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translate-all: make l1_map lockless

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Groundwork for supporting parallel TCG generation.

We never remove entries from the radix tree, so we can use cmpxchg
to implement lockless insertions.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Emilio G. Cota 2017-07-26 20:15:41 -04:00 • committed by Richard Henderson
parent 1e05197f24
commit 78722ed0b8
2 changed files with 16 additions and 12 deletions
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4
docs/devel/multi-thread-tcg.txt
View file

@ -134,8 +134,8 @@ tb_set_jmp_target() code. Modification to the linked lists that allow
searching for linked pages are done under the protect of the
tb_lock().
The global page table is protected by the tb_lock() in system-mode and
mmap_lock() in linux-user mode.
The global page table is a lockless radix tree; cmpxchg is used
to atomically insert new elements.
The lookup caches are updated atomically and the lookup hash uses QHT
which is designed for concurrent safe lookup.