i386/xen: implement HYPERVISOR_hvm_op

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>
Reviewed-by: Paul Durrant <paul@xen.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/target/i386/kvm/xen-emu.c b/target/i386/kvm/xen-emu.c
index 2b235e7b27..4002b1b797 100644
--- a/target/i386/kvm/xen-emu.c
+++ b/target/i386/kvm/xen-emu.c
@@ -26,6 +26,7 @@
 #include "hw/xen/interface/version.h"
 #include "hw/xen/interface/sched.h"
 #include "hw/xen/interface/memory.h"
+#include "hw/xen/interface/hvm/hvm_op.h"
 
 #include "xen-compat.h"
 
@@ -349,6 +350,19 @@ 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;
+    }
+}
+
 int kvm_xen_soft_reset(void)
 {
     int err;
@@ -450,6 +464,9 @@ static bool do_kvm_xen_handle_exit(X86CPU *cpu, struct kvm_xen_exit *exit)
     case __HYPERVISOR_sched_op:
         return kvm_xen_hcall_sched_op(exit, cpu, exit->u.hcall.params[0],
                                       exit->u.hcall.params[1]);
+    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]);