diff options
| author | Suresh E. Warrier <warrier@linux.vnet.ibm.com> | 2015-12-21 23:33:57 +0100 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2016-02-29 06:25:06 +0100 |
| commit | 520fe9c607d3acea96391aad27e17518bd7d39bd (patch) | |
| tree | ee3c420760c8d739bfe2cfa9d928c40622545c69 /arch/powerpc/include/asm/kvm_ppc.h | |
| parent | KVM: PPC: Book3S HV: Send IPI to host core to wake VCPU (diff) | |
| download | linux-520fe9c607d3acea96391aad27e17518bd7d39bd.tar.xz linux-520fe9c607d3acea96391aad27e17518bd7d39bd.zip | |
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/include/asm/kvm_ppc.h')
| -rw-r--r-- | arch/powerpc/include/asm/kvm_ppc.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h index bc14e9e0e4fe..197a8aca2871 100644 --- a/arch/powerpc/include/asm/kvm_ppc.h +++ b/arch/powerpc/include/asm/kvm_ppc.h @@ -464,6 +464,7 @@ extern int kvmppc_xics_set_icp(struct kvm_vcpu *vcpu, u64 icpval); extern int kvmppc_xics_connect_vcpu(struct kvm_device *dev, struct kvm_vcpu *vcpu, u32 cpu); extern void kvmppc_xics_ipi_action(void); +extern int h_ipi_redirect; #else static inline void kvmppc_alloc_host_rm_ops(void) {}; static inline void kvmppc_free_host_rm_ops(void) {}; |