From patchwork Tue Jan 13 17:33:40 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Auger X-Patchwork-Id: 5622731 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id CCEBB9F2ED for ; Tue, 13 Jan 2015 17:39:47 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 96A3420397 for ; Tue, 13 Jan 2015 17:39:46 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 56D7420304 for ; Tue, 13 Jan 2015 17:39:45 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1YB5P9-0008Hf-Ad; Tue, 13 Jan 2015 17:37:23 +0000 Received: from mail-wi0-f169.google.com ([209.85.212.169]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1YB5O1-0006jc-Ge for linux-arm-kernel@lists.infradead.org; Tue, 13 Jan 2015 17:36:15 +0000 Received: by mail-wi0-f169.google.com with SMTP id n3so6545739wiv.0 for ; Tue, 13 Jan 2015 09:35:51 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=hfT6BDxIWmQItecILFNeokoNWTLrjGfE8ZllkPJRB+E=; b=L0i5Qk1SLNMhMSHZB2HxisTxkUprqpdQmi+mFspQrZT0EmJ9/J6xhYoPyXkDfAAAQc cCLpP+BJud35aIrvwzMGv3ICwbsKMEW8aqwJ9VkFORcClRhRX0W4gG0AAUN/f4ZMkPee /kFeCwV9ejTWTQ7oxpIdyjM6ULjEKg3boYPKeGcQ6Okt0KX6BNcgDMyicm+zkl4LW0Z8 o4xJerJveUQIMW/dEnGz/qS4e8NM/LhH5mzlVwOpxOLLOKp7DZ8aoA70X47faa/anUeh yyYcf8pw7lfPezfw/CBfspcSVjiLlv3x27FV4fgrG6nte8C7U9P7jFPEK5GdTRDcFydb oOMQ== X-Gm-Message-State: ALoCoQkux5HYsZnOUKeoyG7YaoJvHUwB4HkijDE9kxovu4b6dWxzvQ8Jl2Q5MmqIu7tS5GuBIMSI X-Received: by 10.180.218.39 with SMTP id pd7mr744415wic.21.1421170550083; Tue, 13 Jan 2015 09:35:50 -0800 (PST) Received: from gnx2579.gnb.st.com (LCaen-156-56-7-90.w80-11.abo.wanadoo.fr. [80.11.198.90]) by mx.google.com with ESMTPSA id fw6sm2660487wib.1.2015.01.13.09.35.47 (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 13 Jan 2015 09:35:49 -0800 (PST) From: Eric Auger To: eric.auger@st.com, eric.auger@linaro.org, christoffer.dall@linaro.org, marc.zyngier@arm.com, andre.przywara@arm.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, alex.williamson@redhat.com, agraf@suse.de, joel.schopp@amd.com, kim.phillips@freescale.com, paulus@samba.org, gleb@kernel.org, pbonzini@redhat.com, borntraeger@de.ibm.com, cornelia.huck@de.ibm.com Subject: [PATCH v6 4/4] KVM: arm/arm64: add irqfd support Date: Tue, 13 Jan 2015 18:33:40 +0100 Message-Id: <1421170420-30617-5-git-send-email-eric.auger@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1421170420-30617-1-git-send-email-eric.auger@linaro.org> References: <1421170420-30617-1-git-send-email-eric.auger@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150113_093613_937353_5B132C7A X-CRM114-Status: GOOD ( 24.60 ) X-Spam-Score: -0.7 (/) Cc: b.reynal@virtualopensystems.com, feng.wu@intel.com, patches@linaro.org, john.liuli@huawei.com, ming.lei@canonical.com, will.deacon@arm.com, a.rigo@virtualopensystems.com, linux-kernel@vger.kernel.org, a.motakis@virtualopensystems.com X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch enables irqfd on arm/arm64. Both irqfd and resamplefd are supported. Injection is implemented in vgic.c without routing. This patch enables CONFIG_HAVE_KVM_EVENTFD and CONFIG_HAVE_KVM_IRQFD. KVM_CAP_IRQFD is now advertised. KVM_CAP_IRQFD_RESAMPLE capability automatically is advertised as soon as CONFIG_HAVE_KVM_IRQFD is set. Irqfd injection is restricted to SPI. The rationale behind not supporting PPI irqfd injection is that any device using a PPI would be a private-to-the-CPU device (timer for instance), so its state would have to be context-switched along with the VCPU and would require in-kernel wiring anyhow. It is not a relevant use case for irqfds. Signed-off-by: Eric Auger Reviewed-by: Christoffer Dall --- v5 -> v6: - KVM_CAP_IRQFD support depends on vgic_present - add Christoffer's Reviewed-by v4 -> v5: - squash [PATCH v4 3/3] KVM: arm64: add irqfd support into this patch - some rewording in Documentation/virtual/kvm/api.txt and in vgic vgic_process_maintenance unlock comment. - move explanation of why not supporting PPI into commit message - in case of injection before gic readiness, -ENODEV is returned. It is up to the user space to avoid this situation. v3 -> v4: - reword commit message - explain why we unlock the distributor before calling kvm_notify_acked_irq - rename is_assigned_irq into has_notifier - change EOI and injection kvm_debug format string - remove error local variable in kvm_set_irq - Move HAVE_KVM_IRQCHIP unset in a separate patch - handle case were the irqfd injection is attempted before the vgic is ready. in such a case the notifier, if any, is called immediatly - use nr_irqs to test spi is within correct range v2 -> v3: - removal of irq.h from eventfd.c put in a separate patch to increase visibility - properly expose KVM_CAP_IRQFD capability in arm.c - remove CONFIG_HAVE_KVM_IRQCHIP meaningfull only if irq_comm.c is used v1 -> v2: - rebase on 3.17rc1 - move of the dist unlock in process_maintenance - remove of dist lock in __kvm_vgic_sync_hwstate - rewording of the commit message (add resamplefd reference) - remove irq.h --- Documentation/virtual/kvm/api.txt | 6 +++- arch/arm/include/uapi/asm/kvm.h | 3 ++ arch/arm/kvm/Kconfig | 2 ++ arch/arm/kvm/Makefile | 2 +- arch/arm/kvm/arm.c | 5 ++++ arch/arm64/include/uapi/asm/kvm.h | 3 ++ arch/arm64/kvm/Kconfig | 2 ++ arch/arm64/kvm/Makefile | 2 +- virt/kvm/arm/vgic.c | 63 ++++++++++++++++++++++++++++++++++++--- 9 files changed, 81 insertions(+), 7 deletions(-) diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index 0007fef..5ed8088 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -2231,7 +2231,7 @@ into the hash PTE second double word). 4.75 KVM_IRQFD Capability: KVM_CAP_IRQFD -Architectures: x86 s390 +Architectures: x86 s390 arm arm64 Type: vm ioctl Parameters: struct kvm_irqfd (in) Returns: 0 on success, -1 on error @@ -2257,6 +2257,10 @@ Note that closing the resamplefd is not sufficient to disable the irqfd. The KVM_IRQFD_FLAG_RESAMPLE is only necessary on assignment and need not be specified with KVM_IRQFD_FLAG_DEASSIGN. +On ARM/ARM64, the gsi field in the kvm_irqfd struct specifies the Shared +Peripheral Interrupt (SPI) index, such that the GIC interrupt ID is +given by gsi + 32. + 4.76 KVM_PPC_ALLOCATE_HTAB Capability: KVM_CAP_PPC_ALLOC_HTAB diff --git a/arch/arm/include/uapi/asm/kvm.h b/arch/arm/include/uapi/asm/kvm.h index 0db25bc..2499867 100644 --- a/arch/arm/include/uapi/asm/kvm.h +++ b/arch/arm/include/uapi/asm/kvm.h @@ -198,6 +198,9 @@ struct kvm_arch_memory_slot { /* Highest supported SPI, from VGIC_NR_IRQS */ #define KVM_ARM_IRQ_GIC_MAX 127 +/* One single KVM irqchip, ie. the VGIC */ +#define KVM_NR_IRQCHIPS 1 + /* PSCI interface */ #define KVM_PSCI_FN_BASE 0x95c1ba5e #define KVM_PSCI_FN(n) (KVM_PSCI_FN_BASE + (n)) diff --git a/arch/arm/kvm/Kconfig b/arch/arm/kvm/Kconfig index 9f581b1..e519a40 100644 --- a/arch/arm/kvm/Kconfig +++ b/arch/arm/kvm/Kconfig @@ -24,6 +24,7 @@ config KVM select KVM_MMIO select KVM_ARM_HOST depends on ARM_VIRT_EXT && ARM_LPAE + select HAVE_KVM_EVENTFD ---help--- Support hosting virtualized guest machines. You will also need to select one or more of the processor modules below. @@ -55,6 +56,7 @@ config KVM_ARM_MAX_VCPUS config KVM_ARM_VGIC bool "KVM support for Virtual GIC" depends on KVM_ARM_HOST && OF + select HAVE_KVM_IRQFD default y ---help--- Adds support for a hardware assisted, in-kernel GIC emulation. diff --git a/arch/arm/kvm/Makefile b/arch/arm/kvm/Makefile index f7057ed..859db09 100644 --- a/arch/arm/kvm/Makefile +++ b/arch/arm/kvm/Makefile @@ -15,7 +15,7 @@ AFLAGS_init.o := -Wa,-march=armv7-a$(plus_virt) AFLAGS_interrupts.o := -Wa,-march=armv7-a$(plus_virt) KVM := ../../../virt/kvm -kvm-arm-y = $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o +kvm-arm-y = $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o $(KVM)/eventfd.o obj-y += kvm-arm.o init.o interrupts.o obj-y += arm.o handle_exit.o guest.o mmu.o emulate.o reset.o diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c index 9c905b4..8f8c1da 100644 --- a/arch/arm/kvm/arm.c +++ b/arch/arm/kvm/arm.c @@ -172,6 +172,11 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) case KVM_CAP_IRQCHIP: r = vgic_present; break; +#ifdef CONFIG_HAVE_KVM_IRQFD + case KVM_CAP_IRQFD: + r = vgic_present; + break; +#endif case KVM_CAP_DEVICE_CTRL: case KVM_CAP_USER_MEMORY: case KVM_CAP_SYNC_MMU: diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h index 480af34..b35c95a 100644 --- a/arch/arm64/include/uapi/asm/kvm.h +++ b/arch/arm64/include/uapi/asm/kvm.h @@ -184,6 +184,9 @@ struct kvm_arch_memory_slot { /* Highest supported SPI, from VGIC_NR_IRQS */ #define KVM_ARM_IRQ_GIC_MAX 127 +/* One single KVM irqchip, ie. the VGIC */ +#define KVM_NR_IRQCHIPS 1 + /* PSCI interface */ #define KVM_PSCI_FN_BASE 0x95c1ba5e #define KVM_PSCI_FN(n) (KVM_PSCI_FN_BASE + (n)) diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig index 279e1a0..09c25c2 100644 --- a/arch/arm64/kvm/Kconfig +++ b/arch/arm64/kvm/Kconfig @@ -26,6 +26,7 @@ config KVM select KVM_ARM_HOST select KVM_ARM_VGIC select KVM_ARM_TIMER + select HAVE_KVM_EVENTFD ---help--- Support hosting virtualized guest machines. @@ -50,6 +51,7 @@ config KVM_ARM_MAX_VCPUS config KVM_ARM_VGIC bool depends on KVM_ARM_HOST && OF + select HAVE_KVM_IRQFD ---help--- Adds support for a hardware assisted, in-kernel GIC emulation. diff --git a/arch/arm64/kvm/Makefile b/arch/arm64/kvm/Makefile index 32a0961..2e6b827 100644 --- a/arch/arm64/kvm/Makefile +++ b/arch/arm64/kvm/Makefile @@ -11,7 +11,7 @@ ARM=../../../arch/arm/kvm obj-$(CONFIG_KVM_ARM_HOST) += kvm.o -kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o +kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o $(KVM)/eventfd.o kvm-$(CONFIG_KVM_ARM_HOST) += $(ARM)/arm.o $(ARM)/mmu.o $(ARM)/mmio.o kvm-$(CONFIG_KVM_ARM_HOST) += $(ARM)/psci.o $(ARM)/perf.o diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c index c84f53df..afe70aa 100644 --- a/virt/kvm/arm/vgic.c +++ b/virt/kvm/arm/vgic.c @@ -1447,7 +1447,10 @@ epilog: static bool vgic_process_maintenance(struct kvm_vcpu *vcpu) { u32 status = vgic_get_interrupt_status(vcpu); + struct vgic_dist *dist = &vcpu->kvm->arch.vgic; bool level_pending = false; + struct kvm *kvm = vcpu->kvm; + bool has_notifier; kvm_debug("STATUS = %08x\n", status); @@ -1464,6 +1467,7 @@ static bool vgic_process_maintenance(struct kvm_vcpu *vcpu) struct vgic_lr vlr = vgic_get_lr(vcpu, lr); WARN_ON(vgic_irq_is_edge(vcpu, vlr.irq)); + spin_lock(&dist->lock); vgic_irq_clear_queued(vcpu, vlr.irq); WARN_ON(vlr.state & LR_STATE_MASK); vlr.state = 0; @@ -1482,6 +1486,24 @@ static bool vgic_process_maintenance(struct kvm_vcpu *vcpu) */ vgic_dist_irq_clear_soft_pend(vcpu, vlr.irq); + /* + * kvm_notify_acked_irq calls kvm_set_irq() + * to reset the IRQ level. Need to release the + * lock for kvm_set_irq to grab it. + */ + spin_unlock(&dist->lock); + + has_notifier = kvm_irq_has_notifier(kvm, 0, + vlr.irq - VGIC_NR_PRIVATE_IRQS); + + if (has_notifier) { + kvm_debug("Guest EOIed vIRQ %d on CPU %d\n", + vlr.irq, vcpu->vcpu_id); + kvm_notify_acked_irq(kvm, 0, + vlr.irq - VGIC_NR_PRIVATE_IRQS); + } + spin_lock(&dist->lock); + /* Any additional pending interrupt? */ if (vgic_dist_irq_get_level(vcpu, vlr.irq)) { vgic_cpu_irq_set(vcpu, vlr.irq); @@ -1491,6 +1513,8 @@ static bool vgic_process_maintenance(struct kvm_vcpu *vcpu) vgic_cpu_irq_clear(vcpu, vlr.irq); } + spin_unlock(&dist->lock); + /* * Despite being EOIed, the LR may not have * been marked as empty. @@ -1555,14 +1579,10 @@ void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu) void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu) { - struct vgic_dist *dist = &vcpu->kvm->arch.vgic; - if (!irqchip_in_kernel(vcpu->kvm)) return; - spin_lock(&dist->lock); __kvm_vgic_sync_hwstate(vcpu); - spin_unlock(&dist->lock); } int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu) @@ -2493,3 +2513,38 @@ out_free_irq: free_percpu_irq(vgic->maint_irq, kvm_get_running_vcpus()); return ret; } + +int kvm_irq_map_gsi(struct kvm *kvm, + struct kvm_kernel_irq_routing_entry *entries, + int gsi) +{ + return gsi; +} + +int kvm_irq_map_chip_pin(struct kvm *kvm, unsigned irqchip, unsigned pin) +{ + return pin; +} + +int kvm_set_irq(struct kvm *kvm, int irq_source_id, + u32 irq, int level, bool line_status) +{ + unsigned int spi = irq + VGIC_NR_PRIVATE_IRQS; + + kvm_debug("irqfd sets vIRQ %d to %d\n", irq, level); + + if (likely(vgic_initialized(kvm))) { + if (spi > kvm->arch.vgic.nr_irqs) + return -EINVAL; + return kvm_vgic_inject_irq(kvm, 0, spi, level); + } else + return -ENODEV; +} + +/* MSI not implemented yet */ +int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, + struct kvm *kvm, int irq_source_id, + int level, bool line_status) +{ + return 0; +}