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KVM: arm64: vgic-v2: Consolidate userspace access for MMIO registers 

Align the GICv2 MMIO accesses from userspace with the way the GICv3
code is now structured.

Reviewed-by: Reiji Watanabe <reijiw@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2022-07-05 10:26:07 +01:00
parent e1246f3f2d
commit 7e9f723c2a
1 changed files with 17 additions and 22 deletions
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39
arch/arm64/kvm/vgic/vgic-kvm-device.c
View File

@ -348,17 +348,18 @@ bool lock_all_vcpus(struct kvm *kvm)
*
* @dev: kvm device handle
* @attr: kvm device attribute
* @reg: address the value is read or written
* @is_write: true if userspace is writing a register
*/
static int vgic_v2_attr_regs_access(struct kvm_device *dev,
struct kvm_device_attr *attr,
u32 *reg, bool is_write)
bool is_write)
{
u32 __user *uaddr = (u32 __user *)(unsigned long)attr->addr;
struct vgic_reg_attr reg_attr;
gpa_t addr;
struct kvm_vcpu *vcpu;
int ret;
u32 val;
ret = vgic_v2_parse_attr(dev, attr, &reg_attr);
if (ret)
@ -367,6 +368,10 @@ static int vgic_v2_attr_regs_access(struct kvm_device *dev,
vcpu = reg_attr.vcpu;
addr = reg_attr.addr;
if (is_write)
if (get_user(val, uaddr))
return -EFAULT;
mutex_lock(&dev->kvm->lock);
ret = vgic_init(dev->kvm);
@ -380,10 +385,10 @@ static int vgic_v2_attr_regs_access(struct kvm_device *dev,
switch (attr->group) {
case KVM_DEV_ARM_VGIC_GRP_CPU_REGS:
ret = vgic_v2_cpuif_uaccess(vcpu, is_write, addr, reg);
ret = vgic_v2_cpuif_uaccess(vcpu, is_write, addr, &val);
break;
case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
ret = vgic_v2_dist_uaccess(vcpu, is_write, addr, reg);
ret = vgic_v2_dist_uaccess(vcpu, is_write, addr, &val);
break;
default:
ret = -EINVAL;
@ -393,6 +398,10 @@ static int vgic_v2_attr_regs_access(struct kvm_device *dev,
unlock_all_vcpus(dev->kvm);
out:
mutex_unlock(&dev->kvm->lock);
if (!ret && !is_write)
ret = put_user(val, uaddr);
return ret;
}
@ -407,15 +416,8 @@ static int vgic_v2_set_attr(struct kvm_device *dev,
switch (attr->group) {
case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
case KVM_DEV_ARM_VGIC_GRP_CPU_REGS: {
u32 __user *uaddr = (u32 __user *)(long)attr->addr;
u32 reg;
if (get_user(reg, uaddr))
return -EFAULT;
return vgic_v2_attr_regs_access(dev, attr, &reg, true);
}
case KVM_DEV_ARM_VGIC_GRP_CPU_REGS:
return vgic_v2_attr_regs_access(dev, attr, true);
}
return -ENXIO;
@ -432,15 +434,8 @@ static int vgic_v2_get_attr(struct kvm_device *dev,
switch (attr->group) {
case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
case KVM_DEV_ARM_VGIC_GRP_CPU_REGS: {
u32 __user *uaddr = (u32 __user *)(long)attr->addr;
u32 reg = 0;
ret = vgic_v2_attr_regs_access(dev, attr, &reg, false);
if (ret)
return ret;
return put_user(reg, uaddr);
}
case KVM_DEV_ARM_VGIC_GRP_CPU_REGS:
return vgic_v2_attr_regs_access(dev, attr, false);
}
return -ENXIO;