[PATCH v4 05/12] KVM: arm64: introduce ITS emulation file with stub functions
Marc Zyngier
marc.zyngier at arm.com
Thu Apr 7 07:04:55 PDT 2016
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.
> + 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,
>
--
Jazz is not dead. It just smells funny...
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