4.52 KVM_SET_GSI_ROUTING
Capability: KVM_CAP_IRQ_ROUTING
-Architectures: x86 s390
+Architectures: x86 s390 arm arm64
Type: vm ioctl
Parameters: struct kvm_irq_routing (in)
Returns: 0 on success, -1 on error
Sets the GSI routing table entries, overwriting any previously set entries.
+On arm/arm64, GSI routing has the following limitation:
+- GSI routing does not apply to KVM_IRQ_LINE but only to KVM_IRQFD.
+
struct kvm_irq_routing {
__u32 nr;
__u32 flags;
irqfd. The KVM_IRQFD_FLAG_RESAMPLE is only necessary on assignment
and need not be specified with KVM_IRQFD_FLAG_DEASSIGN.
-On ARM/ARM64, the gsi field in the kvm_irqfd struct specifies the Shared
-Peripheral Interrupt (SPI) index, such that the GIC interrupt ID is
-given by gsi + 32.
+On arm/arm64, gsi routing being supported, the following can happen:
+- in case no routing entry is associated to this gsi, injection fails
+- in case the gsi is associated to an irqchip routing entry,
+ irqchip.pin + 32 corresponds to the injected SPI ID.
4.76 KVM_PPC_ALLOCATE_HTAB
#include <linux/kvm.h>
#include <linux/kvm_host.h>
#include <trace/events/kvm.h>
+#include <kvm/arm_vgic.h>
+#include "vgic.h"
-int kvm_irq_map_gsi(struct kvm *kvm,
- struct kvm_kernel_irq_routing_entry *entries,
- int gsi)
+/**
+ * vgic_irqfd_set_irq: inject the IRQ corresponding to the
+ * irqchip routing entry
+ *
+ * This is the entry point for irqfd IRQ injection
+ */
+static int vgic_irqfd_set_irq(struct kvm_kernel_irq_routing_entry *e,
+ struct kvm *kvm, int irq_source_id,
+ int level, bool line_status)
{
- return 0;
+ unsigned int spi_id = e->irqchip.pin + VGIC_NR_PRIVATE_IRQS;
+
+ if (!vgic_valid_spi(kvm, spi_id))
+ return -EINVAL;
+ return kvm_vgic_inject_irq(kvm, 0, spi_id, level);
}
-int kvm_irq_map_chip_pin(struct kvm *kvm, unsigned int irqchip,
- unsigned int pin)
+/**
+ * kvm_set_routing_entry: populate a kvm routing entry
+ * from a user routing entry
+ *
+ * @e: kvm kernel routing entry handle
+ * @ue: user api routing entry handle
+ * return 0 on success, -EINVAL on errors.
+ */
+int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
+ const struct kvm_irq_routing_entry *ue)
{
- return pin;
+ int r = -EINVAL;
+
+ switch (ue->type) {
+ case KVM_IRQ_ROUTING_IRQCHIP:
+ e->set = vgic_irqfd_set_irq;
+ e->irqchip.irqchip = ue->u.irqchip.irqchip;
+ e->irqchip.pin = ue->u.irqchip.pin;
+ if ((e->irqchip.pin >= KVM_IRQCHIP_NUM_PINS) ||
+ (e->irqchip.irqchip >= KVM_NR_IRQCHIPS))
+ goto out;
+ break;
+ default:
+ goto out;
+ }
+ r = 0;
+out:
+ return r;
}
-int kvm_set_irq(struct kvm *kvm, int irq_source_id,
- u32 irq, int level, bool line_status)
+/**
+ * kvm_set_msi: inject the MSI corresponding to the
+ * MSI routing entry
+ *
+ * This is the entry point for irqfd MSI injection
+ * and userspace MSI injection.
+ */
+int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
+ struct kvm *kvm, int irq_source_id,
+ int level, bool line_status)
{
- unsigned int spi = irq + VGIC_NR_PRIVATE_IRQS;
+ struct kvm_msi msi;
- trace_kvm_set_irq(irq, level, irq_source_id);
+ msi.address_lo = e->msi.address_lo;
+ msi.address_hi = e->msi.address_hi;
+ msi.data = e->msi.data;
+ msi.flags = e->msi.flags;
+ msi.devid = e->msi.devid;
- BUG_ON(!vgic_initialized(kvm));
+ if (!vgic_has_its(kvm))
+ return -ENODEV;
- return kvm_vgic_inject_irq(kvm, 0, spi, level);
+ return vgic_its_inject_msi(kvm, &msi);
}
-/* MSI not implemented yet */
-int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
- struct kvm *kvm, int irq_source_id,
- int level, bool line_status)
+int kvm_vgic_setup_default_irq_routing(struct kvm *kvm)
{
- return 0;
+ struct kvm_irq_routing_entry *entries;
+ struct vgic_dist *dist = &kvm->arch.vgic;
+ u32 nr = dist->nr_spis;
+ int i, ret;
+
+ entries = kcalloc(nr, sizeof(struct kvm_kernel_irq_routing_entry),
+ GFP_KERNEL);
+ if (!entries)
+ return -ENOMEM;
+
+ for (i = 0; i < nr; i++) {
+ entries[i].gsi = i;
+ entries[i].type = KVM_IRQ_ROUTING_IRQCHIP;
+ entries[i].u.irqchip.irqchip = 0;
+ entries[i].u.irqchip.pin = i;
+ }
+ ret = kvm_set_irq_routing(kvm, entries, nr, 0);
+ kfree(entries);
+ return ret;
}
projects / linux.git / commitdiff