From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753446AbeDMIVO (ORCPT ); Fri, 13 Apr 2018 04:21:14 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:54044 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750973AbeDMIVI (ORCPT ); Fri, 13 Apr 2018 04:21:08 -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: [PATCH v3 02/12] KVM: arm/arm64: Document KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION Date: Fri, 13 Apr 2018 10:20:48 +0200 Message-Id: <1523607658-9166-3-git-send-email-eric.auger@redhat.com> In-Reply-To: <1523607658-9166-1-git-send-email-eric.auger@redhat.com> References: <1523607658-9166-1-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 | 25 ++++++++++++++++++++++- 1 file changed, 24 insertions(+), 1 deletion(-) diff --git a/Documentation/virtual/kvm/devices/arm-vgic-v3.txt b/Documentation/virtual/kvm/devices/arm-vgic-v3.txt index 9293b45..cbc4328 100644 --- a/Documentation/virtual/kvm/devices/arm-vgic-v3.txt +++ b/Documentation/virtual/kvm/devices/arm-vgic-v3.txt @@ -27,9 +27,32 @@ 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 .... 16 | 15 - 12 |11 - 0 + values: | count | base | flags | index + - index encodes the unique redistributor region index + - flags: reserved for future use, currently 0 + - base field encodes bits [51:16] of the guest physical base address + of the first redistributor in the region. + - count encodes the number of redistributors in the region. Must be + greater than 0. + There are two 64K pages for each redistributor in the region and + redistributors are laid out contiguously within the region. Regions + are filled with redistributors in the index order. The sum of all + region count fields must be greater than or equal to the number of + VCPUs. Redistributor regions must be registered in the incremental + index order, starting from index 0. + Only valid for KVM_DEV_TYPE_ARM_VGIC_V3. + + It is invalid to mix calls with KVM_VGIC_V3_ADDR_TYPE_REDIST and + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION attributes. + Errors: -E2BIG: Address outside of addressable IPA range - -EINVAL: Incorrectly aligned address + -EINVAL: Incorrectly aligned address, bad redistributor region + count/index, mixed redistributor region attribute usage -EEXIST: Address already configured -ENXIO: The group or attribute is unknown/unsupported for this device or hardware support is missing. -- 2.5.5