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| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2014-06-04 16:47:55 +0530 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2014-07-06 13:56:49 +0200 |
| commit | 3cd60e31185343d4132ca7cf3c9becb903b3ec1b (patch) | |
| tree | 0098c9324ef89484f063845b18153385357d8bfd /arch/powerpc/kvm/book3s_pr.c | |
| parent | 9f6226a762c7ae02f6a23a3d4fc552dafa57ea23 (diff) | |
| download | lwn-3cd60e31185343d4132ca7cf3c9becb903b3ec1b.tar.gz lwn-3cd60e31185343d4132ca7cf3c9becb903b3ec1b.zip | |
KVM: PPC: BOOK3S: PR: Fix PURR and SPURR emulation
We use time base for PURR and SPURR emulation with PR KVM since we
are emulating a single threaded core. When using time base
we need to make sure that we don't accumulate time spent in the host
in PURR and SPURR value.
Also we don't need to emulate mtspr because both the registers are
hypervisor resource.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc/kvm/book3s_pr.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_pr.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c index 8eef1e519077..671f5c92a54d 100644 --- a/arch/powerpc/kvm/book3s_pr.c +++ b/arch/powerpc/kvm/book3s_pr.c @@ -120,6 +120,11 @@ void kvmppc_copy_to_svcpu(struct kvmppc_book3s_shadow_vcpu *svcpu, #ifdef CONFIG_PPC_BOOK3S_64 svcpu->shadow_fscr = vcpu->arch.shadow_fscr; #endif + /* + * Now also save the current time base value. We use this + * to find the guest purr and spurr value. + */ + vcpu->arch.entry_tb = get_tb(); svcpu->in_use = true; } @@ -166,6 +171,12 @@ void kvmppc_copy_from_svcpu(struct kvm_vcpu *vcpu, #ifdef CONFIG_PPC_BOOK3S_64 vcpu->arch.shadow_fscr = svcpu->shadow_fscr; #endif + /* + * Update purr and spurr using time base on exit. + */ + vcpu->arch.purr += get_tb() - vcpu->arch.entry_tb; + vcpu->arch.spurr += get_tb() - vcpu->arch.entry_tb; + svcpu->in_use = false; out: |