Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755561AbbGHWgy (ORCPT ); Wed, 8 Jul 2015 18:36:54 -0400 Received: from mx1.redhat.com ([209.132.183.28]:35313 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933618AbbGHWgq (ORCPT ); Wed, 8 Jul 2015 18:36:46 -0400 From: Bandan Das To: kvm@vger.kernel.org Cc: Paolo Bonzini , Laszlo Ersek , linux-kernel@vger.kernel.org, qemu-devel@nongnu.org Subject: [PATCH] KVM: x86: Add host physical address width capability 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 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1405 Lines: 46 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 -- 2.4.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/