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machine, hostmem: improve error messages for unsupported features

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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>
This commit is contained in:
Paolo Bonzini 2024-06-06 11:33:06 +02:00
parent 5d9a9a6170
commit a2b6a96505
2 changed files with 24 additions and 0 deletions
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16
backends/hostmem.c
View File

@ -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;

8
hw/core/machine.c
View File

@ -428,6 +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");
return;
}
ms->dump_guest_core = value;
}
@ -442,6 +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");
return;
}
ms->mem_merge = value;
}