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KVM: arm64: vgic-its: Implement vgic_its_has_attr_regs and attr_regs_access

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This patch implements vgic_its_has_attr_regs and vgic_its_attr_regs_access
upon the MMIO framework. VGIC ITS KVM device KVM_DEV_ARM_VGIC_GRP_ITS_REGS
group becomes functional.

At least GITS_CREADR and GITS_IIDR require to differentiate a guest write
action from a user access. As such let's introduce a new uaccess_its_write
vgic_register_region callback.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Christoffer Dall <cdall@linaro.org>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Eric Auger 2016-12-20 09:33:13 +01:00 committed by Christoffer Dall
parent dfc99f85c0
commit 8331c23c28
2 changed files with 84 additions and 4 deletions
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79
virt/kvm/arm/vgic/vgic-its.c
View file

@ -1469,14 +1469,89 @@ static void vgic_its_destroy(struct kvm_device *kvm_dev)
int vgic_its_has_attr_regs(struct kvm_device *dev,
struct kvm_device_attr *attr)
{
return -ENXIO;
const struct vgic_register_region *region;
gpa_t offset = attr->attr;
int align;
align = (offset < GITS_TYPER) || (offset >= GITS_PIDR4) ? 0x3 : 0x7;
if (offset & align)
return -EINVAL;
region = vgic_find_mmio_region(its_registers,
ARRAY_SIZE(its_registers),
offset);
if (!region)
return -ENXIO;
return 0;
}
int vgic_its_attr_regs_access(struct kvm_device *dev,
struct kvm_device_attr *attr,
u64 *reg, bool is_write)
{
return -ENXIO;
const struct vgic_register_region *region;
struct vgic_its *its;
gpa_t addr, offset;
unsigned int len;
int align, ret = 0;
its = dev->private;
offset = attr->attr;
/*
* Although the spec supports upper/lower 32-bit accesses to
* 64-bit ITS registers, the userspace ABI requires 64-bit
* accesses to all 64-bit wide registers. We therefore only
* support 32-bit accesses to GITS_CTLR, GITS_IIDR and GITS ID
* registers
*/
if ((offset < GITS_TYPER) || (offset >= GITS_PIDR4))
align = 0x3;
else
align = 0x7;
if (offset & align)
return -EINVAL;
mutex_lock(&dev->kvm->lock);
if (IS_VGIC_ADDR_UNDEF(its->vgic_its_base)) {
ret = -ENXIO;
goto out;
}
region = vgic_find_mmio_region(its_registers,
ARRAY_SIZE(its_registers),
offset);
if (!region) {
ret = -ENXIO;
goto out;
}
if (!lock_all_vcpus(dev->kvm)) {
ret = -EBUSY;
goto out;
}
addr = its->vgic_its_base + offset;
len = region->access_flags & VGIC_ACCESS_64bit ? 8 : 4;
if (is_write) {
if (region->uaccess_its_write)
ret = region->uaccess_its_write(dev->kvm, its, addr,
len, *reg);
else
region->its_write(dev->kvm, its, addr, len, *reg);
} else {
*reg = region->its_read(dev->kvm, its, addr, len);
}
unlock_all_vcpus(dev->kvm);
out:
mutex_unlock(&dev->kvm->lock);
return ret;
}
static int vgic_its_has_attr(struct kvm_device *dev,

9
virt/kvm/arm/vgic/vgic-mmio.h
View file

@ -36,8 +36,13 @@ struct vgic_register_region {
};
unsigned long (*uaccess_read)(struct kvm_vcpu *vcpu, gpa_t addr,
unsigned int len);
void (*uaccess_write)(struct kvm_vcpu *vcpu, gpa_t addr,
unsigned int len, unsigned long val);
union {
void (*uaccess_write)(struct kvm_vcpu *vcpu, gpa_t addr,
unsigned int len, unsigned long val);
int (*uaccess_its_write)(struct kvm *kvm, struct vgic_its *its,
gpa_t addr, unsigned int len,
unsigned long val);
};
};
extern struct kvm_io_device_ops kvm_io_gic_ops;