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KVM: PPC: Book3S: Facilities to save/restore XICS presentation ctrler state

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This adds the ability for userspace to save and restore the state
of the XICS interrupt presentation controllers (ICPs) via the
KVM_GET/SET_ONE_REG interface.  Since there is one ICP per vcpu, we
simply define a new 64-bit register in the ONE_REG space for the ICP
state.  The state includes the CPU priority setting, the pending IPI
priority, and the priority and source number of any pending external
interrupt.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Paul Mackerras
2013-04-17 20:32:26 +00:00
committed by Alexander Graf
parent d19bd86204
commit 8b78645c93
5 changed files with 124 additions and 0 deletions
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19
arch/powerpc/kvm/book3s.c
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@@ -535,6 +535,15 @@ int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
&opcode, sizeof(u32));
break;
}
#ifdef CONFIG_KVM_XICS
case KVM_REG_PPC_ICP_STATE:
if (!vcpu->arch.icp) {
r = -ENXIO;
break;
}
val = get_reg_val(reg->id, kvmppc_xics_get_icp(vcpu));
break;
#endif /* CONFIG_KVM_XICS */
default:
r = -EINVAL;
break;
@@ -597,6 +606,16 @@ int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
vcpu->arch.vscr.u[3] = set_reg_val(reg->id, val);
break;
#endif /* CONFIG_ALTIVEC */
#ifdef CONFIG_KVM_XICS
case KVM_REG_PPC_ICP_STATE:
if (!vcpu->arch.icp) {
r = -ENXIO;
break;
}
r = kvmppc_xics_set_icp(vcpu,
set_reg_val(reg->id, val));
break;
#endif /* CONFIG_KVM_XICS */
default:
r = -EINVAL;
break;