Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754326AbbHCPdn (ORCPT ); Mon, 3 Aug 2015 11:33:43 -0400 Received: from mail-wi0-f182.google.com ([209.85.212.182]:36165 "EHLO mail-wi0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754093AbbHCPc0 (ORCPT ); Mon, 3 Aug 2015 11:32:26 -0400 From: Eric Auger To: eric.auger@st.com, eric.auger@linaro.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, christoffer.dall@linaro.org, marc.zyngier@arm.com Cc: linux-kernel@vger.kernel.org, patches@linaro.org, pbonzini@redhat.com, andre.przywara@arm.com, p.fedin@samsung.com Subject: [PATCH v3 4/7] KVM: arm/arm64: enable irqchip routing Date: Mon, 3 Aug 2015 17:31:26 +0200 Message-Id: <1438615889-10892-5-git-send-email-eric.auger@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1438615889-10892-1-git-send-email-eric.auger@linaro.org> References: <1438615889-10892-1-git-send-email-eric.auger@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 9897 Lines: 313 This patch adds compilation and link against irqchip. On ARM, irqchip routing is not really useful since there is a single irqchip. However main motivation behind using irqchip code is to enable MSI routing code. With the support of in-kernel GICv3 ITS emulation, it now seems to be a MUST HAVE requirement. Functions previously implemented in vgic.c and substitute to more complex irqchip implementation are removed: - kvm_send_userspace_msi - kvm_irq_map_chip_pin - kvm_set_irq - kvm_irq_map_gsi. Routing standard hooks are now implemented in vgic: - kvm_set_routing_entry - kvm_set_irq - kvm_set_msi Both HAVE_KVM_IRQCHIP and HAVE_KVM_IRQ_ROUTING are defined. KVM_CAP_IRQ_ROUTING is advertised and KVM_SET_GSI_ROUTING is allowed. MSI routing setup is not yet allowed. Signed-off-by: Eric Auger --- v2 -> v3: - unconditionally set devid and KVM_MSI_VALID_DEVID flag as suggested by Andre (KVM_IRQ_ROUTING_EXTENDED_MSI type not used anymore) - vgic_irqfd_set_irq now is static - propagate flags - add comments v1 -> v2: - fix bug reported by Andre related to msi.flags and msi.devid setting in kvm_send_userspace_msi - avoid injecting reserved IRQ numbers in vgic_irqfd_set_irq RFC -> PATCH - reword api.txt: x move MSI routing comments in a subsequent patch, x clearly state GSI routing does not apply to KVM_IRQ_LINE Conflicts: include/kvm/arm_vgic.h virt/kvm/arm/vgic.c --- Documentation/virtual/kvm/api.txt | 12 ++++-- arch/arm/include/asm/kvm_host.h | 2 + arch/arm/kvm/Kconfig | 2 + arch/arm/kvm/Makefile | 2 +- arch/arm64/include/asm/kvm_host.h | 1 + arch/arm64/kvm/Kconfig | 2 + arch/arm64/kvm/Makefile | 2 +- include/kvm/arm_vgic.h | 2 - virt/kvm/arm/vgic.c | 82 ++++++++++++++++++++++++++++----------- virt/kvm/irqchip.c | 2 + 10 files changed, 78 insertions(+), 31 deletions(-) diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index d4b29df..b6913c9 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -1421,13 +1421,16 @@ KVM_ASSIGN_DEV_IRQ. Partial deassignment of host or guest IRQ is allowed. 4.52 KVM_SET_GSI_ROUTING Capability: KVM_CAP_IRQ_ROUTING -Architectures: x86 s390 +Architectures: x86 s390 arm arm64 Type: vm ioctl Parameters: struct kvm_irq_routing (in) Returns: 0 on success, -1 on error Sets the GSI routing table entries, overwriting any previously set entries. +On arm/arm64, GSI routing has the following limitation: +- GSI routing does not apply to KVM_IRQ_LINE but only to KVM_IRQFD. + struct kvm_irq_routing { __u32 nr; __u32 flags; @@ -2345,9 +2348,10 @@ 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. +On arm/arm64, gsi routing being supported, the following can happen: +- in case no routing entry is associated to this gsi, injection fails +- in case the gsi is associated to an irqchip routing entry, + irqchip.pin + 32 corresponds to the injected SPI ID. 4.76 KVM_PPC_ALLOCATE_HTAB diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h index 56cac05..8a68e9e 100644 --- a/arch/arm/include/asm/kvm_host.h +++ b/arch/arm/include/asm/kvm_host.h @@ -42,6 +42,8 @@ #define KVM_VCPU_MAX_FEATURES 2 +#define KVM_IRQCHIP_NUM_PINS 988 /* 1020 - 32 is the number of SPI */ + #include u32 *kvm_vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num, u32 mode); diff --git a/arch/arm/kvm/Kconfig b/arch/arm/kvm/Kconfig index bfb915d..151e710 100644 --- a/arch/arm/kvm/Kconfig +++ b/arch/arm/kvm/Kconfig @@ -31,6 +31,8 @@ config KVM select KVM_VFIO select HAVE_KVM_EVENTFD select HAVE_KVM_IRQFD + select HAVE_KVM_IRQCHIP + select HAVE_KVM_IRQ_ROUTING depends on ARM_VIRT_EXT && ARM_LPAE && ARM_ARCH_TIMER ---help--- Support hosting virtualized guest machines. diff --git a/arch/arm/kvm/Makefile b/arch/arm/kvm/Makefile index c5eef02c..1a8f48a 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)/eventfd.o $(KVM)/vfio.o +kvm-arm-y = $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o $(KVM)/eventfd.o $(KVM)/vfio.o $(KVM)/irqchip.o obj-y += kvm-arm.o init.o interrupts.o obj-y += arm.o handle_exit.o guest.o mmu.o emulate.o reset.o diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 8d78a72..38a3291 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -44,6 +44,7 @@ #include #define KVM_VCPU_MAX_FEATURES 3 +#define KVM_IRQCHIP_NUM_PINS 988 /* 1020 - 32 is the number of SPI */ int __attribute_const__ kvm_target_cpu(void); int kvm_reset_vcpu(struct kvm_vcpu *vcpu); diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig index ff9722f..1a9900d 100644 --- a/arch/arm64/kvm/Kconfig +++ b/arch/arm64/kvm/Kconfig @@ -32,6 +32,8 @@ config KVM select HAVE_KVM_EVENTFD select HAVE_KVM_IRQFD select HAVE_KVM_MSI + select HAVE_KVM_IRQCHIP + select HAVE_KVM_IRQ_ROUTING ---help--- Support hosting virtualized guest machines. diff --git a/arch/arm64/kvm/Makefile b/arch/arm64/kvm/Makefile index 9803307..90a08457 100644 --- a/arch/arm64/kvm/Makefile +++ b/arch/arm64/kvm/Makefile @@ -11,7 +11,7 @@ ARM=../../../arch/arm/kvm obj-$(CONFIG_KVM_ARM_HOST) += kvm.o -kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o $(KVM)/eventfd.o $(KVM)/vfio.o +kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o $(KVM)/eventfd.o $(KVM)/vfio.o $(KVM)/irqchip.o kvm-$(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/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h index f50081c..1b370a0 100644 --- a/include/kvm/arm_vgic.h +++ b/include/kvm/arm_vgic.h @@ -375,6 +375,4 @@ static inline int vgic_v3_probe(struct device_node *vgic_node, } #endif -int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi); - #endif diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c index 081a1ef..8114235 100644 --- a/virt/kvm/arm/vgic.c +++ b/virt/kvm/arm/vgic.c @@ -2215,42 +2215,78 @@ out_free_irq: return ret; } -int kvm_irq_map_gsi(struct kvm *kvm, - struct kvm_kernel_irq_routing_entry *entries, - int gsi) -{ - return 0; -} - -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) +/** + * vgic_irqfd_set_irq: inject the IRQ corresponding to the + * irqchip routing entry + * + * This is the entry point for irqfd IRQ injection + */ +static int vgic_irqfd_set_irq(struct kvm_kernel_irq_routing_entry *e, + struct kvm *kvm, int irq_source_id, + int level, bool line_status) { - unsigned int spi = irq + VGIC_NR_PRIVATE_IRQS; + unsigned int spi_id = e->irqchip.pin + VGIC_NR_PRIVATE_IRQS; - trace_kvm_set_irq(irq, level, irq_source_id); + trace_kvm_set_irq(spi_id, level, irq_source_id); BUG_ON(!vgic_initialized(kvm)); - return kvm_vgic_inject_irq(kvm, 0, spi, level); + if (spi_id > min(kvm->arch.vgic.nr_irqs, 1020)) + return -EINVAL; + return kvm_vgic_inject_irq(kvm, 0, spi_id, level); +} + +/** + * kvm_set_routing_entry: populate a kvm routing entry + * from a user routing entry + * + * @e: kvm kernel routing entry handle + * @ue: user api routing entry handle + * return 0 on success, -EINVAL on errors. + */ +int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e, + const struct kvm_irq_routing_entry *ue) +{ + int r = -EINVAL; + + switch (ue->type) { + case KVM_IRQ_ROUTING_IRQCHIP: + e->set = vgic_irqfd_set_irq; + e->irqchip.irqchip = ue->u.irqchip.irqchip; + e->irqchip.pin = ue->u.irqchip.pin; + if ((e->irqchip.pin >= KVM_IRQCHIP_NUM_PINS) || + (e->irqchip.irqchip >= KVM_NR_IRQCHIPS)) + goto out; + break; + default: + goto out; + } + r = 0; +out: + return r; } -/* MSI not implemented yet */ +/** + * kvm_set_msi: inject the MSI corresponding to the + * MSI routing entry + * + * This is the entry point for irqfd MSI injection + * and userspace MSI injection. + */ 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; -} + struct kvm_msi msi; + + msi.address_lo = e->msi.address_lo; + msi.address_hi = e->msi.address_hi; + msi.data = e->msi.data; + msi.flags = e->flags; + msi.devid = e->devid; -int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi) -{ if (kvm->arch.vgic.vm_ops.inject_msi) - return kvm->arch.vgic.vm_ops.inject_msi(kvm, msi); + return kvm->arch.vgic.vm_ops.inject_msi(kvm, &msi); else return -ENODEV; } diff --git a/virt/kvm/irqchip.c b/virt/kvm/irqchip.c index 75c9931..e1559d4 100644 --- a/virt/kvm/irqchip.c +++ b/virt/kvm/irqchip.c @@ -29,7 +29,9 @@ #include #include #include +#if !defined(CONFIG_ARM) && !defined(CONFIG_ARM64) #include "irq.h" +#endif struct kvm_irq_routing_table { int chip[KVM_NR_IRQCHIPS][KVM_IRQCHIP_NUM_PINS]; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/