Merge tag 'pull-request-2023-04-28' of https://gitlab.com/thuth/qemu into staging

* Prevent reentrant DMA accesses by default
* Only compile hw/rdma code when necessary
* Fix a potential locking issue in the vhost-user-test
* Offer more registers in GDB for s390x TCG

# -----BEGIN PGP SIGNATURE-----
#
# iQJFBAABCAAvFiEEJ7iIR+7gJQEY8+q5LtnXdP5wLbUFAmRLlDkRHHRodXRoQHJl
# ZGhhdC5jb20ACgkQLtnXdP5wLbU98RAApVbehXIXMF4lm0B4/pTRlP7CEjbKvNdQ
# Ca/xuqiCctjisJWQMLf8WDdymzaA02ycSYo0X9diO4uisKog4kN4uYje3VTbSJnx
# 7a0MlOpUqP6AR3hZYy5y/wv1M7Yjfhnj7yTUsAo/mQYoZmvqRviNwJ6ekdIU9J4W
# V2EfY+R/ebNami9VvuHTqudcZxmmR+4S5m5JipeHvjFE0DJucES0S8sN3W+iSCxG
# ydqG02CUoZtoorkJZccy3FPyeTVHgvcNqJbhAA5pFBgo30L+mx0llqztzLnWnLCe
# GWvpW2lZ2jC5MOg8oEpbiR807eB3ITpzCu9SX0IUOxMUHpGtl49sx1WNFrrlgD4Z
# b+mZSwJx4grwkU8iD/nF0apQoqEIAH6VSyRAIq1yLAsq1H4/K4c8M+bZ/jAD+gw+
# +DujZIPJ6Gcu3BeqWgOcOY1rRol3ksmRYlU8GrHTR/zIU+q3h7Gk3aH4+Ore1qnE
# hI/YzyyZlQgFMvENqakPJIS9IH+h41gCltwE8YxqJyUWIBfRs7iBMzdxQuUW+c2b
# n6OPYqeDlQt4hEpq4mUtZ+aJV1ey6kyk5ESLTj8QaJiZtcT1+lmvZX2ug2oeyrJm
# ys2458ulKZu0rGjXWWXNFB8u3MM9xN/PLqeD/wKShyLzkit5Nfx4azw5LPbmjrbj
# Twmf1HGeUiY=
# =v84A
# -----END PGP SIGNATURE-----
# gpg: Signature made Fri 28 Apr 2023 10:39:05 AM BST
# gpg:                using RSA key 27B88847EEE0250118F3EAB92ED9D774FE702DB5
# gpg:                issuer "thuth@redhat.com"
# gpg: Good signature from "Thomas Huth <th.huth@gmx.de>" [undefined]
# gpg:                 aka "Thomas Huth <thuth@redhat.com>" [undefined]
# gpg:                 aka "Thomas Huth <th.huth@posteo.de>" [unknown]
# gpg:                 aka "Thomas Huth <huth@tuxfamily.org>" [undefined]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 27B8 8847 EEE0 2501 18F3  EAB9 2ED9 D774 FE70 2DB5

* tag 'pull-request-2023-04-28' of https://gitlab.com/thuth/qemu:
  apic: disable reentrancy detection for apic-msi
  raven: disable reentrancy detection for iomem
  bcm2835_property: disable reentrancy detection for iomem
  lsi53c895a: disable reentrancy detection for script RAM
  hw: replace most qemu_bh_new calls with qemu_bh_new_guarded
  checkpatch: add qemu_bh_new/aio_bh_new checks
  async: Add an optional reentrancy guard to the BH API
  memory: prevent dma-reentracy issues
  tests: vhost-user-test: release mutex on protocol violation
  hw/rdma: VMW_PVRDMA should depend on VMXNET3_PCI
  hw/rdma: Compile target-independent parts of the rdma code only once
  hw/rdma: Remove unused macros PG_DIR_SZ and PG_TBL_SZ
  s390x/gdb: Split s390-virt.xml

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/docs/devel/multiple-iothreads.txt b/docs/devel/multiple-iothreads.txt
index 343120f2ef..a3e949f6b3 100644
--- a/docs/devel/multiple-iothreads.txt
+++ b/docs/devel/multiple-iothreads.txt
@@ -61,6 +61,7 @@ There are several old APIs that use the main loop AioContext:
  * LEGACY qemu_aio_set_event_notifier() - monitor an event notifier
  * LEGACY timer_new_ms() - create a timer
  * LEGACY qemu_bh_new() - create a BH
+ * LEGACY qemu_bh_new_guarded() - create a BH with a device re-entrancy guard
  * LEGACY qemu_aio_wait() - run an event loop iteration
 
 Since they implicitly work on the main loop they cannot be used in code that
@@ -72,8 +73,14 @@ Instead, use the AioContext functions directly (see include/block/aio.h):
  * aio_set_event_notifier() - monitor an event notifier
  * aio_timer_new() - create a timer
  * aio_bh_new() - create a BH
+ * aio_bh_new_guarded() - create a BH with a device re-entrancy guard
  * aio_poll() - run an event loop iteration
 
+The qemu_bh_new_guarded/aio_bh_new_guarded APIs accept a "MemReentrancyGuard"
+argument, which is used to check for and prevent re-entrancy problems. For
+BHs associated with devices, the reentrancy-guard is contained in the
+corresponding DeviceState and named "mem_reentrancy_guard".
+
 The AioContext can be obtained from the IOThread using
 iothread_get_aio_context() or for the main loop using qemu_get_aio_context().
 Code that takes an AioContext argument works both in IOThreads or the main