From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andre Przywara Subject: [RFC PATCH 38/45] KVM: arm/arm64: vgic-new: vgic_init: implement kvm_vgic_hyp_init Date: Fri, 25 Mar 2016 02:05:01 +0000 Message-ID: <1458871508-17279-39-git-send-email-andre.przywara@arm.com> References: <1458871508-17279-1-git-send-email-andre.przywara@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org To: Christoffer Dall , Marc Zyngier , Eric Auger Return-path: In-Reply-To: <1458871508-17279-1-git-send-email-andre.przywara@arm.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu List-Id: kvm.vger.kernel.org From: Eric Auger Implements kvm_vgic_hyp_init and vgic_probe function. The vgic_global struct is enriched with new fields populated by those functions. Signed-off-by: Eric Auger Signed-off-by: Andre Przywara --- include/kvm/vgic/vgic.h | 1 + virt/kvm/arm/vgic/vgic-v2.c | 90 +++++++++++++++++++++++++++++++ virt/kvm/arm/vgic/vgic-v3.c | 74 +++++++++++++++++++++++++ virt/kvm/arm/vgic/vgic.h | 6 +++ virt/kvm/arm/vgic/vgic_init.c | 122 ++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 293 insertions(+) create mode 100644 virt/kvm/arm/vgic/vgic_init.c diff --git a/include/kvm/vgic/vgic.h b/include/kvm/vgic/vgic.h index c4102a0..1bc7b66 100644 --- a/include/kvm/vgic/vgic.h +++ b/include/kvm/vgic/vgic.h @@ -195,6 +195,7 @@ struct vgic_cpu { }; int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write); +int kvm_vgic_hyp_init(void); int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int intid, bool level); diff --git a/virt/kvm/arm/vgic/vgic-v2.c b/virt/kvm/arm/vgic/vgic-v2.c index fe6da47..0cb5c4f 100644 --- a/virt/kvm/arm/vgic/vgic-v2.c +++ b/virt/kvm/arm/vgic/vgic-v2.c @@ -17,6 +17,11 @@ #include #include #include +#include +#include +#include +#include +#include #include "vgic.h" @@ -228,3 +233,88 @@ void vgic_v2_irq_change_affinity(struct kvm *kvm, u32 intid, u8 new_targets) irq->target_vcpu = kvm_get_vcpu(kvm, target); spin_unlock(&irq->irq_lock); } + +/** + * vgic_v2_probe - probe for a GICv2 compatible interrupt controller in DT + * @node: pointer to the DT node + * + * Returns 0 if a GICv2 has been found, returns an error code otherwise + */ +int vgic_v2_probe(struct device_node *vgic_node) +{ + int ret; + struct resource vctrl_res; + struct resource vcpu_res; + + kvm_vgic_global_state.maint_irq = irq_of_parse_and_map(vgic_node, 0); + if (!kvm_vgic_global_state.maint_irq) { + kvm_err("error getting vgic maintenance irq from DT\n"); + ret = -ENXIO; + goto out; + } + + ret = of_address_to_resource(vgic_node, 2, &vctrl_res); + if (ret) { + kvm_err("Cannot obtain GICH resource\n"); + goto out; + } + + kvm_vgic_global_state.vctrl_base = of_iomap(vgic_node, 2); + if (!kvm_vgic_global_state.vctrl_base) { + kvm_err("Cannot ioremap GICH\n"); + ret = -ENOMEM; + goto out; + } + + kvm_vgic_global_state.nr_lr = + readl_relaxed(kvm_vgic_global_state.vctrl_base + GICH_VTR); + kvm_vgic_global_state.nr_lr = (kvm_vgic_global_state.nr_lr & 0x3f) + 1; + + ret = create_hyp_io_mappings(kvm_vgic_global_state.vctrl_base, + kvm_vgic_global_state.vctrl_base + + resource_size(&vctrl_res), + vctrl_res.start); + if (ret) { + kvm_err("Cannot map VCTRL into hyp\n"); + goto out_unmap; + } + + if (of_address_to_resource(vgic_node, 3, &vcpu_res)) { + kvm_err("Cannot obtain GICV resource\n"); + ret = -ENXIO; + goto out_unmap; + } + + if (!PAGE_ALIGNED(vcpu_res.start)) { + kvm_err("GICV physical address 0x%llx not page aligned\n", + (unsigned long long)vcpu_res.start); + ret = -ENXIO; + goto out_unmap; + } + + if (!PAGE_ALIGNED(resource_size(&vcpu_res))) { + kvm_err("GICV size 0x%llx not a multiple of page size 0x%lx\n", + (unsigned long long)resource_size(&vcpu_res), + PAGE_SIZE); + ret = -ENXIO; + goto out_unmap; + } + + kvm_vgic_global_state.can_emulate_gicv2 = true; + kvm_register_vgic_device(KVM_DEV_TYPE_ARM_VGIC_V2); + + kvm_vgic_global_state.vcpu_base = vcpu_res.start; + + kvm_info("%s@%llx IRQ%d\n", vgic_node->name, + vctrl_res.start, kvm_vgic_global_state.maint_irq); + + kvm_vgic_global_state.type = VGIC_V2; + kvm_vgic_global_state.max_gic_vcpus = VGIC_V2_MAX_CPUS; + goto out; + +out_unmap: + iounmap(kvm_vgic_global_state.vctrl_base); +out: + of_node_put(vgic_node); + return ret; +} diff --git a/virt/kvm/arm/vgic/vgic-v3.c b/virt/kvm/arm/vgic/vgic-v3.c index 04ef7f9..1a53141 100644 --- a/virt/kvm/arm/vgic/vgic-v3.c +++ b/virt/kvm/arm/vgic/vgic-v3.c @@ -16,9 +16,17 @@ #include #include #include +#include +#include +#include +#include +#include +#include #include "vgic.h" +static u32 ich_vtr_el2; + void vgic_v3_process_maintenance(struct kvm_vcpu *vcpu) { struct vgic_v3_cpu_if *cpuif = &vcpu->arch.vgic_cpu.vgic_v3; @@ -211,3 +219,69 @@ void vgic_v3_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcrp) vmcrp->bpr = (vmcr & ICH_VMCR_BPR0_MASK) >> ICH_VMCR_BPR0_SHIFT; vmcrp->pmr = (vmcr & ICH_VMCR_PMR_MASK) >> ICH_VMCR_PMR_SHIFT; } + +/** + * vgic_v3_probe - probe for a GICv3 compatible interrupt controller in DT + * @node: pointer to the DT node + * + * Returns 0 if a GICv3 has been found, returns an error code otherwise + */ +int vgic_v3_probe(struct device_node *vgic_node) +{ + int ret = 0; + u32 gicv_idx; + struct resource vcpu_res; + + kvm_vgic_global_state.maint_irq = irq_of_parse_and_map(vgic_node, 0); + if (!kvm_vgic_global_state.maint_irq) { + kvm_err("error getting vgic maintenance irq from DT\n"); + ret = -ENXIO; + goto out; + } + + ich_vtr_el2 = kvm_call_hyp(__vgic_v3_get_ich_vtr_el2); + + /* + * The ListRegs field is 5 bits, but there is a architectural + * maximum of 16 list registers. Just ignore bit 4... + */ + kvm_vgic_global_state.nr_lr = (ich_vtr_el2 & 0xf) + 1; + kvm_vgic_global_state.can_emulate_gicv2 = false; + + if (of_property_read_u32(vgic_node, "#redistributor-regions", + &gicv_idx)) + gicv_idx = 1; + + gicv_idx += 3; /* Also skip GICD, GICC, GICH */ + if (of_address_to_resource(vgic_node, gicv_idx, &vcpu_res)) { + kvm_info("GICv3: no GICV resource entry\n"); + kvm_vgic_global_state.vcpu_base = 0; + } else if (!PAGE_ALIGNED(vcpu_res.start)) { + pr_warn("GICV physical address 0x%llx not page aligned\n", + (unsigned long long)vcpu_res.start); + kvm_vgic_global_state.vcpu_base = 0; + } else if (!PAGE_ALIGNED(resource_size(&vcpu_res))) { + pr_warn("GICV size 0x%llx not a multiple of page size 0x%lx\n", + (unsigned long long)resource_size(&vcpu_res), + PAGE_SIZE); + kvm_vgic_global_state.vcpu_base = 0; + } else { + kvm_vgic_global_state.vcpu_base = vcpu_res.start; + kvm_vgic_global_state.can_emulate_gicv2 = true; + kvm_register_vgic_device(KVM_DEV_TYPE_ARM_VGIC_V2); + } + if (kvm_vgic_global_state.vcpu_base == 0) + kvm_info("disabling GICv2 emulation\n"); + kvm_register_vgic_device(KVM_DEV_TYPE_ARM_VGIC_V3); + + kvm_vgic_global_state.vctrl_base = NULL; + kvm_vgic_global_state.type = VGIC_V3; + kvm_vgic_global_state.max_gic_vcpus = VGIC_V3_MAX_CPUS; + + kvm_info("%s@%llx IRQ%d\n", vgic_node->name, + vcpu_res.start, kvm_vgic_global_state.maint_irq); + +out: + of_node_put(vgic_node); + return ret; +} diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h index c6d3ff6..31c9299a 100644 --- a/virt/kvm/arm/vgic/vgic.h +++ b/virt/kvm/arm/vgic/vgic.h @@ -38,6 +38,7 @@ int vgic_v2_dist_access(struct kvm_vcpu *vcpu, bool is_write, int vgic_v2_has_attr_regs(struct kvm_device *dev, struct kvm_device_attr *attr); void vgic_v2_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr); void vgic_v2_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr); +int vgic_v2_probe(struct device_node *vgic_node); #ifdef CONFIG_KVM_ARM_VGIC_V3 void vgic_v3_irq_change_affinity(struct kvm *kvm, u32 intid, u64 mpidr); @@ -51,6 +52,7 @@ int vgic_v3_redist_access(struct kvm_vcpu *vcpu, bool is_write, int offset, int len, void *val); void vgic_v3_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr); void vgic_v3_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr); +int vgic_v3_probe(struct device_node *vgic_node); #else static inline void vgic_v3_irq_change_affinity(struct kvm *kvm, u32 intid, u64 mpidr) @@ -96,6 +98,10 @@ void vgic_v3_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr) { } +static inline int vgic_v3_probe(struct device_node *vgic_node) +{ + return -ENODEV; +} #endif void vgic_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr); diff --git a/virt/kvm/arm/vgic/vgic_init.c b/virt/kvm/arm/vgic/vgic_init.c new file mode 100644 index 0000000..d7c50bb --- /dev/null +++ b/virt/kvm/arm/vgic/vgic_init.c @@ -0,0 +1,122 @@ +/* + * Copyright (C) 2015, 2016 ARM Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include "vgic.h" + +/* GENERIC PROBE */ + +static void vgic_init_maintenance_interrupt(void *info) +{ + enable_percpu_irq(kvm_vgic_global_state.maint_irq, 0); +} + +static int vgic_cpu_notify(struct notifier_block *self, + unsigned long action, void *cpu) +{ + switch (action) { + case CPU_STARTING: + case CPU_STARTING_FROZEN: + vgic_init_maintenance_interrupt(NULL); + break; + case CPU_DYING: + case CPU_DYING_FROZEN: + disable_percpu_irq(kvm_vgic_global_state.maint_irq); + break; + } + + return NOTIFY_OK; +} + +static struct notifier_block vgic_cpu_nb = { + .notifier_call = vgic_cpu_notify, +}; + +static irqreturn_t vgic_maintenance_handler(int irq, void *data) +{ + /* + * We cannot rely on the vgic maintenance interrupt to be + * delivered synchronously. This means we can only use it to + * exit the VM, and we perform the handling of EOIed + * interrupts on the exit path (see vgic_process_maintenance). + */ + return IRQ_HANDLED; +} + +static const struct of_device_id vgic_ids[] = { + { .compatible = "arm,cortex-a15-gic", .data = vgic_v2_probe, }, + { .compatible = "arm,cortex-a7-gic", .data = vgic_v2_probe, }, + { .compatible = "arm,gic-400", .data = vgic_v2_probe, }, + { .compatible = "arm,gic-v3", .data = vgic_v3_probe, }, + {}, +}; + +/** + * kvm_vgic_hyp_init: populates the kvm_vgic_global_state variable + * according to the host GIC model. Accordingly calls either + * vgic_v2/v3_probe which registers the KVM_DEVICE that can be + * instantiated by a guest later on . + */ +int kvm_vgic_hyp_init(void) +{ + const struct of_device_id *matched_id; + const int (*vgic_probe)(struct device_node *); + struct device_node *vgic_node; + int ret; + + vgic_node = of_find_matching_node_and_match(NULL, + vgic_ids, &matched_id); + if (!vgic_node) { + kvm_err("error: no compatible GIC node found\n"); + return -ENODEV; + } + + vgic_probe = matched_id->data; + ret = vgic_probe(vgic_node); + if (ret) + return ret; + + ret = request_percpu_irq(kvm_vgic_global_state.maint_irq, + vgic_maintenance_handler, + "vgic", kvm_get_running_vcpus()); + if (ret) { + kvm_err("Cannot register interrupt %d\n", + kvm_vgic_global_state.maint_irq); + return ret; + } + + ret = __register_cpu_notifier(&vgic_cpu_nb); + if (ret) { + kvm_err("Cannot register vgic CPU notifier\n"); + goto out_free_irq; + } + + on_each_cpu(vgic_init_maintenance_interrupt, NULL, 1); + + return 0; + +out_free_irq: + free_percpu_irq(kvm_vgic_global_state.maint_irq, + kvm_get_running_vcpus()); + return ret; +} -- 2.7.3 From mboxrd@z Thu Jan 1 00:00:00 1970 From: andre.przywara@arm.com (Andre Przywara) Date: Fri, 25 Mar 2016 02:05:01 +0000 Subject: [RFC PATCH 38/45] KVM: arm/arm64: vgic-new: vgic_init: implement kvm_vgic_hyp_init In-Reply-To: <1458871508-17279-1-git-send-email-andre.przywara@arm.com> References: <1458871508-17279-1-git-send-email-andre.przywara@arm.com> Message-ID: <1458871508-17279-39-git-send-email-andre.przywara@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Eric Auger Implements kvm_vgic_hyp_init and vgic_probe function. The vgic_global struct is enriched with new fields populated by those functions. Signed-off-by: Eric Auger Signed-off-by: Andre Przywara --- include/kvm/vgic/vgic.h | 1 + virt/kvm/arm/vgic/vgic-v2.c | 90 +++++++++++++++++++++++++++++++ virt/kvm/arm/vgic/vgic-v3.c | 74 +++++++++++++++++++++++++ virt/kvm/arm/vgic/vgic.h | 6 +++ virt/kvm/arm/vgic/vgic_init.c | 122 ++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 293 insertions(+) create mode 100644 virt/kvm/arm/vgic/vgic_init.c diff --git a/include/kvm/vgic/vgic.h b/include/kvm/vgic/vgic.h index c4102a0..1bc7b66 100644 --- a/include/kvm/vgic/vgic.h +++ b/include/kvm/vgic/vgic.h @@ -195,6 +195,7 @@ struct vgic_cpu { }; int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write); +int kvm_vgic_hyp_init(void); int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int intid, bool level); diff --git a/virt/kvm/arm/vgic/vgic-v2.c b/virt/kvm/arm/vgic/vgic-v2.c index fe6da47..0cb5c4f 100644 --- a/virt/kvm/arm/vgic/vgic-v2.c +++ b/virt/kvm/arm/vgic/vgic-v2.c @@ -17,6 +17,11 @@ #include #include #include +#include +#include +#include +#include +#include #include "vgic.h" @@ -228,3 +233,88 @@ void vgic_v2_irq_change_affinity(struct kvm *kvm, u32 intid, u8 new_targets) irq->target_vcpu = kvm_get_vcpu(kvm, target); spin_unlock(&irq->irq_lock); } + +/** + * vgic_v2_probe - probe for a GICv2 compatible interrupt controller in DT + * @node: pointer to the DT node + * + * Returns 0 if a GICv2 has been found, returns an error code otherwise + */ +int vgic_v2_probe(struct device_node *vgic_node) +{ + int ret; + struct resource vctrl_res; + struct resource vcpu_res; + + kvm_vgic_global_state.maint_irq = irq_of_parse_and_map(vgic_node, 0); + if (!kvm_vgic_global_state.maint_irq) { + kvm_err("error getting vgic maintenance irq from DT\n"); + ret = -ENXIO; + goto out; + } + + ret = of_address_to_resource(vgic_node, 2, &vctrl_res); + if (ret) { + kvm_err("Cannot obtain GICH resource\n"); + goto out; + } + + kvm_vgic_global_state.vctrl_base = of_iomap(vgic_node, 2); + if (!kvm_vgic_global_state.vctrl_base) { + kvm_err("Cannot ioremap GICH\n"); + ret = -ENOMEM; + goto out; + } + + kvm_vgic_global_state.nr_lr = + readl_relaxed(kvm_vgic_global_state.vctrl_base + GICH_VTR); + kvm_vgic_global_state.nr_lr = (kvm_vgic_global_state.nr_lr & 0x3f) + 1; + + ret = create_hyp_io_mappings(kvm_vgic_global_state.vctrl_base, + kvm_vgic_global_state.vctrl_base + + resource_size(&vctrl_res), + vctrl_res.start); + if (ret) { + kvm_err("Cannot map VCTRL into hyp\n"); + goto out_unmap; + } + + if (of_address_to_resource(vgic_node, 3, &vcpu_res)) { + kvm_err("Cannot obtain GICV resource\n"); + ret = -ENXIO; + goto out_unmap; + } + + if (!PAGE_ALIGNED(vcpu_res.start)) { + kvm_err("GICV physical address 0x%llx not page aligned\n", + (unsigned long long)vcpu_res.start); + ret = -ENXIO; + goto out_unmap; + } + + if (!PAGE_ALIGNED(resource_size(&vcpu_res))) { + kvm_err("GICV size 0x%llx not a multiple of page size 0x%lx\n", + (unsigned long long)resource_size(&vcpu_res), + PAGE_SIZE); + ret = -ENXIO; + goto out_unmap; + } + + kvm_vgic_global_state.can_emulate_gicv2 = true; + kvm_register_vgic_device(KVM_DEV_TYPE_ARM_VGIC_V2); + + kvm_vgic_global_state.vcpu_base = vcpu_res.start; + + kvm_info("%s@%llx IRQ%d\n", vgic_node->name, + vctrl_res.start, kvm_vgic_global_state.maint_irq); + + kvm_vgic_global_state.type = VGIC_V2; + kvm_vgic_global_state.max_gic_vcpus = VGIC_V2_MAX_CPUS; + goto out; + +out_unmap: + iounmap(kvm_vgic_global_state.vctrl_base); +out: + of_node_put(vgic_node); + return ret; +} diff --git a/virt/kvm/arm/vgic/vgic-v3.c b/virt/kvm/arm/vgic/vgic-v3.c index 04ef7f9..1a53141 100644 --- a/virt/kvm/arm/vgic/vgic-v3.c +++ b/virt/kvm/arm/vgic/vgic-v3.c @@ -16,9 +16,17 @@ #include #include #include +#include +#include +#include +#include +#include +#include #include "vgic.h" +static u32 ich_vtr_el2; + void vgic_v3_process_maintenance(struct kvm_vcpu *vcpu) { struct vgic_v3_cpu_if *cpuif = &vcpu->arch.vgic_cpu.vgic_v3; @@ -211,3 +219,69 @@ void vgic_v3_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcrp) vmcrp->bpr = (vmcr & ICH_VMCR_BPR0_MASK) >> ICH_VMCR_BPR0_SHIFT; vmcrp->pmr = (vmcr & ICH_VMCR_PMR_MASK) >> ICH_VMCR_PMR_SHIFT; } + +/** + * vgic_v3_probe - probe for a GICv3 compatible interrupt controller in DT + * @node: pointer to the DT node + * + * Returns 0 if a GICv3 has been found, returns an error code otherwise + */ +int vgic_v3_probe(struct device_node *vgic_node) +{ + int ret = 0; + u32 gicv_idx; + struct resource vcpu_res; + + kvm_vgic_global_state.maint_irq = irq_of_parse_and_map(vgic_node, 0); + if (!kvm_vgic_global_state.maint_irq) { + kvm_err("error getting vgic maintenance irq from DT\n"); + ret = -ENXIO; + goto out; + } + + ich_vtr_el2 = kvm_call_hyp(__vgic_v3_get_ich_vtr_el2); + + /* + * The ListRegs field is 5 bits, but there is a architectural + * maximum of 16 list registers. Just ignore bit 4... + */ + kvm_vgic_global_state.nr_lr = (ich_vtr_el2 & 0xf) + 1; + kvm_vgic_global_state.can_emulate_gicv2 = false; + + if (of_property_read_u32(vgic_node, "#redistributor-regions", + &gicv_idx)) + gicv_idx = 1; + + gicv_idx += 3; /* Also skip GICD, GICC, GICH */ + if (of_address_to_resource(vgic_node, gicv_idx, &vcpu_res)) { + kvm_info("GICv3: no GICV resource entry\n"); + kvm_vgic_global_state.vcpu_base = 0; + } else if (!PAGE_ALIGNED(vcpu_res.start)) { + pr_warn("GICV physical address 0x%llx not page aligned\n", + (unsigned long long)vcpu_res.start); + kvm_vgic_global_state.vcpu_base = 0; + } else if (!PAGE_ALIGNED(resource_size(&vcpu_res))) { + pr_warn("GICV size 0x%llx not a multiple of page size 0x%lx\n", + (unsigned long long)resource_size(&vcpu_res), + PAGE_SIZE); + kvm_vgic_global_state.vcpu_base = 0; + } else { + kvm_vgic_global_state.vcpu_base = vcpu_res.start; + kvm_vgic_global_state.can_emulate_gicv2 = true; + kvm_register_vgic_device(KVM_DEV_TYPE_ARM_VGIC_V2); + } + if (kvm_vgic_global_state.vcpu_base == 0) + kvm_info("disabling GICv2 emulation\n"); + kvm_register_vgic_device(KVM_DEV_TYPE_ARM_VGIC_V3); + + kvm_vgic_global_state.vctrl_base = NULL; + kvm_vgic_global_state.type = VGIC_V3; + kvm_vgic_global_state.max_gic_vcpus = VGIC_V3_MAX_CPUS; + + kvm_info("%s@%llx IRQ%d\n", vgic_node->name, + vcpu_res.start, kvm_vgic_global_state.maint_irq); + +out: + of_node_put(vgic_node); + return ret; +} diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h index c6d3ff6..31c9299a 100644 --- a/virt/kvm/arm/vgic/vgic.h +++ b/virt/kvm/arm/vgic/vgic.h @@ -38,6 +38,7 @@ int vgic_v2_dist_access(struct kvm_vcpu *vcpu, bool is_write, int vgic_v2_has_attr_regs(struct kvm_device *dev, struct kvm_device_attr *attr); void vgic_v2_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr); void vgic_v2_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr); +int vgic_v2_probe(struct device_node *vgic_node); #ifdef CONFIG_KVM_ARM_VGIC_V3 void vgic_v3_irq_change_affinity(struct kvm *kvm, u32 intid, u64 mpidr); @@ -51,6 +52,7 @@ int vgic_v3_redist_access(struct kvm_vcpu *vcpu, bool is_write, int offset, int len, void *val); void vgic_v3_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr); void vgic_v3_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr); +int vgic_v3_probe(struct device_node *vgic_node); #else static inline void vgic_v3_irq_change_affinity(struct kvm *kvm, u32 intid, u64 mpidr) @@ -96,6 +98,10 @@ void vgic_v3_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr) { } +static inline int vgic_v3_probe(struct device_node *vgic_node) +{ + return -ENODEV; +} #endif void vgic_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr); diff --git a/virt/kvm/arm/vgic/vgic_init.c b/virt/kvm/arm/vgic/vgic_init.c new file mode 100644 index 0000000..d7c50bb --- /dev/null +++ b/virt/kvm/arm/vgic/vgic_init.c @@ -0,0 +1,122 @@ +/* + * Copyright (C) 2015, 2016 ARM Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include "vgic.h" + +/* GENERIC PROBE */ + +static void vgic_init_maintenance_interrupt(void *info) +{ + enable_percpu_irq(kvm_vgic_global_state.maint_irq, 0); +} + +static int vgic_cpu_notify(struct notifier_block *self, + unsigned long action, void *cpu) +{ + switch (action) { + case CPU_STARTING: + case CPU_STARTING_FROZEN: + vgic_init_maintenance_interrupt(NULL); + break; + case CPU_DYING: + case CPU_DYING_FROZEN: + disable_percpu_irq(kvm_vgic_global_state.maint_irq); + break; + } + + return NOTIFY_OK; +} + +static struct notifier_block vgic_cpu_nb = { + .notifier_call = vgic_cpu_notify, +}; + +static irqreturn_t vgic_maintenance_handler(int irq, void *data) +{ + /* + * We cannot rely on the vgic maintenance interrupt to be + * delivered synchronously. This means we can only use it to + * exit the VM, and we perform the handling of EOIed + * interrupts on the exit path (see vgic_process_maintenance). + */ + return IRQ_HANDLED; +} + +static const struct of_device_id vgic_ids[] = { + { .compatible = "arm,cortex-a15-gic", .data = vgic_v2_probe, }, + { .compatible = "arm,cortex-a7-gic", .data = vgic_v2_probe, }, + { .compatible = "arm,gic-400", .data = vgic_v2_probe, }, + { .compatible = "arm,gic-v3", .data = vgic_v3_probe, }, + {}, +}; + +/** + * kvm_vgic_hyp_init: populates the kvm_vgic_global_state variable + * according to the host GIC model. Accordingly calls either + * vgic_v2/v3_probe which registers the KVM_DEVICE that can be + * instantiated by a guest later on . + */ +int kvm_vgic_hyp_init(void) +{ + const struct of_device_id *matched_id; + const int (*vgic_probe)(struct device_node *); + struct device_node *vgic_node; + int ret; + + vgic_node = of_find_matching_node_and_match(NULL, + vgic_ids, &matched_id); + if (!vgic_node) { + kvm_err("error: no compatible GIC node found\n"); + return -ENODEV; + } + + vgic_probe = matched_id->data; + ret = vgic_probe(vgic_node); + if (ret) + return ret; + + ret = request_percpu_irq(kvm_vgic_global_state.maint_irq, + vgic_maintenance_handler, + "vgic", kvm_get_running_vcpus()); + if (ret) { + kvm_err("Cannot register interrupt %d\n", + kvm_vgic_global_state.maint_irq); + return ret; + } + + ret = __register_cpu_notifier(&vgic_cpu_nb); + if (ret) { + kvm_err("Cannot register vgic CPU notifier\n"); + goto out_free_irq; + } + + on_each_cpu(vgic_init_maintenance_interrupt, NULL, 1); + + return 0; + +out_free_irq: + free_percpu_irq(kvm_vgic_global_state.maint_irq, + kvm_get_running_vcpus()); + return ret; +} -- 2.7.3