Hi Andre,
On 04/03/2016 12:08 PM, Christoffer Dall wrote:
> On Sat, Mar 26, 2016 at 02:14:01AM +0000, 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 <[email protected]>
>> ---
>> Documentation/virtual/kvm/devices/arm-vgic.txt | 9 +++++++++
>> arch/arm64/include/uapi/asm/kvm.h | 2 ++
>> include/kvm/vgic/vgic.h | 5 +++++
>> virt/kvm/arm/vgic/vgic.c | 10 ++++++++++
>> virt/kvm/arm/vgic/vgic_init.c | 1 +
>> virt/kvm/arm/vgic/vgic_kvm_device.c | 7 +++++++
>> 6 files changed, 34 insertions(+)
>>
>> diff --git a/Documentation/virtual/kvm/devices/arm-vgic.txt
>> b/Documentation/virtual/kvm/devices/arm-vgic.txt
>> index 59541d4..087e2d9 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
>
> s/optional, if/optional. If/
>
>> + does not support the ITS, the call returns -ENODEV.
>> + This memory is solely for the guest to access the ITS control
>
> s/memory/address region/ ?
>
>> + 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.
>
> s/KByte/KBytes/
> ...or you could you 64K both places in this line.
>
>>
>> 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 f209ea1..c2b257d 100644
>> --- a/arch/arm64/include/uapi/asm/kvm.h
>> +++ b/arch/arm64/include/uapi/asm/kvm.h
>> @@ -87,9 +87,11 @@ 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/vgic/vgic.h b/include/kvm/vgic/vgic.h
>> index 7c1d145..11344e6 100644
>> --- a/include/kvm/vgic/vgic.h
>> +++ b/include/kvm/vgic/vgic.h
>> @@ -135,6 +135,9 @@ struct vgic_dist {
>> gpa_t vgic_redist_base;
>> };
>>
>> + /* The base address of the ITS control register frame */
>> + gpa_t vgic_its_base;
>> +
>> /* distributor enabled */
>> u32 enabled;
>>
>> @@ -253,4 +256,6 @@ static inline int kvm_vgic_get_max_vcpus(void)
>> return kvm_vgic_global_state.max_gic_vcpus;
>> }
>>
>> +bool vgic_has_its(struct kvm *kvm);
is it mandated to expose this function outside of the vgic subsystem?
why not declaring it in /virt/kvm/arm/vgic/vgic.h?
>> +
>> #endif /* __ASM_ARM_KVM_VGIC_VGIC_H */
>> diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c
>> index 65395af..1de2478 100644
>> --- a/virt/kvm/arm/vgic/vgic.c
>> +++ b/virt/kvm/arm/vgic/vgic.c
>> @@ -612,3 +612,13 @@ bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, u32
>> intid)
>>
>> return map_is_active;
>> }
>> +
>> +bool vgic_has_its(struct kvm *kvm)
I would implement this function vgic_init.c or vgic_kvm_device.c leaving
vgic.c for pure vgic state mgt.
Eric
>> +{
>> + 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);
>> +}
>> diff --git a/virt/kvm/arm/vgic/vgic_init.c b/virt/kvm/arm/vgic/vgic_init.c
>> index ac655b5..2301e03 100644
>> --- a/virt/kvm/arm/vgic/vgic_init.c
>> +++ b/virt/kvm/arm/vgic/vgic_init.c
>> @@ -132,6 +132,7 @@ int kvm_vgic_create(struct kvm *kvm, u32 type)
>> kvm->arch.vgic.vgic_dist_base = VGIC_ADDR_UNDEF;
>> kvm->arch.vgic.vgic_cpu_base = VGIC_ADDR_UNDEF;
>> kvm->arch.vgic.vgic_redist_base = VGIC_ADDR_UNDEF;
>> + kvm->arch.vgic.vgic_its_base = VGIC_ADDR_UNDEF;
>>
>> out_unlock:
>> for (; vcpu_lock_idx >= 0; vcpu_lock_idx--) {
>> diff --git a/virt/kvm/arm/vgic/vgic_kvm_device.c
>> b/virt/kvm/arm/vgic/vgic_kvm_device.c
>> index 7f78a16..3ec2ac3 100644
>> --- a/virt/kvm/arm/vgic/vgic_kvm_device.c
>> +++ b/virt/kvm/arm/vgic/vgic_kvm_device.c
>> @@ -109,6 +109,12 @@ 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;
>> @@ -495,6 +501,7 @@ static int vgic_v3_has_attr(struct kvm_device *dev,
>> switch (attr->attr) {
>> case KVM_VGIC_V3_ADDR_TYPE_DIST:
>> case KVM_VGIC_V3_ADDR_TYPE_REDIST:
>> + case KVM_VGIC_V3_ADDR_TYPE_ITS:
>> return 0;
>> }
>> break;
>> --
>> 2.7.3
>>
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