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

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The priority 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.
There is a corner case when we change the priority of a pending
interrupt which we don't handle at the moment.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Andre Przywara 2015-12-01 14:34:02 +00:00 committed by Christoffer Dall
parent 69b6fe0c6e
commit 055658bf48
4 changed files with 50 additions and 1 deletions
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2
virt/kvm/arm/vgic/vgic-mmio-v2.c
View file

@ -90,7 +90,7 @@ static const struct vgic_register_region vgic_v2_dist_registers[] = {
vgic_mmio_read_active, vgic_mmio_write_cactive, 1,
VGIC_ACCESS_32bit),
REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_PRI,
vgic_mmio_read_raz, vgic_mmio_write_wi, 8,
vgic_mmio_read_priority, vgic_mmio_write_priority, 8,
VGIC_ACCESS_32bit | VGIC_ACCESS_8bit),
REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_TARGET,
vgic_mmio_read_raz, vgic_mmio_write_wi, 8,

40
virt/kvm/arm/vgic/vgic-mmio.c
View file

@ -236,6 +236,46 @@ void vgic_mmio_write_sactive(struct kvm_vcpu *vcpu,
}
}
unsigned long vgic_mmio_read_priority(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len)
{
u32 intid = VGIC_ADDR_TO_INTID(addr, 8);
int i;
u64 val = 0;
for (i = 0; i < len; i++) {
struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
val |= (u64)irq->priority << (i * 8);
}
return val;
}
/*
* We currently don't handle changing the priority of an interrupt that
* is already pending on a VCPU. If there is a need for this, we would
* need to make this VCPU exit and re-evaluate the priorities, potentially
* leading to this interrupt getting presented now to the guest (if it has
* been masked by the priority mask before).
*/
void vgic_mmio_write_priority(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len,
unsigned long val)
{
u32 intid = VGIC_ADDR_TO_INTID(addr, 8);
int i;
for (i = 0; i < len; i++) {
struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
spin_lock(&irq->irq_lock);
/* Narrow the priority range to what we actually support */
irq->priority = (val >> (i * 8)) & GENMASK(7, 8 - VGIC_PRI_BITS);
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

@ -129,6 +129,13 @@ void vgic_mmio_write_sactive(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len,
unsigned long val);
unsigned long vgic_mmio_read_priority(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len);
void vgic_mmio_write_priority(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

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

@ -19,6 +19,8 @@
#define PRODUCT_ID_KVM 0x4b /* ASCII code K */
#define IMPLEMENTER_ARM 0x43b
#define VGIC_PRI_BITS 5
#define vgic_irq_is_sgi(intid) ((intid) < VGIC_NR_SGIS)
struct vgic_irq *vgic_get_irq(struct kvm *kvm, struct kvm_vcpu *vcpu,