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KVM: PPC: Check privilege level on SPRs

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We have 3 privilege levels: problem state, supervisor state and hypervisor
state. Each of them can access different SPRs, so we need to check on every
SPR if it's accessible in the respective mode.

Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexander Graf 2011-08-08 16:07:16 +02:00 committed by Avi Kivity
parent 9432ba6015
commit 317a8fa304
1 changed files with 25 additions and 0 deletions
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25
arch/powerpc/kvm/book3s_emulate.c
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@ -63,6 +63,25 @@
* function pointers, so let's just disable the define. */
#undef mfsrin
enum priv_level {
PRIV_PROBLEM = 0,
PRIV_SUPER = 1,
PRIV_HYPER = 2,
};
static bool spr_allowed(struct kvm_vcpu *vcpu, enum priv_level level)
{
/* PAPR VMs only access supervisor SPRs */
if (vcpu->arch.papr_enabled && (level > PRIV_SUPER))
return false;
/* Limit user space to its own small SPR set */
if ((vcpu->arch.shared->msr & MSR_PR) && level > PRIV_PROBLEM)
return false;
return true;
}
int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
unsigned int inst, int *advance)
{
@ -296,6 +315,8 @@ int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs)
switch (sprn) {
case SPRN_SDR1:
if (!spr_allowed(vcpu, PRIV_HYPER))
goto unprivileged;
to_book3s(vcpu)->sdr1 = spr_val;
break;
case SPRN_DSISR:
@ -390,6 +411,7 @@ int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs)
case SPRN_PMC4_GEKKO:
case SPRN_WPAR_GEKKO:
break;
unprivileged:
default:
printk(KERN_INFO "KVM: invalid SPR write: %d\n", sprn);
#ifndef DEBUG_SPR
@ -421,6 +443,8 @@ int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt)
break;
}
case SPRN_SDR1:
if (!spr_allowed(vcpu, PRIV_HYPER))
goto unprivileged;
kvmppc_set_gpr(vcpu, rt, to_book3s(vcpu)->sdr1);
break;
case SPRN_DSISR:
@ -476,6 +500,7 @@ int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt)
kvmppc_set_gpr(vcpu, rt, 0);
break;
default:
unprivileged:
printk(KERN_INFO "KVM: invalid SPR read: %d\n", sprn);
#ifndef DEBUG_SPR
emulated = EMULATE_FAIL;