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accel/tcg: Honor TLB_DISCARD_WRITE in atomic_mmu_lookup 

Using an atomic write or read-write insn on ROM is basically
a happens-never case.  Handle it via stop-the-world, which
will generate non-atomic serial code, where we can correctly
ignore the write while producing the correct read result.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
master
Richard Henderson 2023-02-22 23:05:01 -10:00
parent 20f7fe93f5
commit 0953674ed0
1 changed files with 1 additions and 1 deletions
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2
accel/tcg/cputlb.c
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@ -1831,7 +1831,7 @@ static void *atomic_mmu_lookup(CPUArchState *env, target_ulong addr,
}
/* Notice an IO access or a needs-MMU-lookup access */
if (unlikely(tlb_addr & TLB_MMIO)) {
if (unlikely(tlb_addr & (TLB_MMIO | TLB_DISCARD_WRITE))) {
/* There's really nothing that can be done to
support this apart from stop-the-world. */
goto stop_the_world;