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Cédric Le Goater 1d9a832b58 vfio: Remove workaround for kernel DMA unmap overflow bug 
A kernel bug was introduced in Linux v4.15 via commit 71a7d3d78e3c
("vfio/type1: Check for address space wrap-around on unmap"), which
added a test for address space wrap-around in the vfio DMA unmap path.
Unfortunately, due to an integer overflow, the kernel would
incorrectly detect an unmap of the last page in the 64-bit address
space as a wrap-around, causing the unmap to fail with -EINVAL.

A QEMU workaround was introduced in commit 567d7d3e6b ("vfio/common:
Work around kernel overflow bug in DMA unmap") to retry the unmap,
excluding the final page of the range.

The kernel bug was then fixed in Linux v5.0 via commit 58fec830fc19
("vfio/type1: Fix dma_unmap wrap-around check"). Since the oldest
supported LTS kernel is now v5.4, kernels affected by this bug are
considered deprecated, and the workaround is no longer necessary.

This change reverts 567d7d3e6b, removing the workaround.

Link: https://bugzilla.redhat.com/show_bug.cgi?id=1662291
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Link: https://lore.kernel.org/qemu-devel/20250926085423.375547-1-clg@redhat.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
2025-10-02 10:41:23 +02:00
..
9pfs 9pfs: Stop including gstrfuncs.h 2025-09-18 21:21:29 +02:00
acpi acpi: mark PMTIMER as unlocked 2025-08-29 12:48:14 +02:00
adc qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
alpha qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
arm hw/arm/aspeed_ast27x0-fc: Make sub-init functions return bool with errp 2025-09-29 18:00:20 +02:00
audio hw/audio/via-ac97: skip automatic zero-init of large array 2025-06-12 13:40:15 -04:00
avr qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
block hw/virtio: Build various files once 2025-07-15 02:56:39 -04:00
char hw/char/max78000_uart: Destroy FIFO on deinit 2025-09-02 17:57:05 +02:00
core * qom: Do not unparent in instance_finalize 2025-09-24 12:04:18 -07:00
cpu qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
cxl hw/cxl: mailbox-utils: 0x5605 - FMAPI Initiate DC Release 2025-07-15 02:56:40 -04:00
display hw/display/bcm2835_fb: Move inclusion of console.h to the .c file 2025-09-09 09:31:15 +02:00
dma hw/dma/xlnx_csu_dma: skip automatic zero-init of large array 2025-06-12 13:40:15 -04:00
fsi qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
gpio hw/gpio/pca9554: Avoid leak in pca9554_set_pin() 2025-09-02 17:57:05 +02:00
hppa qom: Make InterfaceInfo[] uses const 2025-04-25 17:00:41 +02:00
hyperv hv-balloon: hw/core/register: Do not unparent in instance_finalize() 2025-09-24 09:23:20 +02:00
i2c hw/arm: Replace TABs for spaces in OMAP board and device code 2025-05-14 14:29:47 +01:00
i386 hw/i386/pc_piix.c: remove unnecessary if() from pc_init1() 2025-09-02 17:58:05 +02:00
ide hw/ide/ich.c: Use qemu_init_irq_child() to avoid memory leak 2025-09-02 17:57:05 +02:00
input treewide: use qemu_set_blocking instead of g_unix_set_fd_nonblocking 2025-09-19 12:46:07 +01:00
intc ppc queue for 20250928 2025-09-29 07:25:28 -07:00
ipack qom: Make InterfaceInfo[] uses const 2025-04-25 17:00:41 +02:00
ipmi qom: Make InterfaceInfo[] uses const 2025-04-25 17:00:41 +02:00
isa hw/isa/superio: Include 'system/system.h' 2025-09-02 17:58:05 +02:00
loongarch hw/loongarch: Implement DINTC plug/unplug interfaces 2025-09-28 17:31:04 +08:00
m68k hw: add compat machines for 10.2 2025-08-27 07:07:53 +02:00
mem hw/cxl: mailbox-utils: 0x5604 - FMAPI Initiate DC Add 2025-07-15 02:56:40 -04:00
microblaze hw/microblaze: Add missing FDT dependency 2025-07-15 00:24:26 +02:00
mips hw/mips/malta: Silence warning from ubsan 2025-09-09 09:34:45 +02:00
misc hw/misc/aspeed_sbc: Handle OTP write command for voltage mode registers 2025-09-29 18:00:20 +02:00
net hw/net: Remove mipsnet device model 2025-09-02 17:57:05 +02:00
nubus qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
nvme hw/nvme: cap MDTS value for internal limitation 2025-08-11 00:17:38 -07:00
nvram hw/nvram/aspeed_otp: Add OTP programming semantics and tracing 2025-09-29 18:00:20 +02:00
openrisc add cpu_test_interrupt()/cpu_set_interrupt() helpers and use them tree wide 2025-08-29 12:48:14 +02:00
pci hw/pci: Introduce pci_setup_iommu_per_bus() for per-bus IOMMU ops retrieval 2025-09-16 17:31:54 +01:00
pci-bridge hw/arm/smmu-common: Check SMMU has PCIe Root Complex association 2025-09-16 17:31:54 +01:00
pci-host hw/pci-host/aspeed: Disable Root Device and place Root Port at 00:00.0 to AST2700 2025-09-29 18:00:20 +02:00
ppc ppc/spapr: init lrdr-capapcity phys with ram size if maxmem not provided 2025-09-28 23:45:28 +05:30
remote treewide: handle result of qio_channel_set_blocking() 2025-09-19 12:46:07 +01:00
riscv hw/riscv/virt-acpi-build.c: Update FADT and MADT versions 2025-07-30 10:59:26 +10:00
rtc hw/rtc/mc146818rtc: Drop pre-v3 migration stream support 2025-04-30 20:44:20 +02:00
rx qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
s390x hw/vfio/types.h: rename TYPE_VFIO_PCI_BASE to TYPE_VFIO_PCI_DEVICE 2025-09-25 17:55:20 +02:00
scsi hw/scsi/mptsas: Avoid silent integer truncation in MPI_FUNC_IOC_INIT 2025-09-02 17:57:05 +02:00
sd hw/sd/sdhci: Do not unparent in instance_finalize() 2025-09-24 09:23:20 +02:00
sensor qemu: Declare all load/store helper in 'qemu/bswap.h' 2025-07-15 02:56:39 -04:00
sh4 include: Remove 'exec/exec-all.h' 2025-04-30 12:45:05 -07:00
smbios qemu: Declare all load/store helper in 'qemu/bswap.h' 2025-07-15 02:56:39 -04:00
sparc qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
sparc64 qom: Make InterfaceInfo[] uses const 2025-04-25 17:00:41 +02:00
ssi hw/ssi/aspeed_smc: Fix incorrect FMC_WDT2 register read on AST1030 2025-08-04 09:07:38 +02:00
timer hpet: guard IRQ handling with BQL 2025-09-17 19:00:58 +02:00
tpm qom: Make InterfaceInfo[] uses const 2025-04-25 17:00:41 +02:00
tricore qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
uefi hw/uefi: open json file in binary mode 2025-08-12 08:03:16 +02:00
ufs hw/ufs/lu: skip automatic zero-init of large array 2025-06-12 13:40:16 -04:00
usb hw/usb/hcd-uhci: don't assert for SETUP to non-0 endpoint 2025-09-25 11:06:27 +01:00
vfio vfio: Remove workaround for kernel DMA unmap overflow bug 2025-10-02 10:41:23 +02:00
vfio-user vfio-user/pci.c: rename vfio_user_pci_dev_info to vfio_user_pci_info 2025-09-25 17:55:20 +02:00
virtio treewide: use qemu_set_blocking instead of g_unix_set_fd_nonblocking 2025-09-19 12:46:07 +01:00
vmapple qemu: Declare all load/store helper in 'qemu/bswap.h' 2025-07-15 02:56:39 -04:00
watchdog qom: Make InterfaceInfo[] uses const 2025-04-25 17:00:41 +02:00
xen hw/xen: Do not unparent in instance_finalize() 2025-09-24 09:23:20 +02:00
xenpv hw/boards: Do not create unusable default if=sd drives 2025-02-16 14:25:08 +01:00
xtensa qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
Kconfig vfio-user: add vfio-user class and container 2025-06-26 08:55:38 +02:00
meson.build hw/meson: enter target hw first 2025-09-02 17:57:05 +02:00