Commit ce01e4e8 authored by Christoffer Dall's avatar Christoffer Dall

KVM: arm-vgic: Set base addr through device API

Support setting the distributor and cpu interface base addresses in the
VM physical address space through the KVM_{SET,GET}_DEVICE_ATTR API
in addition to the ARM specific API.

This has the added benefit of being able to share more code in user
space and do things in a uniform manner.

Also deprecate the older API at the same time, but backwards
compatibility will be maintained.
Acked-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: default avatarChristoffer Dall <christoffer.dall@linaro.org>
parent 7330672b
......@@ -2391,7 +2391,8 @@ struct kvm_reg_list {
This ioctl returns the guest registers that are supported for the
KVM_GET_ONE_REG/KVM_SET_ONE_REG calls.
4.85 KVM_ARM_SET_DEVICE_ADDR
4.85 KVM_ARM_SET_DEVICE_ADDR (deprecated)
Capability: KVM_CAP_ARM_SET_DEVICE_ADDR
Architectures: arm, arm64
......@@ -2429,6 +2430,10 @@ must be called after calling KVM_CREATE_IRQCHIP, but before calling
KVM_RUN on any of the VCPUs. Calling this ioctl twice for any of the
base addresses will return -EEXIST.
Note, this IOCTL is deprecated and the more flexible SET/GET_DEVICE_ATTR API
should be used instead.
4.86 KVM_PPC_RTAS_DEFINE_TOKEN
Capability: KVM_CAP_PPC_RTAS
......
......@@ -8,3 +8,14 @@ Only one VGIC instance may be instantiated through either this API or the
legacy KVM_CREATE_IRQCHIP api. The created VGIC will act as the VM interrupt
controller, requiring emulated user-space devices to inject interrupts to the
VGIC instead of directly to CPUs.
Groups:
KVM_DEV_ARM_VGIC_GRP_ADDR
Attributes:
KVM_VGIC_V2_ADDR_TYPE_DIST (rw, 64-bit)
Base address in the guest physical address space of the GIC distributor
register mappings.
KVM_VGIC_V2_ADDR_TYPE_CPU (rw, 64-bit)
Base address in the guest physical address space of the GIC virtual cpu
interface register mappings.
......@@ -163,6 +163,8 @@ struct kvm_arch_memory_slot {
#define KVM_REG_ARM_VFP_FPINST 0x1009
#define KVM_REG_ARM_VFP_FPINST2 0x100A
/* Device Control API: ARM VGIC */
#define KVM_DEV_ARM_VGIC_GRP_ADDR 0
/* KVM_IRQ_LINE irq field index values */
#define KVM_ARM_IRQ_TYPE_SHIFT 24
......
......@@ -776,7 +776,7 @@ static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
case KVM_ARM_DEVICE_VGIC_V2:
if (!vgic_present)
return -ENXIO;
return kvm_vgic_set_addr(kvm, type, dev_addr->addr);
return kvm_vgic_addr(kvm, type, &dev_addr->addr, true);
default:
return -ENODEV;
}
......
......@@ -144,7 +144,7 @@ struct kvm_run;
struct kvm_exit_mmio;
#ifdef CONFIG_KVM_ARM_VGIC
int kvm_vgic_set_addr(struct kvm *kvm, unsigned long type, u64 addr);
int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write);
int kvm_vgic_hyp_init(void);
int kvm_vgic_init(struct kvm *kvm);
int kvm_vgic_create(struct kvm *kvm);
......
......@@ -1495,6 +1495,12 @@ static int vgic_ioaddr_assign(struct kvm *kvm, phys_addr_t *ioaddr,
{
int ret;
if (addr & ~KVM_PHYS_MASK)
return -E2BIG;
if (addr & (SZ_4K - 1))
return -EINVAL;
if (!IS_VGIC_ADDR_UNDEF(*ioaddr))
return -EEXIST;
if (addr + size < addr)
......@@ -1507,26 +1513,41 @@ static int vgic_ioaddr_assign(struct kvm *kvm, phys_addr_t *ioaddr,
return ret;
}
int kvm_vgic_set_addr(struct kvm *kvm, unsigned long type, u64 addr)
/**
* 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_V2_ADDR_TYPE_XXX
* @addr: pointer to address value
* @write: if true set the address in the VM address space, if false read the
* address
*
* Set or get the vgic base addresses for the distributor and the virtual CPU
* interface in the VM physical address space. These addresses are properties
* of the emulated core/SoC and therefore user space initially knows this
* information.
*/
int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write)
{
int r = 0;
struct vgic_dist *vgic = &kvm->arch.vgic;
if (addr & ~KVM_PHYS_MASK)
return -E2BIG;
if (addr & (SZ_4K - 1))
return -EINVAL;
mutex_lock(&kvm->lock);
switch (type) {
case KVM_VGIC_V2_ADDR_TYPE_DIST:
r = vgic_ioaddr_assign(kvm, &vgic->vgic_dist_base,
addr, KVM_VGIC_V2_DIST_SIZE);
if (write) {
r = vgic_ioaddr_assign(kvm, &vgic->vgic_dist_base,
*addr, KVM_VGIC_V2_DIST_SIZE);
} else {
*addr = vgic->vgic_dist_base;
}
break;
case KVM_VGIC_V2_ADDR_TYPE_CPU:
r = vgic_ioaddr_assign(kvm, &vgic->vgic_cpu_base,
addr, KVM_VGIC_V2_CPU_SIZE);
if (write) {
r = vgic_ioaddr_assign(kvm, &vgic->vgic_cpu_base,
*addr, KVM_VGIC_V2_CPU_SIZE);
} else {
*addr = vgic->vgic_cpu_base;
}
break;
default:
r = -ENODEV;
......@@ -1538,16 +1559,58 @@ int kvm_vgic_set_addr(struct kvm *kvm, unsigned long type, u64 addr)
static int vgic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
{
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 (copy_from_user(&addr, uaddr, sizeof(addr)))
return -EFAULT;
r = kvm_vgic_addr(dev->kvm, type, &addr, true);
return (r == -ENODEV) ? -ENXIO : r;
}
}
return -ENXIO;
}
static int vgic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
{
return -ENXIO;
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;
r = kvm_vgic_addr(dev->kvm, type, &addr, false);
if (r)
return (r == -ENODEV) ? -ENXIO : r;
if (copy_to_user(uaddr, &addr, sizeof(addr)))
return -EFAULT;
}
}
return r;
}
static int vgic_has_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
{
switch (attr->group) {
case KVM_DEV_ARM_VGIC_GRP_ADDR:
switch (attr->attr) {
case KVM_VGIC_V2_ADDR_TYPE_DIST:
case KVM_VGIC_V2_ADDR_TYPE_CPU:
return 0;
}
break;
}
return -ENXIO;
}
......
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