aboutsummaryrefslogtreecommitdiff
path: root/accel
diff options
context:
space:
mode:
authorEmilio G. Cota <cota@braap.org>2018-07-05 12:07:17 -0400
committerPeter Maydell <peter.maydell@linaro.org>2018-07-09 16:14:36 +0100
commitec7eb2ae77cc207064e17ace048f7ec0c4b85d6f (patch)
treead3b328853c61619b35bdabf21721156ac41377b /accel
parent6d1d4276aea9773af97fed651cb205aab4f1b163 (diff)
downloadqemu-ec7eb2ae77cc207064e17ace048f7ec0c4b85d6f.zip
qemu-ec7eb2ae77cc207064e17ace048f7ec0c4b85d6f.tar.gz
qemu-ec7eb2ae77cc207064e17ace048f7ec0c4b85d6f.tar.bz2
translate-all: honour CF_NOCACHE in tb_gen_code
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>
Diffstat (limited to 'accel')
-rw-r--r--accel/tcg/translate-all.c34
1 files changed, 19 insertions, 15 deletions
diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c
index 170b957..49d77fa 100644
--- a/accel/tcg/translate-all.c
+++ b/accel/tcg/translate-all.c
@@ -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) {