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qemu/include/hw
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Peter Maydell a6091108aa hw/pci-host/gpex: Don't fault for unmapped parts of MMIO and PIO windows 
Currently the gpex PCI controller implements no special behaviour for
guest accesses to areas of the PIO and MMIO where it has not mapped
any PCI devices, which means that for Arm you end up with a CPU
exception due to a data abort.

Most host OSes expect "like an x86 PC" behaviour, where bad accesses
like this return -1 for reads and ignore writes.  In the interests of
not being surprising, make host CPU accesses to these windows behave
as -1/discard where there's no mapped PCI device.

The old behaviour generally didn't cause any problems, because
almost always the guest OS will map the PCI devices and then only
access where it has mapped them. One corner case where you will see
this kind of access is if Linux attempts to probe legacy ISA
devices via a PIO window access. So far the only case where we've
seen this has been via the syzkaller fuzzer.

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Message-id: 20210325163315.27724-1-peter.maydell@linaro.org
Fixes: https://bugs.launchpad.net/qemu/+bug/1918917
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2021-04-30 11:16:52 +01:00
..
acpi acpi: Move maximum size logic into acpi_add_rom_blob() 2021-03-22 18:58:19 -04:00
adc hw/adc: Add an ADC module for NPCM7XX 2021-01-12 21:19:02 +00:00
arm hw: Replace anti-social QOM type names 2021-03-19 15:18:43 +01:00
audio qom: Put name parameter before value / visitor parameter 2020-07-10 15:18:08 +02:00
block qdev: Move softmmu properties to qdev-properties-system.h 2020-12-18 15:20:17 -05:00
char target-arm queue: 2021-03-23 21:15:17 +00:00
core accel/tcg: Precompute curr_cflags into cpu->tcg_cflags 2021-03-06 11:53:57 -08:00
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 Clean up includes 2020-12-10 17:16:44 +01:00
dma hw/dma: Implement a Xilinx CSU DMA model 2021-03-08 17:20:04 +00:00
firmware
gpio hw/gpio: Add GPIO model for Nuvoton NPCM7xx 2020-10-27 11:10:32 +00:00
hyperv Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
i2c hw/i2c: Implement NPCM7XX SMBus Module FIFO Mode 2021-02-16 14:12:54 +00:00
i386 hw: add compat machines for 6.1 2021-04-30 11:16:51 +01:00
ide nomaintainer: Fix Lesser GPL version number 2020-11-15 17:04:40 +01:00
input input: tsc2xxx fix. 2020-09-22 21:11:10 +01:00
intc m68k: add an interrupt controller 2021-03-15 21:02:20 +01:00
ipack Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
ipmi Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
isa vt82c686: Make vt82c686b-pm an abstract base class and add vt8231-pm based on it 2021-02-21 19:42:34 +01:00
kvm target/i386: always create kvmclock device 2020-09-30 19:11:36 +02:00
lm32
m68k hw/m68k/next-cube: Add missing header comment to next-cube.h 2021-01-19 09:11:52 +01:00
mem memory: add a sparse memory device for fuzzing 2021-03-16 14:30:30 -04:00
mips hw/mips: Add a bootloader helper 2021-02-21 18:41:04 +01:00
misc hw: Replace anti-social QOM type names 2021-03-19 15:18:43 +01:00
net hw/net: Add npcm7xx emc model 2021-03-05 15:17:34 +00:00
nubus Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
nvram fw_cfg: Refactor extra pci roots addition 2020-12-08 13:48:57 -05:00
pci virtio-pci: compat page aligned ATS 2021-04-06 07:11:36 -04:00
pci-bridge Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
pci-host hw/pci-host/gpex: Don't fault for unmapped parts of MMIO and PIO windows 2021-04-30 11:16:52 +01:00
ppc spapr: rollback 'unplug timeout' for CPU hotunplugs 2021-04-12 12:27:14 +10:00
rdma Use DECLARE_*CHECKER* macros 2020-09-09 09:27:09 -04:00
remote multi-process: perform device reset in the remote process 2021-02-10 09:23:28 +00:00
riscv hw/riscv: microchip_pfsoc: Map EMMC/SD mux register 2021-03-22 21:54:40 -04:00
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: move S390_ADAPTER_SUPPRESSIBLE 2021-03-26 09:33:50 +01:00
scsi esp: fix setting of ESPState mig_version_id when launching QEMU with -S option 2021-04-12 22:31:24 +01:00
sd Pull request trivial patches 20210220 2021-02-21 12:12:18 +00:00
sh4 hw/sh4: Add missing license 2021-03-06 16:18:42 +01:00
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 hw/ssi: xilinx_spips: Remove DMA related dead codes from zynqmp_spips 2021-03-10 13:54:51 +00:00
timer hw/timer/sse-timer: Model the SSE Subsystem System Timer 2021-03-08 17:20:01 +00:00
tricore tricore: added triboard with tc27x_soc 2021-03-14 14:41:55 +01:00
unicore32
usb usb/storage: move declarations to usb/msd.h header 2021-03-15 17:01:12 +01:00
vfio vfio: Change default dirty pages tracking behavior during migration 2020-11-23 10:05:58 -07:00
virtio virtio-blk: Respect discard granularity 2021-03-15 09:48:53 +00:00
watchdog arm: Remove frq properties on CMSDK timer, dualtimer, watchdog, ARMSSE 2021-01-29 15:54:44 +00:00
xen xen: remove GNUC check 2020-12-15 12:53:13 -05:00
xtensa
boards.h hw: add compat machines for 6.1 2021-04-30 11:16:51 +01:00
clock.h clock: Add clock_ns_to_ticks() function 2021-03-08 17:20:01 +00:00
elf_ops.h hw/elf_ops: Fix a typo 2021-03-09 21:27:51 +01:00
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
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/core/loader: Add new function rom_ptr_for_as() 2021-03-23 11:47:31 +00:00
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 machine: introduce MachineInitPhase 2020-12-15 12:51:52 -05:00
qdev-dma.h
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: Rename qdev_get_prop_ptr() to object_field_prop_ptr() 2020-12-18 15:20:18 -05:00
register.h hw: Replace anti-social QOM type names 2021-03-19 15:18:43 +01:00
registerfields.h hw/registerfields: Prefix local variables with underscore in macros 2020-05-27 11:23:07 -07:00
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: remove support for -usbdevice parameters 2021-03-15 17:00:58 +01:00
vmstate-if.h Use DECLARE_*CHECKER* macros 2020-09-09 09:27:09 -04:00