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util: exclude mmap-alloc.c from compilation target on Emscripten

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Emscripten does not support partial unmapping of mmapped memory
regions[1]. This limitation prevents correct implementation of qemu_ram_mmap
and qemu_ram_munmap, which rely on partial unmap behavior.

As a workaround, this commit excludes mmap-alloc.c from the Emscripten
build. Instead, for Emscripten build, this modifies qemu_anon_ram_alloc to
use qemu_memalign in place of qemu_ram_mmap, and disable memory backends
that rely on mmap, such as memory-backend-file and memory-backend-shm.

[1] d4a74336f2/system/lib/libc/emscripten_mmap.c (L61)

Signed-off-by: Kohei Tokunaga <ktokunaga.mail@gmail.com>
Link: https://lore.kernel.org/r/76834f933ee4f14eeb5289d21c59d306886e58e9.1745820062.git.ktokunaga.mail@gmail.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Kohei Tokunaga 2025-04-28 15:39:05 +09:00 • committed by Paolo Bonzini
parent 1a89644240
commit 8e72b0eb18
5 changed files with 41 additions and 8 deletions
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6
backends/meson.build
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@ -12,8 +12,10 @@ system_ss.add([files(
if host_os != 'windows'
system_ss.add(files('rng-random.c'))
system_ss.add(files('hostmem-file.c'))
system_ss.add([files('hostmem-shm.c'), rt])
if host_os != 'emscripten'
system_ss.add(files('hostmem-file.c'))
system_ss.add([files('hostmem-shm.c'), rt])
endif
endif
if host_os == 'linux'
system_ss.add(files('hostmem-memfd.c'))