From patchwork Sat May 6 15:24:43 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Auger X-Patchwork-Id: 9714921 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id BC96D60362 for ; Sat, 6 May 2017 15:26:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9D67628179 for ; Sat, 6 May 2017 15:26:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 91B0228635; Sat, 6 May 2017 15:26:59 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0F8DA28179 for ; Sat, 6 May 2017 15:26:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753502AbdEFP06 (ORCPT ); Sat, 6 May 2017 11:26:58 -0400 Received: from mx1.redhat.com ([209.132.183.28]:53810 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751907AbdEFP04 (ORCPT ); Sat, 6 May 2017 11:26:56 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 196E580C32; Sat, 6 May 2017 15:26:56 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 196E580C32 Authentication-Results: ext-mx02.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx02.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=eric.auger@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com 196E580C32 Received: from localhost.localdomain.com (ovpn-116-214.ams2.redhat.com [10.36.116.214]) by smtp.corp.redhat.com (Postfix) with ESMTP id C3363179D9; Sat, 6 May 2017 15:26:45 +0000 (UTC) From: Eric Auger To: eric.auger.pro@gmail.com, eric.auger@redhat.com, marc.zyngier@arm.com, christoffer.dall@linaro.org, andre.przywara@arm.com, vijayak@caviumnetworks.com, Vijaya.Kumar@cavium.com, peter.maydell@linaro.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org Cc: Prasun.Kapoor@cavium.com, drjones@redhat.com, pbonzini@redhat.com, dgilbert@redhat.com, quintela@redhat.com, bjsprakash.linux@gmail.com Subject: [PATCH v7 24/24] KVM: arm64: vgic-v3: KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES Date: Sat, 6 May 2017 17:24:43 +0200 Message-Id: <1494084283-12723-25-git-send-email-eric.auger@redhat.com> In-Reply-To: <1494084283-12723-1-git-send-email-eric.auger@redhat.com> References: <1494084283-12723-1-git-send-email-eric.auger@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Sat, 06 May 2017 15:26:56 +0000 (UTC) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds a new attribute to GICV3 KVM device KVM_DEV_ARM_VGIC_GRP_CTRL group. This allows userspace to flush all GICR pending tables into guest RAM. Signed-off-by: Eric Auger Reviewed-by: Christoffer Dall Acked-by: Marc Zyngier --- v6 -> v7: - remove GICR_PENDBASER_ADDRESS - added Christoffer's R-b v5 -> v6: - fix stored - GICR_PEND/PROPBASER_ADDRESS were already introduced v4 -> v5: - move pending table save code/ctrl into VGICv3 instead of ITS - remove useless gpa_t cast - use the same optimization as in its_sync_lpi_pending_table v3 -> v4: - remove the wrong comment about locking - pass kvm struct instead of its handle - add comment about restore method - remove GITR_PENDABASER.PTZ check - continue if target_vcpu == NULL - new locking strategy v1 -> v2: - do not care about the 1st KB which should be zeroed according to the spec. --- arch/arm/include/uapi/asm/kvm.h | 1 + arch/arm64/include/uapi/asm/kvm.h | 1 + virt/kvm/arm/vgic/vgic-kvm-device.c | 20 +++++++++++++++ virt/kvm/arm/vgic/vgic-v3.c | 51 +++++++++++++++++++++++++++++++++++++ virt/kvm/arm/vgic/vgic.h | 1 + 5 files changed, 74 insertions(+) diff --git a/arch/arm/include/uapi/asm/kvm.h b/arch/arm/include/uapi/asm/kvm.h index 8e6563c..78fe803 100644 --- a/arch/arm/include/uapi/asm/kvm.h +++ b/arch/arm/include/uapi/asm/kvm.h @@ -202,6 +202,7 @@ struct kvm_arch_memory_slot { #define KVM_DEV_ARM_VGIC_CTRL_INIT 0 #define KVM_DEV_ARM_ITS_SAVE_TABLES 1 #define KVM_DEV_ARM_ITS_RESTORE_TABLES 2 +#define KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES 3 /* KVM_IRQ_LINE irq field index values */ #define KVM_ARM_IRQ_TYPE_SHIFT 24 diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h index 1e35115..8a3758a 100644 --- a/arch/arm64/include/uapi/asm/kvm.h +++ b/arch/arm64/include/uapi/asm/kvm.h @@ -222,6 +222,7 @@ struct kvm_arch_memory_slot { #define KVM_DEV_ARM_VGIC_CTRL_INIT 0 #define KVM_DEV_ARM_ITS_SAVE_TABLES 1 #define KVM_DEV_ARM_ITS_RESTORE_TABLES 2 +#define KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES 3 /* Device Control API on vcpu fd */ #define KVM_ARM_VCPU_PMU_V3_CTRL 0 diff --git a/virt/kvm/arm/vgic/vgic-kvm-device.c b/virt/kvm/arm/vgic/vgic-kvm-device.c index 859bfa8..d48743c 100644 --- a/virt/kvm/arm/vgic/vgic-kvm-device.c +++ b/virt/kvm/arm/vgic/vgic-kvm-device.c @@ -580,6 +580,24 @@ static int vgic_v3_set_attr(struct kvm_device *dev, reg = tmp32; return vgic_v3_attr_regs_access(dev, attr, ®, true); } + case KVM_DEV_ARM_VGIC_GRP_CTRL: { + int ret; + + switch (attr->attr) { + case KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES: + mutex_lock(&dev->kvm->lock); + + if (!lock_all_vcpus(dev->kvm)) { + mutex_unlock(&dev->kvm->lock); + return -EBUSY; + } + ret = vgic_v3_save_pending_tables(dev->kvm); + unlock_all_vcpus(dev->kvm); + mutex_unlock(&dev->kvm->lock); + return ret; + } + break; + } } return -ENXIO; } @@ -658,6 +676,8 @@ static int vgic_v3_has_attr(struct kvm_device *dev, switch (attr->attr) { case KVM_DEV_ARM_VGIC_CTRL_INIT: return 0; + case KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES: + return 0; } } return -ENXIO; diff --git a/virt/kvm/arm/vgic/vgic-v3.c b/virt/kvm/arm/vgic/vgic-v3.c index 0d753ae..6ff6510 100644 --- a/virt/kvm/arm/vgic/vgic-v3.c +++ b/virt/kvm/arm/vgic/vgic-v3.c @@ -296,6 +296,57 @@ int vgic_v3_lpi_sync_pending_status(struct kvm *kvm, struct vgic_irq *irq) return 0; } +/** + * vgic_its_save_pending_tables - Save the pending tables into guest RAM + * kvm lock and all vcpu lock must be held + */ +int vgic_v3_save_pending_tables(struct kvm *kvm) +{ + struct vgic_dist *dist = &kvm->arch.vgic; + int last_byte_offset = -1; + struct vgic_irq *irq; + int ret; + + list_for_each_entry(irq, &dist->lpi_list_head, lpi_list) { + int byte_offset, bit_nr; + struct kvm_vcpu *vcpu; + gpa_t pendbase, ptr; + bool stored; + u8 val; + + vcpu = irq->target_vcpu; + if (!vcpu) + continue; + + pendbase = GICR_PENDBASER_ADDRESS(vcpu->arch.vgic_cpu.pendbaser); + + byte_offset = irq->intid / BITS_PER_BYTE; + bit_nr = irq->intid % BITS_PER_BYTE; + ptr = pendbase + byte_offset; + + if (byte_offset != last_byte_offset) { + ret = kvm_read_guest(kvm, ptr, &val, 1); + if (ret) + return ret; + last_byte_offset = byte_offset; + } + + stored = val & (1U << bit_nr); + if (stored == irq->pending_latch) + continue; + + if (irq->pending_latch) + val |= 1 << bit_nr; + else + val &= ~(1 << bit_nr); + + ret = kvm_write_guest(kvm, ptr, &val, 1); + if (ret) + return ret; + } + return 0; +} + /* check for overlapping regions and for regions crossing the end of memory */ static bool vgic_v3_check_base(struct kvm *kvm) { diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h index 92a8ca0..8de59a4 100644 --- a/virt/kvm/arm/vgic/vgic.h +++ b/virt/kvm/arm/vgic/vgic.h @@ -181,6 +181,7 @@ void vgic_v3_enable(struct kvm_vcpu *vcpu); int vgic_v3_probe(const struct gic_kvm_info *info); int vgic_v3_map_resources(struct kvm *kvm); int vgic_v3_lpi_sync_pending_status(struct kvm *kvm, struct vgic_irq *irq); +int vgic_v3_save_pending_tables(struct kvm *kvm); int vgic_register_redist_iodevs(struct kvm *kvm, gpa_t dist_base_address); int vgic_register_its_iodevs(struct kvm *kvm);