Reviewed-by: Eric Auger <eric.au...@linaro.org>
On 07/10/2015 04:21 PM, Andre Przywara wrote:
> The ARM GICv3 ITS controller requires a separate register frame to
> cover ITS specific registers. Add a new VGIC address type and store
> the address in a field in the vgic_dist structure.
> Provide a function to check whether userland has provided the address,
> so ITS functionality can be guarded by that check.
>
> Signed-off-by: Andre Przywara <andre.przyw...@arm.com>
> ---
> Documentation/virtual/kvm/devices/arm-vgic.txt | 9 +++++++++
> arch/arm64/include/uapi/asm/kvm.h | 2 ++
> include/kvm/arm_vgic.h | 3 +++
> virt/kvm/arm/vgic-v3-emul.c | 2 ++
> virt/kvm/arm/vgic.c | 16 ++++++++++++++++
> virt/kvm/arm/vgic.h | 1 +
> 6 files changed, 33 insertions(+)
>
> diff --git a/Documentation/virtual/kvm/devices/arm-vgic.txt
> b/Documentation/virtual/kvm/devices/arm-vgic.txt
> index 3fb9054..ec715f9e 100644
> --- a/Documentation/virtual/kvm/devices/arm-vgic.txt
> +++ b/Documentation/virtual/kvm/devices/arm-vgic.txt
> @@ -39,6 +39,15 @@ Groups:
> Only valid for KVM_DEV_TYPE_ARM_VGIC_V3.
> This address needs to be 64K aligned.
>
> + KVM_VGIC_V3_ADDR_TYPE_ITS (rw, 64-bit)
> + Base address in the guest physical address space of the GICv3 ITS
> + control register frame. The ITS allows MSI(-X) interrupts to be
> + injected into guests. This extension is optional, if the kernel
> + does not support the ITS, the call returns -ENODEV.
> + This memory is solely for the guest to access the ITS control
> + registers and does not cover the ITS translation register.
> + Only valid for KVM_DEV_TYPE_ARM_VGIC_V3.
> + This address needs to be 64K aligned and the region covers 64 KByte.
>
> KVM_DEV_ARM_VGIC_GRP_DIST_REGS
> Attributes:
> diff --git a/arch/arm64/include/uapi/asm/kvm.h
> b/arch/arm64/include/uapi/asm/kvm.h
> index d268320..a89b407c 100644
> --- a/arch/arm64/include/uapi/asm/kvm.h
> +++ b/arch/arm64/include/uapi/asm/kvm.h
> @@ -81,9 +81,11 @@ struct kvm_regs {
> /* Supported VGICv3 address types */
> #define KVM_VGIC_V3_ADDR_TYPE_DIST 2
> #define KVM_VGIC_V3_ADDR_TYPE_REDIST 3
> +#define KVM_VGIC_V3_ADDR_TYPE_ITS 4
>
> #define KVM_VGIC_V3_DIST_SIZE SZ_64K
> #define KVM_VGIC_V3_REDIST_SIZE (2 * SZ_64K)
> +#define KVM_VGIC_V3_ITS_SIZE SZ_64K
>
> #define KVM_ARM_VCPU_POWER_OFF 0 /* CPU is started in OFF
> state */
> #define KVM_ARM_VCPU_EL1_32BIT 1 /* CPU running a 32bit VM */
> diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
> index b18e2c5..3ee063b 100644
> --- a/include/kvm/arm_vgic.h
> +++ b/include/kvm/arm_vgic.h
> @@ -178,6 +178,9 @@ struct vgic_dist {
> phys_addr_t vgic_redist_base;
> };
>
> + /* The base address of the ITS control register frame */
> + phys_addr_t vgic_its_base;
> +
> /* Distributor enabled */
> u32 enabled;
>
> diff --git a/virt/kvm/arm/vgic-v3-emul.c b/virt/kvm/arm/vgic-v3-emul.c
> index 1f42348..a8cf669 100644
> --- a/virt/kvm/arm/vgic-v3-emul.c
> +++ b/virt/kvm/arm/vgic-v3-emul.c
> @@ -887,6 +887,7 @@ void vgic_v3_init_emulation(struct kvm *kvm)
>
> dist->vgic_dist_base = VGIC_ADDR_UNDEF;
> dist->vgic_redist_base = VGIC_ADDR_UNDEF;
> + dist->vgic_its_base = VGIC_ADDR_UNDEF;
>
> kvm->arch.max_vcpus = KVM_MAX_VCPUS;
> }
> @@ -1059,6 +1060,7 @@ static int vgic_v3_has_attr(struct kvm_device *dev,
> return -ENXIO;
> case KVM_VGIC_V3_ADDR_TYPE_DIST:
> case KVM_VGIC_V3_ADDR_TYPE_REDIST:
> + case KVM_VGIC_V3_ADDR_TYPE_ITS:
> return 0;
> }
> break;
> diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
> index 59f1801..15e447f 100644
> --- a/virt/kvm/arm/vgic.c
> +++ b/virt/kvm/arm/vgic.c
> @@ -930,6 +930,16 @@ int vgic_register_kvm_io_dev(struct kvm *kvm, gpa_t
> base, int len,
> return ret;
> }
>
> +bool vgic_has_its(struct kvm *kvm)
> +{
> + struct vgic_dist *dist = &kvm->arch.vgic;
> +
> + if (dist->vgic_model != KVM_DEV_TYPE_ARM_VGIC_V3)
> + return false;
> +
> + return !IS_VGIC_ADDR_UNDEF(dist->vgic_its_base);
> +}
> +
> static int vgic_nr_shared_irqs(struct vgic_dist *dist)
> {
> return dist->nr_irqs - VGIC_NR_PRIVATE_IRQS;
> @@ -1927,6 +1937,12 @@ int kvm_vgic_addr(struct kvm *kvm, unsigned long type,
> u64 *addr, bool write)
> block_size = KVM_VGIC_V3_REDIST_SIZE;
> alignment = SZ_64K;
> break;
> + case KVM_VGIC_V3_ADDR_TYPE_ITS:
> + type_needed = KVM_DEV_TYPE_ARM_VGIC_V3;
> + addr_ptr = &vgic->vgic_its_base;
> + block_size = KVM_VGIC_V3_ITS_SIZE;
> + alignment = SZ_64K;
> + break;
> #endif
> default:
> r = -ENODEV;
> diff --git a/virt/kvm/arm/vgic.h b/virt/kvm/arm/vgic.h
> index 0df74cb..a093f5c 100644
> --- a/virt/kvm/arm/vgic.h
> +++ b/virt/kvm/arm/vgic.h
> @@ -136,5 +136,6 @@ int vgic_get_common_attr(struct kvm_device *dev, struct
> kvm_device_attr *attr);
> int vgic_init(struct kvm *kvm);
> void vgic_v2_init_emulation(struct kvm *kvm);
> void vgic_v3_init_emulation(struct kvm *kvm);
> +bool vgic_has_its(struct kvm *kvm);
>
> #endif
>
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