diff options
| author | Hollis Blanchard <hollisb@us.ibm.com> | 2008-04-25 17:55:49 -0500 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2008-05-04 14:44:44 +0300 |
| commit | 45c5eb67da5a668abe79c23a7e64dbc87a600f90 (patch) | |
| tree | b2b9ff85ecb5b35d246d68da94b20cb9f9912bff /include | |
| parent | 3fe913e7c550a869e250d04c34410f7a6e263f7c (diff) | |
| download | linux-45c5eb67da5a668abe79c23a7e64dbc87a600f90.tar.gz linux-45c5eb67da5a668abe79c23a7e64dbc87a600f90.tar.bz2 linux-45c5eb67da5a668abe79c23a7e64dbc87a600f90.zip | |
KVM: ppc: Handle guest idle by emulating MSR[WE] writes
This reduces host CPU usage when the guest is idle. However, the guest must
set MSR[WE] in its idle loop, which Linux did not do until 2.6.26.
Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
Signed-off-by: Jerone Young <jyoung5@us.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-powerpc/kvm_host.h | 1 | ||||
| -rw-r--r-- | include/asm-powerpc/kvm_ppc.h | 5 |
2 files changed, 6 insertions, 0 deletions
diff --git a/include/asm-powerpc/kvm_host.h b/include/asm-powerpc/kvm_host.h index 04ffbb8e0a35..81a69d711017 100644 --- a/include/asm-powerpc/kvm_host.h +++ b/include/asm-powerpc/kvm_host.h @@ -59,6 +59,7 @@ struct kvm_vcpu_stat { u32 emulated_inst_exits; u32 dec_exits; u32 ext_intr_exits; + u32 halt_wakeup; }; struct tlbe { diff --git a/include/asm-powerpc/kvm_ppc.h b/include/asm-powerpc/kvm_ppc.h index 7ac820308a7e..b35a7e3ef978 100644 --- a/include/asm-powerpc/kvm_ppc.h +++ b/include/asm-powerpc/kvm_ppc.h @@ -77,12 +77,17 @@ static inline void kvmppc_clear_exception(struct kvm_vcpu *vcpu, int exception) clear_bit(priority, &vcpu->arch.pending_exceptions); } +/* Helper function for "full" MSR writes. No need to call this if only EE is + * changing. */ static inline void kvmppc_set_msr(struct kvm_vcpu *vcpu, u32 new_msr) { if ((new_msr & MSR_PR) != (vcpu->arch.msr & MSR_PR)) kvmppc_mmu_priv_switch(vcpu, new_msr & MSR_PR); vcpu->arch.msr = new_msr; + + if (vcpu->arch.msr & MSR_WE) + kvm_vcpu_block(vcpu); } #endif /* __POWERPC_KVM_PPC_H__ */ |