From 23aca2a7f7e862b0ab5224f3cedc737d2be3bf88 Mon Sep 17 00:00:00 2001
From: Michael Neuling <mikey@neuling.org>
Date: Tue, 27 Mar 2018 15:37:20 +1100
Subject: [PATCH 4/9] KVM: PPC: Book3S HV: Return error from
 h_set_mode(SET_DAWR) on POWER9

References: bsc#1061840
Patch-mainline: v4.17-rc1
Git-commit: 398e712c007fbd0bf996d25eb6b39d8314c50db4

Return H_P2 on a h_set_mode(SET_DAWR) on POWER9 where the DAWR is
disabled.

Current Linux guests ignore this error, so they will silently not get
the DAWR (sigh). The same error code is being used by POWERVM in this
case.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Michal Suchanek <msuchanek@suse.de>
---
 arch/powerpc/kvm/book3s_hv.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 8c5286cc7490..4effe50058f7 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -740,6 +740,8 @@ static int kvmppc_h_set_mode(struct kvm_vcpu *vcpu, unsigned long mflags,
 	case H_SET_MODE_RESOURCE_SET_DAWR:
 		if (!kvmppc_power8_compatible(vcpu))
 			return H_P2;
+		if (!ppc_breakpoint_available())
+			return H_P2;
 		if (mflags)
 			return H_UNSUPPORTED_FLAG_START;
 		if (value2 & DABRX_HYP)
-- 
2.13.6