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Subject[PATCH 26/46] KVM: Reduce runnability interface with arch support code
Date
From: Gleb Natapov <gleb@redhat.com>

Remove kvm_cpu_has_interrupt() and kvm_arch_interrupt_allowed() from
interface between general code and arch code. kvm_arch_vcpu_runnable()
checks for interrupts instead.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
---
arch/ia64/kvm/kvm-ia64.c | 16 ++--------------
arch/powerpc/kvm/powerpc.c | 13 +------------
arch/s390/kvm/interrupt.c | 8 +-------
arch/x86/include/asm/kvm_host.h | 2 ++
arch/x86/kvm/x86.c | 6 ++++--
include/linux/kvm_host.h | 2 --
virt/kvm/kvm_main.c | 4 +---
7 files changed, 11 insertions(+), 40 deletions(-)

diff --git a/arch/ia64/kvm/kvm-ia64.c b/arch/ia64/kvm/kvm-ia64.c
index d7aa6bb..0ad09f0 100644
--- a/arch/ia64/kvm/kvm-ia64.c
+++ b/arch/ia64/kvm/kvm-ia64.c
@@ -1935,19 +1935,6 @@ int kvm_highest_pending_irq(struct kvm_vcpu *vcpu)
return find_highest_bits((int *)&vpd->irr[0]);
}

-int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu)
-{
- if (kvm_highest_pending_irq(vcpu) != -1)
- return 1;
- return 0;
-}
-
-int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu)
-{
- /* do real check here */
- return 1;
-}
-
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
{
return vcpu->arch.timer_fired;
@@ -1960,7 +1947,8 @@ gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)

int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
{
- return vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE;
+ return (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE) ||
+ (kvm_highest_pending_irq(vcpu) != -1);
}

int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 0341391..2a4551f 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -39,20 +39,9 @@ gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
return gfn;
}

-int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
-{
- return !!(v->arch.pending_exceptions);
-}
-
-int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu)
-{
- /* do real check here */
- return 1;
-}
-
int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
{
- return !(v->arch.msr & MSR_WE);
+ return !(v->arch.msr & MSR_WE) || !!(v->arch.pending_exceptions);
}


diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index 4d61341..2c2f983 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -283,7 +283,7 @@ static int __try_deliver_ckc_interrupt(struct kvm_vcpu *vcpu)
return 1;
}

-int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu)
+static int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu)
{
struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
@@ -320,12 +320,6 @@ int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu)
return rc;
}

-int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu)
-{
- /* do real check here */
- return 1;
-}
-
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
{
return 0;
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 3f4f00a..08732d7 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -797,6 +797,8 @@ asmlinkage void kvm_handle_fault_on_reboot(void);
int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
int kvm_age_hva(struct kvm *kvm, unsigned long hva);
int cpuid_maxphyaddr(struct kvm_vcpu *vcpu);
+int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu);
+int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu);
int kvm_cpu_get_interrupt(struct kvm_vcpu *v);

#endif /* _ASM_X86_KVM_HOST_H */
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index d2e1ffb..48567fa 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4886,8 +4886,10 @@ void kvm_arch_flush_shadow(struct kvm *kvm)
int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
{
return vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE
- || vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED
- || vcpu->arch.nmi_pending;
+ || vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED
+ || vcpu->arch.nmi_pending ||
+ (kvm_arch_interrupt_allowed(vcpu) &&
+ kvm_cpu_has_interrupt(vcpu));
}

void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 2c6a5f0..4af5603 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -332,7 +332,6 @@ int kvm_arch_hardware_setup(void);
void kvm_arch_hardware_unsetup(void);
void kvm_arch_check_processor_compat(void *rtn);
int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);
-int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu);

void kvm_free_physmem(struct kvm *kvm);

@@ -341,7 +340,6 @@ void kvm_arch_destroy_vm(struct kvm *kvm);
void kvm_free_all_assigned_devices(struct kvm *kvm);
void kvm_arch_sync_events(struct kvm *kvm);

-int kvm_cpu_has_interrupt(struct kvm_vcpu *v);
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu);
void kvm_vcpu_kick(struct kvm_vcpu *vcpu);

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index d7b9bbb..532af9b 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1666,9 +1666,7 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
for (;;) {
prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);

- if ((kvm_arch_interrupt_allowed(vcpu) &&
- kvm_cpu_has_interrupt(vcpu)) ||
- kvm_arch_vcpu_runnable(vcpu)) {
+ if (kvm_arch_vcpu_runnable(vcpu)) {
set_bit(KVM_REQ_UNHALT, &vcpu->requests);
break;
}
--
1.6.4.1


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