diff options
| -rw-r--r-- | hw/virtio-pci.c | 4 | ||||
| -rw-r--r-- | kvm-all.c | 1 | ||||
| -rw-r--r-- | kvm-stub.c | 1 | ||||
| -rw-r--r-- | kvm.h | 11 | ||||
| -rw-r--r-- | target-i386/kvm.c | 4 |
5 files changed, 18 insertions, 3 deletions
diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c index 125eded9ca..5e6e09efb7 100644 --- a/hw/virtio-pci.c +++ b/hw/virtio-pci.c @@ -627,7 +627,7 @@ static int virtio_pci_set_guest_notifiers(void *opaque, bool assign) int r, n; /* Must unset vector notifier while guest notifier is still assigned */ - if (kvm_irqchip_in_kernel() && !assign) { + if (kvm_msi_via_irqfd_enabled() && !assign) { msix_unset_vector_notifiers(&proxy->pci_dev); g_free(proxy->vector_irqfd); proxy->vector_irqfd = NULL; @@ -645,7 +645,7 @@ static int virtio_pci_set_guest_notifiers(void *opaque, bool assign) } /* Must set vector notifier after guest notifier has been assigned */ - if (kvm_irqchip_in_kernel() && assign) { + if (kvm_msi_via_irqfd_enabled() && assign) { proxy->vector_irqfd = g_malloc0(sizeof(*proxy->vector_irqfd) * msix_nr_vectors_allocated(&proxy->pci_dev)); @@ -102,6 +102,7 @@ KVMState *kvm_state; bool kvm_kernel_irqchip; bool kvm_async_interrupts_allowed; bool kvm_irqfds_allowed; +bool kvm_msi_via_irqfd_allowed; static const KVMCapabilityInfo kvm_required_capabilites[] = { KVM_CAP_INFO(USER_MEMORY), diff --git a/kvm-stub.c b/kvm-stub.c index 02e7fe0507..158bb7bee8 100644 --- a/kvm-stub.c +++ b/kvm-stub.c @@ -21,6 +21,7 @@ KVMState *kvm_state; bool kvm_kernel_irqchip; bool kvm_async_interrupts_allowed; bool kvm_irqfds_allowed; +bool kvm_msi_via_irqfd_allowed; int kvm_init_vcpu(CPUArchState *env) { @@ -26,6 +26,7 @@ extern int kvm_allowed; extern bool kvm_kernel_irqchip; extern bool kvm_async_interrupts_allowed; extern bool kvm_irqfds_allowed; +extern bool kvm_msi_via_irqfd_allowed; #if defined CONFIG_KVM || !defined NEED_CPU_H #define kvm_enabled() (kvm_allowed) @@ -50,11 +51,21 @@ extern bool kvm_irqfds_allowed; */ #define kvm_irqfds_enabled() (kvm_irqfds_allowed) +/** + * kvm_msi_via_irqfd_enabled: + * + * Returns: true if we can route a PCI MSI (Message Signaled Interrupt) + * to a KVM CPU via an irqfd. This requires that the kernel supports + * this and that we're running in a configuration that permits it. + */ +#define kvm_msi_via_irqfd_enabled() (kvm_msi_via_irqfd_allowed) + #else #define kvm_enabled() (0) #define kvm_irqchip_in_kernel() (false) #define kvm_async_interrupts_enabled() (false) #define kvm_irqfds_enabled() (false) +#define kvm_msi_via_irqfd_enabled() (false) #endif struct kvm_run; diff --git a/target-i386/kvm.c b/target-i386/kvm.c index 8c28fca4b6..7a874ea73b 100644 --- a/target-i386/kvm.c +++ b/target-i386/kvm.c @@ -2048,7 +2048,9 @@ void kvm_arch_init_irq_routing(KVMState *s) no_hpet = 1; } /* We know at this point that we're using the in-kernel - * irqchip, so we can use irqfds. + * irqchip, so we can use irqfds, and on x86 we know + * we can use msi via irqfd. */ kvm_irqfds_allowed = true; + kvm_msi_via_irqfd_allowed = true; } |