From patchwork Fri Jun 6 12:46:05 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Graf X-Patchwork-Id: 356798 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 1EF161400D2 for ; Fri, 6 Jun 2014 22:46:45 +1000 (EST) Received: from localhost ([::1]:46966 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WstXf-0000eQ-5D for incoming@patchwork.ozlabs.org; Fri, 06 Jun 2014 08:46:43 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:45453) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WstXB-0000Dv-3g for qemu-devel@nongnu.org; Fri, 06 Jun 2014 08:46:18 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WstX5-0004Os-FE for qemu-devel@nongnu.org; Fri, 06 Jun 2014 08:46:13 -0400 Received: from cantor2.suse.de ([195.135.220.15]:35951 helo=mx2.suse.de) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WstX5-0004OC-97 for qemu-devel@nongnu.org; Fri, 06 Jun 2014 08:46:07 -0400 Received: from relay1.suse.de (charybdis-ext.suse.de [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 777A7AC55; Fri, 6 Jun 2014 12:46:05 +0000 (UTC) From: Alexander Graf To: qemu-devel@nongnu.org Date: Fri, 6 Jun 2014 14:46:05 +0200 Message-Id: <1402058765-48921-1-git-send-email-agraf@suse.de> X-Mailer: git-send-email 1.8.1.4 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x (no timestamps) [generic] X-Received-From: 195.135.220.15 Cc: pbonzini@redhat.com, kvm@vger.kernel.org Subject: [Qemu-devel] [PATCH] KVM: Fix GSI number space limit X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org KVM tells us the number of GSIs it can handle inside the kernel. That value is basically KVM_MAX_IRQ_ROUTES. However when we try to set the GSI mapping table, it checks for r = -EINVAL; if (routing.nr >= KVM_MAX_IRQ_ROUTES) goto out; erroring out even when we're only using all of the GSIs. To make sure we never hit that limit, let's reduce the number of GSIs we get from KVM by one. Signed-off-by: Alexander Graf Acked-by: Cornelia Huck --- kvm-all.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kvm-all.c b/kvm-all.c index 4e19eff..56a251b 100644 --- a/kvm-all.c +++ b/kvm-all.c @@ -938,7 +938,7 @@ void kvm_init_irq_routing(KVMState *s) { int gsi_count, i; - gsi_count = kvm_check_extension(s, KVM_CAP_IRQ_ROUTING); + gsi_count = kvm_check_extension(s, KVM_CAP_IRQ_ROUTING) - 1; if (gsi_count > 0) { unsigned int gsi_bits, i;