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KVM: PPC: Implement Level interrupts on Book3S

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The current interrupt logic is just completely broken. We get a notification
from user space, telling us that an interrupt is there. But then user space
expects us that we just acknowledge an interrupt once we deliver it to the
guest.

This is not how real hardware works though. On real hardware, the interrupt
controller pulls the external interrupt line until it gets notified that the
interrupt was received.

So in reality we have two events: pulling and letting go of the interrupt line.

To maintain backwards compatibility, I added a new request for the pulling
part. The letting go part was implemented earlier already.

With this in place, we can now finally start guests that do not randomly stall
and stop to work at random times.

This patch implements above logic for Book3S.

Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexander Graf 2010-08-30 10:44:15 +02:00 committed by Avi Kivity
parent 591bd8e7b4
commit 17bd158006
3 changed files with 31 additions and 4 deletions
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1
arch/powerpc/include/asm/kvm.h
View File

@ -86,5 +86,6 @@ struct kvm_guest_debug_arch {
#define KVM_INTERRUPT_SET -1U
#define KVM_INTERRUPT_UNSET -2U
#define KVM_INTERRUPT_SET_LEVEL -3U
#endif /* __LINUX_KVM_POWERPC_H */

4
arch/powerpc/include/asm/kvm_asm.h
View File

@ -58,6 +58,7 @@
#define BOOK3S_INTERRUPT_INST_STORAGE 0x400
#define BOOK3S_INTERRUPT_INST_SEGMENT 0x480
#define BOOK3S_INTERRUPT_EXTERNAL 0x500
#define BOOK3S_INTERRUPT_EXTERNAL_LEVEL 0x501
#define BOOK3S_INTERRUPT_ALIGNMENT 0x600
#define BOOK3S_INTERRUPT_PROGRAM 0x700
#define BOOK3S_INTERRUPT_FP_UNAVAIL 0x800
@ -84,7 +85,8 @@
#define BOOK3S_IRQPRIO_EXTERNAL 13
#define BOOK3S_IRQPRIO_DECREMENTER 14
#define BOOK3S_IRQPRIO_PERFORMANCE_MONITOR 15
#define BOOK3S_IRQPRIO_MAX 16
#define BOOK3S_IRQPRIO_EXTERNAL_LEVEL 16
#define BOOK3S_IRQPRIO_MAX 17
#define BOOK3S_HFLAG_DCBZ32 0x1
#define BOOK3S_HFLAG_SLB 0x2

30
arch/powerpc/kvm/book3s.c
View File

@ -186,6 +186,7 @@ static int kvmppc_book3s_vec2irqprio(unsigned int vec)
case 0x400: prio = BOOK3S_IRQPRIO_INST_STORAGE; break;
case 0x480: prio = BOOK3S_IRQPRIO_INST_SEGMENT; break;
case 0x500: prio = BOOK3S_IRQPRIO_EXTERNAL; break;
case 0x501: prio = BOOK3S_IRQPRIO_EXTERNAL_LEVEL; break;
case 0x600: prio = BOOK3S_IRQPRIO_ALIGNMENT; break;
case 0x700: prio = BOOK3S_IRQPRIO_PROGRAM; break;
case 0x800: prio = BOOK3S_IRQPRIO_FP_UNAVAIL; break;
@ -246,13 +247,19 @@ void kvmppc_core_dequeue_dec(struct kvm_vcpu *vcpu)
void kvmppc_core_queue_external(struct kvm_vcpu *vcpu,
struct kvm_interrupt *irq)
{
kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_EXTERNAL);
unsigned int vec = BOOK3S_INTERRUPT_EXTERNAL;
if (irq->irq == KVM_INTERRUPT_SET_LEVEL)
vec = BOOK3S_INTERRUPT_EXTERNAL_LEVEL;
kvmppc_book3s_queue_irqprio(vcpu, vec);
}
void kvmppc_core_dequeue_external(struct kvm_vcpu *vcpu,
struct kvm_interrupt *irq)
{
kvmppc_book3s_dequeue_irqprio(vcpu, BOOK3S_INTERRUPT_EXTERNAL);
kvmppc_book3s_dequeue_irqprio(vcpu, BOOK3S_INTERRUPT_EXTERNAL_LEVEL);
}
int kvmppc_book3s_irqprio_deliver(struct kvm_vcpu *vcpu, unsigned int priority)
@ -281,6 +288,7 @@ int kvmppc_book3s_irqprio_deliver(struct kvm_vcpu *vcpu, unsigned int priority)
vec = BOOK3S_INTERRUPT_DECREMENTER;
break;
case BOOK3S_IRQPRIO_EXTERNAL:
case BOOK3S_IRQPRIO_EXTERNAL_LEVEL:
deliver = (vcpu->arch.shared->msr & MSR_EE) && !crit;
vec = BOOK3S_INTERRUPT_EXTERNAL;
break;
@ -343,6 +351,23 @@ int kvmppc_book3s_irqprio_deliver(struct kvm_vcpu *vcpu, unsigned int priority)
return deliver;
}
/*
* This function determines if an irqprio should be cleared once issued.
*/
static bool clear_irqprio(struct kvm_vcpu *vcpu, unsigned int priority)
{
switch (priority) {
case BOOK3S_IRQPRIO_DECREMENTER:
/* DEC interrupts get cleared by mtdec */
return false;
case BOOK3S_IRQPRIO_EXTERNAL_LEVEL:
/* External interrupts get cleared by userspace */
return false;
}
return true;
}
void kvmppc_core_deliver_interrupts(struct kvm_vcpu *vcpu)
{
unsigned long *pending = &vcpu->arch.pending_exceptions;
@ -356,8 +381,7 @@ void kvmppc_core_deliver_interrupts(struct kvm_vcpu *vcpu)
priority = __ffs(*pending);
while (priority < BOOK3S_IRQPRIO_MAX) {
if (kvmppc_book3s_irqprio_deliver(vcpu, priority) &&
(priority != BOOK3S_IRQPRIO_DECREMENTER)) {
/* DEC interrupts get cleared by mtdec */
clear_irqprio(vcpu, priority)) {
clear_bit(priority, &vcpu->arch.pending_exceptions);
break;
}