From: Vijaya Kumar K <vijaya.ku...@cavium.com> VGICv3 Distributor and Redistributor registers are accessed using KVM_DEV_ARM_VGIC_GRP_DIST_REGS and KVM_DEV_ARM_VGIC_GRP_DIST_REGS with KVM_SET_DEVICE_ATTR and KVM_GET_DEVICE_ATTR ioctls. These registers are accessed as 32-bit and cpu mpidr value passed along with register offset is used to identify the cpu for redistributor registers access.
The version of VGIC v3 specification is define here http://lists.infradead.org/pipermail/linux-arm-kernel/2016-July/445611.html Signed-off-by: Vijaya Kumar K <vijaya.ku...@cavium.com> --- arch/arm64/include/uapi/asm/kvm.h | 4 ++ virt/kvm/arm/vgic/vgic-kvm-device.c | 140 ++++++++++++++++++++++++++++++++++-- virt/kvm/arm/vgic/vgic-mmio-v2.c | 16 +---- virt/kvm/arm/vgic/vgic-mmio-v3.c | 72 +++++++++++++++++++ virt/kvm/arm/vgic/vgic-mmio.c | 22 ++++++ virt/kvm/arm/vgic/vgic-mmio.h | 4 ++ virt/kvm/arm/vgic/vgic.h | 5 ++ 7 files changed, 245 insertions(+), 18 deletions(-) diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h index 3051f86..56dc08d 100644 --- a/arch/arm64/include/uapi/asm/kvm.h +++ b/arch/arm64/include/uapi/asm/kvm.h @@ -201,10 +201,14 @@ struct kvm_arch_memory_slot { #define KVM_DEV_ARM_VGIC_GRP_CPU_REGS 2 #define KVM_DEV_ARM_VGIC_CPUID_SHIFT 32 #define KVM_DEV_ARM_VGIC_CPUID_MASK (0xffULL << KVM_DEV_ARM_VGIC_CPUID_SHIFT) +#define KVM_DEV_ARM_VGIC_V3_MPIDR_SHIFT 32 +#define KVM_DEV_ARM_VGIC_V3_MPIDR_MASK \ + (0xffffffffULL << KVM_DEV_ARM_VGIC_V3_MPIDR_SHIFT) #define KVM_DEV_ARM_VGIC_OFFSET_SHIFT 0 #define KVM_DEV_ARM_VGIC_OFFSET_MASK (0xffffffffULL << KVM_DEV_ARM_VGIC_OFFSET_SHIFT) #define KVM_DEV_ARM_VGIC_GRP_NR_IRQS 3 #define KVM_DEV_ARM_VGIC_GRP_CTRL 4 +#define KVM_DEV_ARM_VGIC_GRP_REDIST_REGS 5 #define KVM_DEV_ARM_VGIC_CTRL_INIT 0 /* Device Control API on vcpu fd */ diff --git a/virt/kvm/arm/vgic/vgic-kvm-device.c b/virt/kvm/arm/vgic/vgic-kvm-device.c index 163b057..3225388 100644 --- a/virt/kvm/arm/vgic/vgic-kvm-device.c +++ b/virt/kvm/arm/vgic/vgic-kvm-device.c @@ -320,9 +320,10 @@ static int vgic_attr_regs_access_v2(struct kvm_device *dev, mutex_lock(&dev->kvm->lock); - ret = vgic_init(dev->kvm); - if (ret) + if (unlikely(!vgic_initialized(dev->kvm))) { + ret = -EBUSY; goto out; + } if (!lock_all_vcpus(dev->kvm)) { ret = -EBUSY; @@ -433,16 +434,144 @@ struct kvm_device_ops kvm_arm_vgic_v2_ops = { #ifdef CONFIG_KVM_ARM_VGIC_V3 +static int parse_vgic_v3_attr(struct kvm_device *dev, + struct kvm_device_attr *attr, + struct vgic_reg_attr *reg_attr) +{ + unsigned long mpidr; + + mpidr = (attr->attr & KVM_DEV_ARM_VGIC_V3_MPIDR_MASK) >> + KVM_DEV_ARM_VGIC_V3_MPIDR_SHIFT; + + reg_attr->vcpu = kvm_mpidr_to_vcpu(dev->kvm, mpidr); + if (!reg_attr->vcpu) + return -EINVAL; + + if (reg_attr->vcpu->vcpu_id >= atomic_read(&dev->kvm->online_vcpus)) + return -EINVAL; + + reg_attr->addr = attr->attr & KVM_DEV_ARM_VGIC_OFFSET_MASK; + + return 0; +} + +/* + * vgic_attr_regs_access_v3 - allows user space to access VGIC v3 state + * + * @dev: kvm device handle + * @attr: kvm device attribute + * @reg: address the value is read or written + * @is_write: true if userspace is writing a register + */ +static int vgic_attr_regs_access_v3(struct kvm_device *dev, + struct kvm_device_attr *attr, + u64 *reg, bool is_write) +{ + struct vgic_reg_attr reg_attr; + gpa_t addr; + struct kvm_vcpu *vcpu; + int ret; + u32 tmp32; + + ret = parse_vgic_v3_attr(dev, attr, ®_attr); + if (ret) + return ret; + + vcpu = reg_attr.vcpu; + addr = reg_attr.addr; + + mutex_lock(&dev->kvm->lock); + + if (unlikely(!vgic_initialized(dev->kvm))) { + ret = -EBUSY; + goto out; + } + + if (!lock_all_vcpus(dev->kvm)) { + ret = -EBUSY; + goto out; + } + + switch (attr->group) { + case KVM_DEV_ARM_VGIC_GRP_DIST_REGS: + if (is_write) + tmp32 = *reg; + + ret = vgic_v3_dist_uaccess(vcpu, is_write, addr, &tmp32); + if (!is_write) + *reg = tmp32; + break; + case KVM_DEV_ARM_VGIC_GRP_REDIST_REGS: + if (is_write) + tmp32 = *reg; + + ret = vgic_v3_redist_uaccess(vcpu, is_write, addr, &tmp32); + if (!is_write) + *reg = tmp32; + break; + default: + ret = -EINVAL; + break; + } + + unlock_all_vcpus(dev->kvm); +out: + mutex_unlock(&dev->kvm->lock); + return ret; +} + static int vgic_v3_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr) { - return vgic_set_common_attr(dev, attr); + int ret; + + ret = vgic_set_common_attr(dev, attr); + if (ret != -ENXIO) + return ret; + + switch (attr->group) { + case KVM_DEV_ARM_VGIC_GRP_DIST_REGS: + case KVM_DEV_ARM_VGIC_GRP_REDIST_REGS: { + u32 __user *uaddr = (u32 __user *)(long)attr->addr; + u32 tmp32; + u64 reg; + + if (get_user(tmp32, uaddr)) + return -EFAULT; + + reg = tmp32; + return vgic_attr_regs_access_v3(dev, attr, ®, true); + } + } + return -ENXIO; } static int vgic_v3_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr) { - return vgic_get_common_attr(dev, attr); + int ret; + + ret = vgic_get_common_attr(dev, attr); + if (ret != -ENXIO) + return ret; + + switch (attr->group) { + case KVM_DEV_ARM_VGIC_GRP_DIST_REGS: + case KVM_DEV_ARM_VGIC_GRP_REDIST_REGS: { + u32 __user *uaddr = (u32 __user *)(long)attr->addr; + u64 reg; + u32 tmp32; + + ret = vgic_attr_regs_access_v3(dev, attr, ®, false); + if (ret) + return ret; + tmp32 = reg; + ret = put_user(tmp32, uaddr); + return ret; + } + } + + return -ENXIO; } static int vgic_v3_has_attr(struct kvm_device *dev, @@ -456,6 +585,9 @@ static int vgic_v3_has_attr(struct kvm_device *dev, return 0; } break; + case KVM_DEV_ARM_VGIC_GRP_DIST_REGS: + case KVM_DEV_ARM_VGIC_GRP_REDIST_REGS: + return vgic_v3_has_attr_regs(dev, attr); case KVM_DEV_ARM_VGIC_GRP_NR_IRQS: return 0; case KVM_DEV_ARM_VGIC_GRP_CTRL: diff --git a/virt/kvm/arm/vgic/vgic-mmio-v2.c b/virt/kvm/arm/vgic/vgic-mmio-v2.c index 0b32f40..2cb04b7 100644 --- a/virt/kvm/arm/vgic/vgic-mmio-v2.c +++ b/virt/kvm/arm/vgic/vgic-mmio-v2.c @@ -368,10 +368,9 @@ unsigned int vgic_v2_init_dist_iodev(struct vgic_io_device *dev) int vgic_v2_has_attr_regs(struct kvm_device *dev, struct kvm_device_attr *attr) { - int nr_irqs = dev->kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS; const struct vgic_register_region *regions; gpa_t addr; - int nr_regions, i, len; + int nr_regions; addr = attr->attr & KVM_DEV_ARM_VGIC_OFFSET_MASK; @@ -392,18 +391,7 @@ int vgic_v2_has_attr_regs(struct kvm_device *dev, struct kvm_device_attr *attr) if (addr & 3) return -ENXIO; - for (i = 0; i < nr_regions; i++) { - if (regions[i].bits_per_irq) - len = (regions[i].bits_per_irq * nr_irqs) / 8; - else - len = regions[i].len; - - if (regions[i].reg_offset <= addr && - regions[i].reg_offset + len > addr) - return 0; - } - - return -ENXIO; + return vgic_validate_mmio_region_addr(dev, regions, nr_regions, addr); } int vgic_v2_cpuif_uaccess(struct kvm_vcpu *vcpu, bool is_write, diff --git a/virt/kvm/arm/vgic/vgic-mmio-v3.c b/virt/kvm/arm/vgic/vgic-mmio-v3.c index 3b4d507..ffbe1ae 100644 --- a/virt/kvm/arm/vgic/vgic-mmio-v3.c +++ b/virt/kvm/arm/vgic/vgic-mmio-v3.c @@ -18,6 +18,8 @@ #include <kvm/arm_vgic.h> #include <asm/kvm_emulate.h> +#include <asm/kvm_arm.h> +#include <asm/kvm_mmu.h> #include "vgic.h" #include "vgic-mmio.h" @@ -379,6 +381,9 @@ static const struct vgic_register_region vgic_v3_dist_registers[] = { REGISTER_DESC_WITH_LENGTH(GICD_CTLR, vgic_mmio_read_v3_misc, vgic_mmio_write_v3_misc, 16, VGIC_ACCESS_32bit), + REGISTER_DESC_WITH_LENGTH(GICD_STATUSR, + vgic_mmio_read_rao, vgic_mmio_write_wi, 4, + VGIC_ACCESS_32bit), REGISTER_DESC_WITH_BITS_PER_IRQ_SHARED(GICD_IGROUPR, vgic_mmio_read_rao, vgic_mmio_write_wi, NULL, NULL, 1, VGIC_ACCESS_32bit), @@ -426,12 +431,18 @@ static const struct vgic_register_region vgic_v3_rdbase_registers[] = { REGISTER_DESC_WITH_LENGTH(GICR_CTLR, vgic_mmio_read_v3r_ctlr, vgic_mmio_write_v3r_ctlr, 4, VGIC_ACCESS_32bit), + REGISTER_DESC_WITH_LENGTH(GICR_STATUSR, + vgic_mmio_read_raz, vgic_mmio_write_wi, 4, + VGIC_ACCESS_32bit), REGISTER_DESC_WITH_LENGTH(GICR_IIDR, vgic_mmio_read_v3r_iidr, vgic_mmio_write_wi, 4, VGIC_ACCESS_32bit), REGISTER_DESC_WITH_LENGTH(GICR_TYPER, vgic_mmio_read_v3r_typer, vgic_mmio_write_wi, 8, VGIC_ACCESS_64bit | VGIC_ACCESS_32bit), + REGISTER_DESC_WITH_LENGTH(GICR_WAKER, + vgic_mmio_read_raz, vgic_mmio_write_wi, 8, + VGIC_ACCESS_32bit), REGISTER_DESC_WITH_LENGTH(GICR_PROPBASER, vgic_mmio_read_propbase, vgic_mmio_write_propbase, 8, VGIC_ACCESS_64bit | VGIC_ACCESS_32bit), @@ -552,6 +563,34 @@ int vgic_register_redist_iodevs(struct kvm *kvm, gpa_t redist_base_address) return ret; } +int vgic_v3_has_attr_regs(struct kvm_device *dev, struct kvm_device_attr *attr) +{ + const struct vgic_register_region *regions; + gpa_t addr; + int nr_regions; + + addr = attr->attr & KVM_DEV_ARM_VGIC_OFFSET_MASK; + + switch (attr->group) { + case KVM_DEV_ARM_VGIC_GRP_DIST_REGS: + regions = vgic_v3_dist_registers; + nr_regions = ARRAY_SIZE(vgic_v3_dist_registers); + break; + case KVM_DEV_ARM_VGIC_GRP_REDIST_REGS:{ + regions = vgic_v3_rdbase_registers; + nr_regions = ARRAY_SIZE(vgic_v3_rdbase_registers); + break; + } + default: + return -ENXIO; + } + + /* We only support aligned 32-bit accesses. */ + if (addr & 3) + return -ENXIO; + + return vgic_validate_mmio_region_addr(dev, regions, nr_regions, addr); +} /* * Compare a given affinity (level 1-3 and a level 0 mask, from the SGI * generation register ICC_SGI1R_EL1) with a given VCPU. @@ -658,3 +697,36 @@ void vgic_v3_dispatch_sgi(struct kvm_vcpu *vcpu, u64 reg) vgic_put_irq(vcpu->kvm, irq); } } + +int vgic_v3_dist_uaccess(struct kvm_vcpu *vcpu, bool is_write, + int offset, u32 *val) +{ + struct vgic_io_device dev = { + .regions = vgic_v3_dist_registers, + .nr_regions = ARRAY_SIZE(vgic_v3_dist_registers), + }; + + return vgic_uaccess(vcpu, &dev, is_write, offset, val); +} + +int vgic_v3_redist_uaccess(struct kvm_vcpu *vcpu, bool is_write, + int offset, u32 *val) +{ + struct vgic_io_device rd_dev = { + .regions = vgic_v3_rdbase_registers, + .nr_regions = ARRAY_SIZE(vgic_v3_rdbase_registers), + }; + + struct vgic_io_device sgi_dev = { + .regions = vgic_v3_sgibase_registers, + .nr_regions = ARRAY_SIZE(vgic_v3_sgibase_registers), + }; + + /* SGI_base is the next 64K frame after RD_base */ + if (offset >= SZ_64K) + return vgic_uaccess(vcpu, &sgi_dev, is_write, + offset - SZ_64K, val); + else + return vgic_uaccess(vcpu, &rd_dev, is_write, + offset, val); +} diff --git a/virt/kvm/arm/vgic/vgic-mmio.c b/virt/kvm/arm/vgic/vgic-mmio.c index 99d88a6..9294555 100644 --- a/virt/kvm/arm/vgic/vgic-mmio.c +++ b/virt/kvm/arm/vgic/vgic-mmio.c @@ -448,6 +448,28 @@ vgic_find_mmio_region(const struct vgic_register_region *region, int nr_regions, sizeof(region[0]), match_region); } +/* Check if address falls within the region */ +int vgic_validate_mmio_region_addr(struct kvm_device *dev, + const struct vgic_register_region *regions, + int nr_regions, gpa_t addr) +{ + int i, len; + int nr_irqs = dev->kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS; + + for (i = 0; i < nr_regions; i++) { + if (regions[i].bits_per_irq) + len = (regions[i].bits_per_irq * nr_irqs) / 8; + else + len = regions[i].len; + + if (regions[i].reg_offset <= addr && + regions[i].reg_offset + len > addr) + return 0; + } + + return -ENXIO; +} + /* * kvm_mmio_read_buf() returns a value in a format where it can be converted * to a byte array and be directly observed as the guest wanted it to appear diff --git a/virt/kvm/arm/vgic/vgic-mmio.h b/virt/kvm/arm/vgic/vgic-mmio.h index 3435f28..9a0109b 100644 --- a/virt/kvm/arm/vgic/vgic-mmio.h +++ b/virt/kvm/arm/vgic/vgic-mmio.h @@ -184,6 +184,10 @@ void vgic_mmio_write_config(struct kvm_vcpu *vcpu, int vgic_uaccess(struct kvm_vcpu *vcpu, struct vgic_io_device *dev, bool is_write, int offset, u32 *val); +int vgic_validate_mmio_region_addr(struct kvm_device *dev, + const struct vgic_register_region *regions, + int nr_regions, gpa_t addr); + unsigned int vgic_v2_init_dist_iodev(struct vgic_io_device *dev); unsigned int vgic_v3_init_dist_iodev(struct vgic_io_device *dev); diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h index 6c4625c..94b3479 100644 --- a/virt/kvm/arm/vgic/vgic.h +++ b/virt/kvm/arm/vgic/vgic.h @@ -89,6 +89,11 @@ 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); +int vgic_v3_has_attr_regs(struct kvm_device *dev, struct kvm_device_attr *attr); +int vgic_v3_dist_uaccess(struct kvm_vcpu *vcpu, bool is_write, + int offset, u32 *val); +int vgic_v3_redist_uaccess(struct kvm_vcpu *vcpu, bool is_write, + int offset, u32 *val); #else static inline void vgic_v3_process_maintenance(struct kvm_vcpu *vcpu) { -- 1.9.1 _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
