[PATCH v4 05/12] KVM: arm64: introduce ITS emulation file with stub functions
Eric Auger
eric.auger at linaro.org
Thu Apr 7 07:08:35 PDT 2016
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 at 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 at 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.
Eric
>
>> + REGISTER_DESC_WITH_LENGTH(GITS_CBASER,
>> + vgic_mmio_read_raz, vgic_mmio_write_wi, 8),
>> + REGISTER_DESC_WITH_LENGTH(GITS_CWRITER,
>> + vgic_mmio_read_raz, vgic_mmio_write_wi, 8),
>> + REGISTER_DESC_WITH_LENGTH(GITS_CREADR,
>> + vgic_mmio_read_raz, vgic_mmio_write_wi, 8),
>> + REGISTER_DESC_WITH_LENGTH(GITS_BASER,
>> + vgic_mmio_read_raz, vgic_mmio_write_wi, 0x40),
>> + REGISTER_DESC_WITH_LENGTH(GITS_IDREGS_BASE,
>> + vgic_mmio_read_raz, vgic_mmio_write_wi, 0x30),
>> +};
>> +
>> +/* This is called on setting the LPI enable bit in the redistributor. */
>> +void vgic_enable_lpis(struct kvm_vcpu *vcpu)
>> +{
>> +}
>> +
>> +int vits_init(struct kvm *kvm)
>> +{
>> + struct vgic_dist *dist = &kvm->arch.vgic;
>> + struct vgic_its *its = &dist->its;
>> + struct vgic_io_device *regions;
>> + int ret, i;
>> +
>> + spin_lock_init(&its->lock);
>> +
>> + regions = kmalloc_array(ARRAY_SIZE(its_registers),
>> + sizeof(struct vgic_io_device), GFP_KERNEL);
>> +
>> + for (i = 0; i < ARRAY_SIZE(its_registers); i++) {
>> + regions[i].base_addr = dist->vgic_its_base;
>> +
>> + ret = kvm_vgic_register_mmio_region(kvm, NULL,
>> + &its_registers[i],
>> + ®ions[i], 0, false);
>> + }
>> +
>> + if (ret)
>> + return ret;
>> +
>> + its->enabled = false;
>> +
>> + return -ENXIO;
>> +}
>> diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h
>> index db9dfd7..4e7dcb8 100644
>> --- a/virt/kvm/arm/vgic/vgic.h
>> +++ b/virt/kvm/arm/vgic/vgic.h
>> @@ -60,6 +60,9 @@ void vgic_v3_enable(struct kvm_vcpu *vcpu);
>> int vgic_v3_probe(struct device_node *vgic_node);
>> int vgic_v3_map_resources(struct kvm *kvm);
>> int vgic_register_redist_regions(struct kvm *kvm, gpa_t dist_base_address);
>> +
>> +int vits_init(struct kvm *kvm);
>> +void vgic_enable_lpis(struct kvm_vcpu *vcpu);
>> #else
>> static inline void vgic_v3_irq_change_affinity(struct kvm *kvm, u32 intid,
>> u64 mpidr)
>> @@ -124,6 +127,16 @@ static inline int vgic_register_redist_regions(struct kvm *kvm,
>> {
>> return -ENODEV;
>> }
>> +
>> +int vits_init(struct kvm *kvm)
>> +{
>> + return 0;
>> +}
>> +
>> +static inline void vgic_enable_lpis(struct kvm_vcpu *vcpu)
>> +{
>> + return;
>> +}
>> #endif
>>
>> void vgic_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
>> @@ -131,6 +144,7 @@ void vgic_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
>>
>> int vgic_lazy_init(struct kvm *kvm);
>> int vgic_init(struct kvm *kvm);
>> +int vits_init(struct kvm *kvm);
>> void kvm_register_vgic_device(unsigned long type);
>>
>> #endif
>> diff --git a/virt/kvm/arm/vgic/vgic_init.c b/virt/kvm/arm/vgic/vgic_init.c
>> index 2301e03..dcfb93d 100644
>> --- a/virt/kvm/arm/vgic/vgic_init.c
>> +++ b/virt/kvm/arm/vgic/vgic_init.c
>> @@ -252,6 +252,12 @@ int vgic_init(struct kvm *kvm)
>> if (ret)
>> goto out;
>>
>> + if (vgic_has_its(kvm)) {
>> + ret = vits_init(kvm);
>> + if (ret)
>> + goto out;
>> + }
>
> You can move the vgic_has_its() test inside vits_init().
>
>> +
>> kvm_for_each_vcpu(i, vcpu, kvm)
>> kvm_vgic_vcpu_init(vcpu);
>>
>> diff --git a/virt/kvm/arm/vgic/vgic_mmio.c b/virt/kvm/arm/vgic/vgic_mmio.c
>> index 252b9aff..086555e 100644
>> --- a/virt/kvm/arm/vgic/vgic_mmio.c
>> +++ b/virt/kvm/arm/vgic/vgic_mmio.c
>> @@ -726,16 +726,26 @@ static int vgic_mmio_read_v3r_misc(struct kvm_vcpu *vcpu,
>> struct kvm_io_device *this,
>> gpa_t addr, int len, void *val)
>> {
>> - /* TODO: implement for ITS support */
>> - return vgic_mmio_read_raz(vcpu, this, addr, len, val);
>> + struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
>> + u32 reg = dist->lpis_enabled ? GICR_CTLR_ENABLE_LPIS : 0;
>> +
>> + write_mask32(reg, addr & 3, len, val);
>> + return 0;
>> }
>>
>> static int vgic_mmio_write_v3r_misc(struct kvm_vcpu *vcpu,
>> struct kvm_io_device *this,
>> gpa_t addr, int len, const void *val)
>> {
>> - /* TODO: implement for ITS support */
>> - return vgic_mmio_write_wi(vcpu, this, addr, len, val);
>> + struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
>> + u32 reg = mask32(!!dist->lpis_enabled, addr & 3, len, val);
>> +
>> + if (vgic_has_its(vcpu->kvm) && !dist->lpis_enabled &&
>> + (reg & GICR_CTLR_ENABLE_LPIS)) {
>> + /* Eventually do something */
>> + }
>> +
>> + return 0;
>> }
>>
>> static int vgic_mmio_read_v3r_iidr(struct kvm_vcpu *vcpu,
>>
>
>
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