[PATCH v5 42/48] KVM: PPC: Book3S HV: Radix guests should not have userspace hcalls reflected to them

[Nicholas Piggin]

The reflection of sc 1 hcalls from PR=1 userspace is required to support
PR KVM. Radix guests don't support PR KVM nor do they support nested
hash guests, so this sc 1 reflection can be removed from radix guests.
Cause a privileged program check instead, which is less surprising.

Signed-off-by: Nicholas Piggin <npig...@gmail.com>
---
 arch/powerpc/kvm/book3s_hv.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index ae5ad93a623f..f4d6ec6c4710 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -1403,11 +1403,20 @@ static int kvmppc_handle_exit_hv(struct kvm_vcpu *vcpu,
                int i;
 
                if (unlikely(vcpu->arch.shregs.msr & MSR_PR)) {
-                       /*
-                        * Guest userspace executed sc 1, reflect it back as a
-                        * syscall as it may be a PR KVM hcall.
-                        */
-                       kvmppc_core_queue_syscall(vcpu);
+                       if (!kvmhv_vcpu_is_radix(vcpu)) {
+                               /*
+                                * Guest userspace executed sc 1, reflect it
+                                * back as a syscall as it may be a PR KVM
+                                * hcall.
+                                */
+                               kvmppc_core_queue_syscall(vcpu);
+                       } else {
+                               /*
+                                * radix guests can not run PR KVM so send a
+                                * program check.
+                                */
+                               kvmppc_core_queue_program(vcpu, SRR1_PROGPRIV);
+                       }
                        r = RESUME_GUEST;
                        break;
                }
-- 
2.23.0