From 398e712c007fbd0bf996d25eb6b39d8314c50db4 Mon Sep 17 00:00:00 2001 From: Michael Neuling Date: Tue, 27 Mar 2018 15:37:20 +1100 Subject: [PATCH] KVM: PPC: Book3S HV: Return error from h_set_mode(SET_DAWR) on POWER9 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 Signed-off-by: Michael Ellerman --- 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 a043bde4952c..55c1022733c3 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -741,6 +741,8 @@ 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) -- 2.30.2