machine, hostmem: improve error messages for unsupported features

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>

1 files changed, 16 insertions, 0 deletions

diff --git a/backends/hostmem.c b/backends/hostmem.c
index 1edc0ede2a..6da3d7383e 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");
+        }
+        assert(!backend->merge);
+        return;
+    }
+
     if (!host_memory_backend_mr_inited(backend)) {
         backend->merge = value;
         return;
@@ -196,6 +204,14 @@ 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");
+        }
+        assert(backend->dump);
+        return;
+    }
+
     if (!host_memory_backend_mr_inited(backend)) {
         backend->dump = value;
         return;