.deacon@arm.com, linux-kernel@vger.kernel.org, patches@linaro.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Introduce __KVM_HAVE_ARCH_INTC_INITIALIZED define and associated kvm_arch_intc_initialized function. This latter allows to test whether the virtual interrupt controller is initialized and ready to accept virtual IRQ injection. On some architectures, the virtual interrupt controller is dynamically instantiated, justifying that kind of check. The new function can now be used by irqfd to check whether the virtual interrupt controller is ready on KVM_IRQFD request. If not, KVM_IRQFD returns -EAGAIN. Signed-off-by: Eric Auger Acked-by: Christoffer Dall Reviewed-by: Andre Przywara --- v6 -> v7: - From now on, kvm_irqfd_assign calls kvm_arch_intc_initialized (previously introduced in subsequent patch file). - add Christoffer's ack v5 -> v6: - rename function name and macro - add kvm_arch_intc_initialized declaration in case the archi defines the macro --- include/linux/kvm_host.h | 14 ++++++++++++++ virt/kvm/eventfd.c | 3 +++ 2 files changed, 17 insertions(+) diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 26f1060..702036a 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -706,6 +706,20 @@ static inline wait_queue_head_t *kvm_arch_vcpu_wq(struct kvm_vcpu *vcpu) #endif } +#ifdef __KVM_HAVE_ARCH_INTC_INITIALIZED +/* + * returns trues if the virtual interrupt controller is initialized and + * ready to accept virtual IRQ. On some architectures the virtual interrupt + * controller is dynamically instantiated and this is not always true. + */ +bool kvm_arch_intc_initialized(struct kvm *kvm); +#else +static inline bool kvm_arch_intc_initialized(struct kvm *kvm) +{ + return true; +} +#endif + int kvm_arch_init_vm(struct kvm *kvm, unsigned long type); void kvm_arch_destroy_vm(struct kvm *kvm); void kvm_arch_sync_events(struct kvm *kvm); diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c index 148b239..fc5f43e 100644 --- a/virt/kvm/eventfd.c +++ b/virt/kvm/eventfd.c @@ -311,6 +311,9 @@ kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args) unsigned int events; int idx; + if (!kvm_arch_intc_initialized(kvm)) + return -EAGAIN; + irqfd = kzalloc(sizeof(*irqfd), GFP_KERNEL); if (!irqfd) return -ENOMEM;