[PATCH 03/10] KVM: arm-vgic: Set base addr through device API
Marc Zyngier
marc.zyngier at arm.com
Mon Dec 16 06:46:46 EST 2013
On 12/12/13 19:55, Christoffer Dall wrote:
> 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.
>
> Signed-off-by: Christoffer Dall <christoffer.dall at linaro.org>
Acked-by: Marc Zyngier <marc.zyngier at arm.com>
M.
> ---
> Changelog[v4]:
> - Move VGIC device control API defines to later patch where they are
> used
> - Remove unused variable declaration
>
> Changelog[v3]:
> - Spelling nits
> - Fix error codes from vgic_get_attr
>
> Changelog[v2]:
> - None
>
> Documentation/virtual/kvm/api.txt | 7 ++-
> Documentation/virtual/kvm/devices/arm-vgic.txt | 11 ++++
> arch/arm/include/uapi/asm/kvm.h | 2 +
> arch/arm/kvm/arm.c | 2 +-
> include/kvm/arm_vgic.h | 2 +-
> virt/kvm/arm/vgic.c | 87 ++++++++++++++++++++++----
> 6 files changed, 96 insertions(+), 15 deletions(-)
>
> diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
> index a30035d..867112f 100644
> --- a/Documentation/virtual/kvm/api.txt
> +++ b/Documentation/virtual/kvm/api.txt
> @@ -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
> diff --git a/Documentation/virtual/kvm/devices/arm-vgic.txt b/Documentation/virtual/kvm/devices/arm-vgic.txt
> index 38f27f7..c9febb2 100644
> --- a/Documentation/virtual/kvm/devices/arm-vgic.txt
> +++ b/Documentation/virtual/kvm/devices/arm-vgic.txt
> @@ -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.
> diff --git a/arch/arm/include/uapi/asm/kvm.h b/arch/arm/include/uapi/asm/kvm.h
> index 835b867..76a7427 100644
> --- a/arch/arm/include/uapi/asm/kvm.h
> +++ b/arch/arm/include/uapi/asm/kvm.h
> @@ -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
> diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
> index cc7c41a..f290b22 100644
> --- a/arch/arm/kvm/arm.c
> +++ b/arch/arm/kvm/arm.c
> @@ -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;
> }
> diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
> index 7e2d158..be85127 100644
> --- a/include/kvm/arm_vgic.h
> +++ b/include/kvm/arm_vgic.h
> @@ -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);
> diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
> index b15d6c1..45db48d 100644
> --- a/virt/kvm/arm/vgic.c
> +++ b/virt/kvm/arm/vgic.c
> @@ -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;
> }
>
>
--
Jazz is not dead. It just smells funny...
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