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Commit d78f2664 authored by Yang Zhang's avatar Yang Zhang Committed by Marcelo Tosatti
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KVM: VMX: Register a new IPI for posted interrupt 



Posted Interrupt feature requires a special IPI to deliver posted interrupt
to guest. And it should has a high priority so the interrupt will not be
blocked by others.
Normally, the posted interrupt will be consumed by vcpu if target vcpu is
running and transparent to OS. But in some cases, the interrupt will arrive
when target vcpu is scheduled out. And host will see it. So we need to
register a dump handler to handle it.

Signed-off-by: default avatarYang Zhang <yang.z.zhang@Intel.com>
Acked-by: default avatarIngo Molnar <mingo@kernel.org>
Reviewed-by: default avatarGleb Natapov <gleb@redhat.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent a547c6db

arch/x86/include/asm/entry_arch.h

+4 −0
Original line number Diff line number Diff line
@@ -19,6 +19,10 @@ BUILD_INTERRUPT(reboot_interrupt,REBOOT_VECTOR) 


BUILD_INTERRUPT(x86_platform_ipi, X86_PLATFORM_IPI_VECTOR)



#ifdef CONFIG_HAVE_KVM

BUILD_INTERRUPT(kvm_posted_intr_ipi, POSTED_INTR_VECTOR)

#endif



/*

 * every pentium local APIC has two 'local interrupts', with a

 * soft-definable vector attached to both interrupts, one of

arch/x86/include/asm/hardirq.h

+3 −0
Original line number Diff line number Diff line
@@ -11,6 +11,9 @@ typedef struct { 
	unsigned int apic_timer_irqs;	/* arch dependent */

	unsigned int irq_spurious_count;

	unsigned int icr_read_retry_count;

#endif

#ifdef CONFIG_HAVE_KVM

	unsigned int kvm_posted_intr_ipis;

#endif

	unsigned int x86_platform_ipis;	/* arch dependent */

	unsigned int apic_perf_irqs;

arch/x86/include/asm/hw_irq.h

+1 −0
Original line number Diff line number Diff line
@@ -28,6 +28,7 @@ 
/* Interrupt handlers registered during init_IRQ */

extern void apic_timer_interrupt(void);

extern void x86_platform_ipi(void);

extern void kvm_posted_intr_ipi(void);

extern void error_interrupt(void);

extern void irq_work_interrupt(void);

arch/x86/include/asm/irq_vectors.h

+5 −0
Original line number Diff line number Diff line
@@ -102,6 +102,11 @@ 
 */

#define X86_PLATFORM_IPI_VECTOR		0xf7



/* Vector for KVM to deliver posted interrupt IPI */

#ifdef CONFIG_HAVE_KVM

#define POSTED_INTR_VECTOR		0xf2

#endif



/*

 * IRQ work vector:

 */

arch/x86/kernel/entry_64.S

+5 −0
Original line number Diff line number Diff line
@@ -1166,6 +1166,11 @@ apicinterrupt LOCAL_TIMER_VECTOR \ 
apicinterrupt X86_PLATFORM_IPI_VECTOR \

	x86_platform_ipi smp_x86_platform_ipi



#ifdef CONFIG_HAVE_KVM

apicinterrupt POSTED_INTR_VECTOR \

	kvm_posted_intr_ipi smp_kvm_posted_intr_ipi

#endif



apicinterrupt THRESHOLD_APIC_VECTOR \

	threshold_interrupt smp_threshold_interrupt

apicinterrupt THERMAL_APIC_VECTOR \