commit 4ac334295e4f3b996e9feabe36e79e44bf77a06f
author James Hogan <james.hogan@imgtec.com> Fri Apr 22 10:38:49 2016 +0100
committer Paolo Bonzini <pbonzini@redhat.com> Tue May 10 15:56:52 2016 +0200
tree 028788c32aaec2ad3e192a534a0fa3823047cf8d
parent 556f2a5231bf3ec4ce98d46434920e31787f79d6

MIPS: KVM: Add missing disable FPU hazard barriers

Add the necessary hazard barriers after disabling the FPU in
kvm_lose_fpu(), just to be safe.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/mips/kvm/mips.c

diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index ec3fe09..23b2094 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -1556,8 +1556,10 @@
 
 		/* Disable MSA & FPU */
 		disable_msa();
-		if (vcpu->arch.fpu_inuse & KVM_MIPS_FPU_FPU)
+		if (vcpu->arch.fpu_inuse & KVM_MIPS_FPU_FPU) {
 			clear_c0_status(ST0_CU1 | ST0_FR);
+			disable_fpu_hazard();
+		}
 		vcpu->arch.fpu_inuse &= ~(KVM_MIPS_FPU_FPU | KVM_MIPS_FPU_MSA);
 	} else if (vcpu->arch.fpu_inuse & KVM_MIPS_FPU_FPU) {
 		set_c0_status(ST0_CU1);
@@ -1568,6 +1570,7 @@
 
 		/* Disable FPU */
 		clear_c0_status(ST0_CU1 | ST0_FR);
+		disable_fpu_hazard();
 	}
 	preempt_enable();
 }