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| author | David Hildenbrand <david@redhat.com> | 2020-10-08 10:30:28 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2020-11-03 07:19:26 -0500 |
| commit | c726aa69419ba2ecd38ae14dc62aaa189c3510e5 (patch) | |
| tree | 87a523b3e81c94a3152af5aaa6db73101a41b551 /include/hw/mem | |
| parent | 780a4d24e73dd0a7c7fc3f6f8b104aab70b7bfff (diff) | |
| download | qemu-c726aa69419ba2ecd38ae14dc62aaa189c3510e5.zip | |
memory-device: Add get_min_alignment() callback
Add a callback that can be used to express additional alignment
requirements (exceeding the ones from the memory region).
Will be used by virtio-mem to express special alignment requirements due
to manually configured, big block sizes (e.g., 1GB with an ordinary
memory-backend-ram). This avoids failing later when realizing, because
auto-detection wasn't able to assign a properly aligned address.
Reviewed-by: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Wei Yang <richardw.yang@linux.intel.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20201008083029.9504-6-david@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'include/hw/mem')
| -rw-r--r-- | include/hw/mem/memory-device.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/hw/mem/memory-device.h b/include/hw/mem/memory-device.h index 30d7e99f52..48d2611fc5 100644 --- a/include/hw/mem/memory-device.h +++ b/include/hw/mem/memory-device.h @@ -89,6 +89,16 @@ struct MemoryDeviceClass { MemoryRegion *(*get_memory_region)(MemoryDeviceState *md, Error **errp); /* + * Optional: Return the desired minimum alignment of the device in guest + * physical address space. The final alignment is computed based on this + * alignment and the alignment requirements of the memory region. + * + * Called when plugging the memory device to detect the required alignment + * during address assignment. + */ + uint64_t (*get_min_alignment)(const MemoryDeviceState *md); + + /* * Translate the memory device into #MemoryDeviceInfo. */ void (*fill_device_info)(const MemoryDeviceState *md, |