APIC virtualization is a new feature which can eliminate most of VM exit
when vcpu handle a interrupt:
APIC register virtualization:
APIC read access doesn't cause APIC-access VM exits.
APIC write becomes trap-like.
Virtual interrupt delivery:
Virtual interrupt delivery avoids KVM to inject vAPIC interrupts
manually, which is fully taken care of by the hardware.
Posted Interrupt:
Posted Interrupt allows vAPICV interrupts to inject into guest directly
without cause VM exit
Please refer to Intel SDM volume 3, chapter 29 for more details.
Changes v1 to v2:
* Add Posted Interrupt support in this series patch.
* Since there is a notifer hook in vAPIC EOI for PIT interrupt. So always Set
PIT
interrupt in eoi exit bitmap to force vmexit when EOI to interrupt.
* Rebased on top of KVM upstream
Yang Zhang (6):
x86: PIT connects to pin 2 of IOAPIC
x86, apicv: add APICv register virtualization support
x86, apicv: add virtual interrupt delivery support
x86, apicv: add virtual x2apic support
x86: Enable ack interrupt on vmexit
x86, apicv: Add Posted Interrupt supporting
arch/x86/include/asm/kvm_host.h | 7 +
arch/x86/include/asm/vmx.h | 17 ++
arch/x86/kernel/apic/io_apic.c | 138 +++++++++++++
arch/x86/kvm/irq.c | 44 ++++
arch/x86/kvm/lapic.c | 91 ++++++++-
arch/x86/kvm/lapic.h | 23 ++
arch/x86/kvm/svm.c | 6 +
arch/x86/kvm/vmx.c | 420 +++++++++++++++++++++++++++++++++++++--
arch/x86/kvm/x86.c | 18 ++-
include/linux/kvm_host.h | 1 +
virt/kvm/ioapic.c | 3 +-
virt/kvm/kvm_main.c | 2 +
12 files changed, 749 insertions(+), 21 deletions(-)
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