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kvm: x86: add support for KVM_CAP_SPLIT_IRQCHIP

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This patch adds support for split IRQ chip mode. When
KVM_CAP_SPLIT_IRQCHIP is enabled:

    1.) The PIC, PIT, and IOAPIC are implemented in userspace while
    the LAPIC is implemented by KVM.

    2.) The software IOAPIC delivers interrupts to the KVM LAPIC via
    kvm_set_irq. Interrupt delivery is configured via the MSI routing
    table, for which routes are reserved in target-i386/kvm.c then
    configured in hw/intc/ioapic.c

    3.) KVM delivers IOAPIC EOIs via a new exit KVM_EXIT_IOAPIC_EOI,
    which is handled in target-i386/kvm.c and relayed to the software
    IOAPIC via ioapic_eoi_broadcast.

Signed-off-by: Matt Gingell <gingell@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2015-12-17 17:16:08 +01:00
parent 32c18a2dba
commit 15eafc2e60
11 changed files with 148 additions and 14 deletions
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6
include/sysemu/kvm.h
View file

@ -174,6 +174,7 @@ extern bool kvm_ioeventfd_any_length_allowed;
#else
#define kvm_enabled() (0)
#define kvm_irqchip_in_kernel() (false)
#define kvm_irqchip_is_split() (false)
#define kvm_async_interrupts_enabled() (false)
#define kvm_halt_in_kernel() (false)
#define kvm_eventfds_enabled() (false)
@ -317,6 +318,8 @@ MemTxAttrs kvm_arch_post_run(CPUState *cpu, struct kvm_run *run);
int kvm_arch_handle_exit(CPUState *cpu, struct kvm_run *run);
int kvm_arch_handle_ioapic_eoi(CPUState *cpu, struct kvm_run *run);
int kvm_arch_process_async_events(CPUState *cpu);
int kvm_arch_get_registers(CPUState *cpu);
@ -484,6 +487,7 @@ void kvm_init_irq_routing(KVMState *s);
/**
* kvm_arch_irqchip_create:
* @KVMState: The KVMState pointer
* @MachineState: The MachineState pointer
*
* Allow architectures to create an in-kernel irq chip themselves.
*
@ -491,7 +495,7 @@ void kvm_init_irq_routing(KVMState *s);
* 0: irq chip was not created
* > 0: irq chip was created
*/
int kvm_arch_irqchip_create(KVMState *s);
int kvm_arch_irqchip_create(MachineState *ms, KVMState *s);
/**
* kvm_set_one_reg - set a register value in KVM via KVM_SET_ONE_REG ioctl