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KVM: PPC: BOOK3S: PR: Emulate virtual timebase register

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virtual time base register is a per VM, per cpu register that needs
to be saved and restored on vm exit and entry. Writing to VTB is not
allowed in the privileged mode.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
[agraf: fix compile error]
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Aneesh Kumar K.V
2014-06-05 17:38:02 +05:30
committed by Alexander Graf
parent 3cd60e3118
commit 8f42ab2749
7 changed files with 30 additions and 7 deletions
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3
arch/powerpc/kvm/book3s_pr.c
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@@ -125,6 +125,7 @@ void kvmppc_copy_to_svcpu(struct kvmppc_book3s_shadow_vcpu *svcpu,
* to find the guest purr and spurr value.
*/
vcpu->arch.entry_tb = get_tb();
vcpu->arch.entry_vtb = get_vtb();
svcpu->in_use = true;
}
@@ -176,7 +177,7 @@ void kvmppc_copy_from_svcpu(struct kvm_vcpu *vcpu,
*/
vcpu->arch.purr += get_tb() - vcpu->arch.entry_tb;
vcpu->arch.spurr += get_tb() - vcpu->arch.entry_tb;
vcpu->arch.vtb += get_vtb() - vcpu->arch.entry_vtb;
svcpu->in_use = false;
out: