[PATCH v4 05/12] KVM: arm64: introduce ITS emulation file with stub functions

[marc.zyngier@arm.com (Marc Zyngier)]

Hi Eric,

On 07/04/16 15:08, Eric Auger wrote:
> Hi Marc,
> On 04/07/2016 04:04 PM, Marc Zyngier wrote:
>> On 26/03/16 02:14, Andre Przywara wrote:
>>> The ARM GICv3 ITS emulation code goes into a separate file, but
>>> needs to be connected to the GICv3 emulation, of which it is an
>>> option.
>>> Introduce the skeleton with function stubs to be filled later.
>>> Introduce the basic ITS data structure and initialize it, but don't
>>> return any success yet, as we are not yet ready for the show.
>>>
>>> Signed-off-by: Andre Przywara <andre.przywara@arm.com>
>>> ---
>>>  arch/arm64/kvm/Makefile            |  1 +
>>>  include/kvm/vgic/vgic.h            |  6 +++
>>>  include/linux/irqchip/arm-gic-v3.h |  1 +
>>>  virt/kvm/arm/vgic/its-emul.c       | 84 ++++++++++++++++++++++++++++++++++++++
>>>  virt/kvm/arm/vgic/vgic.h           | 14 +++++++
>>>  virt/kvm/arm/vgic/vgic_init.c      |  6 +++
>>>  virt/kvm/arm/vgic/vgic_mmio.c      | 18 ++++++--
>>>  7 files changed, 126 insertions(+), 4 deletions(-)
>>>  create mode 100644 virt/kvm/arm/vgic/its-emul.c
>>>
>>> diff --git a/arch/arm64/kvm/Makefile b/arch/arm64/kvm/Makefile
>>> index 2f5d431..3bec10e 100644
>>> --- a/arch/arm64/kvm/Makefile
>>> +++ b/arch/arm64/kvm/Makefile
>>> @@ -28,6 +28,7 @@ kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-v2.o
>>>  kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-v3.o
>>>  kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic_mmio.o
>>>  kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic_kvm_device.o
>>> +kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/its-emul.o
>>>  else
>>>  kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic.o
>>>  kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic-v2.o
>>> diff --git a/include/kvm/vgic/vgic.h b/include/kvm/vgic/vgic.h
>>> index 8ea5dd7..c79bed5 100644
>>> --- a/include/kvm/vgic/vgic.h
>>> +++ b/include/kvm/vgic/vgic.h
>>> @@ -112,6 +112,11 @@ struct vgic_io_device {
>>>  	struct kvm_io_device dev;
>>>  };
>>>  
>>> +struct vgic_its {
>>> +	bool			enabled;
>>> +	spinlock_t		lock;
>>> +};
>>> +
>>>  struct vgic_dist {
>>>  	bool			in_kernel;
>>>  	bool			ready;
>>> @@ -153,6 +158,7 @@ struct vgic_dist {
>>>  	u64			*pendbaser;
>>>  
>>>  	bool			lpis_enabled;
>>> +	struct vgic_its		its;
>>>  };
>>>  
>>>  struct vgic_v2_cpu_if {
>>> diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h
>>> index d5d798b..a813c3e 100644
>>> --- a/include/linux/irqchip/arm-gic-v3.h
>>> +++ b/include/linux/irqchip/arm-gic-v3.h
>>> @@ -177,6 +177,7 @@
>>>  #define GITS_CWRITER			0x0088
>>>  #define GITS_CREADR			0x0090
>>>  #define GITS_BASER			0x0100
>>> +#define GITS_IDREGS_BASE		0xffd0
>>>  #define GITS_PIDR2			GICR_PIDR2
>>>  
>>>  #define GITS_TRANSLATER			0x10040
>>> diff --git a/virt/kvm/arm/vgic/its-emul.c b/virt/kvm/arm/vgic/its-emul.c
>>> new file mode 100644
>>> index 0000000..49dd5e4
>>> --- /dev/null
>>> +++ b/virt/kvm/arm/vgic/its-emul.c
>>> @@ -0,0 +1,84 @@
>>> +/*
>>> + * GICv3 ITS emulation
>>> + *
>>> + * Copyright (C) 2015 ARM Ltd.
>>> + * Author: Andre Przywara <andre.przywara@arm.com>
>>> + *
>>> + * 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.
>>> + *
>>> + * You should have received a copy of the GNU General Public License
>>> + * along with this program.  If not, see <http://www.gnu.org/licenses/>.
>>> + */
>>> +
>>> +#include <linux/cpu.h>
>>> +#include <linux/kvm.h>
>>> +#include <linux/kvm_host.h>
>>> +#include <linux/interrupt.h>
>>> +
>>> +#include <linux/irqchip/arm-gic-v3.h>
>>> +
>>> +#include <asm/kvm_emulate.h>
>>> +#include <asm/kvm_arm.h>
>>> +#include <asm/kvm_mmu.h>
>>> +
>>> +#include "vgic.h"
>>> +#include "vgic_mmio.h"
>>> +
>>> +struct vgic_register_region its_registers[] = {
>>> +	REGISTER_DESC_WITH_LENGTH(GITS_CTLR,
>>> +		vgic_mmio_read_raz, vgic_mmio_write_wi, 4),
>>> +	REGISTER_DESC_WITH_LENGTH(GITS_IIDR,
>>> +		vgic_mmio_read_raz, vgic_mmio_write_wi, 4),
>>> +	REGISTER_DESC_WITH_LENGTH(GITS_TYPER,
>>> +		vgic_mmio_read_raz, vgic_mmio_write_wi, 4),
>>
>> GITS_TYPER is a 64bit register with plenty of things in the upper bits.
> In practice I think the 32 upper bits are reserved.

Not quite. Only bits [63:38] are reserved. See 8.19.8 in the
Architecture Specification (IHI 0069B).

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...