kernel/arch/x86/kvm/irq.h, branch linux-rolling-stable

KVM: x86: Move kvm_irq_delivery_to_apic() from irq.c to lapic.c

2025-09-10T19:05:09Z

Move kvm_irq_delivery_to_apic() to lapic.c as it is specific to local APIC emulation. This will allow burying more local APIC code in lapic.c, e.g. the various "lowest priority" helpers. No functional change intended. Link: https://lore.kernel.org/r/20250821214209.3463350-2-seanjc@google.com Signed-off-by: Sean Christopherson

KVM: x86: Add CONFIG_KVM_IOAPIC to allow disabling in-kernel I/O APIC

2025-06-20T20:52:50Z

Add a Kconfig to allow building KVM without support for emulating a I/O APIC, PIC, and PIT, which is desirable for deployments that effectively don't support a fully in-kernel IRQ chip, i.e. never expect any VMM to create an in-kernel I/O APIC. E.g. compiling out support eliminates a few thousand lines of guest-facing code and gives security folks warm fuzzies. As a bonus, wrapping relevant paths with CONFIG_KVM_IOAPIC #ifdefs makes it much easier for readers to understand which bits and pieces exist specifically for fully in-kernel IRQ chips. Opportunistically convert all two in-kernel uses of __KVM_HAVE_IOAPIC to CONFIG_KVM_IOAPIC, e.g. rather than add a second #ifdef to generate a stub for kvm_arch_post_irq_routing_update(). Acked-by: Kai Huang Link: https://lore.kernel.org/r/20250611213557.294358-15-seanjc@google.com Signed-off-by: Sean Christopherson

KVM: x86: Move kvm_setup_default_irq_routing() into irq.c

2025-06-20T20:52:46Z

Move the default IRQ routing table used for in-kernel I/O APIC and PIC routing to irq.c, and tweak the name to make it explicitly clear what routing is being initialized. In addition to making it more obvious that the so called "default" routing only applies to an in-kernel I/O APIC, getting it out of irq_comm.c will allow removing irq_comm.c entirely. And placing the function alongside other I/O APIC and PIC code will allow for guarding KVM's in-kernel I/O APIC and PIC emulation with a Kconfig with minimal #ifdefs. No functional change intended. Cc: Kai Huang Acked-by: Kai Huang Link: https://lore.kernel.org/r/20250611213557.294358-9-seanjc@google.com Signed-off-by: Sean Christopherson

KVM: x86: Rename irqchip_kernel() to irqchip_full()

2025-06-20T20:52:45Z

Rename irqchip_kernel() to irqchip_full(), as "kernel" is very ambiguous due to the existence of split IRQ chip support, where only some of the "irqchip" is in emulated by the kernel/KVM. E.g. irqchip_kernel() often gets confused with irqchip_in_kernel(). Opportunistically hoist the definition up in irq.h so that it's co-located with other "full" irqchip code in anticipation of wrapping it all with a Kconfig/#ifdef. No functional change intended. Suggested-by: Paolo Bonzini Acked-by: Kai Huang Link: https://lore.kernel.org/r/20250611213557.294358-8-seanjc@google.com Signed-off-by: Sean Christopherson

KVM: x86: Move KVM_{GET,SET}_IRQCHIP ioctl helpers to irq.c

2025-06-20T20:52:45Z

Move the ioctl helpers for getting/setting fully in-kernel IRQ chip state to irq.c, partly to trim down x86.c, but mostly in preparation for adding a Kconfig to control support for in-kernel I/O APIC, PIC, and PIT emulation. No functional change intended. Acked-by: Kai Huang Link: https://lore.kernel.org/r/20250611213557.294358-7-seanjc@google.com Signed-off-by: Sean Christopherson

KVM: x86: Drop superfluous kvm_set_pic_irq() => kvm_pic_set_irq() wrapper

2025-06-20T20:52:42Z

Drop the superfluous and confusing kvm_set_pic_irq() => kvm_pic_set_irq() wrapper, and instead wire up ->set() directly to its final destination. Opportunistically move the declaration kvm_pic_set_irq() to irq.h to start gathering more of the in-kernel APIC/IO-APIC logic in irq.{c,h}. No functional change intended. Acked-by: Kai Huang Link: https://lore.kernel.org/r/20250611213557.294358-3-seanjc@google.com Signed-off-by: Sean Christopherson

KVM: x86: Don't re-setup empty IRQ routing when KVM_CAP_SPLIT_IRQCHIP

2024-06-11T21:18:40Z

Now that KVM sets up empty IRQ routing during VM creation, don't recreate empty routing during KVM_CAP_SPLIT_IRQCHIP. Setting IRQ routes during KVM_CAP_SPLIT_IRQCHIP can result in 20+ milliseconds of delay due to the synchronize_srcu_expedited() call in kvm_set_irq_routing(). Note, the empty routing is guaranteed to be intact as KVM x86 only allows changing the IRQ routing after an in-kernel IRQCHIP has been created, and KVM_CAP_SPLIT_IRQCHIP is disallowed after creating an IRQCHIP. Signed-off-by: Yi Wang Link: https://lore.kernel.org/r/20240506101751.3145407-3-foxywang@tencent.com [sean: massage changelog, remove unused empty_routing array] Signed-off-by: Sean Christopherson

x86/kvm: remove unused ack_notifier callbacks

2021-11-18T12:05:57Z

Commit f52447261bc8c2 ("KVM: irq ack notification") introduced an ack_notifier() callback in struct kvm_pic and in struct kvm_ioapic without using them anywhere. Remove those callbacks again. Signed-off-by: Juergen Gross Message-Id: <20211117071617.19504-1-jgross@suse.com> Signed-off-by: Paolo Bonzini

x86: Fix typo s/ECLR/ELCR/ for the PIC register

2021-08-10T21:31:44Z

The proper spelling for the acronym referring to the Edge/Level Control Register is ELCR rather than ECLR. Adjust references accordingly. No functional change. Signed-off-by: Maciej W. Rozycki Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/r/alpine.DEB.2.21.2107200251080.9461@angie.orcam.me.uk

kvm/x86: Remove redundant function implementations

2020-05-27T17:11:10Z

pic_in_kernel(), ioapic_in_kernel() and irqchip_kernel() have the same implementation. Signed-off-by: Peng Hao Message-Id: Signed-off-by: Paolo Bonzini