From patchwork Fri Mar 15 12:05:54 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?C=C3=A9dric_Le_Goater?= X-Patchwork-Id: 10855077 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D71231515 for ; Fri, 15 Mar 2019 15:42:20 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B87D02AAF7 for ; Fri, 15 Mar 2019 15:42:20 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B5CDF2AB03; Fri, 15 Mar 2019 15:42:20 +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=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, 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 ADE3C2AAFF for ; Fri, 15 Mar 2019 15:42:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727838AbfCOPmS (ORCPT ); Fri, 15 Mar 2019 11:42:18 -0400 Received: from 14.mo7.mail-out.ovh.net ([178.33.251.19]:45197 "EHLO 14.mo7.mail-out.ovh.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726792AbfCOPmS (ORCPT ); Fri, 15 Mar 2019 11:42:18 -0400 Received: from player793.ha.ovh.net (unknown [10.109.143.209]) by mo7.mail-out.ovh.net (Postfix) with ESMTP id A654F109D87 for ; Fri, 15 Mar 2019 13:06:51 +0100 (CET) Received: from kaod.org (lfbn-1-2226-17.w90-76.abo.wanadoo.fr [90.76.48.17]) (Authenticated sender: clg@kaod.org) by player793.ha.ovh.net (Postfix) with ESMTPSA id 62A6D3CD1BE3; Fri, 15 Mar 2019 12:06:38 +0000 (UTC) From: =?utf-8?q?C=C3=A9dric_Le_Goater?= To: kvm-ppc@vger.kernel.org Cc: Paul Mackerras , David Gibson , kvm@vger.kernel.org, Michael Ellerman , linuxppc-dev@lists.ozlabs.org, =?utf-8?q?C=C3=A9dric_Le_Goater?= Subject: [PATCH v3 02/17] KVM: PPC: Book3S HV: add a new KVM device for the XIVE native exploitation mode Date: Fri, 15 Mar 2019 13:05:54 +0100 Message-Id: <20190315120609.25910-3-clg@kaod.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190315120609.25910-1-clg@kaod.org> References: <20190315120609.25910-1-clg@kaod.org> MIME-Version: 1.0 X-Ovh-Tracer-Id: 10762195736454335447 X-VR-SPAMSTATE: OK X-VR-SPAMSCORE: -100 X-VR-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgedutddrheehgdefjecutefuodetggdotefrodftvfcurfhrohhfihhlvgemucfqggfjpdevjffgvefmvefgnecuuegrihhlohhuthemucehtddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmd Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This is the basic framework for the new KVM device supporting the XIVE native exploitation mode. The user interface exposes a new KVM device to be created by QEMU, only available when running on a L0 hypervisor only. Support for nested guests is not available yet. The XIVE device reuses the device structure of the XICS-on-XIVE device as they have a lot in common. That could possibly change in the future if the need arise. Signed-off-by: Cédric Le Goater Reviewed-by: David Gibson --- Changes since v2: - removed ->q_order setting. Only useful in the XICS-on-XIVE KVM device which allocates the EQs on behalf of the guest. - returned -ENXIO when VP base is invalid arch/powerpc/include/asm/kvm_host.h | 1 + arch/powerpc/include/asm/kvm_ppc.h | 8 + arch/powerpc/include/uapi/asm/kvm.h | 3 + include/uapi/linux/kvm.h | 2 + arch/powerpc/kvm/book3s.c | 7 +- arch/powerpc/kvm/book3s_xive_native.c | 184 +++++++++++++++++++++ Documentation/virtual/kvm/devices/xive.txt | 19 +++ arch/powerpc/kvm/Makefile | 2 +- 8 files changed, 224 insertions(+), 2 deletions(-) create mode 100644 arch/powerpc/kvm/book3s_xive_native.c create mode 100644 Documentation/virtual/kvm/devices/xive.txt diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index 091430339db1..9f75a75a07f2 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -220,6 +220,7 @@ extern struct kvm_device_ops kvm_xics_ops; struct kvmppc_xive; struct kvmppc_xive_vcpu; extern struct kvm_device_ops kvm_xive_ops; +extern struct kvm_device_ops kvm_xive_native_ops; struct kvmppc_passthru_irqmap; diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h index b3bf4f61b30c..4b72ddde7dc1 100644 --- a/arch/powerpc/include/asm/kvm_ppc.h +++ b/arch/powerpc/include/asm/kvm_ppc.h @@ -593,6 +593,10 @@ extern int kvmppc_xive_set_icp(struct kvm_vcpu *vcpu, u64 icpval); extern int kvmppc_xive_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level, bool line_status); extern void kvmppc_xive_push_vcpu(struct kvm_vcpu *vcpu); + +extern void kvmppc_xive_native_init_module(void); +extern void kvmppc_xive_native_exit_module(void); + #else static inline int kvmppc_xive_set_xive(struct kvm *kvm, u32 irq, u32 server, u32 priority) { return -1; } @@ -616,6 +620,10 @@ static inline int kvmppc_xive_set_icp(struct kvm_vcpu *vcpu, u64 icpval) { retur static inline int kvmppc_xive_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level, bool line_status) { return -ENODEV; } static inline void kvmppc_xive_push_vcpu(struct kvm_vcpu *vcpu) { } + +static inline void kvmppc_xive_native_init_module(void) { } +static inline void kvmppc_xive_native_exit_module(void) { } + #endif /* CONFIG_KVM_XIVE */ #ifdef CONFIG_PPC_POWERNV diff --git a/arch/powerpc/include/uapi/asm/kvm.h b/arch/powerpc/include/uapi/asm/kvm.h index 8c876c166ef2..b002c0c67787 100644 --- a/arch/powerpc/include/uapi/asm/kvm.h +++ b/arch/powerpc/include/uapi/asm/kvm.h @@ -675,4 +675,7 @@ struct kvm_ppc_cpu_char { #define KVM_XICS_PRESENTED (1ULL << 43) #define KVM_XICS_QUEUED (1ULL << 44) +/* POWER9 XIVE Native Interrupt Controller */ +#define KVM_DEV_XIVE_GRP_CTRL 1 + #endif /* __LINUX_KVM_POWERPC_H */ diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 6d4ea4b6c922..e6368163d3a0 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -1211,6 +1211,8 @@ enum kvm_device_type { #define KVM_DEV_TYPE_ARM_VGIC_V3 KVM_DEV_TYPE_ARM_VGIC_V3 KVM_DEV_TYPE_ARM_VGIC_ITS, #define KVM_DEV_TYPE_ARM_VGIC_ITS KVM_DEV_TYPE_ARM_VGIC_ITS + KVM_DEV_TYPE_XIVE, +#define KVM_DEV_TYPE_XIVE KVM_DEV_TYPE_XIVE KVM_DEV_TYPE_MAX, }; diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c index 601c094f15ab..96d43f091255 100644 --- a/arch/powerpc/kvm/book3s.c +++ b/arch/powerpc/kvm/book3s.c @@ -1040,6 +1040,9 @@ static int kvmppc_book3s_init(void) if (xics_on_xive()) { kvmppc_xive_init_module(); kvm_register_device_ops(&kvm_xive_ops, KVM_DEV_TYPE_XICS); + kvmppc_xive_native_init_module(); + kvm_register_device_ops(&kvm_xive_native_ops, + KVM_DEV_TYPE_XIVE); } else #endif kvm_register_device_ops(&kvm_xics_ops, KVM_DEV_TYPE_XICS); @@ -1050,8 +1053,10 @@ static int kvmppc_book3s_init(void) static void kvmppc_book3s_exit(void) { #ifdef CONFIG_KVM_XICS - if (xics_on_xive()) + if (xics_on_xive()) { kvmppc_xive_exit_module(); + kvmppc_xive_native_exit_module(); + } #endif #ifdef CONFIG_KVM_BOOK3S_32_HANDLER kvmppc_book3s_exit_pr(); diff --git a/arch/powerpc/kvm/book3s_xive_native.c b/arch/powerpc/kvm/book3s_xive_native.c new file mode 100644 index 000000000000..76d45bcc7060 --- /dev/null +++ b/arch/powerpc/kvm/book3s_xive_native.c @@ -0,0 +1,184 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2017-2019, IBM Corporation. + */ + +#define pr_fmt(fmt) "xive-kvm: " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include "book3s_xive.h" + +static int kvmppc_xive_native_set_attr(struct kvm_device *dev, + struct kvm_device_attr *attr) +{ + switch (attr->group) { + case KVM_DEV_XIVE_GRP_CTRL: + break; + } + return -ENXIO; +} + +static int kvmppc_xive_native_get_attr(struct kvm_device *dev, + struct kvm_device_attr *attr) +{ + return -ENXIO; +} + +static int kvmppc_xive_native_has_attr(struct kvm_device *dev, + struct kvm_device_attr *attr) +{ + switch (attr->group) { + case KVM_DEV_XIVE_GRP_CTRL: + break; + } + return -ENXIO; +} + +static void kvmppc_xive_native_free(struct kvm_device *dev) +{ + struct kvmppc_xive *xive = dev->private; + struct kvm *kvm = xive->kvm; + + debugfs_remove(xive->dentry); + + pr_devel("Destroying xive native device\n"); + + if (kvm) + kvm->arch.xive = NULL; + + if (xive->vp_base != XIVE_INVALID_VP) + xive_native_free_vp_block(xive->vp_base); + + kfree(xive); + kfree(dev); +} + +static int kvmppc_xive_native_create(struct kvm_device *dev, u32 type) +{ + struct kvmppc_xive *xive; + struct kvm *kvm = dev->kvm; + int ret = 0; + + pr_devel("Creating xive native device\n"); + + if (kvm->arch.xive) + return -EEXIST; + + xive = kzalloc(sizeof(*xive), GFP_KERNEL); + if (!xive) + return -ENOMEM; + + dev->private = xive; + xive->dev = dev; + xive->kvm = kvm; + kvm->arch.xive = xive; + + /* + * Allocate a bunch of VPs. KVM_MAX_VCPUS is a large value for + * a default. Getting the max number of CPUs the VM was + * configured with would improve our usage of the XIVE VP space. + */ + xive->vp_base = xive_native_alloc_vp_block(KVM_MAX_VCPUS); + pr_devel("VP_Base=%x\n", xive->vp_base); + + if (xive->vp_base == XIVE_INVALID_VP) + ret = -ENXIO; + + xive->single_escalation = xive_native_has_single_escalation(); + + if (ret) + kfree(xive); + + return ret; +} + +static int xive_native_debug_show(struct seq_file *m, void *private) +{ + struct kvmppc_xive *xive = m->private; + struct kvm *kvm = xive->kvm; + + if (!kvm) + return 0; + + return 0; +} + +static int xive_native_debug_open(struct inode *inode, struct file *file) +{ + return single_open(file, xive_native_debug_show, inode->i_private); +} + +static const struct file_operations xive_native_debug_fops = { + .open = xive_native_debug_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static void xive_native_debugfs_init(struct kvmppc_xive *xive) +{ + char *name; + + name = kasprintf(GFP_KERNEL, "kvm-xive-%p", xive); + if (!name) { + pr_err("%s: no memory for name\n", __func__); + return; + } + + xive->dentry = debugfs_create_file(name, 0444, powerpc_debugfs_root, + xive, &xive_native_debug_fops); + + pr_debug("%s: created %s\n", __func__, name); + kfree(name); +} + +static void kvmppc_xive_native_init(struct kvm_device *dev) +{ + struct kvmppc_xive *xive = (struct kvmppc_xive *)dev->private; + + /* Register some debug interfaces */ + xive_native_debugfs_init(xive); +} + +struct kvm_device_ops kvm_xive_native_ops = { + .name = "kvm-xive-native", + .create = kvmppc_xive_native_create, + .init = kvmppc_xive_native_init, + .destroy = kvmppc_xive_native_free, + .set_attr = kvmppc_xive_native_set_attr, + .get_attr = kvmppc_xive_native_get_attr, + .has_attr = kvmppc_xive_native_has_attr, +}; + +void kvmppc_xive_native_init_module(void) +{ + ; +} + +void kvmppc_xive_native_exit_module(void) +{ + ; +} diff --git a/Documentation/virtual/kvm/devices/xive.txt b/Documentation/virtual/kvm/devices/xive.txt new file mode 100644 index 000000000000..fdbd2ff92a88 --- /dev/null +++ b/Documentation/virtual/kvm/devices/xive.txt @@ -0,0 +1,19 @@ +POWER9 eXternal Interrupt Virtualization Engine (XIVE Gen1) +========================================================== + +Device types supported: + KVM_DEV_TYPE_XIVE POWER9 XIVE Interrupt Controller generation 1 + +This device acts as a VM interrupt controller. It provides the KVM +interface to configure the interrupt sources of a VM in the underlying +POWER9 XIVE interrupt controller. + +Only one XIVE instance may be instantiated. A guest XIVE device +requires a POWER9 host and the guest OS should have support for the +XIVE native exploitation interrupt mode. If not, it should run using +the legacy interrupt mode, referred as XICS (POWER7/8). + +* Groups: + + 1. KVM_DEV_XIVE_GRP_CTRL + Provides global controls on the device diff --git a/arch/powerpc/kvm/Makefile b/arch/powerpc/kvm/Makefile index 64f1135e7732..806cbe488410 100644 --- a/arch/powerpc/kvm/Makefile +++ b/arch/powerpc/kvm/Makefile @@ -99,7 +99,7 @@ endif kvm-book3s_64-objs-$(CONFIG_KVM_XICS) += \ book3s_xics.o -kvm-book3s_64-objs-$(CONFIG_KVM_XIVE) += book3s_xive.o +kvm-book3s_64-objs-$(CONFIG_KVM_XIVE) += book3s_xive.o book3s_xive_native.o kvm-book3s_64-objs-$(CONFIG_SPAPR_TCE_IOMMU) += book3s_64_vio.o kvm-book3s_64-module-objs := \