diff options
Diffstat (limited to 'kernel/arch/x86/kvm/assigned-dev.c')
| -rw-r--r-- | kernel/arch/x86/kvm/assigned-dev.c | 62 |
1 files changed, 37 insertions, 25 deletions
diff --git a/kernel/arch/x86/kvm/assigned-dev.c b/kernel/arch/x86/kvm/assigned-dev.c index d090ecf08..9dc091acd 100644 --- a/kernel/arch/x86/kvm/assigned-dev.c +++ b/kernel/arch/x86/kvm/assigned-dev.c @@ -21,6 +21,7 @@ #include <linux/fs.h> #include "irq.h" #include "assigned-dev.h" +#include "trace/events/kvm.h" struct kvm_assigned_dev_kernel { struct kvm_irq_ack_notifier ack_notifier; @@ -131,7 +132,42 @@ static irqreturn_t kvm_assigned_dev_thread_intx(int irq, void *dev_id) return IRQ_HANDLED; } -#ifdef __KVM_HAVE_MSI +/* + * Deliver an IRQ in an atomic context if we can, or return a failure, + * user can retry in a process context. + * Return value: + * -EWOULDBLOCK - Can't deliver in atomic context: retry in a process context. + * Other values - No need to retry. + */ +static int kvm_set_irq_inatomic(struct kvm *kvm, int irq_source_id, u32 irq, + int level) +{ + struct kvm_kernel_irq_routing_entry entries[KVM_NR_IRQCHIPS]; + struct kvm_kernel_irq_routing_entry *e; + int ret = -EINVAL; + int idx; + + trace_kvm_set_irq(irq, level, irq_source_id); + + /* + * Injection into either PIC or IOAPIC might need to scan all CPUs, + * which would need to be retried from thread context; when same GSI + * is connected to both PIC and IOAPIC, we'd have to report a + * partial failure here. + * Since there's no easy way to do this, we only support injecting MSI + * which is limited to 1:1 GSI mapping. + */ + idx = srcu_read_lock(&kvm->irq_srcu); + if (kvm_irq_map_gsi(kvm, entries, irq) > 0) { + e = &entries[0]; + ret = kvm_arch_set_irq_inatomic(e, kvm, irq_source_id, + irq, level); + } + srcu_read_unlock(&kvm->irq_srcu, idx); + return ret; +} + + static irqreturn_t kvm_assigned_dev_msi(int irq, void *dev_id) { struct kvm_assigned_dev_kernel *assigned_dev = dev_id; @@ -150,9 +186,7 @@ static irqreturn_t kvm_assigned_dev_thread_msi(int irq, void *dev_id) return IRQ_HANDLED; } -#endif -#ifdef __KVM_HAVE_MSIX static irqreturn_t kvm_assigned_dev_msix(int irq, void *dev_id) { struct kvm_assigned_dev_kernel *assigned_dev = dev_id; @@ -183,7 +217,6 @@ static irqreturn_t kvm_assigned_dev_thread_msix(int irq, void *dev_id) return IRQ_HANDLED; } -#endif /* Ack the irq line for an assigned device */ static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian) @@ -386,7 +419,6 @@ static int assigned_device_enable_host_intx(struct kvm *kvm, return 0; } -#ifdef __KVM_HAVE_MSI static int assigned_device_enable_host_msi(struct kvm *kvm, struct kvm_assigned_dev_kernel *dev) { @@ -408,9 +440,7 @@ static int assigned_device_enable_host_msi(struct kvm *kvm, return 0; } -#endif -#ifdef __KVM_HAVE_MSIX static int assigned_device_enable_host_msix(struct kvm *kvm, struct kvm_assigned_dev_kernel *dev) { @@ -443,8 +473,6 @@ err: return r; } -#endif - static int assigned_device_enable_guest_intx(struct kvm *kvm, struct kvm_assigned_dev_kernel *dev, struct kvm_assigned_irq *irq) @@ -454,7 +482,6 @@ static int assigned_device_enable_guest_intx(struct kvm *kvm, return 0; } -#ifdef __KVM_HAVE_MSI static int assigned_device_enable_guest_msi(struct kvm *kvm, struct kvm_assigned_dev_kernel *dev, struct kvm_assigned_irq *irq) @@ -463,9 +490,7 @@ static int assigned_device_enable_guest_msi(struct kvm *kvm, dev->ack_notifier.gsi = -1; return 0; } -#endif -#ifdef __KVM_HAVE_MSIX static int assigned_device_enable_guest_msix(struct kvm *kvm, struct kvm_assigned_dev_kernel *dev, struct kvm_assigned_irq *irq) @@ -474,7 +499,6 @@ static int assigned_device_enable_guest_msix(struct kvm *kvm, dev->ack_notifier.gsi = -1; return 0; } -#endif static int assign_host_irq(struct kvm *kvm, struct kvm_assigned_dev_kernel *dev, @@ -492,16 +516,12 @@ static int assign_host_irq(struct kvm *kvm, case KVM_DEV_IRQ_HOST_INTX: r = assigned_device_enable_host_intx(kvm, dev); break; -#ifdef __KVM_HAVE_MSI case KVM_DEV_IRQ_HOST_MSI: r = assigned_device_enable_host_msi(kvm, dev); break; -#endif -#ifdef __KVM_HAVE_MSIX case KVM_DEV_IRQ_HOST_MSIX: r = assigned_device_enable_host_msix(kvm, dev); break; -#endif default: r = -EINVAL; } @@ -534,16 +554,12 @@ static int assign_guest_irq(struct kvm *kvm, case KVM_DEV_IRQ_GUEST_INTX: r = assigned_device_enable_guest_intx(kvm, dev, irq); break; -#ifdef __KVM_HAVE_MSI case KVM_DEV_IRQ_GUEST_MSI: r = assigned_device_enable_guest_msi(kvm, dev, irq); break; -#endif -#ifdef __KVM_HAVE_MSIX case KVM_DEV_IRQ_GUEST_MSIX: r = assigned_device_enable_guest_msix(kvm, dev, irq); break; -#endif default: r = -EINVAL; } @@ -826,7 +842,6 @@ out: } -#ifdef __KVM_HAVE_MSIX static int kvm_vm_ioctl_set_msix_nr(struct kvm *kvm, struct kvm_assigned_msix_nr *entry_nr) { @@ -906,7 +921,6 @@ msix_entry_out: return r; } -#endif static int kvm_vm_ioctl_set_pci_irq_mask(struct kvm *kvm, struct kvm_assigned_pci_dev *assigned_dev) @@ -1012,7 +1026,6 @@ long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl, goto out; break; } -#ifdef __KVM_HAVE_MSIX case KVM_ASSIGN_SET_MSIX_NR: { struct kvm_assigned_msix_nr entry_nr; r = -EFAULT; @@ -1033,7 +1046,6 @@ long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl, goto out; break; } -#endif case KVM_ASSIGN_SET_INTX_MASK: { struct kvm_assigned_pci_dev assigned_dev; |