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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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13
include/hw/i386/pc.h
View file

@ -20,6 +20,19 @@
#define HPET_INTCAP "hpet-intcap"
#ifdef CONFIG_KVM
#define kvm_pit_in_kernel() \
(kvm_irqchip_in_kernel() && !kvm_irqchip_is_split())
#define kvm_pic_in_kernel() \
(kvm_irqchip_in_kernel() && !kvm_irqchip_is_split())
#define kvm_ioapic_in_kernel() \
(kvm_irqchip_in_kernel() && !kvm_irqchip_is_split())
#else
#define kvm_pit_in_kernel() 0
#define kvm_pic_in_kernel() 0
#define kvm_ioapic_in_kernel() 0
#endif
/**
* PCMachineState:
* @acpi_dev: link to ACPI PM device that performs ACPI hotplug handling