5 files changed, 36 insertions, 3 deletions

diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index a393c2b6b1b6..90beb96a0df6 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -74,6 +74,8 @@
 
 /* Used to indicate that a guest page fault needs to be handled */
 #define RESUME_PAGE_FAULT	(RESUME_GUEST | RESUME_FLAG_ARCH1)
+/* Used to indicate that a guest passthrough interrupt needs to be handled */
+#define RESUME_PASSTHROUGH	(RESUME_GUEST | RESUME_FLAG_ARCH2)
 
 /* Used as a "null" value for timebase values */
 #define TB_NIL	(~(u64)0)
@@ -1032,6 +1034,9 @@ static int kvmppc_handle_exit_hv(struct kvm_run *run, struct kvm_vcpu *vcpu,
 		kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
 		r = RESUME_GUEST;
 		break;
+	case BOOK3S_INTERRUPT_HV_RM_HARD:
+		r = RESUME_PASSTHROUGH;
+		break;
 	default:
 		kvmppc_dump_regs(vcpu);
 		printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n",
@@ -2951,7 +2956,8 @@ static int kvmppc_vcpu_run_hv(struct kvm_run *run, struct kvm_vcpu *vcpu)
 			r = kvmppc_book3s_hv_page_fault(run, vcpu,
 				vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
 			srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
-		}
+		} else if (r == RESUME_PASSTHROUGH)
+			r = kvmppc_xics_rm_complete(vcpu, 0);
 	} while (is_kvmppc_resume_guest(r));
 
  out:
diff --git a/arch/powerpc/kvm/book3s_hv_builtin.c b/arch/powerpc/kvm/book3s_hv_builtin.c
index 7531e29f90bd..0c84d6bc8356 100644
--- a/arch/powerpc/kvm/book3s_hv_builtin.c
+++ b/arch/powerpc/kvm/book3s_hv_builtin.c
@@ -363,6 +363,7 @@ static inline int kvmppc_check_passthru(u32 xisr, __be32 xirr)
  * Returns:
  *	0 if no interrupt is pending
  *	1 if an interrupt is pending that needs to be handled by the host
+ *	2 Passthrough that needs completion in the host
  *	-1 if there was a guest wakeup IPI (which has now been cleared)
  *	-2 if there is PCI passthrough external interrupt that was handled
  */
diff --git a/arch/powerpc/kvm/book3s_hv_rm_xics.c b/arch/powerpc/kvm/book3s_hv_rm_xics.c
index 17f5b851db8c..3b8d7ac0be7c 100644
--- a/arch/powerpc/kvm/book3s_hv_rm_xics.c
+++ b/arch/powerpc/kvm/book3s_hv_rm_xics.c
@@ -751,7 +751,7 @@ long kvmppc_deliver_irq_passthru(struct kvm_vcpu *vcpu,
 	icp_eoi(irq_desc_get_chip(irq_map->desc), irq_map->r_hwirq, xirr);
 
 	if (check_too_hard(xics, icp) == H_TOO_HARD)
-		return 1;
+		return 2;
 	else
 		return -2;
 }
diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
index 12fb2afb23fc..7cc924b5eea2 100644
--- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S
+++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
@@ -1189,6 +1189,11 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
 	 *   1 An interrupt is pending that needs to be handled by the host
 	 *     Exit guest and return to host by branching to guest_exit_cont
 	 *
+	 *   2 Passthrough that needs completion in the host
+	 *     Exit guest and return to host by branching to guest_exit_cont
+	 *     However, we also set r12 to BOOK3S_INTERRUPT_HV_RM_HARD
+	 *     to indicate to the host to complete handling the interrupt
+	 *
 	 * Before returning to guest, we check if any CPU is heading out
 	 * to the host and if so, we head out also. If no CPUs are heading
 	 * check return values <= 0.
@@ -1204,6 +1209,15 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
 	 *    Return to guest to deliver any pending guest interrupts.
 	 */
 
+	cmpdi	r3, 1
+	ble	1f
+
+	/* Return code = 2 */
+	li	r12, BOOK3S_INTERRUPT_HV_RM_HARD
+	stw	r12, VCPU_TRAP(r9)
+	b	guest_exit_cont
+
+1:	/* Return code <= 1 */
 	cmpdi	r3, 0
 	bgt	guest_exit_cont
 
@@ -2419,6 +2433,17 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
 	bl	kvmppc_read_intr
 	nop
 	li	r12, BOOK3S_INTERRUPT_EXTERNAL
+	cmpdi	r3, 1
+	ble	1f
+
+	/*
+	 * Return code of 2 means PCI passthrough interrupt, but
+	 * we need to return back to host to complete handling the
+	 * interrupt. Trap reason is expected in r12 by guest
+	 * exit code.
+	 */
+	li	r12, BOOK3S_INTERRUPT_HV_RM_HARD
+1:
 	ld	r0, PPC_MIN_STKFRM+PPC_LR_STKOFF(r1)
 	addi	r1, r1, PPC_MIN_STKFRM
 	mtlr	r0
diff --git a/arch/powerpc/kvm/book3s_xics.c b/arch/powerpc/kvm/book3s_xics.c
index 686147efbac5..4edbe7b93eb5 100644
--- a/arch/powerpc/kvm/book3s_xics.c
+++ b/arch/powerpc/kvm/book3s_xics.c
@@ -812,7 +812,7 @@ static noinline int kvmppc_h_eoi(struct kvm_vcpu *vcpu, unsigned long xirr)
 	return H_SUCCESS;
 }
 
-static noinline int kvmppc_xics_rm_complete(struct kvm_vcpu *vcpu, u32 hcall)
+int kvmppc_xics_rm_complete(struct kvm_vcpu *vcpu, u32 hcall)
 {
 	struct kvmppc_xics *xics = vcpu->kvm->arch.xics;
 	struct kvmppc_icp *icp = vcpu->arch.icp;
@@ -841,6 +841,7 @@ static noinline int kvmppc_xics_rm_complete(struct kvm_vcpu *vcpu, u32 hcall)
 
 	return H_SUCCESS;
 }
+EXPORT_SYMBOL_GPL(kvmppc_xics_rm_complete);
 
 int kvmppc_xics_hcall(struct kvm_vcpu *vcpu, u32 req)
 {