diff options
Diffstat (limited to 'include/hw/mem/memory-device.h')
| -rw-r--r-- | include/hw/mem/memory-device.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/include/hw/mem/memory-device.h b/include/hw/mem/memory-device.h index 3354d6c166..a1d62cc551 100644 --- a/include/hw/mem/memory-device.h +++ b/include/hw/mem/memory-device.h @@ -38,6 +38,10 @@ typedef struct MemoryDeviceState MemoryDeviceState; * address in guest physical memory can either be specified explicitly * or get assigned automatically. * + * Some memory device might not own a memory region in certain device + * configurations. Such devices can logically get (un)plugged, however, + * empty memory devices are mostly ignored by the memory device code. + * * Conceptually, memory devices only span one memory region. If multiple * successive memory regions are used, a covering memory region has to * be provided. Scattered memory regions are not supported for single @@ -91,7 +95,8 @@ struct MemoryDeviceClass { uint64_t (*get_plugged_size)(const MemoryDeviceState *md, Error **errp); /* - * Return the memory region of the memory device. + * Return the memory region of the memory device. If the device is + * completely empty, returns NULL without an error. * * Called when (un)plugging the memory device, to (un)map the * memory region in guest physical memory, but also to detect the |