OpenE2K/qemu-e2k
13
4
Fork 0
Code Issues 4 Pull Requests Projects 2 Releases Activity

translate-all: honour CF_NOCACHE in tb_gen_code

Browse Source 
This fixes a record-replay regression introduced by 95590e2
("translate-all: discard TB when tb_link_page returns an existing
matching TB", 2018-06-15). The problem is that code using CF_NOCACHE
assumes that the TB returned from tb_gen_code is always a
newly-generated one. This assumption, however, was broken in
the aforementioned commit.

Fix it by honouring CF_NOCACHE, so that tb_gen_code always
returns a newly-generated TB when CF_NOCACHE is passed to it.
Do this by avoiding the TB hash table if CF_NOCACHE is set.

Reported-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
Tested-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Tested-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 1530806837-5416-1-git-send-email-cota@braap.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Emilio G. Cota 2018-07-05 12:07:17 -04:00 committed by Peter Maydell
parent 6d1d4276ae
commit ec7eb2ae77
1 changed files with 19 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
accel/tcg/translate-all.c
View File

@ -1446,7 +1446,8 @@ static void do_tb_phys_invalidate(TranslationBlock *tb, bool rm_from_page_list)
phys_pc = tb->page_addr[0] + (tb->pc & ~TARGET_PAGE_MASK);
h = tb_hash_func(phys_pc, tb->pc, tb->flags, tb_cflags(tb) & CF_HASH_MASK,
tb->trace_vcpu_dstate);
if (!qht_remove(&tb_ctx.htable, tb, h)) {
if (!(tb->cflags & CF_NOCACHE) &&
!qht_remove(&tb_ctx.htable, tb, h)) {
return;
}
@ -1604,8 +1605,6 @@ tb_link_page(TranslationBlock *tb, tb_page_addr_t phys_pc,
{
PageDesc *p;
PageDesc *p2 = NULL;
void *existing_tb = NULL;
uint32_t h;
assert_memory_lock();
@ -1625,20 +1624,25 @@ tb_link_page(TranslationBlock *tb, tb_page_addr_t phys_pc,
tb->page_addr[1] = -1;
}
/* add in the hash table */
h = tb_hash_func(phys_pc, tb->pc, tb->flags, tb->cflags & CF_HASH_MASK,
tb->trace_vcpu_dstate);
qht_insert(&tb_ctx.htable, tb, h, &existing_tb);
if (!(tb->cflags & CF_NOCACHE)) {
void *existing_tb = NULL;
uint32_t h;
/* remove TB from the page(s) if we couldn't insert it */
if (unlikely(existing_tb)) {
tb_page_remove(p, tb);
invalidate_page_bitmap(p);
if (p2) {
tb_page_remove(p2, tb);
invalidate_page_bitmap(p2);
/* add in the hash table */
h = tb_hash_func(phys_pc, tb->pc, tb->flags, tb->cflags & CF_HASH_MASK,
tb->trace_vcpu_dstate);
qht_insert(&tb_ctx.htable, tb, h, &existing_tb);
/* remove TB from the page(s) if we couldn't insert it */
if (unlikely(existing_tb)) {
tb_page_remove(p, tb);
invalidate_page_bitmap(p);
if (p2) {
tb_page_remove(p2, tb);
invalidate_page_bitmap(p2);
}
tb = existing_tb;
}
tb = existing_tb;
}
if (p2 && p2 != p) {