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KVM: arm/arm64: vgic: Implement KVM_DEV_ARM_VGIC_GRP_LEVEL_INFO ioctl

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Userspace requires to store and restore of line_level for
level triggered interrupts using ioctl KVM_DEV_ARM_VGIC_GRP_LEVEL_INFO.

Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Vijaya Kumar K <Vijaya.Kumar@cavium.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Vijaya Kumar K 2017-01-26 19:50:52 +05:30 committed by Marc Zyngier
parent d017d7b0bd
commit e96a006cb0
7 changed files with 131 additions and 1 deletions
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6
arch/arm/include/uapi/asm/kvm.h
View File

@ -191,6 +191,12 @@ struct kvm_arch_memory_slot {
#define KVM_DEV_ARM_VGIC_GRP_CTRL 4
#define KVM_DEV_ARM_VGIC_GRP_REDIST_REGS 5
#define KVM_DEV_ARM_VGIC_GRP_CPU_SYSREGS 6
#define KVM_DEV_ARM_VGIC_GRP_LEVEL_INFO 7
#define KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_SHIFT 10
#define KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_MASK \
(0x3fffffULL << KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_SHIFT)
#define KVM_DEV_ARM_VGIC_LINE_LEVEL_INTID_MASK 0x3ff
#define VGIC_LEVEL_INFO_LINE_LEVEL 0
#define KVM_DEV_ARM_VGIC_CTRL_INIT 0

6
arch/arm64/include/uapi/asm/kvm.h
View File

@ -211,6 +211,12 @@ struct kvm_arch_memory_slot {
#define KVM_DEV_ARM_VGIC_GRP_CTRL 4
#define KVM_DEV_ARM_VGIC_GRP_REDIST_REGS 5
#define KVM_DEV_ARM_VGIC_GRP_CPU_SYSREGS 6
#define KVM_DEV_ARM_VGIC_GRP_LEVEL_INFO 7
#define KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_SHIFT 10
#define KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_MASK \
(0x3fffffULL << KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_SHIFT)
#define KVM_DEV_ARM_VGIC_LINE_LEVEL_INTID_MASK 0x3ff
#define VGIC_LEVEL_INFO_LINE_LEVEL 0
#define KVM_DEV_ARM_VGIC_CTRL_INIT 0

45
virt/kvm/arm/vgic/vgic-kvm-device.c
View File

@ -512,6 +512,21 @@ static int vgic_v3_attr_regs_access(struct kvm_device *dev,
regid, reg);
break;
}
case KVM_DEV_ARM_VGIC_GRP_LEVEL_INFO: {
unsigned int info, intid;
info = (attr->attr & KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_MASK) >>
KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_SHIFT;
if (info == VGIC_LEVEL_INFO_LINE_LEVEL) {
intid = attr->attr &
KVM_DEV_ARM_VGIC_LINE_LEVEL_INTID_MASK;
ret = vgic_v3_line_level_info_uaccess(vcpu, is_write,
intid, reg);
} else {
ret = -EINVAL;
}
break;
}
default:
ret = -EINVAL;
break;
@ -554,6 +569,17 @@ static int vgic_v3_set_attr(struct kvm_device *dev,
return vgic_v3_attr_regs_access(dev, attr, &reg, true);
}
case KVM_DEV_ARM_VGIC_GRP_LEVEL_INFO: {
u32 __user *uaddr = (u32 __user *)(long)attr->addr;
u64 reg;
u32 tmp32;
if (get_user(tmp32, uaddr))
return -EFAULT;
reg = tmp32;
return vgic_v3_attr_regs_access(dev, attr, &reg, true);
}
}
return -ENXIO;
}
@ -589,8 +615,18 @@ static int vgic_v3_get_attr(struct kvm_device *dev,
return ret;
return put_user(reg, uaddr);
}
}
case KVM_DEV_ARM_VGIC_GRP_LEVEL_INFO: {
u32 __user *uaddr = (u32 __user *)(long)attr->addr;
u64 reg;
u32 tmp32;
ret = vgic_v3_attr_regs_access(dev, attr, &reg, false);
if (ret)
return ret;
tmp32 = reg;
return put_user(tmp32, uaddr);
}
}
return -ENXIO;
}
@ -611,6 +647,13 @@ static int vgic_v3_has_attr(struct kvm_device *dev,
return vgic_v3_has_attr_regs(dev, attr);
case KVM_DEV_ARM_VGIC_GRP_NR_IRQS:
return 0;
case KVM_DEV_ARM_VGIC_GRP_LEVEL_INFO: {
if (((attr->attr & KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_MASK) >>
KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_SHIFT) ==
VGIC_LEVEL_INFO_LINE_LEVEL)
return 0;
break;
}
case KVM_DEV_ARM_VGIC_GRP_CTRL:
switch (attr->attr) {
case KVM_DEV_ARM_VGIC_CTRL_INIT:

14
virt/kvm/arm/vgic/vgic-mmio-v3.c
View File

@ -803,3 +803,17 @@ int vgic_v3_redist_uaccess(struct kvm_vcpu *vcpu, bool is_write,
else
return vgic_uaccess(vcpu, &rd_dev, is_write, offset, val);
}
int vgic_v3_line_level_info_uaccess(struct kvm_vcpu *vcpu, bool is_write,
u32 intid, u64 *val)
{
if (intid % 32)
return -EINVAL;
if (is_write)
vgic_write_irq_line_level_info(vcpu, intid, *val);
else
*val = vgic_read_irq_line_level_info(vcpu, intid);
return 0;
}

54
virt/kvm/arm/vgic/vgic-mmio.c
View File

@ -362,6 +362,60 @@ void vgic_mmio_write_config(struct kvm_vcpu *vcpu,
}
}
u64 vgic_read_irq_line_level_info(struct kvm_vcpu *vcpu, u32 intid)
{
int i;
u64 val = 0;
int nr_irqs = vcpu->kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS;
for (i = 0; i < 32; i++) {
struct vgic_irq *irq;
if ((intid + i) < VGIC_NR_SGIS || (intid + i) >= nr_irqs)
continue;
irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
if (irq->config == VGIC_CONFIG_LEVEL && irq->line_level)
val |= (1U << i);
vgic_put_irq(vcpu->kvm, irq);
}
return val;
}
void vgic_write_irq_line_level_info(struct kvm_vcpu *vcpu, u32 intid,
const u64 val)
{
int i;
int nr_irqs = vcpu->kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS;
for (i = 0; i < 32; i++) {
struct vgic_irq *irq;
bool new_level;
if ((intid + i) < VGIC_NR_SGIS || (intid + i) >= nr_irqs)
continue;
irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
/*
* Line level is set irrespective of irq type
* (level or edge) to avoid dependency that VM should
* restore irq config before line level.
*/
new_level = !!(val & (1U << i));
spin_lock(&irq->irq_lock);
irq->line_level = new_level;
if (new_level)
vgic_queue_irq_unlock(vcpu->kvm, irq);
else
spin_unlock(&irq->irq_lock);
vgic_put_irq(vcpu->kvm, irq);
}
}
static int match_region(const void *key, const void *elt)
{
const unsigned int offset = (unsigned long)key;

5
virt/kvm/arm/vgic/vgic-mmio.h
View File

@ -177,6 +177,11 @@ void vgic_mmio_write_config(struct kvm_vcpu *vcpu,
int vgic_uaccess(struct kvm_vcpu *vcpu, struct vgic_io_device *dev,
bool is_write, int offset, u32 *val);
u64 vgic_read_irq_line_level_info(struct kvm_vcpu *vcpu, u32 intid);
void vgic_write_irq_line_level_info(struct kvm_vcpu *vcpu, u32 intid,
const u64 val);
unsigned int vgic_v2_init_dist_iodev(struct vgic_io_device *dev);
unsigned int vgic_v3_init_dist_iodev(struct vgic_io_device *dev);

2
virt/kvm/arm/vgic/vgic.h
View File

@ -164,6 +164,8 @@ int vgic_v3_cpu_sysregs_uaccess(struct kvm_vcpu *vcpu, bool is_write,
u64 id, u64 *val);
int vgic_v3_has_cpu_sysregs_attr(struct kvm_vcpu *vcpu, bool is_write, u64 id,
u64 *reg);
int vgic_v3_line_level_info_uaccess(struct kvm_vcpu *vcpu, bool is_write,
u32 intid, u64 *val);
int kvm_register_vgic_device(unsigned long type);
void vgic_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
void vgic_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);