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tcg: Init TB's direct jumps before making it visible

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Initialize TB's direct jump list data fields and reset the jumps before
tb_link_page() puts it into the physical hash table and the physical
page list. So TB is completely initialized before it becomes visible.

This is pure rearrangement of code to a more suitable place, though it
could be a preparation for relaxing the locking scheme in future.

Backports commit 901bc3deb43bf37c85e43955905d003be7ae5fa5 from qemu
This commit is contained in:
Sergey Fedorov 2018-02-23 21:30:06 -05:00 committed by Lioncash
parent 87f2bb42d4
commit e93f68a755
No known key found for this signature in database
GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 19 additions and 13 deletions
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32
qemu/translate-all.c
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@ -1240,19 +1240,6 @@ static void tb_link_page(struct uc_struct *uc,
tb->page_addr[1] = -1;
}
assert(((uintptr_t)tb & 3) == 0);
tb->jmp_list_first = (uintptr_t)tb | 2;
tb->jmp_list_next[0] = (uintptr_t)NULL;
tb->jmp_list_next[1] = (uintptr_t)NULL;
/* init original jump addresses */
if (tb->jmp_reset_offset[0] != TB_JMP_RESET_OFFSET_INVALID) {
tb_reset_jump(tb, 0);
}
if (tb->jmp_reset_offset[1] != TB_JMP_RESET_OFFSET_INVALID) {
tb_reset_jump(tb, 1);
}
#ifdef DEBUG_TB_CHECK
tb_page_check();
#endif
@ -1370,6 +1357,20 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
ROUND_UP((uintptr_t)gen_code_buf + gen_code_size + search_size,
CODE_GEN_ALIGN);
/* init jump list */
assert(((uintptr_t)tb & 3) == 0);
tb->jmp_list_first = (uintptr_t)tb | 2;
tb->jmp_list_next[0] = (uintptr_t)NULL;
tb->jmp_list_next[1] = (uintptr_t)NULL;
/* init original jump addresses wich has been set during tcg_gen_code() */
if (tb->jmp_reset_offset[0] != TB_JMP_RESET_OFFSET_INVALID) {
tb_reset_jump(tb, 0);
}
if (tb->jmp_reset_offset[1] != TB_JMP_RESET_OFFSET_INVALID) {
tb_reset_jump(tb, 1);
}
phys_page2 = -1;
/* check next page if needed */
if (tb->size) {
@ -1378,6 +1379,11 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
phys_page2 = get_page_addr_code(env, virt_page2);
}
}
/* As long as consistency of the TB stuff is provided by tb_lock in user
* mode and is implicit in single-threaded softmmu emulation, no explicit
* memory barrier is required before tb_link_page() makes the TB visible
* through the physical hash table and physical page list.
*/
tb_link_page(cpu->uc, tb, phys_pc, phys_page2);
return tb;
}