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restore: flush caches during restore

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See the previous commit for rationale and architecture-specific details.

[ avagin: tweak code comment ]

Signed-off-by: Ignacio Moreno Gonzalez <Ignacio.MorenoGonzalez@kuka.com>
Signed-off-by: Andrei Vagin <avagin@gmail.com>
This commit is contained in:
Ignacio Moreno Gonzalez 2025-07-16 16:38:13 +02:00 • committed by Andrei Vagin
parent 95d5e2e59b
commit 64276874d8
1 changed files with 11 additions and 0 deletions
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11
criu/cr-restore.c
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@ -2569,6 +2569,17 @@ static int remap_restorer_blob(void *addr)
restorer_setup_c_header_desc(&pbd, true);
compel_relocs_apply(addr, addr, &pbd);
/*
* Ensure the infected thread sees the updated code.
*
* On architectures like ARM64, the Data Cache (D-cache) and
* Instruction Cache (I-cache) are not automatically coherent.
* Modifications land in the D-cache, so we must flush (clean) the
* D-cache to push changes to RAM to ensure the CPU fetches the updated
* instructions.
*/
__builtin___clear_cache(addr, addr + pbd.hdr.bsize);
return 0;
}