KVM: PPC: Book3S PR: Fix contents of SRR1 when injecting a program exception

vcpu->arch.shadow_srr1 only contains usable values for injecting
a program exception into the guest if we entered the function
kvmppc_handle_exit_pr() with exit_nr == BOOK3S_INTERRUPT_PROGRAM.
In other cases, the shadow_srr1 bits are zero. Since we want to
pass an illegal-instruction program check to the guest, set
"flags" to SRR1_PROGILL for these other cases.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

1 files changed, 11 insertions, 1 deletions

diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
index 8e4f64f0b774..a910fef86bba 100644
--- a/arch/powerpc/kvm/book3s_pr.c
+++ b/arch/powerpc/kvm/book3s_pr.c
@@ -1049,7 +1049,17 @@ int kvmppc_handle_exit_pr(struct kvm_run *run, struct kvm_vcpu *vcpu,
                 int emul;
 
 program_interrupt:
-                flags = vcpu->arch.shadow_srr1 & 0x1f0000ull;
+                /*
+                 * shadow_srr1 only contains valid flags if we came here via
+                 * a program exception. The other exceptions (emulation assist,
+                 * FP unavailable, etc.) do not provide flags in SRR1, so use
+                 * an illegal-instruction exception when injecting a program
+                 * interrupt into the guest.
+                 */
+                if (exit_nr == BOOK3S_INTERRUPT_PROGRAM)
+                        flags = vcpu->arch.shadow_srr1 & 0x1f0000ull;
+                else
+                        flags = SRR1_PROGILL;
 
                 emul = kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst);
                 if (emul != EMULATE_DONE) {