Implement the MIPS EXIT_VM hypercall used by paravirtual guest kernels.
When the guest performs this hypercall, the request is passed to
userland in the form of a KVM_EXIT_SYSTEM_EVENT exit reason with system
event type KVM_SYSTEM_EVENT_SHUTDOWN.
We also document the hypercall along with the others as the
documentation was never added.
Signed-off-by: James Hogan <james.ho...@imgtec.com>
Cc: Paolo Bonzini <pbonz...@redhat.com>
Cc: "Radim Krčmář" <rkrc...@redhat.com>
Cc: Ralf Baechle <r...@linux-mips.org>
Cc: Andreas Herrmann <andreas.herrm...@caviumnetworks.com>
Cc: David Daney <david.da...@cavium.com>
Cc: Jonathan Corbet <cor...@lwn.net>
Cc: linux-m...@linux-mips.org
Cc: k...@vger.kernel.org
Cc: linux-doc@vger.kernel.org
---
Documentation/virtual/kvm/hypercalls.txt | 6 ++++++
arch/mips/kvm/hypcall.c | 9 +++++++++
2 files changed, 15 insertions(+), 0 deletions(-)
diff --git a/Documentation/virtual/kvm/hypercalls.txt
b/Documentation/virtual/kvm/hypercalls.txt
index e9f1c9d3da98..f8108c84c46b 100644
--- a/Documentation/virtual/kvm/hypercalls.txt
+++ b/Documentation/virtual/kvm/hypercalls.txt
@@ -92,3 +92,9 @@ is used in the hypercall for future use.
Architecture: mips
Status: active
Purpose: Return the frequency of CP0_Count in HZ.
+
+7. KVM_HC_MIPS_EXIT_VM
+------------------------
+Architecture: mips
+Status: active
+Purpose: Shut down the virtual machine.
diff --git a/arch/mips/kvm/hypcall.c b/arch/mips/kvm/hypcall.c
index 7c74ec25f2b9..c3345e5eec02 100644
--- a/arch/mips/kvm/hypcall.c
+++ b/arch/mips/kvm/hypcall.c
@@ -40,6 +40,15 @@ static int kvm_mips_hypercall(struct kvm_vcpu *vcpu,
unsigned long num,
*hret = (s32)vcpu->arch.count_hz;
break;
+ case KVM_HC_MIPS_EXIT_VM:
+ /* Pass shutdown system event to userland */
+ memset(&vcpu->run->system_event, 0,
+ sizeof(vcpu->run->system_event));
+ vcpu->run->system_event.type = KVM_SYSTEM_EVENT_SHUTDOWN;
+ vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
+ ret = RESUME_HOST;
+ break;
+
default:
/* Report unimplemented hypercall to guest */
*hret = -KVM_ENOSYS;
--
git-series 0.8.10
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