[PATCH v3 22/55] KVM: arm/arm64: vgic-new: Add GICv2 MMIO handling framework

[Christoffer Dall]

On Fri, May 06, 2016 at 11:45:35AM +0100, Andre Przywara wrote:
> Create vgic-mmio-v2.c to describe GICv2 emulation specific handlers
> using the initializer macros provided by the VGIC MMIO framework.
> Provide a function to register the GICv2 distributor registers to
> the kvm_io_bus framework.
> The actual handler functions are still stubs in this patch.
> 
> Signed-off-by: Andre Przywara <andre.przywara at arm.com>
> Signed-off-by: Marc Zyngier <marc.zyngier at arm.com>
> ---
> Changelog v1 .. v2:
> - new patch, split out from the generic MMIO framework patch
> - use a separate file to hold GICv2 emulation specific handlers
> - replace _nyi stub functions with raz/wi versions
> 
> Changelog v2 .. v3:
> - replace kvm/vgic/vgic.h with kvm/arm_vgic.h
> - add vgic_register_dist_iodev() prototype
> 
>  virt/kvm/arm/vgic/vgic-mmio-v2.c | 62 ++++++++++++++++++++++++++++++++++++++++
>  virt/kvm/arm/vgic/vgic-mmio.c    | 26 +++++++++++++++++
>  virt/kvm/arm/vgic/vgic-mmio.h    |  2 ++
>  virt/kvm/arm/vgic/vgic.h         |  2 ++
>  4 files changed, 92 insertions(+)
>  create mode 100644 virt/kvm/arm/vgic/vgic-mmio-v2.c
> 
> diff --git a/virt/kvm/arm/vgic/vgic-mmio-v2.c b/virt/kvm/arm/vgic/vgic-mmio-v2.c
> new file mode 100644
> index 0000000..2729a22
> --- /dev/null
> +++ b/virt/kvm/arm/vgic/vgic-mmio-v2.c
> @@ -0,0 +1,62 @@
> +/*
> + * VGICv2 MMIO handling functions
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/irqchip/arm-gic.h>
> +#include <linux/kvm.h>
> +#include <linux/kvm_host.h>
> +#include <kvm/iodev.h>
> +#include <kvm/arm_vgic.h>
> +
> +#include "vgic.h"
> +#include "vgic-mmio.h"
> +
> +static const struct vgic_register_region vgic_v2_dist_registers[] = {
> +	REGISTER_DESC_WITH_LENGTH(GIC_DIST_CTRL,
> +		vgic_mmio_read_raz, vgic_mmio_write_wi, 12),
> +	REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_IGROUP,
> +		vgic_mmio_read_rao, vgic_mmio_write_wi, 1),
> +	REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_ENABLE_SET,
> +		vgic_mmio_read_raz, vgic_mmio_write_wi, 1),
> +	REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_ENABLE_CLEAR,
> +		vgic_mmio_read_raz, vgic_mmio_write_wi, 1),
> +	REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_PENDING_SET,
> +		vgic_mmio_read_raz, vgic_mmio_write_wi, 1),
> +	REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_PENDING_CLEAR,
> +		vgic_mmio_read_raz, vgic_mmio_write_wi, 1),
> +	REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_ACTIVE_SET,
> +		vgic_mmio_read_raz, vgic_mmio_write_wi, 1),
> +	REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_ACTIVE_CLEAR,
> +		vgic_mmio_read_raz, vgic_mmio_write_wi, 1),
> +	REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_PRI,
> +		vgic_mmio_read_raz, vgic_mmio_write_wi, 8),
> +	REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_TARGET,
> +		vgic_mmio_read_raz, vgic_mmio_write_wi, 8),
> +	REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_CONFIG,
> +		vgic_mmio_read_raz, vgic_mmio_write_wi, 2),
> +	REGISTER_DESC_WITH_LENGTH(GIC_DIST_SOFTINT,
> +		vgic_mmio_read_raz, vgic_mmio_write_wi, 4),
> +	REGISTER_DESC_WITH_LENGTH(GIC_DIST_SGI_PENDING_CLEAR,
> +		vgic_mmio_read_raz, vgic_mmio_write_wi, 16),
> +	REGISTER_DESC_WITH_LENGTH(GIC_DIST_SGI_PENDING_SET,
> +		vgic_mmio_read_raz, vgic_mmio_write_wi, 16),
> +};
> +
> +unsigned int vgic_v2_init_dist_iodev(struct vgic_io_device *dev)
> +{
> +	dev->regions = vgic_v2_dist_registers;
> +	dev->nr_regions = ARRAY_SIZE(vgic_v2_dist_registers);
> +
> +	kvm_iodevice_init(&dev->dev, &kvm_io_gic_ops);
> +
> +	return SZ_4K;
> +}
> diff --git a/virt/kvm/arm/vgic/vgic-mmio.c b/virt/kvm/arm/vgic/vgic-mmio.c
> index f5628cb..41cf4f4 100644
> --- a/virt/kvm/arm/vgic/vgic-mmio.c
> +++ b/virt/kvm/arm/vgic/vgic-mmio.c
> @@ -169,3 +169,29 @@ struct kvm_io_device_ops kvm_io_gic_ops = {
>  	.read = dispatch_mmio_read,
>  	.write = dispatch_mmio_write,
>  };
> +
> +int vgic_register_dist_iodev(struct kvm *kvm, gpa_t dist_base_address,
> +			     enum vgic_type type)
> +{
> +	struct vgic_io_device *io_device = &kvm->arch.vgic.dist_iodev;
> +	int ret = 0;
> +	unsigned int len;
> +
> +	switch (type) {
> +	case VGIC_V2:
> +		len = vgic_v2_init_dist_iodev(io_device);
> +		break;
> +	default:
> +		BUG_ON(1);
> +	}
> +
> +	io_device->base_addr = dist_base_address;
> +	io_device->redist_vcpu = NULL;
> +
> +	mutex_lock(&kvm->slots_lock);
> +	ret = kvm_io_bus_register_dev(kvm, KVM_MMIO_BUS, dist_base_address,
> +				      len, &io_device->dev);
> +	mutex_unlock(&kvm->slots_lock);
> +
> +	return ret;
> +}
> diff --git a/virt/kvm/arm/vgic/vgic-mmio.h b/virt/kvm/arm/vgic/vgic-mmio.h
> index 18d3869..4f4dd2b 100644
> --- a/virt/kvm/arm/vgic/vgic-mmio.h
> +++ b/virt/kvm/arm/vgic/vgic-mmio.h
> @@ -74,4 +74,6 @@ unsigned long vgic_mmio_read_rao(struct kvm_vcpu *vcpu,
>  void vgic_mmio_write_wi(struct kvm_vcpu *vcpu, gpa_t addr,
>  			unsigned int len, unsigned long val);
>  
> +unsigned int vgic_v2_init_dist_iodev(struct vgic_io_device *dev);
> +
>  #endif
> diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h
> index 81b1a20..fd9acaa 100644
> --- a/virt/kvm/arm/vgic/vgic.h
> +++ b/virt/kvm/arm/vgic/vgic.h
> @@ -27,6 +27,8 @@ void vgic_v2_fold_lr_state(struct kvm_vcpu *vcpu);
>  void vgic_v2_populate_lr(struct kvm_vcpu *vcpu, struct vgic_irq *irq, int lr);
>  void vgic_v2_clear_lr(struct kvm_vcpu *vcpu, int lr);
>  void vgic_v2_set_underflow(struct kvm_vcpu *vcpu);
> +int vgic_register_dist_iodev(struct kvm *kvm, gpa_t dist_base_address,
> +			     enum vgic_type);
>  
>  #ifdef CONFIG_KVM_ARM_VGIC_V3
>  void vgic_v3_process_maintenance(struct kvm_vcpu *vcpu);
> -- 
> 2.7.3
> 

Reviewed-by: Christoffer Dall <christoffer.dall at linaro.org>