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rust: vmstate: use const_refs_to_static

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The VMStateDescriptionBuilder already needs const_refs_static, so
use it to remove the need for vmstate_clock! and vmstate_struct!,
as well as to simplify the implementation for scalars.

If the consts in the VMState trait can reference to static
VMStateDescription, scalars do not need the info_enum_to_ref!
indirection and structs can implement the VMState trait themselves.

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20250908105005.2119297-9-pbonzini@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2025-09-08 12:49:40 +02:00
parent 7da9ee9207
commit dcdee1e718
6 changed files with 113 additions and 217 deletions
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5
docs/devel/rust.rst
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@ -84,11 +84,6 @@ patches are welcome:
* ``&raw`` (stable in 1.82.0).
* referencing statics in constants (stable in 1.83.0). For now use a const
function; this is an important limitation for QEMU's migration stream
architecture (VMState). Right now, VMState lacks type safety because
it is hard to place the ``VMStateField`` definitions in traits.
* NUL-terminated file names with ``#[track_caller]`` are scheduled for
inclusion as ``#![feature(location_file_nul)]``, but it will be a while
before QEMU can use them. For now, there is special code in