There is no point in accessing the HW when writing to any of the
ISENABLER/ICENABLER registers from userspace, as only the guest
should be allowed to change the HW state.
Introduce new userspace-specific accessors that deal solely with
the virtual state.
Reported-by: James Morse <james.morse@xxxxxxx>
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
---
virt/kvm/arm/vgic/vgic-mmio-v2.c | 6 +++--
virt/kvm/arm/vgic/vgic-mmio-v3.c | 16 +++++++-----
virt/kvm/arm/vgic/vgic-mmio.c | 42 ++++++++++++++++++++++++++++++++
virt/kvm/arm/vgic/vgic-mmio.h | 8 ++++++
4 files changed, 64 insertions(+), 8 deletions(-)
diff --git a/virt/kvm/arm/vgic/vgic-mmio-v2.c b/virt/kvm/arm/vgic/vgic-mmio-v2.c
index d63881f60e1a..f51c6e939c76 100644
--- a/virt/kvm/arm/vgic/vgic-mmio-v2.c
+++ b/virt/kvm/arm/vgic/vgic-mmio-v2.c
@@ -409,10 +409,12 @@ static const struct vgic_register_region vgic_v2_dist_registers[] = {
NULL, vgic_mmio_uaccess_write_v2_group, 1,
VGIC_ACCESS_32bit),
REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_ENABLE_SET,
- vgic_mmio_read_enable, vgic_mmio_write_senable, NULL, NULL, 1,
+ vgic_mmio_read_enable, vgic_mmio_write_senable,
+ NULL, vgic_uaccess_write_senable, 1,
VGIC_ACCESS_32bit),
REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_ENABLE_CLEAR,
- vgic_mmio_read_enable, vgic_mmio_write_cenable, NULL, NULL, 1,
+ vgic_mmio_read_enable, vgic_mmio_write_cenable,
+ NULL, vgic_uaccess_write_cenable, 1,
VGIC_ACCESS_32bit),
REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_PENDING_SET,
vgic_mmio_read_pending, vgic_mmio_write_spending, NULL, NULL, 1,
diff --git a/virt/kvm/arm/vgic/vgic-mmio-v3.c b/virt/kvm/arm/vgic/vgic-mmio-v3.c
index f2b37a081f26..416613f2400c 100644
--- a/virt/kvm/arm/vgic/vgic-mmio-v3.c
+++ b/virt/kvm/arm/vgic/vgic-mmio-v3.c
@@ -538,10 +538,12 @@ static const struct vgic_register_region vgic_v3_dist_registers[] = {
vgic_mmio_read_group, vgic_mmio_write_group, NULL, NULL, 1,
VGIC_ACCESS_32bit),
REGISTER_DESC_WITH_BITS_PER_IRQ_SHARED(GICD_ISENABLER,
- vgic_mmio_read_enable, vgic_mmio_write_senable, NULL, NULL, 1,
+ vgic_mmio_read_enable, vgic_mmio_write_senable,
+ NULL, vgic_uaccess_write_senable, 1,
VGIC_ACCESS_32bit),
REGISTER_DESC_WITH_BITS_PER_IRQ_SHARED(GICD_ICENABLER,
- vgic_mmio_read_enable, vgic_mmio_write_cenable, NULL, NULL, 1,
+ vgic_mmio_read_enable, vgic_mmio_write_cenable,
+ NULL, vgic_uaccess_write_cenable, 1,
VGIC_ACCESS_32bit),
REGISTER_DESC_WITH_BITS_PER_IRQ_SHARED(GICD_ISPENDR,
vgic_mmio_read_pending, vgic_mmio_write_spending,
@@ -609,11 +611,13 @@ static const struct vgic_register_region vgic_v3_rd_registers[] = {
REGISTER_DESC_WITH_LENGTH(SZ_64K + GICR_IGROUPR0,
vgic_mmio_read_group, vgic_mmio_write_group, 4,
VGIC_ACCESS_32bit),
- REGISTER_DESC_WITH_LENGTH(SZ_64K + GICR_ISENABLER0,
- vgic_mmio_read_enable, vgic_mmio_write_senable, 4,
+ REGISTER_DESC_WITH_LENGTH_UACCESS(SZ_64K + GICR_ISENABLER0,
+ vgic_mmio_read_enable, vgic_mmio_write_senable,
+ NULL, vgic_uaccess_write_senable, 4,
VGIC_ACCESS_32bit),
- REGISTER_DESC_WITH_LENGTH(SZ_64K + GICR_ICENABLER0,
- vgic_mmio_read_enable, vgic_mmio_write_cenable, 4,
+ REGISTER_DESC_WITH_LENGTH_UACCESS(SZ_64K + GICR_ICENABLER0,
+ vgic_mmio_read_enable, vgic_mmio_write_cenable,
+ NULL, vgic_uaccess_write_cenable, 4,
VGIC_ACCESS_32bit),
REGISTER_DESC_WITH_LENGTH_UACCESS(SZ_64K + GICR_ISPENDR0,
vgic_mmio_read_pending, vgic_mmio_write_spending,
diff --git a/virt/kvm/arm/vgic/vgic-mmio.c b/virt/kvm/arm/vgic/vgic-mmio.c
index b38e94e8f74a..6e30034d1464 100644
--- a/virt/kvm/arm/vgic/vgic-mmio.c
+++ b/virt/kvm/arm/vgic/vgic-mmio.c
@@ -184,6 +184,48 @@ void vgic_mmio_write_cenable(struct kvm_vcpu *vcpu,
}
}
+int vgic_uaccess_write_senable(struct kvm_vcpu *vcpu,
+ gpa_t addr, unsigned int len,
+ unsigned long val)
+{
+ u32 intid = VGIC_ADDR_TO_INTID(addr, 1);
+ int i;
+ unsigned long flags;
+
+ for_each_set_bit(i, &val, len * 8) {
+ struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+
+ raw_spin_lock_irqsave(&irq->irq_lock, flags);
+ irq->enabled = true;
+ vgic_queue_irq_unlock(vcpu->kvm, irq, flags);
+
+ vgic_put_irq(vcpu->kvm, irq);
+ }
+
+ return 0;
+}
+
+int vgic_uaccess_write_cenable(struct kvm_vcpu *vcpu,
+ gpa_t addr, unsigned int len,
+ unsigned long val)
+{
+ u32 intid = VGIC_ADDR_TO_INTID(addr, 1);
+ int i;
+ unsigned long flags;
+
+ for_each_set_bit(i, &val, len * 8) {
+ struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+
+ raw_spin_lock_irqsave(&irq->irq_lock, flags);
+ irq->enabled = false;
+ raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+
+ vgic_put_irq(vcpu->kvm, irq);
+ }
+
+ return 0;
+}
+
unsigned long vgic_mmio_read_pending(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len)
{
diff --git a/virt/kvm/arm/vgic/vgic-mmio.h b/virt/kvm/arm/vgic/vgic-mmio.h
index 30713a44e3fa..327d0a6938e4 100644
--- a/virt/kvm/arm/vgic/vgic-mmio.h
+++ b/virt/kvm/arm/vgic/vgic-mmio.h
@@ -138,6 +138,14 @@ void vgic_mmio_write_cenable(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len,
unsigned long val);
+int vgic_uaccess_write_senable(struct kvm_vcpu *vcpu,
+ gpa_t addr, unsigned int len,
+ unsigned long val);
+
+int vgic_uaccess_write_cenable(struct kvm_vcpu *vcpu,
+ gpa_t addr, unsigned int len,
+ unsigned long val);
+
unsigned long vgic_mmio_read_pending(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len);
--
2.26.1
