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KVM: PPC: Book3S HV: Tunable to disable KVM IRQ bypass

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Add a  module parameter kvm_irq_bypass for kvm_hv.ko to
disable IRQ bypass for passthrough interrupts. The default
value of this tunable is 1 - that is enable the feature.

Since the tunable is used by built-in kernel code, we use
the module_param_cb macro to achieve this.

Signed-off-by: Suresh Warrier <warrier@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Suresh Warrier
2016-08-19 15:35:54 +10:00
committed by Paul Mackerras
parent af893c7dc9
commit 644abbb254
4 changed files with 14 additions and 1 deletions
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2
arch/powerpc/include/asm/kvm_ppc.h
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@@ -461,7 +461,7 @@ static inline int kvmppc_xics_enabled(struct kvm_vcpu *vcpu)
static inline struct kvmppc_passthru_irqmap *kvmppc_get_passthru_irqmap(
struct kvm *kvm)
{
if (kvm)
if (kvm && kvm_irq_bypass)
return kvm->arch.pimap;
return NULL;
}