From: Joao Martins <joao.m.martins@oracle.com>

This is when guest queries for support for HVMOP_pagetable_dying.

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
---
 target/i386/kvm/xen-emu.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/target/i386/kvm/xen-emu.c b/target/i386/kvm/xen-emu.c
index c23026b872..da77297ef9 100644
--- a/target/i386/kvm/xen-emu.c
+++ b/target/i386/kvm/xen-emu.c
@@ -22,6 +22,7 @@
 #include "hw/i386/kvm/xen_overlay.h"
 #include "standard-headers/xen/version.h"
 #include "standard-headers/xen/memory.h"
+#include "standard-headers/xen/hvm/hvm_op.h"
 
 #include "xen-compat.h"
 
@@ -303,6 +304,19 @@ static bool kvm_xen_hcall_memory_op(struct kvm_xen_exit *exit, X86CPU *cpu,
     return true;
 }
 
+static bool kvm_xen_hcall_hvm_op(struct kvm_xen_exit *exit, X86CPU *cpu,
+                                 int cmd, uint64_t arg)
+{
+    switch (cmd) {
+    case HVMOP_pagetable_dying:
+            exit->u.hcall.result = -ENOSYS;
+            return true;
+
+    default:
+            return false;
+    }
+}
+
 static bool do_kvm_xen_handle_exit(X86CPU *cpu, struct kvm_xen_exit *exit)
 {
     uint16_t code = exit->u.hcall.input;
@@ -313,6 +327,9 @@ static bool do_kvm_xen_handle_exit(X86CPU *cpu, struct kvm_xen_exit *exit)
     }
 
     switch (code) {
+    case __HYPERVISOR_hvm_op:
+        return kvm_xen_hcall_hvm_op(exit, cpu, exit->u.hcall.params[0],
+                                    exit->u.hcall.params[1]);
     case __HYPERVISOR_memory_op:
         return kvm_xen_hcall_memory_op(exit, cpu, exit->u.hcall.params[0],
                                        exit->u.hcall.params[1]);
-- 
2.35.3