Add new capability for event channel support in hypervisor.
Signed-off-by: Joao Martins <joao.m.martins@xxxxxxxxxx>
---
Documentation/virtual/kvm/api.txt | 9 +++++++++
arch/x86/kvm/x86.c | 1 +
include/uapi/linux/kvm.h | 3 +++
3 files changed, 13 insertions(+)
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index c3a1402b76bf..36d9386415fa 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -5037,3 +5037,12 @@ Architectures: x86
This capability indicates that KVM supports Xen HVM guests.
This includes KVM_IRQ_ROUTING_XEN_EVTCHN as well.
+
+8.23 KVM_CAP_XEN_HVM_EVTCHN
+
+Architectures: x86
+
+This capability indicates KVM's support for the event channel offload.
+Implies support for KVM_IRQ_ROUTING_XEN_EVTCHN irq routing, and
+for attribute KVM_XEN_ATTR_TYPE_EVTCHN in KVM_XEN_HVM_GET_ATTR or
+KVM_XEN_HVM_SET_ATTR.
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index e29cefd2dc6a..b1d9045d7989 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3010,6 +3010,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_SET_IDENTITY_MAP_ADDR:
case KVM_CAP_XEN_HVM:
case KVM_CAP_XEN_HVM_GUEST:
+ case KVM_CAP_XEN_HVM_EVTCHN:
case KVM_CAP_VCPU_EVENTS:
case KVM_CAP_HYPERV:
case KVM_CAP_HYPERV_VAPIC:
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 4eae47a0ef63..1b3ecce5f92e 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1004,6 +1004,7 @@ struct kvm_ppc_resize_hpt {
#define KVM_CAP_MANUAL_DIRTY_LOG_PROTECT 166
#define KVM_CAP_HYPERV_CPUID 167
#define KVM_CAP_XEN_HVM_GUEST 168
+#define KVM_CAP_XEN_HVM_EVTCHN 169
#ifdef KVM_CAP_IRQ_ROUTING
@@ -1046,6 +1047,7 @@ struct kvm_irq_routing_xen_evtchn {
#define KVM_IRQ_ROUTING_MSI 2
#define KVM_IRQ_ROUTING_S390_ADAPTER 3
#define KVM_IRQ_ROUTING_HV_SINT 4
+/* Available with KVM_CAP_XEN_HVM_EVTCHN */
#define KVM_IRQ_ROUTING_XEN_EVTCHN 5
struct kvm_irq_routing_entry {
@@ -1506,6 +1508,7 @@ struct kvm_xen_hvm_attr {
#define KVM_XEN_ATTR_TYPE_VCPU_INFO 0x1
#define KVM_XEN_ATTR_TYPE_VCPU_TIME_INFO 0x2
#define KVM_XEN_ATTR_TYPE_VCPU_RUNSTATE 0x3
+/* Available with KVM_CAP_XEN_HVM_EVTCHN */
#define KVM_XEN_ATTR_TYPE_EVTCHN 0x4
/* Secure Encrypted Virtualization command */
--
2.11.0
