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authorJames Hogan <james.hogan@imgtec.com>2017-03-14 10:15:14 +0000
committerJames Hogan <james.hogan@imgtec.com>2017-03-28 14:53:33 +0100
commit955d8dc3ee555e9320fabbeab0969f9cf7660f9d (patch)
treeb6a2787a9b99078a7387c90a2f8ddaee63840830 /arch/mips/kvm/trap_emul.c
parenta6c09b9f9d1c3b1daf8e24e5556d73b9303843ef (diff)
KVM: MIPS: Implement HYPCALL emulation
Emulate the HYPCALL instruction added in the VZ ASE and used by the MIPS paravirtualised guest support that is already merged. The new hypcall.c handles arguments and the return value. No actual hypercalls are yet supported, but this still allows us to safely step over hypercalls and set an error code in the return value for forward compatibility. Non-zero HYPCALL codes are not handled. We also document the hypercall ABI which asm/kvm_para.h uses. Signed-off-by: James Hogan <james.hogan@imgtec.com> Acked-by: Ralf Baechle <ralf@linux-mips.org> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Radim Krčmář" <rkrcmar@redhat.com> Cc: Andreas Herrmann <andreas.herrmann@caviumnetworks.com> Cc: David Daney <david.daney@cavium.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org Cc: linux-doc@vger.kernel.org
Diffstat (limited to 'arch/mips/kvm/trap_emul.c')
-rw-r--r--arch/mips/kvm/trap_emul.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/mips/kvm/trap_emul.c b/arch/mips/kvm/trap_emul.c
index b1fa53b252ea..3a854bb9e606 100644
--- a/arch/mips/kvm/trap_emul.c
+++ b/arch/mips/kvm/trap_emul.c
@@ -82,6 +82,10 @@ static int kvm_trap_emul_handle_cop_unusable(struct kvm_vcpu *vcpu)
ret = RESUME_HOST;
break;
+ case EMULATE_HYPERCALL:
+ ret = kvm_mips_handle_hypcall(vcpu);
+ break;
+
default:
BUG();
}