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Re: [Qemu-devel] [PULL, 14/18] translate-all: discard TB when tb_link_pa
From: |
Emilio G. Cota |
Subject: |
Re: [Qemu-devel] [PULL, 14/18] translate-all: discard TB when tb_link_page returns an existing matching TB |
Date: |
Wed, 4 Jul 2018 15:38:08 -0400 |
User-agent: |
Mutt/1.5.24 (2015-08-30) |
On Tue, Jul 03, 2018 at 08:38:52 +0300, Pavel Dovgalyuk wrote:
> > From: Emilio G. Cota [mailto:address@hidden
> > On Mon, Jul 02, 2018 at 08:52:14 +0300, Pavel Dovgalyuk wrote:
> > > The same failure can be reproduced with linux-0.2.img, which was
> > > downloaded from QEMU site.
> > > I can't find it now, but I can upload this file if needed.
> >
> > Please upload it somewhere and share the full QEMU invocation
> > needed to replicate.
>
> https://github.com/Dovgalyuk/qemu-images/blob/master/linux-0.2.img
>
> qemu-system-i386 -drive file=images/linux-0.2.img,if=none,snapshot,id=img
> -drive
> driver=blkreplay,if=none,id=rr,image=img -device ide-hd,drive=rr -net none
> -icount
> shift=5,rr=record,rrfile=linux02.rr
The appended patch fixes it for me. Can you please test on your
windows image?
The rationale is to honour CF_NOCACHE, so that we always return
a new TB from tb_gen_code.
Thanks,
Emilio
---
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) {