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KVM: arm/arm64: vgic-new: Add CONFIG registers handlers

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The config register handlers are shared between the v2 and v3
emulation, so their implementation goes into vgic-mmio.c, to be
easily referenced from the v3 emulation as well later.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
This commit is contained in:
Andre Przywara 2015-12-01 12:41:31 +00:00 committed by Christoffer Dall
parent 055658bf48
commit 79717e4ac0
3 changed files with 55 additions and 1 deletions
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2
virt/kvm/arm/vgic/vgic-mmio-v2.c
View File

@ -96,7 +96,7 @@ static const struct vgic_register_region vgic_v2_dist_registers[] = {
vgic_mmio_read_raz, vgic_mmio_write_wi, 8,
VGIC_ACCESS_32bit | VGIC_ACCESS_8bit),
REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_CONFIG,
vgic_mmio_read_raz, vgic_mmio_write_wi, 2,
vgic_mmio_read_config, vgic_mmio_write_config, 2,
VGIC_ACCESS_32bit),
REGISTER_DESC_WITH_LENGTH(GIC_DIST_SOFTINT,
vgic_mmio_read_raz, vgic_mmio_write_wi, 4,

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

@ -276,6 +276,53 @@ void vgic_mmio_write_priority(struct kvm_vcpu *vcpu,
}
}
unsigned long vgic_mmio_read_config(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len)
{
u32 intid = VGIC_ADDR_TO_INTID(addr, 2);
u32 value = 0;
int i;
for (i = 0; i < len * 4; i++) {
struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
if (irq->config == VGIC_CONFIG_EDGE)
value |= (2U << (i * 2));
}
return value;
}
void vgic_mmio_write_config(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len,
unsigned long val)
{
u32 intid = VGIC_ADDR_TO_INTID(addr, 2);
int i;
for (i = 0; i < len * 4; i++) {
struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
/*
* The configuration cannot be changed for SGIs in general,
* for PPIs this is IMPLEMENTATION DEFINED. The arch timer
* code relies on PPIs being level triggered, so we also
* make them read-only here.
*/
if (intid + i < VGIC_NR_PRIVATE_IRQS)
continue;
spin_lock(&irq->irq_lock);
if (test_bit(i * 2 + 1, &val)) {
irq->config = VGIC_CONFIG_EDGE;
} else {
irq->config = VGIC_CONFIG_LEVEL;
irq->pending = irq->line_level | irq->soft_pending;
}
spin_unlock(&irq->irq_lock);
}
}
static int match_region(const void *key, const void *elt)
{
const unsigned int offset = (unsigned long)key;

7
virt/kvm/arm/vgic/vgic-mmio.h
View File

@ -136,6 +136,13 @@ void vgic_mmio_write_priority(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len,
unsigned long val);
unsigned long vgic_mmio_read_config(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len);
void vgic_mmio_write_config(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len,
unsigned long val);
unsigned int vgic_v2_init_dist_iodev(struct vgic_io_device *dev);
#endif