From: David Hildenbrand <da...@redhat.com>
The block size determines the alignment requirements. Implement
get_min_alignment() of the TYPE_MEMORY_DEVICE interface.
This allows auto-assignment of a properly aligned address in guest
physical address space. For example, when specifying a 2GB block size
for a virtio-mem device with 10GB with a memory setup "-m 4G, 20G",
we'll no longer fail when realizing.
Reviewed-by: Pankaj Gupta <pankaj.gupta.li...@gmail.com>
Cc: "Michael S. Tsirkin" <m...@redhat.com>
Cc: Wei Yang <richardw.y...@linux.intel.com>
Cc: Dr. David Alan Gilbert <dgilb...@redhat.com>
Cc: Igor Mammedov <imamm...@redhat.com>
Cc: Pankaj Gupta <pankaj.gupta.li...@gmail.com>
Signed-off-by: David Hildenbrand <da...@redhat.com>
Message-Id: <20201008083029.9504-7-da...@redhat.com>
Reviewed-by: Michael S. Tsirkin <m...@redhat.com>
Signed-off-by: Michael S. Tsirkin <m...@redhat.com>
---
hw/virtio/virtio-mem-pci.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/hw/virtio/virtio-mem-pci.c b/hw/virtio/virtio-mem-pci.c
index 913f4a3326..fa5395cd88 100644
--- a/hw/virtio/virtio-mem-pci.c
+++ b/hw/virtio/virtio-mem-pci.c
@@ -76,6 +76,12 @@ static void virtio_mem_pci_fill_device_info(const
MemoryDeviceState *md,
info->type = MEMORY_DEVICE_INFO_KIND_VIRTIO_MEM;
}
+static uint64_t virtio_mem_pci_get_min_alignment(const MemoryDeviceState *md)
+{
+ return object_property_get_uint(OBJECT(md), VIRTIO_MEM_BLOCK_SIZE_PROP,
+ &error_abort);
+}
+
static void virtio_mem_pci_size_change_notify(Notifier *notifier, void *data)
{
VirtIOMEMPCI *pci_mem = container_of(notifier, VirtIOMEMPCI,
@@ -110,6 +116,7 @@ static void virtio_mem_pci_class_init(ObjectClass *klass,
void *data)
mdc->get_plugged_size = virtio_mem_pci_get_plugged_size;
mdc->get_memory_region = virtio_mem_pci_get_memory_region;
mdc->fill_device_info = virtio_mem_pci_fill_device_info;
+ mdc->get_min_alignment = virtio_mem_pci_get_min_alignment;
}
static void virtio_mem_pci_instance_init(Object *obj)
--
MST
