The function kvmppc_handle_exit_pr() is quite huge and thus hard to read,
and even contains a "spaghetti-code"-like goto between the different case
labels of the big switch statement. This can be made much more readable
by moving the code related to injecting program interrupts / instruction
emulation into a separate function instead.
Signed-off-by: Thomas Huth <th...@redhat.com>
---
arch/powerpc/kvm/book3s_pr.c | 130 +++++++++++++++++++++----------------------
1 file changed, 65 insertions(+), 65 deletions(-)
diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
index 1482961..d4dfc0c 100644
--- a/arch/powerpc/kvm/book3s_pr.c
+++ b/arch/powerpc/kvm/book3s_pr.c
@@ -902,6 +902,69 @@ static void kvmppc_clear_debug(struct kvm_vcpu *vcpu)
}
}
+static int kvmppc_exit_pr_progint(struct kvm_run *run, struct kvm_vcpu *vcpu,
+ unsigned int exit_nr)
+{
+ enum emulation_result er;
+ ulong flags;
+ u32 last_inst;
+ int emul, r;
+
+ /*
+ * 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)
+ return RESUME_GUEST;
+
+ if (kvmppc_get_msr(vcpu) & MSR_PR) {
+#ifdef EXIT_DEBUG
+ pr_info("Userspace triggered 0x700 exception at\n 0x%lx
(0x%x)\n",
+ kvmppc_get_pc(vcpu), last_inst);
+#endif
+ if ((last_inst & 0xff0007ff) != (INS_DCBZ & 0xfffffff7)) {
+ kvmppc_core_queue_program(vcpu, flags);
+ return RESUME_GUEST;
+ }
+ }
+
+ vcpu->stat.emulated_inst_exits++;
+ er = kvmppc_emulate_instruction(run, vcpu);
+ switch (er) {
+ case EMULATE_DONE:
+ r = RESUME_GUEST_NV;
+ break;
+ case EMULATE_AGAIN:
+ r = RESUME_GUEST;
+ break;
+ case EMULATE_FAIL:
+ pr_crit("%s: emulation at %lx failed (%08x)\n",
+ __func__, kvmppc_get_pc(vcpu), last_inst);
+ kvmppc_core_queue_program(vcpu, flags);
+ r = RESUME_GUEST;
+ break;
+ case EMULATE_DO_MMIO:
+ run->exit_reason = KVM_EXIT_MMIO;
+ r = RESUME_HOST_NV;
+ break;
+ case EMULATE_EXIT_USER:
+ r = RESUME_HOST_NV;
+ break;
+ default:
+ BUG();
+ }
+
+ return r;
+}
+
int kvmppc_handle_exit_pr(struct kvm_run *run, struct kvm_vcpu *vcpu,
unsigned int exit_nr)
{
@@ -1044,71 +1107,8 @@ int kvmppc_handle_exit_pr(struct kvm_run *run, struct
kvm_vcpu *vcpu,
break;
case BOOK3S_INTERRUPT_PROGRAM:
case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
- {
- enum emulation_result er;
- ulong flags;
- u32 last_inst;
- int emul;
-
-program_interrupt:
- /*
- * 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) {
- r = RESUME_GUEST;
- break;
- }
-
- if (kvmppc_get_msr(vcpu) & MSR_PR) {
-#ifdef EXIT_DEBUG
- pr_info("Userspace triggered 0x700 exception at\n 0x%lx
(0x%x)\n",
- kvmppc_get_pc(vcpu), last_inst);
-#endif
- if ((last_inst & 0xff0007ff) !=
- (INS_DCBZ & 0xfffffff7)) {
- kvmppc_core_queue_program(vcpu, flags);
- r = RESUME_GUEST;
- break;
- }
- }
-
- vcpu->stat.emulated_inst_exits++;
- er = kvmppc_emulate_instruction(run, vcpu);
- switch (er) {
- case EMULATE_DONE:
- r = RESUME_GUEST_NV;
- break;
- case EMULATE_AGAIN:
- r = RESUME_GUEST;
- break;
- case EMULATE_FAIL:
- printk(KERN_CRIT "%s: emulation at %lx failed (%08x)\n",
- __func__, kvmppc_get_pc(vcpu), last_inst);
- kvmppc_core_queue_program(vcpu, flags);
- r = RESUME_GUEST;
- break;
- case EMULATE_DO_MMIO:
- run->exit_reason = KVM_EXIT_MMIO;
- r = RESUME_HOST_NV;
- break;
- case EMULATE_EXIT_USER:
- r = RESUME_HOST_NV;
- break;
- default:
- BUG();
- }
+ r = kvmppc_exit_pr_progint(run, vcpu, exit_nr);
break;
- }
case BOOK3S_INTERRUPT_SYSCALL:
{
u32 last_sc;
@@ -1185,7 +1185,7 @@ int kvmppc_handle_exit_pr(struct kvm_run *run, struct
kvm_vcpu *vcpu,
emul = kvmppc_get_last_inst(vcpu, INST_GENERIC,
&last_inst);
if (emul == EMULATE_DONE)
- goto program_interrupt;
+ r = kvmppc_exit_pr_progint(run, vcpu, exit_nr);
else
r = RESUME_GUEST;
--
1.8.3.1
