diff options
| author | Suresh E. Warrier <warrier@linux.vnet.ibm.com> | 2015-12-21 16:33:57 -0600 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2016-02-29 16:25:06 +1100 |
| commit | 520fe9c607d3acea96391aad27e17518bd7d39bd (patch) | |
| tree | ee3c420760c8d739bfe2cfa9d928c40622545c69 /arch/powerpc/kvm/book3s_hv_rm_xics.c | |
| parent | e17769eb8c897101e2c6df62ec397e450b6e53b4 (diff) | |
KVM: PPC: Book3S HV: Add tunable to control H_IPI redirection
Redirecting the wakeup of a VCPU from the H_IPI hypercall to
a core running in the host is usually a good idea, most workloads
seemed to benefit. However, in one heavily interrupt-driven SMT1
workload, some regression was observed. This patch adds a kvm_hv
module parameter called h_ipi_redirect to control this feature.
The default value for this tunable is 1 - that is enable the feature.
Signed-off-by: Suresh Warrier <warrier@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/kvm/book3s_hv_rm_xics.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_hv_rm_xics.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/powerpc/kvm/book3s_hv_rm_xics.c b/arch/powerpc/kvm/book3s_hv_rm_xics.c index e673fb9fee98..980d8a6f7284 100644 --- a/arch/powerpc/kvm/book3s_hv_rm_xics.c +++ b/arch/powerpc/kvm/book3s_hv_rm_xics.c @@ -24,6 +24,9 @@ #define DEBUG_PASSUP +int h_ipi_redirect = 1; +EXPORT_SYMBOL(h_ipi_redirect); + static void icp_rm_deliver_irq(struct kvmppc_xics *xics, struct kvmppc_icp *icp, u32 new_irq); @@ -148,7 +151,7 @@ static void icp_rm_set_vcpu_irq(struct kvm_vcpu *vcpu, cpu = vcpu->arch.thread_cpu; if (cpu < 0 || cpu >= nr_cpu_ids) { hcore = -1; - if (kvmppc_host_rm_ops_hv) + if (kvmppc_host_rm_ops_hv && h_ipi_redirect) hcore = find_available_hostcore(XICS_RM_KICK_VCPU); if (hcore != -1) { icp_send_hcore_msg(hcore, vcpu); |