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KVM: arm/arm64: vgic: Rely on the GIC driver to parse the firmware tables

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Currently, the firmware tables are parsed 2 times: once in the GIC
drivers, the other time when initializing the vGIC. It means code
duplication and make more tedious to add the support for another
firmware table (like ACPI).

Use the recently introduced helper gic_get_kvm_info() to get
information about the virtual GIC.

With this change, the virtual GIC becomes agnostic to the firmware
table and KVM will be able to initialize the vGIC on ACPI.

Signed-off-by: Julien Grall <julien.grall@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Julien Grall 2016-04-11 16:32:59 +01:00 committed by Christoffer Dall
parent 29c2d6ff4c
commit 503a62862e
4 changed files with 77 additions and 96 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
include/kvm/arm_vgic.h
View File

@ -25,6 +25,7 @@
#include <linux/spinlock.h>
#include <linux/types.h>
#include <kvm/iodev.h>
#include <linux/irqchip/arm-gic-common.h>
#define VGIC_NR_IRQS_LEGACY 256
#define VGIC_NR_SGIS 16
@ -353,15 +354,15 @@ bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, struct irq_phys_map *map);
#define vgic_initialized(k) (!!((k)->arch.vgic.nr_cpus))
#define vgic_ready(k) ((k)->arch.vgic.ready)
int vgic_v2_probe(struct device_node *vgic_node,
int vgic_v2_probe(const struct gic_kvm_info *gic_kvm_info,
const struct vgic_ops **ops,
const struct vgic_params **params);
#ifdef CONFIG_KVM_ARM_VGIC_V3
int vgic_v3_probe(struct device_node *vgic_node,
int vgic_v3_probe(const struct gic_kvm_info *gic_kvm_info,
const struct vgic_ops **ops,
const struct vgic_params **params);
#else
static inline int vgic_v3_probe(struct device_node *vgic_node,
static inline int vgic_v3_probe(const struct gic_kvm_info *gic_kvm_info,
const struct vgic_ops **ops,
const struct vgic_params **params)
{

67
virt/kvm/arm/vgic-v2.c
View File

@ -20,9 +20,6 @@
#include <linux/kvm_host.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/irqchip/arm-gic.h>
@ -186,38 +183,39 @@ static void vgic_cpu_init_lrs(void *params)
}
/**
* vgic_v2_probe - probe for a GICv2 compatible interrupt controller in DT
* @node: pointer to the DT node
* @ops: address of a pointer to the GICv2 operations
* @params: address of a pointer to HW-specific parameters
* vgic_v2_probe - probe for a GICv2 compatible interrupt controller
* @gic_kvm_info: pointer to the GIC description
* @ops: address of a pointer to the GICv2 operations
* @params: address of a pointer to HW-specific parameters
*
* Returns 0 if a GICv2 has been found, with the low level operations
* in *ops and the HW parameters in *params. Returns an error code
* otherwise.
*/
int vgic_v2_probe(struct device_node *vgic_node,
const struct vgic_ops **ops,
const struct vgic_params **params)
int vgic_v2_probe(const struct gic_kvm_info *gic_kvm_info,
const struct vgic_ops **ops,
const struct vgic_params **params)
{
int ret;
struct resource vctrl_res;
struct resource vcpu_res;
struct vgic_params *vgic = &vgic_v2_params;
const struct resource *vctrl_res = &gic_kvm_info->vctrl;
const struct resource *vcpu_res = &gic_kvm_info->vcpu;
vgic->maint_irq = irq_of_parse_and_map(vgic_node, 0);
if (!vgic->maint_irq) {
kvm_err("error getting vgic maintenance irq from DT\n");
if (!gic_kvm_info->maint_irq) {
kvm_err("error getting vgic maintenance irq\n");
ret = -ENXIO;
goto out;
}
vgic->maint_irq = gic_kvm_info->maint_irq;
if (!gic_kvm_info->vctrl.start) {
kvm_err("GICH not present in the firmware table\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;
}
vgic->vctrl_base = of_iomap(vgic_node, 2);
vgic->vctrl_base = ioremap(gic_kvm_info->vctrl.start,
resource_size(&gic_kvm_info->vctrl));
if (!vgic->vctrl_base) {
kvm_err("Cannot ioremap GICH\n");
ret = -ENOMEM;
@ -228,29 +226,23 @@ int vgic_v2_probe(struct device_node *vgic_node,
vgic->nr_lr = (vgic->nr_lr & 0x3f) + 1;
ret = create_hyp_io_mappings(vgic->vctrl_base,
vgic->vctrl_base + resource_size(&vctrl_res),
vctrl_res.start);
vgic->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)) {
if (!PAGE_ALIGNED(vcpu_res->start)) {
kvm_err("GICV physical address 0x%llx not page aligned\n",
(unsigned long long)vcpu_res.start);
(unsigned long long)vcpu_res->start);
ret = -ENXIO;
goto out_unmap;
}
if (!PAGE_ALIGNED(resource_size(&vcpu_res))) {
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),
(unsigned long long)resource_size(vcpu_res),
PAGE_SIZE);
ret = -ENXIO;
goto out_unmap;
@ -259,10 +251,10 @@ int vgic_v2_probe(struct device_node *vgic_node,
vgic->can_emulate_gicv2 = true;
kvm_register_device_ops(&kvm_arm_vgic_v2_ops, KVM_DEV_TYPE_ARM_VGIC_V2);
vgic->vcpu_base = vcpu_res.start;
vgic->vcpu_base = vcpu_res->start;
kvm_info("%s@%llx IRQ%d\n", vgic_node->name,
vctrl_res.start, vgic->maint_irq);
kvm_info("GICH base=0x%llx, GICV base=0x%llx, IRQ=%d\n",
gic_kvm_info->vctrl.start, vgic->vcpu_base, vgic->maint_irq);
vgic->type = VGIC_V2;
vgic->max_gic_vcpus = VGIC_V2_MAX_CPUS;
@ -276,6 +268,5 @@ int vgic_v2_probe(struct device_node *vgic_node,
out_unmap:
iounmap(vgic->vctrl_base);
out:
of_node_put(vgic_node);
return ret;
}

47
virt/kvm/arm/vgic-v3.c
View File

@ -20,11 +20,9 @@
#include <linux/kvm_host.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/irqchip/arm-gic-v3.h>
#include <linux/irqchip/arm-gic-common.h>
#include <asm/kvm_emulate.h>
#include <asm/kvm_arm.h>
@ -222,30 +220,24 @@ static void vgic_cpu_init_lrs(void *params)
}
/**
* vgic_v3_probe - probe for a GICv3 compatible interrupt controller in DT
* @node: pointer to the DT node
* @ops: address of a pointer to the GICv3 operations
* @params: address of a pointer to HW-specific parameters
* vgic_v3_probe - probe for a GICv3 compatible interrupt controller
* @gic_kvm_info: pointer to the GIC description
* @ops: address of a pointer to the GICv3 operations
* @params: address of a pointer to HW-specific parameters
*
* Returns 0 if a GICv3 has been found, with the low level operations
* in *ops and the HW parameters in *params. Returns an error code
* otherwise.
*/
int vgic_v3_probe(struct device_node *vgic_node,
int vgic_v3_probe(const struct gic_kvm_info *gic_kvm_info,
const struct vgic_ops **ops,
const struct vgic_params **params)
{
int ret = 0;
u32 gicv_idx;
struct resource vcpu_res;
struct vgic_params *vgic = &vgic_v3_params;
const struct resource *vcpu_res = &gic_kvm_info->vcpu;
vgic->maint_irq = irq_of_parse_and_map(vgic_node, 0);
if (!vgic->maint_irq) {
kvm_err("error getting vgic maintenance irq from DT\n");
ret = -ENXIO;
goto out;
}
vgic->maint_irq = gic_kvm_info->maint_irq;
ich_vtr_el2 = kvm_call_hyp(__vgic_v3_get_ich_vtr_el2);
@ -256,24 +248,19 @@ int vgic_v3_probe(struct device_node *vgic_node,
vgic->nr_lr = (ich_vtr_el2 & 0xf) + 1;
vgic->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)) {
if (!vcpu_res->start) {
kvm_info("GICv3: no GICV resource entry\n");
vgic->vcpu_base = 0;
} else if (!PAGE_ALIGNED(vcpu_res.start)) {
} else if (!PAGE_ALIGNED(vcpu_res->start)) {
pr_warn("GICV physical address 0x%llx not page aligned\n",
(unsigned long long)vcpu_res.start);
(unsigned long long)vcpu_res->start);
vgic->vcpu_base = 0;
} else if (!PAGE_ALIGNED(resource_size(&vcpu_res))) {
} 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),
(unsigned long long)resource_size(vcpu_res),
PAGE_SIZE);
vgic->vcpu_base = 0;
} else {
vgic->vcpu_base = vcpu_res.start;
vgic->vcpu_base = vcpu_res->start;
vgic->can_emulate_gicv2 = true;
kvm_register_device_ops(&kvm_arm_vgic_v2_ops,
KVM_DEV_TYPE_ARM_VGIC_V2);
@ -286,15 +273,13 @@ int vgic_v3_probe(struct device_node *vgic_node,
vgic->type = VGIC_V3;
vgic->max_gic_vcpus = VGIC_V3_MAX_CPUS;
kvm_info("%s@%llx IRQ%d\n", vgic_node->name,
vcpu_res.start, vgic->maint_irq);
kvm_info("GICV base=0x%llx, IRQ=%d\n",
vgic->vcpu_base, vgic->maint_irq);
on_each_cpu(vgic_cpu_init_lrs, vgic, 1);
*ops = &vgic_v3_ops;
*params = vgic;
out:
of_node_put(vgic_node);
return ret;
}

52
virt/kvm/arm/vgic.c
View File

@ -21,9 +21,7 @@
#include <linux/kvm_host.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/irq.h>
#include <linux/rculist.h>
#include <linux/uaccess.h>
@ -33,6 +31,7 @@
#include <trace/events/kvm.h>
#include <asm/kvm.h>
#include <kvm/iodev.h>
#include <linux/irqchip/arm-gic-common.h>
#define CREATE_TRACE_POINTS
#include "trace.h"
@ -2389,33 +2388,38 @@ static struct notifier_block vgic_cpu_nb = {
.notifier_call = vgic_cpu_notify,
};
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, },
{},
};
static int kvm_vgic_probe(void)
{
const struct gic_kvm_info *gic_kvm_info;
int ret;
gic_kvm_info = gic_get_kvm_info();
if (!gic_kvm_info)
return -ENODEV;
switch (gic_kvm_info->type) {
case GIC_V2:
ret = vgic_v2_probe(gic_kvm_info, &vgic_ops, &vgic);
break;
case GIC_V3:
ret = vgic_v3_probe(gic_kvm_info, &vgic_ops, &vgic);
break;
default:
ret = -ENODEV;
}
return ret;
}
int kvm_vgic_hyp_init(void)
{
const struct of_device_id *matched_id;
const int (*vgic_probe)(struct device_node *,const struct vgic_ops **,
const struct vgic_params **);
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, &vgic_ops, &vgic);
if (ret)
ret = kvm_vgic_probe();
if (ret) {
kvm_err("error: KVM vGIC probing failed\n");
return ret;
}
ret = request_percpu_irq(vgic->maint_irq, vgic_maintenance_handler,
"vgic", kvm_get_running_vcpus());