diff options
Diffstat (limited to 'arch/powerpc/kvm/book3s_xics.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_xics.c | 190 |
1 files changed, 165 insertions, 25 deletions
diff --git a/arch/powerpc/kvm/book3s_xics.c b/arch/powerpc/kvm/book3s_xics.c index ee841ed8a69..f7a10375661 100644 --- a/arch/powerpc/kvm/book3s_xics.c +++ b/arch/powerpc/kvm/book3s_xics.c @@ -11,6 +11,7 @@ #include <linux/kvm_host.h> #include <linux/err.h> #include <linux/gfp.h> +#include <linux/anon_inodes.h> #include <asm/uaccess.h> #include <asm/kvm_book3s.h> @@ -55,8 +56,6 @@ * * - Make ICS lockless as well, or at least a per-interrupt lock or hashed * locks array to improve scalability - * - * - ioctl's to save/restore the entire state for snapshot & migration */ /* -- ICS routines -- */ @@ -64,7 +63,8 @@ static void icp_deliver_irq(struct kvmppc_xics *xics, struct kvmppc_icp *icp, u32 new_irq); -static int ics_deliver_irq(struct kvmppc_xics *xics, u32 irq, u32 level) +static int ics_deliver_irq(struct kvmppc_xics *xics, u32 irq, u32 level, + bool report_status) { struct ics_irq_state *state; struct kvmppc_ics *ics; @@ -81,6 +81,9 @@ static int ics_deliver_irq(struct kvmppc_xics *xics, u32 irq, u32 level) if (!state->exists) return -EINVAL; + if (report_status) + return state->asserted; + /* * We set state->asserted locklessly. This should be fine as * we are the only setter, thus concurrent access is undefined @@ -96,7 +99,7 @@ static int ics_deliver_irq(struct kvmppc_xics *xics, u32 irq, u32 level) /* Attempt delivery */ icp_deliver_irq(xics, NULL, irq); - return 0; + return state->asserted; } static void ics_check_resend(struct kvmppc_xics *xics, struct kvmppc_ics *ics, @@ -891,8 +894,8 @@ static void xics_debugfs_init(struct kvmppc_xics *xics) kfree(name); } -struct kvmppc_ics *kvmppc_xics_create_ics(struct kvm *kvm, - struct kvmppc_xics *xics, int irq) +static struct kvmppc_ics *kvmppc_xics_create_ics(struct kvm *kvm, + struct kvmppc_xics *xics, int irq) { struct kvmppc_ics *ics; int i, icsid; @@ -1044,34 +1047,138 @@ int kvmppc_xics_set_icp(struct kvm_vcpu *vcpu, u64 icpval) return 0; } -/* -- ioctls -- */ +static int xics_get_source(struct kvmppc_xics *xics, long irq, u64 addr) +{ + int ret; + struct kvmppc_ics *ics; + struct ics_irq_state *irqp; + u64 __user *ubufp = (u64 __user *) addr; + u16 idx; + u64 val, prio; + + ics = kvmppc_xics_find_ics(xics, irq, &idx); + if (!ics) + return -ENOENT; -int kvm_vm_ioctl_xics_irq(struct kvm *kvm, struct kvm_irq_level *args) + irqp = &ics->irq_state[idx]; + mutex_lock(&ics->lock); + ret = -ENOENT; + if (irqp->exists) { + val = irqp->server; + prio = irqp->priority; + if (prio == MASKED) { + val |= KVM_XICS_MASKED; + prio = irqp->saved_priority; + } + val |= prio << KVM_XICS_PRIORITY_SHIFT; + if (irqp->asserted) + val |= KVM_XICS_LEVEL_SENSITIVE | KVM_XICS_PENDING; + else if (irqp->masked_pending || irqp->resend) + val |= KVM_XICS_PENDING; + ret = 0; + } + mutex_unlock(&ics->lock); + + if (!ret && put_user(val, ubufp)) + ret = -EFAULT; + + return ret; +} + +static int xics_set_source(struct kvmppc_xics *xics, long irq, u64 addr) { - struct kvmppc_xics *xics; - int r; + struct kvmppc_ics *ics; + struct ics_irq_state *irqp; + u64 __user *ubufp = (u64 __user *) addr; + u16 idx; + u64 val; + u8 prio; + u32 server; + + if (irq < KVMPPC_XICS_FIRST_IRQ || irq >= KVMPPC_XICS_NR_IRQS) + return -ENOENT; + + ics = kvmppc_xics_find_ics(xics, irq, &idx); + if (!ics) { + ics = kvmppc_xics_create_ics(xics->kvm, xics, irq); + if (!ics) + return -ENOMEM; + } + irqp = &ics->irq_state[idx]; + if (get_user(val, ubufp)) + return -EFAULT; + + server = val & KVM_XICS_DESTINATION_MASK; + prio = val >> KVM_XICS_PRIORITY_SHIFT; + if (prio != MASKED && + kvmppc_xics_find_server(xics->kvm, server) == NULL) + return -EINVAL; - /* locking against multiple callers? */ + mutex_lock(&ics->lock); + irqp->server = server; + irqp->saved_priority = prio; + if (val & KVM_XICS_MASKED) + prio = MASKED; + irqp->priority = prio; + irqp->resend = 0; + irqp->masked_pending = 0; + irqp->asserted = 0; + if ((val & KVM_XICS_PENDING) && (val & KVM_XICS_LEVEL_SENSITIVE)) + irqp->asserted = 1; + irqp->exists = 1; + mutex_unlock(&ics->lock); - xics = kvm->arch.xics; - if (!xics) - return -ENODEV; + if (val & KVM_XICS_PENDING) + icp_deliver_irq(xics, NULL, irqp->number); - switch (args->level) { - case KVM_INTERRUPT_SET: - case KVM_INTERRUPT_SET_LEVEL: - case KVM_INTERRUPT_UNSET: - r = ics_deliver_irq(xics, args->irq, args->level); - break; - default: - r = -EINVAL; + return 0; +} + +int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level, + bool line_status) +{ + struct kvmppc_xics *xics = kvm->arch.xics; + + return ics_deliver_irq(xics, irq, level, line_status); +} + +static int xics_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr) +{ + struct kvmppc_xics *xics = dev->private; + + switch (attr->group) { + case KVM_DEV_XICS_GRP_SOURCES: + return xics_set_source(xics, attr->attr, attr->addr); } + return -ENXIO; +} - return r; +static int xics_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr) +{ + struct kvmppc_xics *xics = dev->private; + + switch (attr->group) { + case KVM_DEV_XICS_GRP_SOURCES: + return xics_get_source(xics, attr->attr, attr->addr); + } + return -ENXIO; } -void kvmppc_xics_free(struct kvmppc_xics *xics) +static int xics_has_attr(struct kvm_device *dev, struct kvm_device_attr *attr) { + switch (attr->group) { + case KVM_DEV_XICS_GRP_SOURCES: + if (attr->attr >= KVMPPC_XICS_FIRST_IRQ && + attr->attr < KVMPPC_XICS_NR_IRQS) + return 0; + break; + } + return -ENXIO; +} + +static void kvmppc_xics_free(struct kvm_device *dev) +{ + struct kvmppc_xics *xics = dev->private; int i; struct kvm *kvm = xics->kvm; @@ -1083,17 +1190,21 @@ void kvmppc_xics_free(struct kvmppc_xics *xics) for (i = 0; i <= xics->max_icsid; i++) kfree(xics->ics[i]); kfree(xics); + kfree(dev); } -int kvm_xics_create(struct kvm *kvm, u32 type) +static int kvmppc_xics_create(struct kvm_device *dev, u32 type) { struct kvmppc_xics *xics; + struct kvm *kvm = dev->kvm; int ret = 0; xics = kzalloc(sizeof(*xics), GFP_KERNEL); if (!xics) return -ENOMEM; + dev->private = xics; + xics->dev = dev; xics->kvm = kvm; /* Already there ? */ @@ -1120,6 +1231,35 @@ int kvm_xics_create(struct kvm *kvm, u32 type) return 0; } +struct kvm_device_ops kvm_xics_ops = { + .name = "kvm-xics", + .create = kvmppc_xics_create, + .destroy = kvmppc_xics_free, + .set_attr = xics_set_attr, + .get_attr = xics_get_attr, + .has_attr = xics_has_attr, +}; + +int kvmppc_xics_connect_vcpu(struct kvm_device *dev, struct kvm_vcpu *vcpu, + u32 xcpu) +{ + struct kvmppc_xics *xics = dev->private; + int r = -EBUSY; + + if (dev->ops != &kvm_xics_ops) + return -EPERM; + if (xics->kvm != vcpu->kvm) + return -EPERM; + if (vcpu->arch.irq_type) + return -EBUSY; + + r = kvmppc_xics_create_icp(vcpu, xcpu); + if (!r) + vcpu->arch.irq_type = KVMPPC_IRQ_XICS; + + return r; +} + void kvmppc_xics_free_icp(struct kvm_vcpu *vcpu) { if (!vcpu->arch.icp) |