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Pull request 

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Merge tag 'block-pull-request' of https://gitlab.com/stefanha/qemu into staging

Pull request

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# gpg: Signature made Mon 22 Jan 2024 16:01:20 GMT
# gpg:                using RSA key 8695A8BFD3F97CDAAC35775A9CA4ABB381AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>" [full]
# gpg:                 aka "Stefan Hajnoczi <stefanha@gmail.com>" [full]
# Primary key fingerprint: 8695 A8BF D3F9 7CDA AC35  775A 9CA4 ABB3 81AB 73C8

* tag 'block-pull-request' of https://gitlab.com/stefanha/qemu:
  block/io: clear BDRV_BLOCK_RECURSE flag after recursing in bdrv_co_block_status
  coroutine-ucontext: Save fake stack for pooled coroutine

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2024-01-25 12:33:09 +00:00
parent 4a4efae44f 8a9be79924
commit bfbc456ad5
2 changed files with 36 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
block/io.c
View File

@ -2584,6 +2584,16 @@ bdrv_co_do_block_status(BlockDriverState *bs, bool want_zero,
ret |= (ret2 & BDRV_BLOCK_ZERO);
}
}
/*
* Now that the recursive search was done, clear the flag. Otherwise,
* with more complicated block graphs like snapshot-access ->
* copy-before-write -> qcow2, where the return value will be propagated
* further up to a parent bdrv_co_do_block_status() call, both the
* BDRV_BLOCK_RECURSE and BDRV_BLOCK_ZERO flags would be set, which is
* not allowed.
*/
ret &= ~BDRV_BLOCK_RECURSE;
}
out:

35
util/coroutine-ucontext.c
View File

@ -119,13 +119,11 @@ void finish_switch_fiber(void *fake_stack_save)
/* always_inline is required to avoid TSan runtime fatal errors. */
static inline __attribute__((always_inline))
void start_switch_fiber_asan(CoroutineAction action, void **fake_stack_save,
void start_switch_fiber_asan(void **fake_stack_save,
const void *bottom, size_t size)
{
#ifdef CONFIG_ASAN
__sanitizer_start_switch_fiber(
action == COROUTINE_TERMINATE ? NULL : fake_stack_save,
bottom, size);
__sanitizer_start_switch_fiber(fake_stack_save, bottom, size);
#endif
}
@ -165,7 +163,7 @@ static void coroutine_trampoline(int i0, int i1)
if (!sigsetjmp(self->env, 0)) {
CoroutineUContext *leaderp = get_ptr_leader();
start_switch_fiber_asan(COROUTINE_YIELD, &fake_stack_save,
start_switch_fiber_asan(&fake_stack_save,
leaderp->stack, leaderp->stack_size);
start_switch_fiber_tsan(&fake_stack_save, self, true); /* true=caller */
siglongjmp(*(sigjmp_buf *)co->entry_arg, 1);
@ -226,8 +224,7 @@ Coroutine *qemu_coroutine_new(void)
/* swapcontext() in, siglongjmp() back out */
if (!sigsetjmp(old_env, 0)) {
start_switch_fiber_asan(COROUTINE_YIELD, &fake_stack_save, co->stack,
co->stack_size);
start_switch_fiber_asan(&fake_stack_save, co->stack, co->stack_size);
start_switch_fiber_tsan(&fake_stack_save,
co, false); /* false=not caller */
@ -269,10 +266,28 @@ static inline void valgrind_stack_deregister(CoroutineUContext *co)
#endif
#endif
#if defined(CONFIG_ASAN) && defined(CONFIG_COROUTINE_POOL)
static void coroutine_fn terminate_asan(void *opaque)
{
CoroutineUContext *to = DO_UPCAST(CoroutineUContext, base, opaque);
set_current(opaque);
start_switch_fiber_asan(NULL, to->stack, to->stack_size);
G_STATIC_ASSERT(!IS_ENABLED(CONFIG_TSAN));
siglongjmp(to->env, COROUTINE_ENTER);
}
#endif
void qemu_coroutine_delete(Coroutine *co_)
{
CoroutineUContext *co = DO_UPCAST(CoroutineUContext, base, co_);
#if defined(CONFIG_ASAN) && defined(CONFIG_COROUTINE_POOL)
co_->entry_arg = qemu_coroutine_self();
co_->entry = terminate_asan;
qemu_coroutine_switch(co_->entry_arg, co_, COROUTINE_ENTER);
#endif
#ifdef CONFIG_VALGRIND_H
valgrind_stack_deregister(co);
#endif
@ -305,8 +320,10 @@ qemu_coroutine_switch(Coroutine *from_, Coroutine *to_,
ret = sigsetjmp(from->env, 0);
if (ret == 0) {
start_switch_fiber_asan(action, &fake_stack_save, to->stack,
to->stack_size);
start_switch_fiber_asan(IS_ENABLED(CONFIG_COROUTINE_POOL) ||
action != COROUTINE_TERMINATE ?
&fake_stack_save : NULL,
to->stack, to->stack_size);
start_switch_fiber_tsan(&fake_stack_save,
to, false); /* false=not caller */
siglongjmp(to->env, action);