KVM: PPC: Add sanity checking to vcpu_run

There are multiple features in PowerPC KVM that can now be enabled
depending on the user's wishes. Some of the combinations don't make
sense or don't work though.

So this patch adds a way to check if the executing environment would
actually be able to run the guest properly. It also adds sanity
checks if PVR is set (should always be true given the current code
flow), if PAPR is only used with book3s_64 where it works and that
HV KVM is only used in PAPR mode.

Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 9 insertions, 1 deletions

diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index ee45fa01220e..bb6c988f010a 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -316,6 +316,11 @@ int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
 {
         int ret;
 
+        if (!vcpu->arch.sane) {
+                kvm_run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+                return -EINVAL;
+        }
+
         local_irq_disable();
         kvm_guest_enter();
         ret = __kvmppc_vcpu_run(kvm_run, vcpu);
@@ -618,6 +623,7 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
 {
         int i;
+        int r;
 
         vcpu->arch.pc = 0;
         vcpu->arch.shared->msr = 0;
@@ -634,7 +640,9 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
 
         kvmppc_init_timing_stats(vcpu);
 
-        return kvmppc_core_vcpu_setup(vcpu);
+        r = kvmppc_core_vcpu_setup(vcpu);
+        kvmppc_sanity_check(vcpu);
+        return r;
 }
 
 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)