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KVM: arm64: vgic: Consolidate userspace access for base address setting

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Align kvm_vgic_addr() with the rest of the code by moving the
userspace accesses into it. kvm_vgic_addr() is also made static.

Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2022-07-05 14:39:24 +01:00
parent 9f968c9266
commit 4b85080f4e
2 changed files with 31 additions and 45 deletions
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73
arch/arm64/kvm/vgic/vgic-kvm-device.c
View file

@ -76,8 +76,7 @@ int kvm_set_legacy_vgic_v2_addr(struct kvm *kvm, struct kvm_arm_device_addr *dev
/**
* kvm_vgic_addr - set or get vgic VM base addresses
* @kvm: pointer to the vm struct
* @type: the VGIC addr type, one of KVM_VGIC_V[23]_ADDR_TYPE_XXX
* @addr: pointer to address value
* @attr: pointer to the attribute being retrieved/updated
* @write: if true set the address in the VM address space, if false read the
* address
*
@ -89,15 +88,22 @@ int kvm_set_legacy_vgic_v2_addr(struct kvm *kvm, struct kvm_arm_device_addr *dev
* overlapping regions in case of a virtual GICv3 here, since we don't know
* the number of VCPUs yet, so we defer this check to map_resources().
*/
int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write)
static int kvm_vgic_addr(struct kvm *kvm, struct kvm_device_attr *attr, bool write)
{
int r = 0;
u64 __user *uaddr = (u64 __user *)attr->addr;
struct vgic_dist *vgic = &kvm->arch.vgic;
phys_addr_t *addr_ptr, alignment, size;
u64 undef_value = VGIC_ADDR_UNDEF;
u64 addr;
int r;
/* Reading a redistributor region addr implies getting the index */
if (write || attr->attr == KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION)
if (get_user(addr, uaddr))
return -EFAULT;
mutex_lock(&kvm->lock);
switch (type) {
switch (attr->attr) {
case KVM_VGIC_V2_ADDR_TYPE_DIST:
r = vgic_check_type(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
addr_ptr = &vgic->vgic_dist_base;
@ -123,7 +129,7 @@ int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write)
if (r)
break;
if (write) {
r = vgic_v3_set_redist_base(kvm, 0, *addr, 0);
r = vgic_v3_set_redist_base(kvm, 0, addr, 0);
goto out;
}
rdreg = list_first_entry_or_null(&vgic->rd_regions,
@ -143,14 +149,12 @@ int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write)
if (r)
break;
index = *addr & KVM_VGIC_V3_RDIST_INDEX_MASK;
index = addr & KVM_VGIC_V3_RDIST_INDEX_MASK;
if (write) {
gpa_t base = *addr & KVM_VGIC_V3_RDIST_BASE_MASK;
u32 count = (*addr & KVM_VGIC_V3_RDIST_COUNT_MASK)
>> KVM_VGIC_V3_RDIST_COUNT_SHIFT;
u8 flags = (*addr & KVM_VGIC_V3_RDIST_FLAGS_MASK)
>> KVM_VGIC_V3_RDIST_FLAGS_SHIFT;
gpa_t base = addr & KVM_VGIC_V3_RDIST_BASE_MASK;
u32 count = FIELD_GET(KVM_VGIC_V3_RDIST_COUNT_MASK, addr);
u8 flags = FIELD_GET(KVM_VGIC_V3_RDIST_FLAGS_MASK, addr);
if (!count || flags)
r = -EINVAL;
@ -166,9 +170,9 @@ int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write)
goto out;
}
*addr = index;
*addr |= rdreg->base;
*addr |= (u64)rdreg->count << KVM_VGIC_V3_RDIST_COUNT_SHIFT;
addr = index;
addr |= rdreg->base;
addr |= (u64)rdreg->count << KVM_VGIC_V3_RDIST_COUNT_SHIFT;
goto out;
}
default:
@ -179,15 +183,19 @@ int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write)
goto out;
if (write) {
r = vgic_check_iorange(kvm, *addr_ptr, *addr, alignment, size);
r = vgic_check_iorange(kvm, *addr_ptr, addr, alignment, size);
if (!r)
*addr_ptr = *addr;
*addr_ptr = addr;
} else {
*addr = *addr_ptr;
addr = *addr_ptr;
}
out:
mutex_unlock(&kvm->lock);
if (!r && !write)
r = put_user(addr, uaddr);
return r;
}
@ -197,17 +205,9 @@ static int vgic_set_common_attr(struct kvm_device *dev,
int r;
switch (attr->group) {
case KVM_DEV_ARM_VGIC_GRP_ADDR: {
u64 __user *uaddr = (u64 __user *)(long)attr->addr;
u64 addr;
unsigned long type = (unsigned long)attr->attr;
if (get_user(addr, uaddr))
return -EFAULT;
r = kvm_vgic_addr(dev->kvm, type, &addr, true);
case KVM_DEV_ARM_VGIC_GRP_ADDR:
r = kvm_vgic_addr(dev->kvm, attr, true);
return (r == -ENODEV) ? -ENXIO : r;
}
case KVM_DEV_ARM_VGIC_GRP_NR_IRQS: {
u32 __user *uaddr = (u32 __user *)(long)attr->addr;
u32 val;
@ -260,22 +260,9 @@ static int vgic_get_common_attr(struct kvm_device *dev,
int r = -ENXIO;
switch (attr->group) {
case KVM_DEV_ARM_VGIC_GRP_ADDR: {
u64 __user *uaddr = (u64 __user *)(long)attr->addr;
u64 addr;
unsigned long type = (unsigned long)attr->attr;
if (get_user(addr, uaddr))
return -EFAULT;
r = kvm_vgic_addr(dev->kvm, type, &addr, false);
if (r)
case KVM_DEV_ARM_VGIC_GRP_ADDR:
r = kvm_vgic_addr(dev->kvm, attr, false);
return (r == -ENODEV) ? -ENXIO : r;
if (put_user(addr, uaddr))
return -EFAULT;
break;
}
case KVM_DEV_ARM_VGIC_GRP_NR_IRQS: {
u32 __user *uaddr = (u32 __user *)(long)attr->addr;

1
include/kvm/arm_vgic.h
View file

@ -364,7 +364,6 @@ struct vgic_cpu {
extern struct static_key_false vgic_v2_cpuif_trap;
extern struct static_key_false vgic_v3_cpuif_trap;
int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write);
int kvm_set_legacy_vgic_v2_addr(struct kvm *kvm, struct kvm_arm_device_addr *dev_addr);
void kvm_vgic_early_init(struct kvm *kvm);
int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu);