powerpc: Fix build errors with UP configs in HV-style KVM

This fixes these errors when building UP with CONFIG_KVM_BOOK3S_64_HV=y:

arch/powerpc/kvm/book3s_hv.c:1855:2: error: implicit declaration of function 'inhibit_secondary_onlining' [-Werror=implicit-function-declaration]
arch/powerpc/kvm/book3s_hv.c:1862:2: error: implicit declaration of function 'uninhibit_secondary_onlining' [-Werror=implicit-function-declaration]
cc1: all warnings being treated as errors

and this error (with CONFIG_KVM_BOOK3S_64=m, or a vmlinux link error
with CONFIG_KVM_BOOK3S_64=y):

ERROR: "smp_send_reschedule" [arch/powerpc/kvm/kvm.ko] undefined!
make[2]: *** [__modpost] Error 1

The fix for the link error is suboptimal; ideally we want a self_ipi()
function from irq.c, connected at least to the MPIC code, to initiate
an IPI to this cpu.  The fix here at least lets the code build, and it
will work, just with interrupts being delayed sometimes.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/powerpc/kvm/book3s_hv_interrupts.S b/arch/powerpc/kvm/book3s_hv_interrupts.S
index 84035a528c80..37f1cc417ca0 100644
--- a/arch/powerpc/kvm/book3s_hv_interrupts.S
+++ b/arch/powerpc/kvm/book3s_hv_interrupts.S
@@ -122,11 +122,16 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201)
         add     r8,r8,r7
         std     r8,HSTATE_DECEXP(r13)
 
+#ifdef CONFIG_SMP
         /*
          * On PPC970, if the guest vcpu has an external interrupt pending,
          * send ourselves an IPI so as to interrupt the guest once it
          * enables interrupts.  (It must have interrupts disabled,
          * otherwise we would already have delivered the interrupt.)
+         *
+         * XXX If this is a UP build, smp_send_reschedule is not available,
+         * so the interrupt will be delayed until the next time the vcpu
+         * enters the guest with interrupts enabled.
          */
 BEGIN_FTR_SECTION
         ld      r0, VCPU_PENDING_EXC(r4)
@@ -141,6 +146,7 @@ BEGIN_FTR_SECTION
         mr      r4, r31
 32:
 END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201)
+#endif /* CONFIG_SMP */
 
         /* Jump to partition switch code */
         bl      .kvmppc_hv_entry_trampoline