[PULL v2 00/31] Block patches

[PULL v2 00/31] Block patches

[Stefan Hajnoczi]

The following changes since commit d9ce74873a6a5a7c504379857461e4ae64fcf0cd:

  Merge tag 'pull-vfio-20250611' of https://github.com/legoater/qemu into staging (2025-06-11 11:39:53 -0400)

are available in the Git repository at:

  https://gitlab.com/stefanha/qemu.git tags/block-pull-request

for you to fetch changes up to 837b87c4c5ba9ac7a255133c6642b8d578272a70:

  net/stream: skip automatic zero-init of large array (2025-06-12 13:40:16 -0400)

----------------------------------------------------------------
Pull request

v2:
- Fix incorrect hw/audio/gus commit message

----------------------------------------------------------------

Daniel P. Berrangé (29):
  block: skip automatic zero-init of large array in ioq_submit
  chardev/char-fd: skip automatic zero-init of large array
  chardev/char-pty: skip automatic zero-init of large array
  chardev/char-socket: skip automatic zero-init of large array
  hw/audio/ac97: skip automatic zero-init of large arrays
  hw/audio/cs4231a: skip automatic zero-init of large arrays
  hw/audio/es1370: skip automatic zero-init of large array
  hw/audio/gus: skip automatic zero-init of large array
  hw/audio/marvell_88w8618: skip automatic zero-init of large array
  hw/audio/sb16: skip automatic zero-init of large array
  hw/audio/via-ac97: skip automatic zero-init of large array
  hw/char/sclpconsole-lm: skip automatic zero-init of large array
  hw/dma/xlnx_csu_dma: skip automatic zero-init of large array
  hw/display/vmware_vga: skip automatic zero-init of large struct
  hw/hyperv/syndbg: skip automatic zero-init of large array
  hw/misc/aspeed_hace: skip automatic zero-init of large array
  hw/net/rtl8139: skip automatic zero-init of large array
  hw/net/tulip: skip automatic zero-init of large array
  hw/net/virtio-net: skip automatic zero-init of large arrays
  hw/net/xgamc: skip automatic zero-init of large array
  hw/nvme/ctrl: skip automatic zero-init of large arrays
  hw/ppc/pnv_occ: skip automatic zero-init of large struct
  hw/ppc/spapr_tpm_proxy: skip automatic zero-init of large arrays
  hw/usb/hcd-ohci: skip automatic zero-init of large array
  hw/scsi/lsi53c895a: skip automatic zero-init of large array
  hw/scsi/megasas: skip automatic zero-init of large arrays
  hw/ufs/lu: skip automatic zero-init of large array
  net/socket: skip automatic zero-init of large array
  net/stream: skip automatic zero-init of large array

Stefan Hajnoczi (2):
  include/qemu/compiler: add QEMU_UNINITIALIZED attribute macro
  hw/virtio/virtio: avoid cost of -ftrivial-auto-var-init in hot path

 include/qemu/compiler.h    | 20 ++++++++++++++++++++
 block/linux-aio.c          |  2 +-
 chardev/char-fd.c          |  2 +-
 chardev/char-pty.c         |  2 +-
 chardev/char-socket.c      |  2 +-
 hw/audio/ac97.c            |  4 ++--
 hw/audio/cs4231a.c         |  4 ++--
 hw/audio/es1370.c          |  2 +-
 hw/audio/gus.c             |  2 +-
 hw/audio/marvell_88w8618.c |  2 +-
 hw/audio/sb16.c            |  2 +-
 hw/audio/via-ac97.c        |  2 +-
 hw/char/sclpconsole-lm.c   |  2 +-
 hw/display/vmware_vga.c    |  2 +-
 hw/dma/xlnx_csu_dma.c      |  2 +-
 hw/hyperv/syndbg.c         |  2 +-
 hw/misc/aspeed_hace.c      |  2 +-
 hw/net/rtl8139.c           |  2 +-
 hw/net/tulip.c             |  2 +-
 hw/net/virtio-net.c        |  6 +++---
 hw/net/xgmac.c             |  2 +-
 hw/nvme/ctrl.c             |  6 +++---
 hw/ppc/pnv_occ.c           |  2 +-
 hw/ppc/spapr_tpm_proxy.c   |  4 ++--
 hw/scsi/lsi53c895a.c       |  2 +-
 hw/scsi/megasas.c          |  7 ++-----
 hw/ufs/lu.c                |  2 +-
 hw/usb/hcd-ohci.c          |  2 +-
 hw/virtio/virtio.c         |  8 ++++----
 net/socket.c               |  2 +-
 net/stream.c               |  2 +-
 31 files changed, 61 insertions(+), 44 deletions(-)

-- 
2.49.0

[PULL v2 11/31] hw/audio/marvell_88w8618: skip automatic zero-init of large array

[Stefan Hajnoczi]

From: Daniel P. Berrangé <berrange@redhat.com>

The 'mv88w8618_audio_callback' method has a 4k byte array used for
copying data between the audio backend and device. Skip the automatic
zero-init of this array to eliminate the performance overhead in
the I/O hot path.

The 'buf' array will be fully initialized when reading data from
device memory.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20250610123709.835102-12-berrange@redhat.com
[Fixed hw/audio/gus in commit message --Stefan]
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 hw/audio/marvell_88w8618.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/audio/marvell_88w8618.c b/hw/audio/marvell_88w8618.c
index 6d3ebbb0c8..c5c79d083a 100644
--- a/hw/audio/marvell_88w8618.c
+++ b/hw/audio/marvell_88w8618.c
@@ -66,7 +66,7 @@ static void mv88w8618_audio_callback(void *opaque, int free_out, int free_in)
 {
     mv88w8618_audio_state *s = opaque;
     int16_t *codec_buffer;
-    int8_t buf[4096];
+    QEMU_UNINITIALIZED int8_t buf[4096];
     int8_t *mem_buffer;
     int pos, block_size;
 
-- 
2.49.0

Re: [PULL v2 00/31] Block patches

[Stefan Hajnoczi]

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Applied, thanks.

Please update the changelog at https://wiki.qemu.org/ChangeLog/10.1 for any user-visible changes.

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