The 'pty_chr_read' method has a 4k byte array used for copying
data between the PTY 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 off
the PTY.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20250610123709.835102-6-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
The 'fd_chr_read' method has a 4k byte array used for copying
data between the socket 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 off
the network socket.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20250610123709.835102-5-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
The 'ioq_submit' method has a struct array that is 8k in size.
Skip the automatic zero-init of this array to eliminate the
performance overhead in the I/O hot path.
The 'iocbs' array will selectively initialized when processing
the I/O data.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20250610123709.835102-4-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Since commit 7ff9ff0393 ("meson: mitigate against use of uninitialize
stack for exploits") the -ftrivial-auto-var-init=zero compiler option is
used to zero local variables. While this reduces security risks
associated with uninitialized stack data, it introduced a measurable
bottleneck in the virtqueue_split_pop() and virtqueue_packed_pop()
functions.
These virtqueue functions are in the hot path. They are called for each
element (request) that is popped from a VIRTIO device's virtqueue. Using
__attribute__((uninitialized)) on large stack variables in these
functions improves fio randread bs=4k iodepth=64 performance from 304k
to 332k IOPS (+9%).
This issue was found using perf-top(1). virtqueue_split_pop() was one of
the top CPU consumers and the "annotate" feature showed that the memory
zeroing instructions at the beginning of the functions were hot.
Fixes: 7ff9ff0393 ("meson: mitigate against use of uninitialize stack for exploits")
Cc: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20250610123709.835102-3-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
The QEMU_UNINITIALIZED macro is to be used to skip the default compiler
variable initialization done by -ftrivial-auto-var-init=zero.
Use this in cases where there a method in the device I/O path (or other
important hot paths), that has large variables on the stack. A rule of
thumb is that "large" means a method with 4kb data in the local stack
frame. Any variables which are KB in size, should be annotated with this
attribute, to pre-emptively eliminate any potential overhead from the
compiler zero'ing memory.
Given that this turns off a security hardening feature, when using this
to flag variables, it is important that the code is double-checked to
ensure there is no possible use of uninitialized data in the method.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-id: 20250610123709.835102-2-berrange@redhat.com
[DB: split off patch & rewrite guidance on when to use the annotation]
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Merge tag 'pull-loongarch-20250610' of https://github.com/gaosong715/qemu into staging
pull-loongarch_20250610
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# gpg: Signature made Tue 10 Jun 2025 03:04:45 EDT
# gpg: using RSA key B8FF1DA0D2FDCB2DA09C6C2C40A2FFF239263EDF
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* tag 'pull-loongarch-20250610' of https://github.com/gaosong715/qemu:
hw/loongarch/virt: Remove global variables about memmap tables
hw/loongarch/virt: Remove global variables about initrd
target/loongarch: add check for fcond
hw/loongarch/virt: inform guest of kvm
hw/intc/loongarch_extioi: Fix typo issue about register EXTIOI_COREISR_END
hw/intc/loongarch_pch: Convert to little endian with ID register
hw/loongarch/virt: Fix big endian support with MCFG table
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Move event_notifier_cleanup calls to a helper vfio_notifier_cleanup.
This version is trivial, and does not yet use the vdev and nr parameters.
No functional change.
Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/1749569991-25171-17-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Pass the vector number to vfio_connect_kvm_msi_virq and
vfio_remove_kvm_msi_virq, so it can be passed to their subroutines in
a subsequent patch. No functional change.
Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/1749569991-25171-15-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Move event_notifier_init calls to a helper vfio_notifier_init.
This version is trivial, but it will be expanded to support CPR
in subsequent patches. No functional change.
Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/1749569991-25171-14-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Do not reset a vfio-pci device during CPR, and do not complain if the
kernel's PCI config space changes for non-emulated bits between the
vmstate save and load, which can happen due to ongoing interrupt activity.
Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/1749569991-25171-12-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
If there are multiple containers and unmap-all fails for some container, we
need to remap vaddr for the other containers for which unmap-all succeeded.
Recover by walking all address ranges of all containers to restore the vaddr
for each. Do so by invoking the vfio listener callback, and passing a new
"remap" flag that tells it to restore a mapping without re-allocating new
userland data structures.
Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/1749569991-25171-9-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
During CPR, after VFIO_DMA_UNMAP_FLAG_VADDR, the vaddr is temporarily
invalid, so mediated devices cannot be supported. Add a blocker for them.
This restriction will not apply to iommufd containers when CPR is added
for them in a future patch.
Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/1749569991-25171-8-git-send-email-steven.sistare@oracle.com
[ clg: Fixed context change in VFIODevice ]
Signed-off-by: Cédric Le Goater <clg@redhat.com>
In new QEMU, do not register the memory listener at device creation time.
Register it later, in the container post_load handler, after all vmstate
that may affect regions and mapping boundaries has been loaded. The
post_load registration will cause the listener to invoke its callback on
each flat section, and the calls will match the mappings remembered by the
kernel.
The listener calls a special dma_map handler that passes the new VA of each
section to the kernel using VFIO_DMA_MAP_FLAG_VADDR. Restore the normal
handler at the end.
Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/1749569991-25171-7-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
In the container pre_save handler, discard the virtual addresses in DMA
mappings with VFIO_DMA_UNMAP_FLAG_VADDR, because guest RAM will be
remapped at a different VA after in new QEMU. DMA to already-mapped
pages continues.
Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/1749569991-25171-6-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
At vfio creation time, save the value of vfio container, group, and device
descriptors in CPR state. On qemu restart, vfio_realize() finds and uses
the saved descriptors.
During reuse, device and iommu state is already configured, so operations
in vfio_realize that would modify the configuration, such as vfio ioctl's,
are skipped. The result is that vfio_realize constructs qemu data
structures that reflect the current state of the device.
Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Link: https://lore.kernel.org/qemu-devel/1749569991-25171-5-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Register a legacy container for cpr-transfer, replacing the generic CPR
register call with a more specific legacy container register call. Add a
blocker if the kernel does not support VFIO_UPDATE_VADDR or VFIO_UNMAP_ALL.
This is mostly boiler plate. The fields to to saved and restored are added
in subsequent patches.
Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/1749569991-25171-4-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Define a vmstate priority that is lower than the default, so its handlers
run after all default priority handlers. Since 0 is no longer the default
priority, translate an uninitialized priority of 0 to MIG_PRI_DEFAULT.
CPR for vfio will use this to install handlers for containers that run
after handlers for the devices that they contain.
Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Peter Xu <peterx@redhat.com>
Link: https://lore.kernel.org/qemu-devel/1749569991-25171-3-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Add the cpr_incoming_needed, cpr_open_fd, and cpr_resave_fd helpers,
for use when adding cpr support for vfio and iommufd.
Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/1749569991-25171-2-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
For vfio-user, the region write implementation needs to know if the
write is posted; add the necessary plumbing to support this.
Signed-off-by: John Levon <john.levon@nutanix.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250607001056.335310-5-john.levon@nutanix.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
For vfio-user, each region has its own fd rather than sharing
vbasedev's. Add the necessary plumbing to support this, and use the
correct fd in vfio_region_mmap().
Signed-off-by: John Levon <john.levon@nutanix.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250607001056.335310-4-john.levon@nutanix.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
The vfio-user code will need to re-use various parts of the vfio PCI
code. Export them in hw/vfio/pci.h, and rename them to the vfio_pci_*
namespace.
Signed-off-by: John Levon <john.levon@nutanix.com>
Reviewed-by: Mark Cave-Ayland <mark.caveayland@nutanix.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250607001056.335310-2-john.levon@nutanix.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Handle interception of the CHSC SEI instruction for requests
indicating the guest's AP configuration has changed.
If configuring --without-default-devices, hw/s390x/ap-stub.c
was created to handle such circumstance. Also added the
following to hw/s390x/meson.build if CONFIG_VFIO_AP is
false, it will use the stub file.
Signed-off-by: Rorie Reyes <rreyes@linux.ibm.com>
Reviewed-by: Anthony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250609164418.17585-5-rreyes@linux.ibm.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
These functions can be invoked by the function that handles interception
of the CHSC SEI instruction for requests indicating the accessibility of
one or more adjunct processors has changed.
Signed-off-by: Rorie Reyes <rreyes@linux.ibm.com>
Reviewed-by: Anthony Krowiak <akrowiak@linux.ibm.com>
Link: https://lore.kernel.org/qemu-devel/20250609164418.17585-4-rreyes@linux.ibm.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Creates an object indicating that an AP configuration change event
has been received and stores it in a queue. These objects will later
be used to store event information for an AP configuration change
when the CHSC instruction is intercepted.
Signed-off-by: Rorie Reyes <rreyes@linux.ibm.com>
Reviewed-by: Anthony Krowiak <akrowiak@linux.ibm.com>
Link: https://lore.kernel.org/qemu-devel/20250609164418.17585-3-rreyes@linux.ibm.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Register an event notifier handler to process AP configuration
change events by queuing the event and generating a CRW to let
the guest know its AP configuration has changed
Signed-off-by: Rorie Reyes <rreyes@linux.ibm.com>
Reviewed-by: Anthony Krowiak <akrowiak@linux.ibm.com>
Link: https://lore.kernel.org/qemu-devel/20250609164418.17585-2-rreyes@linux.ibm.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Currently the final instance_size of VFIO_PCI_BASE is sizeof(PCIDevice).
It should be sizeof(VFIOPCIDevice), VFIO_PCI uses same structure as
base class VFIO_PCI_BASE, so no need to set its instance_size explicitly.
This isn't catastrophic only because VFIO_PCI_BASE is an abstract class.
Fixes: d4e392d0a9 ("vfio: add vfio-pci-base class")
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: John Levon <john.levon@nutanix.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>
Link: https://lore.kernel.org/qemu-devel/20250611024228.423666-1-zhenzhong.duan@intel.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
It's wrong to call into listener_begin callback in vfio_listener_commit().
Currently this impacts vfio-user.
Fixes: d9b7d8b699 ("vfio/container: pass listener_begin/commit callbacks")
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: John Levon <john.levon@nutanix.com>
Link: https://lore.kernel.org/qemu-devel/20250609115433.401775-1-zhenzhong.duan@intel.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
When changing meson_options.txt, this script gets updated automatically
by QEMU tooling which sorts the choices lexicographically.
Fixes: ccc403ed58 ("meson: Add wasm build in build scripts")
Signed-off-by: Bernhard Beschow <shentey@gmail.com>
Message-ID: <20250610204131.2862-4-shentey@gmail.com>
Tested-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
My contract with Daynix Computing Ltd. will expire by the end of May,
2025. As I may contribute to QEMU for my research, use my email address
at the lab.
As I'm the only maintainer of igb and no longer financially supported to
maintain it, change its status to Odd Fixes until someone steps up.
Signed-off-by: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20250531-rsg-v1-1-e0bae1e1d90e@rsg.ci.i.u-tokyo.ac.jp>
Signed-off-by: Thomas Huth <thuth@redhat.com>
When the testing docs were moved to a separate subfolder, the entries
in the MAINTAINERS file were missed. Update them now.
Fixes: ff41da5030 ("docs/devel: Split testing docs from the build docs and move to separate folder")
Reviewed-by: Ani Sinha <anisinha@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20250610053734.10417-1-thuth@redhat.com>
The README file in tests/vm/ points to a non-existent file,
docs/devel/testing.rst. Update the README to point to
docs/devel/testing/main.rst, which now contains information
about VM testing.
Signed-off-by: Haseung Bong <hasueng@gmail.com>
Fixes: ff41da5030 ("docs/devel: Split testing docs from the build docs and move to separate folder")
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20250607060456.28902-1-hasueng@gmail.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Add new tests to check the correctness of the `-overcommit memlock`
option (possible values: off, on, on-fault) by using
`/proc/{qemu_pid}/status` file to check in VmSize, VmRSS and VmLck
values:
* if `memlock=off`, then VmLck = 0;
* if `memlock=on`, then VmLck > 0 and almost all memory is resident;
* if `memlock=on-fault`, then VmLck > 0 and only few memory is resident.
Signed-off-by: Alexandr Moshkov <dtalexundeer@yandex-team.ru>
Message-ID: <20250605065908.299979-3-dtalexundeer@yandex-team.ru>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Used in future commit to skipping execution of a tests if the system's
locked memory limit is below the required threshold.
Signed-off-by: Alexandr Moshkov <dtalexundeer@yandex-team.ru>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20250605065908.299979-2-dtalexundeer@yandex-team.ru>
Signed-off-by: Thomas Huth <thuth@redhat.com>
We can simply check for the expected pattern on the console,
no need to wait for two seconds here to search for the pattern
in the log at the end.
While we're at it, also remove the obsolete "timeout" variable
from this test.
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Mark Cave-Ayland <mark.caveayland@nutanix.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20250603184710.25651-1-thuth@redhat.com>
The VNC test currently fails if the default machine ("pc" for x86)
has not been compiled into the binary. Since we also can test VNC
when QEMU just shows the default monitor, let's avoid this problem
by simply using the "none" machine (which is always available)
here instead.
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20250603103449.32499-1-thuth@redhat.com>
With the upcoming release of QEMU 10.1, the s390-ccw-virtio-4.1 machine
will be older than 6 years, so according to our machine support policy,
it can be removed now. The V4_1 CPU feature group gets merged into the
minimum CPU feature group now.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20250519054744.36715-1-thuth@redhat.com>
According to:
https://docs.travis-ci.com/user/billing-overview/#partner-queue-solution
only s390x and ppc64le are still part of the free OSS tier in Travis.
aarch64 has been removed sometime during the last year. Thus remove
the aarch64 job from our .travis.yml file now to avoid that someone
burns non-OSS CI credits with this job by accident now.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20250530115454.187727-1-thuth@redhat.com>
git shortlog rel-1.16.3..rel-1.17.0
-----------------------------------
Andrej Kruták (1):
Add AHCI Power ON + ICC_ACTIVE into port setup code
Daniel Khodabakhsh (2):
boot: Force display of the boot menu when boot-menu-wait is a negative number
usb-hid: Support multiple USB HID devices by storing them in a linked list
Daniel Verkamp (3):
vbe: Add VBE 2.0+ OemData field to struct vbe_info
vgasrc: round up save/restore size
vbe: implement function 09h (get/set palette data)
Daniil Tatianin (1):
pciinit: don't misalign large BARs
Gerd Hoffmann (6):
limit address space used for pci devices, part two
drop obsolete acpi table code
drop acpi tables and hex includes
add romfile_loadbool()
update pci_pad_mem64 handling
ahci: add controller reset
Igor Mammedov (1):
fix smbios blob length overflow
Jiaxun Yang (1):
ahci: Fix hangs due to controller reset
Kevin O'Connor (14):
vgasrc: Use curmode_g instead of vmode_g when mode is the current video mode
vgasrc: Rename vgahw_get_linesize() to vgahw_minimum_linelength()
stdvgamodes: No need to store pelmask in vga_modes[]
stdvgamodes: Improve naming of dac palette tables
stdvga: Rename CGA palette functions
stdvga: Add comments to interface functions in stdvga.c
stdvga: Rename stdvga_toggle_intensity() to stdvga_set_palette_blinking()
stdvga: Rework stdvga palette index paging interface functions
stdvga: Rename stdvga_set_text_block_specifier() to stdvga_set_font_location()
stdvga: Rename stdvga_set_scan_lines() to stdvga_set_character_height()
stdvga: Rename stdvga_get_vde() to stdvga_get_vertical_size()
stdvga: Add stdvga_set_vertical_size() helper function
stdvgaio: Only read/write one color palette entry at a time
docs: Note v1.17.0 release
Mark Cave-Ayland (2):
esp-scsi: terminate DMA transfer when ESP data transfer completes
esp-scsi: indicate acceptance of MESSAGE IN phase data
Max Tottenham (1):
Add LBA 64bit support for reads beyond 2TB.
Steven Price (1):
vgabios: Fix generating modes list for static_functionality
nikolar via SeaBIOS (1):
kconfig: fix the check-lxdialog.sh to work with gcc 14+
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
