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KVM: arm/arm64: vgic-new: Add CTLR, TYPER and IIDR handlers

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Those three registers are v2 emulation specific, so their implementation
lives entirely in vgic-mmio-v2.c. Also they are handled in one function,
as their implementation is pretty simple.
When the guest enables the distributor, we kick all VCPUs to get
potentially pending interrupts serviced.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Marc Zyngier 2016-04-26 11:06:47 +01:00 committed by Christoffer Dall
parent fb848db396
commit 2b0cda8789
4 changed files with 65 additions and 1 deletions
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1
include/linux/irqchip/arm-gic.h
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@ -33,6 +33,7 @@
#define GIC_DIST_CTRL 0x000
#define GIC_DIST_CTR 0x004
#define GIC_DIST_IIDR 0x008
#define GIC_DIST_IGROUP 0x080
#define GIC_DIST_ENABLE_SET 0x100
#define GIC_DIST_ENABLE_CLEAR 0x180

46
virt/kvm/arm/vgic/vgic-mmio-v2.c
View File

@ -20,9 +20,53 @@
#include "vgic.h"
#include "vgic-mmio.h"
static unsigned long vgic_mmio_read_v2_misc(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len)
{
u32 value;
switch (addr & 0x0c) {
case GIC_DIST_CTRL:
value = vcpu->kvm->arch.vgic.enabled ? GICD_ENABLE : 0;
break;
case GIC_DIST_CTR:
value = vcpu->kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS;
value = (value >> 5) - 1;
value |= (atomic_read(&vcpu->kvm->online_vcpus) - 1) << 5;
break;
case GIC_DIST_IIDR:
value = (PRODUCT_ID_KVM << 24) | (IMPLEMENTER_ARM << 0);
break;
default:
return 0;
}
return value;
}
static void vgic_mmio_write_v2_misc(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len,
unsigned long val)
{
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
bool was_enabled = dist->enabled;
switch (addr & 0x0c) {
case GIC_DIST_CTRL:
dist->enabled = val & GICD_ENABLE;
if (!was_enabled && dist->enabled)
vgic_kick_vcpus(vcpu->kvm);
break;
case GIC_DIST_CTR:
case GIC_DIST_IIDR:
/* Nothing to do */
return;
}
}
static const struct vgic_register_region vgic_v2_dist_registers[] = {
REGISTER_DESC_WITH_LENGTH(GIC_DIST_CTRL,
vgic_mmio_read_raz, vgic_mmio_write_wi, 12,
vgic_mmio_read_v2_misc, vgic_mmio_write_v2_misc, 12,
VGIC_ACCESS_32bit),
REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_IGROUP,
vgic_mmio_read_rao, vgic_mmio_write_wi, 1,

15
virt/kvm/arm/vgic/vgic.c
View File

@ -545,3 +545,18 @@ int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu)
return pending;
}
void vgic_kick_vcpus(struct kvm *kvm)
{
struct kvm_vcpu *vcpu;
int c;
/*
* We've injected an interrupt, time to find out who deserves
* a good kick...
*/
kvm_for_each_vcpu(c, vcpu, kvm) {
if (kvm_vgic_vcpu_pending_irq(vcpu))
kvm_vcpu_kick(vcpu);
}
}

4
virt/kvm/arm/vgic/vgic.h
View File

@ -16,11 +16,15 @@
#ifndef __KVM_ARM_VGIC_NEW_H__
#define __KVM_ARM_VGIC_NEW_H__
#define PRODUCT_ID_KVM 0x4b /* ASCII code K */
#define IMPLEMENTER_ARM 0x43b
#define vgic_irq_is_sgi(intid) ((intid) < VGIC_NR_SGIS)
struct vgic_irq *vgic_get_irq(struct kvm *kvm, struct kvm_vcpu *vcpu,
u32 intid);
bool vgic_queue_irq_unlock(struct kvm *kvm, struct vgic_irq *irq);
void vgic_kick_vcpus(struct kvm *kvm);
void vgic_v2_process_maintenance(struct kvm_vcpu *vcpu);
void vgic_v2_fold_lr_state(struct kvm_vcpu *vcpu);