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[PULL 14/25] migration: mark mixed functions that can suspend
From: |
Paolo Bonzini |
Subject: |
[PULL 14/25] migration: mark mixed functions that can suspend |
Date: |
Fri, 21 Apr 2023 11:33:05 +0200 |
There should be no paths from a coroutine_fn to aio_poll, however in
practice coroutine_mixed_fn will call aio_poll in the !qemu_in_coroutine()
path. By marking mixed functions, we can track accurately the call paths
that execute entirely in coroutine context, and find more missing
coroutine_fn markers. This results in more accurate checks that
coroutine code does not end up blocking.
If the marking were extended transitively to all functions that call
these ones, static analysis could be done much more efficiently.
However, this is a start and makes it possible to use vrc's path-based
searches to find potential bugs where coroutine_fns call blocking functions.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
include/migration/qemu-file-types.h | 4 ++--
migration/qemu-file.c | 14 +++++++-------
migration/qemu-file.h | 6 +++---
3 files changed, 12 insertions(+), 12 deletions(-)
diff --git a/include/migration/qemu-file-types.h
b/include/migration/qemu-file-types.h
index 2867e3da84ab..1436f9ce92f3 100644
--- a/include/migration/qemu-file-types.h
+++ b/include/migration/qemu-file-types.h
@@ -35,7 +35,7 @@ void qemu_put_byte(QEMUFile *f, int v);
void qemu_put_be16(QEMUFile *f, unsigned int v);
void qemu_put_be32(QEMUFile *f, unsigned int v);
void qemu_put_be64(QEMUFile *f, uint64_t v);
-size_t qemu_get_buffer(QEMUFile *f, uint8_t *buf, size_t size);
+size_t coroutine_mixed_fn qemu_get_buffer(QEMUFile *f, uint8_t *buf, size_t
size);
int qemu_get_byte(QEMUFile *f);
@@ -161,7 +161,7 @@ static inline void qemu_get_sbe64s(QEMUFile *f, int64_t *pv)
qemu_get_be64s(f, (uint64_t *)pv);
}
-size_t qemu_get_counted_string(QEMUFile *f, char buf[256]);
+size_t coroutine_mixed_fn qemu_get_counted_string(QEMUFile *f, char buf[256]);
void qemu_put_counted_string(QEMUFile *f, const char *name);
diff --git a/migration/qemu-file.c b/migration/qemu-file.c
index 102ab3b4392c..ee04240a21ba 100644
--- a/migration/qemu-file.c
+++ b/migration/qemu-file.c
@@ -392,7 +392,7 @@ size_t ram_control_save_page(QEMUFile *f, ram_addr_t
block_offset,
* case if the underlying file descriptor gives a short read, and that can
* happen even on a blocking fd.
*/
-static ssize_t qemu_fill_buffer(QEMUFile *f)
+static ssize_t coroutine_mixed_fn qemu_fill_buffer(QEMUFile *f)
{
int len;
int pending;
@@ -585,7 +585,7 @@ void qemu_file_skip(QEMUFile *f, int size)
* return as many as it managed to read (assuming blocking fd's which
* all current QEMUFile are)
*/
-size_t qemu_peek_buffer(QEMUFile *f, uint8_t **buf, size_t size, size_t offset)
+size_t coroutine_mixed_fn qemu_peek_buffer(QEMUFile *f, uint8_t **buf, size_t
size, size_t offset)
{
ssize_t pending;
size_t index;
@@ -633,7 +633,7 @@ size_t qemu_peek_buffer(QEMUFile *f, uint8_t **buf, size_t
size, size_t offset)
* return as many as it managed to read (assuming blocking fd's which
* all current QEMUFile are)
*/
-size_t qemu_get_buffer(QEMUFile *f, uint8_t *buf, size_t size)
+size_t coroutine_mixed_fn qemu_get_buffer(QEMUFile *f, uint8_t *buf, size_t
size)
{
size_t pending = size;
size_t done = 0;
@@ -674,7 +674,7 @@ size_t qemu_get_buffer(QEMUFile *f, uint8_t *buf, size_t
size)
* Note: Since **buf may get changed, the caller should take care to
* keep a pointer to the original buffer if it needs to deallocate it.
*/
-size_t qemu_get_buffer_in_place(QEMUFile *f, uint8_t **buf, size_t size)
+size_t coroutine_mixed_fn qemu_get_buffer_in_place(QEMUFile *f, uint8_t **buf,
size_t size)
{
if (size < IO_BUF_SIZE) {
size_t res;
@@ -696,7 +696,7 @@ size_t qemu_get_buffer_in_place(QEMUFile *f, uint8_t **buf,
size_t size)
* Peeks a single byte from the buffer; this isn't guaranteed to work if
* offset leaves a gap after the previous read/peeked data.
*/
-int qemu_peek_byte(QEMUFile *f, int offset)
+int coroutine_mixed_fn qemu_peek_byte(QEMUFile *f, int offset)
{
int index = f->buf_index + offset;
@@ -713,7 +713,7 @@ int qemu_peek_byte(QEMUFile *f, int offset)
return f->buf[index];
}
-int qemu_get_byte(QEMUFile *f)
+int coroutine_mixed_fn qemu_get_byte(QEMUFile *f)
{
int result;
@@ -894,7 +894,7 @@ int qemu_put_qemu_file(QEMUFile *f_des, QEMUFile *f_src)
* else 0
* (Note a 0 length string will return 0 either way)
*/
-size_t qemu_get_counted_string(QEMUFile *f, char buf[256])
+size_t coroutine_fn qemu_get_counted_string(QEMUFile *f, char buf[256])
{
size_t len = qemu_get_byte(f);
size_t res = qemu_get_buffer(f, (uint8_t *)buf, len);
diff --git a/migration/qemu-file.h b/migration/qemu-file.h
index 9d0155a2a12e..d16cd504482a 100644
--- a/migration/qemu-file.h
+++ b/migration/qemu-file.h
@@ -108,8 +108,8 @@ bool qemu_file_is_writable(QEMUFile *f);
#include "migration/qemu-file-types.h"
-size_t qemu_peek_buffer(QEMUFile *f, uint8_t **buf, size_t size, size_t
offset);
-size_t qemu_get_buffer_in_place(QEMUFile *f, uint8_t **buf, size_t size);
+size_t coroutine_mixed_fn qemu_peek_buffer(QEMUFile *f, uint8_t **buf, size_t
size, size_t offset);
+size_t coroutine_mixed_fn qemu_get_buffer_in_place(QEMUFile *f, uint8_t **buf,
size_t size);
ssize_t qemu_put_compression_data(QEMUFile *f, z_stream *stream,
const uint8_t *p, size_t size);
int qemu_put_qemu_file(QEMUFile *f_des, QEMUFile *f_src);
@@ -119,7 +119,7 @@ int qemu_put_qemu_file(QEMUFile *f_des, QEMUFile *f_src);
* is; you aren't guaranteed to be able to peak to +n bytes unless you've
* previously peeked +n-1.
*/
-int qemu_peek_byte(QEMUFile *f, int offset);
+int coroutine_mixed_fn qemu_peek_byte(QEMUFile *f, int offset);
void qemu_file_skip(QEMUFile *f, int size);
/*
* qemu_file_credit_transfer:
--
2.40.0
- [PULL 04/25] nvme: remove constant argument to tracepoint, (continued)
- [PULL 04/25] nvme: remove constant argument to tracepoint, Paolo Bonzini, 2023/04/21
- [PULL 06/25] tests: bios-tables-test: replace memset with initializer, Paolo Bonzini, 2023/04/21
- [PULL 07/25] configure: Avoid -Werror=maybe-uninitialized, Paolo Bonzini, 2023/04/21
- [PULL 09/25] lasi: fix RTC migration, Paolo Bonzini, 2023/04/21
- [PULL 08/25] target/i386: Avoid unreachable variable declaration in mmu_translate(), Paolo Bonzini, 2023/04/21
- [PULL 11/25] target/mips: tcg: detect out-of-bounds accesses to cpu_gpr and cpu_gpr_hi, Paolo Bonzini, 2023/04/21
- [PULL 10/25] coverity: update COMPONENTS.md, Paolo Bonzini, 2023/04/21
- [PULL 13/25] io: mark mixed functions that can suspend, Paolo Bonzini, 2023/04/21
- [PULL 12/25] qapi-gen: mark coroutine QMP command functions as coroutine_fn, Paolo Bonzini, 2023/04/21
- [PULL 18/25] postcopy-ram: do not use qatomic_mb_read, Paolo Bonzini, 2023/04/21
- [PULL 14/25] migration: mark mixed functions that can suspend,
Paolo Bonzini <=
- [PULL 15/25] monitor: mark mixed functions that can suspend, Paolo Bonzini, 2023/04/21
- [PULL 16/25] target/i386: Change wrong XFRM value in SGX CPUID leaf, Paolo Bonzini, 2023/04/21
- [PULL 17/25] block-backend: remove qatomic_mb_read(), Paolo Bonzini, 2023/04/21
- [PULL 20/25] docs: explain effect of smp_read_barrier_depends() on modern architectures, Paolo Bonzini, 2023/04/21
- [PULL 21/25] nbd: a BlockExport always has a BlockBackend, Paolo Bonzini, 2023/04/21
- [PULL 23/25] configure: Honour cross-prefix when finding ObjC compiler, Paolo Bonzini, 2023/04/21
- [PULL 19/25] qemu-coroutine: remove qatomic_mb_read(), Paolo Bonzini, 2023/04/21
- [PULL 22/25] coverity: unify Fedora dockerfiles, Paolo Bonzini, 2023/04/21
- [PULL 25/25] tests: lcitool: Switch to OpenSUSE Leap 15.4, Paolo Bonzini, 2023/04/21
- [PULL 24/25] tests: libvirt-ci: Update to commit '2fa24dce8bc', Paolo Bonzini, 2023/04/21