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| author | Suresh Warrier <warrier@linux.vnet.ibm.com> | 2016-08-19 15:35:54 +1000 |
|---|---|---|
| committer | Paul Mackerras <paulus@ozlabs.org> | 2016-09-12 10:12:18 +1000 |
| commit | 644abbb254b1ab171f777431b23e6fb5879599d0 (patch) | |
| tree | a0a086f8d767d6ada28b095612e3a50a3eed6555 /arch/powerpc/kvm/book3s_hv.c | |
| parent | af893c7dc941f2510d4f23e76e312c77c434b2f0 (diff) | |
| download | blackbird-obmc-linux-644abbb254b1ab171f777431b23e6fb5879599d0.tar.gz blackbird-obmc-linux-644abbb254b1ab171f777431b23e6fb5879599d0.zip | |
KVM: PPC: Book3S HV: Tunable to disable KVM IRQ bypass
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>
Diffstat (limited to 'arch/powerpc/kvm/book3s_hv.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_hv.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 90beb96a0df6..03721ed63131 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -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; |
