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authorSean Christopherson <seanjc@google.com>2025-06-11 15:45:29 -0700
committerSean Christopherson <seanjc@google.com>2025-06-23 09:50:28 -0700
commitf5369619f7f8add44fc5e3d05364d2ed293995fa (patch)
tree29e5a207d6e70db0dd602c0672a221d67b379014 /arch/x86/kvm/irq.c
parent0a64c447f6f81f79b69294c16b28680be59a3649 (diff)
KVM: x86: Move IRQ routing/delivery APIs from x86.c => irq.c
Move a bunch of IRQ routing and delivery APIs from x86.c to irq.c. x86.c has grown quite fat, and irq.c is the perfect landing spot. Opportunistically rewrite kvm_arch_irq_bypass_del_producer()'s comment, as the existing comment has several typos and is rather confusing. Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Link: https://lore.kernel.org/r/20250611224604.313496-28-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'arch/x86/kvm/irq.c')
-rw-r--r--arch/x86/kvm/irq.c88
1 files changed, 88 insertions, 0 deletions
diff --git a/arch/x86/kvm/irq.c b/arch/x86/kvm/irq.c
index a0b1499baf6e..f34c2deedf78 100644
--- a/arch/x86/kvm/irq.c
+++ b/arch/x86/kvm/irq.c
@@ -11,6 +11,7 @@
#include <linux/export.h>
#include <linux/kvm_host.h>
+#include <linux/kvm_irqfd.h>
#include "hyperv.h"
#include "ioapic.h"
@@ -332,6 +333,18 @@ int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,
return -EWOULDBLOCK;
}
+int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_event,
+ bool line_status)
+{
+ if (!irqchip_in_kernel(kvm))
+ return -ENXIO;
+
+ irq_event->status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID,
+ irq_event->irq, irq_event->level,
+ line_status);
+ return 0;
+}
+
bool kvm_arch_can_set_irq_routing(struct kvm *kvm)
{
return irqchip_in_kernel(kvm);
@@ -495,6 +508,81 @@ void kvm_arch_irq_routing_update(struct kvm *kvm)
kvm_make_scan_ioapic_request(kvm);
}
+int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *cons,
+ struct irq_bypass_producer *prod)
+{
+ struct kvm_kernel_irqfd *irqfd =
+ container_of(cons, struct kvm_kernel_irqfd, consumer);
+ struct kvm *kvm = irqfd->kvm;
+ int ret = 0;
+
+ kvm_arch_start_assignment(irqfd->kvm);
+
+ spin_lock_irq(&kvm->irqfds.lock);
+ irqfd->producer = prod;
+
+ if (irqfd->irq_entry.type == KVM_IRQ_ROUTING_MSI) {
+ ret = kvm_x86_call(pi_update_irte)(irqfd, irqfd->kvm, prod->irq,
+ irqfd->gsi, &irqfd->irq_entry);
+ if (ret)
+ kvm_arch_end_assignment(irqfd->kvm);
+ }
+ spin_unlock_irq(&kvm->irqfds.lock);
+
+ return ret;
+}
+
+void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *cons,
+ struct irq_bypass_producer *prod)
+{
+ struct kvm_kernel_irqfd *irqfd =
+ container_of(cons, struct kvm_kernel_irqfd, consumer);
+ struct kvm *kvm = irqfd->kvm;
+ int ret;
+
+ WARN_ON(irqfd->producer != prod);
+
+ /*
+ * If the producer of an IRQ that is currently being posted to a vCPU
+ * is unregistered, change the associated IRTE back to remapped mode as
+ * the IRQ has been released (or repurposed) by the device driver, i.e.
+ * KVM must relinquish control of the IRTE.
+ */
+ spin_lock_irq(&kvm->irqfds.lock);
+ irqfd->producer = NULL;
+
+ if (irqfd->irq_entry.type == KVM_IRQ_ROUTING_MSI) {
+ ret = kvm_x86_call(pi_update_irte)(irqfd, irqfd->kvm, prod->irq,
+ irqfd->gsi, NULL);
+ if (ret)
+ pr_info("irq bypass consumer (eventfd %p) unregistration fails: %d\n",
+ irqfd->consumer.eventfd, ret);
+ }
+
+ spin_unlock_irq(&kvm->irqfds.lock);
+
+
+ kvm_arch_end_assignment(irqfd->kvm);
+}
+
+int kvm_arch_update_irqfd_routing(struct kvm_kernel_irqfd *irqfd,
+ struct kvm_kernel_irq_routing_entry *old,
+ struct kvm_kernel_irq_routing_entry *new)
+{
+ return kvm_x86_call(pi_update_irte)(irqfd, irqfd->kvm, irqfd->producer->irq,
+ irqfd->gsi, new);
+}
+
+bool kvm_arch_irqfd_route_changed(struct kvm_kernel_irq_routing_entry *old,
+ struct kvm_kernel_irq_routing_entry *new)
+{
+ if (old->type != KVM_IRQ_ROUTING_MSI ||
+ new->type != KVM_IRQ_ROUTING_MSI)
+ return true;
+
+ return !!memcmp(&old->msi, &new->msi, sizeof(new->msi));
+}
+
#ifdef CONFIG_KVM_IOAPIC
#define IOAPIC_ROUTING_ENTRY(irq) \
{ .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \