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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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10
arch/powerpc/kvm/book3s_hv.c
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@@ -95,6 +95,10 @@ static struct kernel_param_ops module_param_ops = {
.get = param_get_int,
};
module_param_cb(kvm_irq_bypass, &module_param_ops, &kvm_irq_bypass,
S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(kvm_irq_bypass, "Bypass passthrough interrupt optimization");
module_param_cb(h_ipi_redirect, &module_param_ops, &h_ipi_redirect,
S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(h_ipi_redirect, "Redirect H_IPI wakeup to a free host core");
@@ -3443,6 +3447,9 @@ static int kvmppc_set_passthru_irq(struct kvm *kvm, int host_irq, int guest_gsi)
struct irq_chip *chip;
int i;
if (!kvm_irq_bypass)
return 1;
desc = irq_to_desc(host_irq);
if (!desc)
return -EIO;
@@ -3519,6 +3526,9 @@ static int kvmppc_clr_passthru_irq(struct kvm *kvm, int host_irq, int guest_gsi)
struct kvmppc_passthru_irqmap *pimap;
int i;
if (!kvm_irq_bypass)
return 0;
desc = irq_to_desc(host_irq);
if (!desc)
return -EIO;