From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932924AbeCSJYi (ORCPT ); Mon, 19 Mar 2018 05:24:38 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:36996 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S933040AbeCSJUh (ORCPT ); Mon, 19 Mar 2018 05:20:37 -0400 From: Eric Auger To: eric.auger.pro@gmail.com, eric.auger@redhat.com, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, marc.zyngier@arm.com, cdall@kernel.org, peter.maydell@linaro.org Cc: andre.przywara@arm.com, drjones@redhat.com, wei@redhat.com Subject: [RFC 02/12] KVM: arm/arm64: Document KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION Date: Mon, 19 Mar 2018 10:20:10 +0100 Message-Id: <1521451220-27754-3-git-send-email-eric.auger@redhat.com> In-Reply-To: <1521451220-27754-1-git-send-email-eric.auger@redhat.com> References: <1521451220-27754-1-git-send-email-eric.auger@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We introduce a new KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION attribute in KVM_DEV_ARM_VGIC_GRP_ADDR group. It allows userspace to provide the base address and size of a redistributor region Compared to KVM_VGIC_V3_ADDR_TYPE_REDIST, this new attribute allows to declare several separate redistributor regions. So the whole redist space does not need to be contiguous anymore. Signed-off-by: Eric Auger --- Documentation/virtual/kvm/devices/arm-vgic-v3.txt | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/Documentation/virtual/kvm/devices/arm-vgic-v3.txt b/Documentation/virtual/kvm/devices/arm-vgic-v3.txt index 9293b45..2c0bedf 100644 --- a/Documentation/virtual/kvm/devices/arm-vgic-v3.txt +++ b/Documentation/virtual/kvm/devices/arm-vgic-v3.txt @@ -27,6 +27,18 @@ Groups: VCPU and all of the redistributor pages are contiguous. Only valid for KVM_DEV_TYPE_ARM_VGIC_V3. This address needs to be 64K aligned. + + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION (rw, 64-bit) + The attr field of kvm_device_attr encodes 3 values: + bits: | 63 .... 52 | 51 .... 12 |11 - 0 + values: | pfns | base | index + - index encodes the unique redistibutor region index + - base field encodes bits [51:12] the guest physical base address + of the first redistributor in the region. There are two 64K pages + for each VCPU and all of the redistributor pages are contiguous + within the redistributor region. + - pfns encodes the size of the region in 64kB pages. + Only valid for KVM_DEV_TYPE_ARM_VGIC_V3. Errors: -E2BIG: Address outside of addressable IPA range -EINVAL: Incorrectly aligned address -- 2.5.5