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qemu-patch-raspberry4/include/hw
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David Hildenbrand 09b3b7e092 virtio-mem: Support "prealloc=on" option 
For scarce memory resources, such as hugetlb, we want to be able to
prealloc such memory resources in order to not crash later on access. On
simple user errors we could otherwise easily run out of memory resources
an crash the VM -- pretty much undesired.

For ordinary memory devices, such as DIMMs, we preallocate memory via the
memory backend for such use cases; however, with virtio-mem we're dealing
with sparse memory backends; preallocating the whole memory backend
destroys the whole purpose of virtio-mem.

Instead, we want to preallocate memory when actually exposing memory to the
VM dynamically, and fail plugging memory gracefully + warn the user in case
preallocation fails.

A common use case for hugetlb will be using "reserve=off,prealloc=off" for
the memory backend and "prealloc=on" for the virtio-mem device. This
way, no huge pages will be reserved for the process, but we can recover
if there are no actual huge pages when plugging memory. Libvirt is
already prepared for this.

Note that preallocation cannot protect from the OOM killer -- which
holds true for any kind of preallocation in QEMU. It's primarily useful
only for scarce memory resources such as hugetlb, or shared file-backed
memory. It's of little use for ordinary anonymous memory that can be
swapped, KSM merged, ... but we won't forbid it.

Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20211217134611.31172-9-david@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2022-01-07 19:30:13 -05:00
..
acpi hw/acpi/ich9: Add compat prop to keep HPC bit set for 6.1 machine type 2021-11-15 09:44:46 -05:00
adc hw/adc: Add basic Aspeed ADC model 2021-10-12 08:20:08 +02:00
arm hw/arm: Add Nuvoton SD module to board 2021-11-02 14:14:55 -04:00
audio qom: Put name parameter before value / visitor parameter 2020-07-10 15:18:08 +02:00
block block: Add backend_defaults property 2021-07-06 14:28:55 +01:00
char hw/m68k: Fix typo in SPDX tag 2021-11-09 10:11:27 +01:00
core - Split out host signal handing from accel/tcg/user-exec.c 2021-11-02 13:44:53 -04:00
cpu Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
cris hw: Replace anti-social QOM type names 2021-03-19 15:18:43 +01:00
display macfb: add vertical blank interrupt 2021-10-08 13:31:03 +02:00
dma hw/dma/xlnx-zdma Always expect 'dma' link property to be set 2021-08-26 17:01:59 +01:00
firmware hw/smbios: Use qapi for SmbiosEntryPointType 2022-01-07 05:19:55 -05:00
gpio hw: aspeed_gpio: Fix GPIO array indexing 2021-10-12 08:20:08 +02:00
hyperv Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
i2c aspeed/i2c: QOMify AspeedI2CBus 2021-10-12 08:20:08 +02:00
i386 hw/i386: expose a "smbios-entry-point-type" PC machine property 2022-01-07 05:19:55 -05:00
ide ide: Rename ide_bus_new() to ide_bus_init() 2021-09-30 13:44:13 +01:00
input hw/input/lm832x: Define TYPE_LM8323 in public header 2021-07-08 14:15:01 -05:00
intc hw/intc/arm_gicv3: Support multiple redistributor regions 2021-11-15 16:12:59 +00:00
ipack ipack: Rename ipack_bus_new_inplace() to ipack_bus_init() 2021-09-30 13:42:10 +01:00
ipmi Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
isa vt82c686: Add a method to VIA_ISA to raise ISA interrupts 2021-10-18 00:41:36 +02:00
kvm target/i386: always create kvmclock device 2020-09-30 19:11:36 +02:00
m68k hw/m68k/next-cube: Add missing header comment to next-cube.h 2021-01-19 09:11:52 +01:00
mem pc-dimm: remove unnecessary get_vmstate_memory_region() method 2021-05-14 10:26:18 -04:00
mips hw/mips: Add a bootloader helper 2021-02-21 18:41:04 +01:00
misc hw/m68k: Fix typo in SPDX tag 2021-11-09 10:11:27 +01:00
net hw/net: Add npcm7xx emc model 2021-03-05 15:17:34 +00:00
nubus nubus: add support for slot IRQs 2021-09-29 10:45:19 +02:00
nvram hw/nvram: Introduce Xilinx battery-backed ram 2021-09-30 13:42:10 +01:00
pci pci: Export the pci_intx() function 2022-01-07 05:19:55 -05:00
pci-bridge Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
pci-host ppc/pnv: Remove the PHB4 "device-id" property 2022-01-04 07:55:34 +01:00
ppc dma: Let ld*_dma() propagate MemTxResult 2021-12-31 01:05:27 +01:00
rdma qapi: introduce x-query-rdma QMP command 2021-11-02 15:55:14 +00:00
remote multi-process: perform device reset in the remote process 2021-02-10 09:23:28 +00:00
riscv hw/riscv: microchip_pfsoc: Use the PLIC config helper function 2021-10-28 14:39:23 +10:00
rtc m48t59: remove legacy m48t59_init() function 2020-10-18 16:21:42 +01:00
rx Use DECLARE_*CHECKER* macros 2020-09-09 09:27:09 -04:00
s390x s390x/pci: add supported DT information to clp response 2021-12-17 09:12:37 +01:00
scsi hw/scsi: Fix scsi_bus_init_named() docstring 2021-12-18 10:57:36 +01:00
sd hw/sd: add nuvoton MMC 2021-11-02 14:14:55 -04:00
sensor sensor: Move hardware sensors from misc to a sensor directory 2021-06-17 07:10:32 -05:00
sh4 hw/intc/sh_intc: Inline and drop sh_intc_source() function 2021-10-30 18:39:37 +02:00
southbridge Use DECLARE_*CHECKER* macros 2020-09-09 09:27:09 -04:00
sparc hw: Replace anti-social QOM type names 2021-03-19 15:18:43 +01:00
ssi aspeed/smc: Use a container for the flash mmio address space 2021-10-22 09:52:17 +02:00
timer hw/timer: Add SiFive PWM support 2021-09-21 07:56:49 +10:00
tricore hw/tricore: Add testdevice for tests in tests/tcg/ 2021-05-18 09:36:21 +01:00
usb usb-storage: tag usb_msd_csw as packed struct 2021-11-02 17:24:18 +01:00
vfio vfio: Query and store the maximum number of possible DMA mappings 2021-07-08 15:54:45 -04:00
virtio virtio-mem: Support "prealloc=on" option 2022-01-07 19:30:13 -05:00
watchdog watchdog: aspeed: Sanitize control register values 2021-09-20 08:50:59 +02:00
xen xen: Free xenforeignmemory_resource at exit 2021-05-10 13:43:58 +01:00
xtensa Include hw/irq.h a lot less 2019-08-16 13:31:52 +02:00
boards.h hw: Add compat machines for 7.0 2022-01-05 09:06:36 +01:00
clock.h host-utils: add 128-bit quotient support to divu128/divs128 2021-10-27 17:10:00 -07:00
elf_ops.h hw/elf_ops.h: switch to ssize_t for elf loader return type 2021-10-20 16:26:19 -07:00
fw-path-provider.h Use DECLARE_*CHECKER* macros 2020-09-09 09:27:09 -04:00
hotplug.h Use DECLARE_*CHECKER* macros 2020-09-09 09:27:09 -04:00
hw.h Include hw/hw.h exactly where needed 2019-08-16 13:31:52 +02:00
ide.h hw/ide: Move MAX_IDE_DEVS define to hw/ide/internal.h 2020-03-17 12:22:36 -04:00
irq.h include/hw/irq.h: New function qemu_irq_is_connected() 2020-08-03 17:55:03 +01:00
loader-fit.h nomaintainer: Fix Lesser GPL version number 2020-11-15 17:04:40 +01:00
loader.h hw/elf_ops.h: switch to ssize_t for elf loader return type 2021-10-20 16:26:19 -07:00
nmi.h Use DECLARE_*CHECKER* macros 2020-09-09 09:27:09 -04:00
or-irq.h Use DECLARE_*CHECKER* macros 2020-09-09 09:27:09 -04:00
pcmcia.h Use OBJECT_DECLARE_TYPE when possible 2020-09-18 14:12:32 -04:00
platform-bus.h nomaintainer: Fix Lesser GPL version number 2020-11-15 17:04:40 +01:00
ptimer.h ptimer: Add new ptimer_set_period_from_clock() function 2021-01-29 15:54:42 +00:00
qdev-clock.h clock: Add ClockEvent parameter to callbacks 2021-03-08 17:20:01 +00:00
qdev-core.h hw/qdev: Rename qdev_connect_gpio_out*() 'input_pin' parameter 2021-12-31 13:21:36 +01:00
qdev-dma.h Supply missing header guards 2019-06-12 13:20:21 +02:00
qdev-properties-system.h qdev: Reuse DEFINE_PROP in all DEFINE_PROP_* macros 2020-12-18 15:20:17 -05:00
qdev-properties.h qdev-properties: PropertyInfo: add realized_set_allowed field 2021-09-01 12:57:31 +02:00
register.h hw/core/register: Add more 64-bit utilities 2021-09-01 11:59:12 +10:00
registerfields.h hw/registerfields: Use 64-bit bitfield for FIELD_DP64 2021-09-01 11:59:12 +10:00
resettable.h Use DECLARE_*CHECKER* macros 2020-09-09 09:27:09 -04:00
stream.h hw/core/stream: Rename StreamSlave as StreamSink 2020-12-10 12:15:04 -05:00
sysbus.h qom: Remove module_obj_name parameter from OBJECT_DECLARE* macros 2020-09-18 14:12:32 -04:00
usb.h usb: drop usb_host_dev_is_scsi_storage hook 2021-07-09 18:21:33 +02:00
vmstate-if.h Use DECLARE_*CHECKER* macros 2020-09-09 09:27:09 -04:00