[RFC PATCH 8/8] ARM: KVM: Support vGICv3 ITS
Vladimir Murzin
vladimir.murzin at arm.com
Fri Oct 21 04:20:43 PDT 2016
On 21/10/16 12:02, Andre Przywara wrote:
> Hi,
>
> On 21/10/16 10:36, Vladimir Murzin wrote:
>> This patch allows to build and use vGICv3 ITS in 32-bit mode.
>
> Ah, what a relief to see that config option go. Thanks for that!
>
> I quickly booted an ITS guest on a (64-bit) model and couldn't spot any
> regressions.
Awesome!
>
>> Signed-off-by: Vladimir Murzin <vladimir.murzin at arm.com>
>
> Reviewed-by: Andre Przywara <andre.przywara at arm.com>
Thanks for your time!
Cheers
Vladimir
>
> Cheers,
> Andre.
>
>> ---
>> Documentation/virtual/kvm/api.txt | 2 +-
>> arch/arm/include/uapi/asm/kvm.h | 2 ++
>> arch/arm/kvm/Kconfig | 1 +
>> arch/arm/kvm/Makefile | 1 +
>> arch/arm/kvm/arm.c | 6 ++++++
>> arch/arm64/kvm/Kconfig | 4 ----
>> arch/arm64/kvm/reset.c | 6 ------
>> virt/kvm/arm/vgic/vgic-kvm-device.c | 2 --
>> virt/kvm/arm/vgic/vgic-mmio-v3.c | 2 --
>> virt/kvm/arm/vgic/vgic.h | 26 --------------------------
>> 10 files changed, 11 insertions(+), 41 deletions(-)
>>
>> diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
>> index 739db9a..2feeae6 100644
>> --- a/Documentation/virtual/kvm/api.txt
>> +++ b/Documentation/virtual/kvm/api.txt
>> @@ -2198,7 +2198,7 @@ after pausing the vcpu, but before it is resumed.
>> 4.71 KVM_SIGNAL_MSI
>>
>> Capability: KVM_CAP_SIGNAL_MSI
>> -Architectures: x86 arm64
>> +Architectures: x86 arm arm64
>> Type: vm ioctl
>> Parameters: struct kvm_msi (in)
>> Returns: >0 on delivery, 0 if guest blocked the MSI, and -1 on error
>> diff --git a/arch/arm/include/uapi/asm/kvm.h b/arch/arm/include/uapi/asm/kvm.h
>> index b38c10c..af05f8e 100644
>> --- a/arch/arm/include/uapi/asm/kvm.h
>> +++ b/arch/arm/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_ITS_ADDR_TYPE 4
>>
>> #define KVM_VGIC_V3_DIST_SIZE SZ_64K
>> #define KVM_VGIC_V3_REDIST_SIZE (2 * SZ_64K)
>> +#define KVM_VGIC_V3_ITS_SIZE (2 * SZ_64K)
>>
>> #define KVM_ARM_VCPU_POWER_OFF 0 /* CPU is started in OFF state */
>> #define KVM_ARM_VCPU_PSCI_0_2 1 /* CPU uses PSCI v0.2 */
>> diff --git a/arch/arm/kvm/Kconfig b/arch/arm/kvm/Kconfig
>> index 3e1cd04..90d0176 100644
>> --- a/arch/arm/kvm/Kconfig
>> +++ b/arch/arm/kvm/Kconfig
>> @@ -34,6 +34,7 @@ config KVM
>> select HAVE_KVM_IRQFD
>> select HAVE_KVM_IRQCHIP
>> select HAVE_KVM_IRQ_ROUTING
>> + select HAVE_KVM_MSI
>> depends on ARM_VIRT_EXT && ARM_LPAE && ARM_ARCH_TIMER
>> ---help---
>> Support hosting virtualized guest machines.
>> diff --git a/arch/arm/kvm/Makefile b/arch/arm/kvm/Makefile
>> index f19842e..d571243 100644
>> --- a/arch/arm/kvm/Makefile
>> +++ b/arch/arm/kvm/Makefile
>> @@ -32,5 +32,6 @@ obj-y += $(KVM)/arm/vgic/vgic-mmio.o
>> obj-y += $(KVM)/arm/vgic/vgic-mmio-v2.o
>> obj-y += $(KVM)/arm/vgic/vgic-mmio-v3.o
>> obj-y += $(KVM)/arm/vgic/vgic-kvm-device.o
>> +obj-y += $(KVM)/arm/vgic/vgic-its.o
>> obj-y += $(KVM)/irqchip.o
>> obj-y += $(KVM)/arm/arch_timer.o
>> diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
>> index 03e9273..8b13448 100644
>> --- a/arch/arm/kvm/arm.c
>> +++ b/arch/arm/kvm/arm.c
>> @@ -209,6 +209,12 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
>> case KVM_CAP_MAX_VCPUS:
>> r = KVM_MAX_VCPUS;
>> break;
>> + case KVM_CAP_MSI_DEVID:
>> + if (!kvm)
>> + r = -EINVAL;
>> + else
>> + r = kvm->arch.vgic.msis_require_devid;
>> + break;
>> default:
>> r = kvm_arch_dev_ioctl_check_extension(kvm, ext);
>> break;
>> diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig
>> index 6eaf12c..52cb7ad 100644
>> --- a/arch/arm64/kvm/Kconfig
>> +++ b/arch/arm64/kvm/Kconfig
>> @@ -16,9 +16,6 @@ menuconfig VIRTUALIZATION
>>
>> if VIRTUALIZATION
>>
>> -config KVM_ARM_VGIC_V3_ITS
>> - bool
>> -
>> config KVM
>> bool "Kernel-based Virtual Machine (KVM) support"
>> depends on OF
>> @@ -34,7 +31,6 @@ config KVM
>> select KVM_VFIO
>> select HAVE_KVM_EVENTFD
>> select HAVE_KVM_IRQFD
>> - select KVM_ARM_VGIC_V3_ITS
>> select KVM_ARM_PMU if HW_PERF_EVENTS
>> select HAVE_KVM_MSI
>> select HAVE_KVM_IRQCHIP
>> diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c
>> index 5bc4608..e95d4f6 100644
>> --- a/arch/arm64/kvm/reset.c
>> +++ b/arch/arm64/kvm/reset.c
>> @@ -86,12 +86,6 @@ int kvm_arch_dev_ioctl_check_extension(struct kvm *kvm, long ext)
>> case KVM_CAP_VCPU_ATTRIBUTES:
>> r = 1;
>> break;
>> - case KVM_CAP_MSI_DEVID:
>> - if (!kvm)
>> - r = -EINVAL;
>> - else
>> - r = kvm->arch.vgic.msis_require_devid;
>> - break;
>> default:
>> r = 0;
>> }
>> diff --git a/virt/kvm/arm/vgic/vgic-kvm-device.c b/virt/kvm/arm/vgic/vgic-kvm-device.c
>> index ce1f4ed..fbe87a6 100644
>> --- a/virt/kvm/arm/vgic/vgic-kvm-device.c
>> +++ b/virt/kvm/arm/vgic/vgic-kvm-device.c
>> @@ -221,11 +221,9 @@ int kvm_register_vgic_device(unsigned long type)
>> ret = kvm_register_device_ops(&kvm_arm_vgic_v3_ops,
>> KVM_DEV_TYPE_ARM_VGIC_V3);
>>
>> -#ifdef CONFIG_KVM_ARM_VGIC_V3_ITS
>> if (ret)
>> break;
>> ret = kvm_vgic_register_its_device();
>> -#endif
>> break;
>> }
>>
>> diff --git a/virt/kvm/arm/vgic/vgic-mmio-v3.c b/virt/kvm/arm/vgic/vgic-mmio-v3.c
>> index 0d3c76a..50f42f0 100644
>> --- a/virt/kvm/arm/vgic/vgic-mmio-v3.c
>> +++ b/virt/kvm/arm/vgic/vgic-mmio-v3.c
>> @@ -42,7 +42,6 @@ u64 update_64bit_reg(u64 reg, unsigned int offset, unsigned int len,
>> return reg | ((u64)val << lower);
>> }
>>
>> -#ifdef CONFIG_KVM_ARM_VGIC_V3_ITS
>> bool vgic_has_its(struct kvm *kvm)
>> {
>> struct vgic_dist *dist = &kvm->arch.vgic;
>> @@ -52,7 +51,6 @@ bool vgic_has_its(struct kvm *kvm)
>>
>> return dist->has_its;
>> }
>> -#endif
>>
>> static unsigned long vgic_mmio_read_v3_misc(struct kvm_vcpu *vcpu,
>> gpa_t addr, unsigned int len)
>> diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h
>> index 9d9e014..859f65c 100644
>> --- a/virt/kvm/arm/vgic/vgic.h
>> +++ b/virt/kvm/arm/vgic/vgic.h
>> @@ -84,37 +84,11 @@ static inline void vgic_get_irq_kref(struct vgic_irq *irq)
>> int vgic_v3_map_resources(struct kvm *kvm);
>> int vgic_register_redist_iodevs(struct kvm *kvm, gpa_t dist_base_address);
>>
>> -#ifdef CONFIG_KVM_ARM_VGIC_V3_ITS
>> int vgic_register_its_iodevs(struct kvm *kvm);
>> bool vgic_has_its(struct kvm *kvm);
>> int kvm_vgic_register_its_device(void);
>> void vgic_enable_lpis(struct kvm_vcpu *vcpu);
>> int vgic_its_inject_msi(struct kvm *kvm, struct kvm_msi *msi);
>> -#else
>> -static inline int vgic_register_its_iodevs(struct kvm *kvm)
>> -{
>> - return -ENODEV;
>> -}
>> -
>> -static inline bool vgic_has_its(struct kvm *kvm)
>> -{
>> - return false;
>> -}
>> -
>> -static inline int kvm_vgic_register_its_device(void)
>> -{
>> - return -ENODEV;
>> -}
>> -
>> -static inline void vgic_enable_lpis(struct kvm_vcpu *vcpu)
>> -{
>> -}
>> -
>> -static inline int vgic_its_inject_msi(struct kvm *kvm, struct kvm_msi *msi)
>> -{
>> - return -ENODEV;
>> -}
>> -#endif
>>
>> int kvm_register_vgic_device(unsigned long type);
>> int vgic_lazy_init(struct kvm *kvm);
>>
>
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