diff --git a/libc/kernel/uapi/linux/kvm.h b/libc/kernel/uapi/linux/kvm.h
index ea6bca5..7e13990 100644
--- a/libc/kernel/uapi/linux/kvm.h
+++ b/libc/kernel/uapi/linux/kvm.h
@@ -137,10 +137,13 @@
 struct kvm_hyperv_exit {
 #define KVM_EXIT_HYPERV_SYNIC 1
 #define KVM_EXIT_HYPERV_HCALL 2
+#define KVM_EXIT_HYPERV_SYNDBG 3
   __u32 type;
+  __u32 pad1;
   union {
     struct {
       __u32 msr;
+      __u32 pad2;
       __u64 control;
       __u64 evt_page;
       __u64 msg_page;
@@ -150,6 +153,15 @@
       __u64 result;
       __u64 params[2];
     } hcall;
+    struct {
+      __u32 msr;
+      __u32 pad2;
+      __u64 control;
+      __u64 status;
+      __u64 send_page;
+      __u64 recv_page;
+      __u64 pending_page;
+    } syndbg;
   } u;
 };
 #define KVM_S390_GET_SKEYS_NONE 1
@@ -796,6 +808,8 @@
 #define KVM_CAP_S390_VCPU_RESETS 179
 #define KVM_CAP_S390_PROTECTED 180
 #define KVM_CAP_PPC_SECURE_GUEST 181
+#define KVM_CAP_HALT_POLL 182
+#define KVM_CAP_ASYNC_PF_INT 183
 #ifdef KVM_CAP_IRQ_ROUTING
 struct kvm_irq_routing_irqchip {
   __u32 irqchip;