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410b4d560d
qemu/hw
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Ross Lagerwall 410b4d560d xen-hvm: Avoid livelock while handling buffered ioreqs 
A malicious or buggy guest may generated buffered ioreqs faster than
QEMU can process them in handle_buffered_iopage(). The result is a
livelock - QEMU continuously processes ioreqs on the main thread without
iterating through the main loop which prevents handling other events,
processing timers, etc. Without QEMU handling other events, it often
results in the guest becoming unsable and makes it difficult to stop the
source of buffered ioreqs.

To avoid this, if we process a full page of buffered ioreqs, stop and
reschedule an immediate timer to continue processing them. This lets
QEMU go back to the main loop and catch up.

Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Reviewed-by: Paul Durrant <paul@xen.org>
Message-Id: <20240404140833.1557953-1-ross.lagerwall@citrix.com>
Signed-off-by: Anthony PERARD <anthony@xenproject.org>
2024-07-01 14:57:18 +02:00
..
9pfs hw/xen: Make XenDevOps structures const 2024-06-04 11:53:43 +02:00
acpi hw/acpi/ich9: Remove dead code related to 'acpi_memory_hotplug' 2024-06-19 12:40:49 +02:00
adc hw, target: Add ResetType argument to hold and exit phase methods 2024-04-25 10:21:06 +01:00
alpha alpha: switch boards to "default y" 2024-05-03 15:47:47 +02:00
arm hw/arm/bcm2836: Remove unusued struct 'BCM283XClass' 2024-06-30 19:51:44 +03:00
audio hw/audio/virtio-snd: Always use little endian audio format 2024-06-19 12:40:49 +02:00
avr avr: switch boards to "default y" 2024-05-03 15:47:47 +02:00
block virtio-blk: remove SCSI passthrough functionality 2024-06-05 11:01:05 +02:00
char hw: arm: Remove use of tabs in some source files 2024-05-28 14:20:48 +01:00
core hw/core/loader: gunzip(): fix memory leak on error path 2024-06-30 19:51:44 +03:00
cpu hw: Add a Kconfig switch for the TYPE_CPU_CLUSTER device 2024-04-25 12:48:12 +02:00
cris cris: switch boards to "default y" 2024-05-03 15:47:47 +02:00
cxl hw/cxl/cxl-cdat: Make cxl_doe_cdat_init() return boolean 2024-04-25 12:48:12 +02:00
display ui+display: rename is_buffer_shared() -> surface_is_allocated() 2024-06-19 12:42:03 +02:00
dma hw/dma: Add a trace log for a description loading failure 2024-06-18 14:52:00 +02:00
fsi hw/fsi: Aspeed APB2OPB & On-chip peripheral bus 2024-02-01 08:33:18 +01:00
gpio hw: arm: Remove use of tabs in some source files 2024-05-28 14:20:48 +01:00
hppa hw/hppa/machine: Replace g_memdup() by g_memdup2() 2024-05-08 19:42:45 +02:00
hyperv kvm: move target-dependent interrupt routing out of kvm-all.c 2024-05-03 15:47:48 +02:00
i2c hw, target: Add ResetType argument to hold and exit phase methods 2024-04-25 10:21:06 +01:00
i386 hw/xen: detect when running inside stubdomain 2024-07-01 14:57:18 +02:00
ide hw/ide/atapi: Use qemu_hexdump_line to avoid sprintf 2024-06-05 12:14:20 -07:00
input hw: arm: Remove use of tabs in some source files 2024-05-28 14:20:48 +01:00
intc hw/intc/arm_gic: Fix deactivation of SPI lines 2024-06-21 14:01:58 +01:00
ipack hw/ipack: Constify VMState 2023-12-29 11:17:30 +11:00
ipmi hw/ipmi: Constify VMState 2023-12-29 11:17:30 +11:00
isa hw/isa/vt82c686: Keep track of PIRQ/PINT pins separately 2024-04-15 13:07:11 +02:00
loongarch hw/mem/pc-dimm: Remove legacy_align argument from pc_dimm_pre_plug() 2024-06-19 12:40:49 +02:00
m68k m68k: switch boards to "default y" 2024-05-03 15:47:47 +02:00
mem hw/mem/memory-device: Remove legacy_align from memory_device_pre_plug() 2024-06-19 12:40:49 +02:00
microblaze microblaze: switch boards to "default y" 2024-05-03 15:47:47 +02:00
mips hw/mips/loongson3_virt: Wire up loongson_ipi device 2024-06-19 12:42:03 +02:00
misc hw/misc: Set valid access size for Exynos4210 RNG 2024-06-21 16:20:45 +01:00
net hw/net/can/xlnx-versal-canfd: Fix sorting of the tx queue 2024-06-21 14:01:58 +01:00
nubus hw/nubus: add nubus-virtio-mmio device 2024-02-27 09:36:39 +01:00
nvme hw/nvme: fix -Werror=maybe-uninitialized 2024-04-02 16:15:07 +02:00
nvram hw, target: Add ResetType argument to hold and exit phase methods 2024-04-25 10:21:06 +01:00
openrisc kconfig: express dependency of individual boards on libfdt 2024-05-10 15:45:15 +02:00
pci HostIOMMUDevice: Store the aliased bus and devfn 2024-06-24 23:15:30 +02:00
pci-bridge Misc HW patch queue 2024-04-25 09:43:29 -07:00
pci-host hw/ppc: Avoid using Monitor in pnv_phb4_pic_print_info() 2024-06-19 12:40:49 +02:00
pcmcia hw/pcmcia/pxa2xx: Inline pxa2xx_pcmcia_init() 2023-10-27 12:48:57 +01:00
ppc ppc/pnv: Introduce pnv_chip_foreach_cpu() 2024-06-19 12:40:49 +02:00
remote hw/remote/vfio-user: Fix config space access byte order 2024-05-08 19:43:15 +02:00
riscv hw/riscv/virt.c: Make block devices default to virtio 2024-06-26 23:00:59 +10:00
rtc hw/i386: move rtc-reset-reinjection command out of hw/rtc 2024-05-10 15:45:15 +02:00
rx kconfig: express dependency of individual boards on libfdt 2024-05-10 15:45:15 +02:00
s390x target/s390x: Add a CONFIG switch to disable legacy CPUs 2024-06-24 08:22:30 +02:00
scsi scsi-disk: Fix crash for VM configured with USB CDROM after live migration 2024-06-10 19:01:08 +02:00
sd hw/sd/sdcard: Add comments around registers and commands 2024-06-24 15:08:40 +02:00
sensor hw, target: Add ResetType argument to hold and exit phase methods 2024-04-25 10:21:06 +01:00
sh4 hw/sh4: Remove newline character in trace events 2024-06-10 13:05:27 -04:00
smbios hw/smbios: Remove 'smbios_uuid_encoded', simplify smbios_encode_uuid() 2024-06-19 12:40:49 +02:00
sparc sparc: switch boards to "default y" 2024-05-03 15:47:48 +02:00
sparc64 qemu-sparc queue 2024-05-06 10:19:56 -07:00
ssi aspeed/smc: Add AST2700 support 2024-06-16 21:08:54 +02:00
timer hw/timer/a9gtimer: Handle QTest mode in a9_gtimer_get_current_cpu 2024-06-21 14:01:59 +01:00
tpm hw/tpm: Remove HOST_PAGE_ALIGN from tpm_ppi_init 2024-02-29 11:35:36 -10:00
tricore tricore: switch boards to "default y" 2024-05-03 15:47:48 +02:00
ufs hw/ufs: Fix potential bugs in MMIO read|write 2024-06-30 12:44:32 +09:00
usb hw/usb/hcd-ohci: Fix ohci_service_td: accept zero-length TDs where CBP=BE+1 2024-06-21 16:20:45 +01:00
vfio vfio/container: Move vfio_container_destroy() to an instance_finalize() handler 2024-06-24 23:15:31 +02:00
virtio virtio-iommu: Remove the implementation of iommu_set_iova_range 2024-06-24 23:15:31 +02:00
watchdog aspeed/wdt: Add AST2700 support 2024-06-16 21:08:54 +02:00
xen xen-hvm: Avoid livelock while handling buffered ioreqs 2024-07-01 14:57:18 +02:00
xenpv hw/xen: Register framebuffer backend via xen_backend_init() 2024-06-04 11:53:43 +02:00
xtensa hw/xtensa: require libfdt 2024-05-10 15:45:15 +02:00
Kconfig hw: Fix problem with the A*MPCORE switches in the Kconfig files 2024-04-25 12:48:12 +02:00
meson.build hw/rdma: Remove deprecated pvrdma device and rdmacm-mux helper 2024-04-24 16:03:38 +02:00