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accel/tcg: Test CPUJumpCache in tb_jmp_cache_clear_page 

After commit 4e4fa6c12d ("accel/tcg: Complete cpu initialization
before registration"), it looks the CPUJumpCache pointer can be NULL.
This causes a SIGSEV when running debug-wp-migration kvm unit test.

At the first place it should be clarified why this TCG code is called
with KVM acceleration. This may hide another bug.

Fixes: 4e4fa6c12d ("accel/tcg: Complete cpu initialization before registration")
Signed-off-by: Eric Auger <eric.auger@redhat.com>
Message-Id: <20230203171510.2867451-1-eric.auger@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Eric Auger 2023-02-03 18:15:10 +01:00 committed by Richard Henderson
parent 579510e196
commit 99ab4d500a
1 changed files with 6 additions and 1 deletions
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7
accel/tcg/cputlb.c
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@ -100,9 +100,14 @@ static void tlb_window_reset(CPUTLBDesc *desc, int64_t ns,
static void tb_jmp_cache_clear_page(CPUState *cpu, target_ulong page_addr)
{
int i, i0 = tb_jmp_cache_hash_page(page_addr);
CPUJumpCache *jc = cpu->tb_jmp_cache;
int i, i0;
if (unlikely(!jc)) {
return;
}
i0 = tb_jmp_cache_hash_page(page_addr);
for (i = 0; i < TB_JMP_PAGE_SIZE; i++) {
qatomic_set(&jc->array[i0 + i].tb, NULL);
}