Detect early unsupported MADV_MERGEABLE and MADV_DONTDUMP, and print a clearer
error message that points to the deficiency of the host.

Cc: Michal Privoznik <mprivozn@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 backends/hostmem.c | 16 ++++++++++++++++
 hw/core/machine.c  |  9 +++++++++
 2 files changed, 25 insertions(+)

diff --git a/backends/hostmem.c b/backends/hostmem.c
index 4d6c69fe4de..584ee160f9c 100644
--- a/backends/hostmem.c
+++ b/backends/hostmem.c
@@ -170,6 +170,14 @@ static void host_memory_backend_set_merge(Object *obj, bool value, Error **errp)
 {
     HostMemoryBackend *backend = MEMORY_BACKEND(obj);
 
+    if (QEMU_MADV_MERGEABLE == QEMU_MADV_INVALID) {
+        if (value) {
+            error_setg(errp, "Memory merging is not supported on this host\n");
+        }
+        assert(!backend->merge);
+        return;
+    }
+
     if (!host_memory_backend_mr_inited(backend)) {
         backend->merge = value;
         return;
@@ -202,6 +210,14 @@ static void host_memory_backend_set_dump(Object *obj, bool value, Error **errp)
 {
     HostMemoryBackend *backend = MEMORY_BACKEND(obj);
 
+    if (QEMU_MADV_DONTDUMP == QEMU_MADV_INVALID) {
+        if (!value) {
+            error_setg(errp, "Dumping guest memory cannot be disabled on this host\n");
+        }
+        assert(backend->dump);
+        return;
+    }
+
     if (!host_memory_backend_mr_inited(backend)) {
         backend->dump = value;
         return;
diff --git a/hw/core/machine.c b/hw/core/machine.c
index c31a672051c..2ac1250f575 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -17,6 +17,7 @@
 #include "hw/loader.h"
 #include "qapi/error.h"
 #include "qapi/qapi-visit-machine.h"
+#include "qemu/madvise.h"
 #include "qom/object_interfaces.h"
 #include "sysemu/cpus.h"
 #include "sysemu/sysemu.h"
@@ -427,6 +428,10 @@ static void machine_set_dump_guest_core(Object *obj, bool value, Error **errp)
 {
     MachineState *ms = MACHINE(obj);
 
+    if (!value && QEMU_MADV_DONTDUMP == QEMU_MADV_INVALID) {
+        error_setg(errp, "Dumping guest memory cannot be disabled on this host\n");
+        return;
+    }
     ms->dump_guest_core = value;
 }
 
@@ -441,6 +446,10 @@ static void machine_set_mem_merge(Object *obj, bool value, Error **errp)
 {
     MachineState *ms = MACHINE(obj);
 
+    if (value && QEMU_MADV_MERGEABLE == QEMU_MADV_INVALID) {
+        error_setg(errp, "Memory merging is not supported on this host\n");
+        return;
+    }
     ms->mem_merge = value;
 }
 
-- 
2.45.1