From patchwork Wed Jul 8 22:36:43 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bandan Das X-Patchwork-Id: 493180 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 7C478140D15 for ; Thu, 9 Jul 2015 08:37:12 +1000 (AEST) Received: from localhost ([::1]:37083 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZCxxj-0001lg-Py for incoming@patchwork.ozlabs.org; Wed, 08 Jul 2015 18:37:07 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:51070) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZCxxS-0001Ug-GX for qemu-devel@nongnu.org; Wed, 08 Jul 2015 18:36:51 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZCxxP-00024f-8n for qemu-devel@nongnu.org; Wed, 08 Jul 2015 18:36:50 -0400 Received: from mx1.redhat.com ([209.132.183.28]:50009) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZCxxP-00024P-3F for qemu-devel@nongnu.org; Wed, 08 Jul 2015 18:36:47 -0400 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) by mx1.redhat.com (Postfix) with ESMTPS id 1A421B6F46; Wed, 8 Jul 2015 22:36:46 +0000 (UTC) Received: from aqua (ovpn-113-63.phx2.redhat.com [10.3.113.63]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id t68MaiXv021938 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Wed, 8 Jul 2015 18:36:45 -0400 From: Bandan Das To: kvm@vger.kernel.org Date: Wed, 08 Jul 2015 18:36:43 -0400 Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.68 on 10.5.11.24 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 209.132.183.28 Cc: Paolo Bonzini , Laszlo Ersek , linux-kernel@vger.kernel.org, qemu-devel@nongnu.org Subject: [Qemu-devel] [PATCH] KVM: x86: Add host physical address width capability 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 Let userspace inquire the maximum physical address width of the host processors; this can be used to identify maximum memory that can be assigned to the guest. Reported-by: Laszlo Ersek Signed-off-by: Bandan Das --- arch/x86/kvm/x86.c | 3 +++ include/uapi/linux/kvm.h | 1 + 2 files changed, 4 insertions(+) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index bbaf44e..97d6746 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -2683,6 +2683,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) case KVM_CAP_NR_MEMSLOTS: r = KVM_USER_MEM_SLOTS; break; + case KVM_CAP_PHY_ADDR_WIDTH: + r = boot_cpu_data.x86_phys_bits; + break; case KVM_CAP_PV_MMU: /* obsolete */ r = 0; break; diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 716ad4a..e7949a1 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -817,6 +817,7 @@ struct kvm_ppc_smmu_info { #define KVM_CAP_DISABLE_QUIRKS 116 #define KVM_CAP_X86_SMM 117 #define KVM_CAP_MULTI_ADDRESS_SPACE 118 +#define KVM_CAP_PHY_ADDR_WIDTH 119 #ifdef KVM_CAP_IRQ_ROUTING