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a6091108aa
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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
..
9pfs hw/9pfs/9p-synth: Replaced qemu_mutex_lock with QEMU_LOCK_GUARD 2021-03-16 11:41:49 +01:00
acpi acpi/piix4: reinitialize acpi PM device on reset 2021-04-01 12:19:52 -04:00
adc clock: Add ClockEvent parameter to callbacks 2021-03-08 17:20:01 +00:00
alpha vl: extract softmmu/datadir.c 2020-12-10 12:15:18 -05:00
arm hw: add compat machines for 6.1 2021-04-30 11:16:51 +01:00
audio hw: Replace anti-social QOM type names 2021-03-19 15:18:43 +01:00
avr hw/avr/arduino: List board schematic links 2021-03-15 00:39:52 +01:00
block hw/block/nvme: fix invalid msix exclusive uninit 2021-04-26 14:55:50 +01:00
char s390x: css: report errors from ccw_dstream_read/write 2021-04-09 10:52:13 +02:00
core hw/pci-host/gpex: Don't fault for unmapped parts of MMIO and PIO windows 2021-04-30 11:16:52 +01:00
cpu cpu/core: Fix "help" of CPU core device types 2021-04-09 16:05:16 -04:00
cris hw: Replace anti-social QOM type names 2021-03-19 15:18:43 +01:00
display hw/display/xlnx_dp: Free FIFOs adding xlnx_dp_finalize() 2021-03-30 14:05:33 +01:00
dma target-arm queue: 2021-03-10 13:57:31 +00:00
gpio hw: gpio: implement gpio-pwr driver for qemu reset/poweroff 2021-01-29 10:47:28 +00:00
hppa hw: Use the PCI_SLOT() macro from 'hw/pci/pci.h' 2021-01-04 23:24:44 +01:00
hyperv qdev: Move softmmu properties to qdev-properties-system.h 2020-12-18 15:20:17 -05:00
i2c hw/i2c/npcm7xx_smbus: Simplify npcm7xx_smbus_init() 2021-03-05 15:17:34 +00:00
i386 hw: add compat machines for 6.1 2021-04-30 11:16:51 +01:00
ide hw/ide: remove 'ide-drive' device 2021-03-18 09:22:55 +00:00
input Remove superfluous timer_del() calls 2021-01-08 15:13:38 +00:00
intc * fixes for i386 TCG paging 2021-03-19 18:01:17 +00:00
ipack Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
ipmi Remove superfluous timer_del() calls 2021-01-08 15:13:38 +00:00
isa hw/isa/piix4: Migrate Reset Control Register 2021-04-13 12:06:59 +02:00
lm32 hw/lm32/Kconfig: Have MILKYMIST select LM32_DEVICES 2021-03-09 22:37:08 +01:00
m68k m68k: add Virtual M68k Machine 2021-03-15 21:03:06 +01:00
mem memory: add a sparse memory device for fuzzing 2021-03-16 14:30:30 -04:00
microblaze hw: Replace anti-social QOM type names 2021-03-19 15:18:43 +01:00
mips hw/mips/gt64xxx: Trace accesses to ISD registers 2021-03-13 20:29:36 +01:00
misc hw: Replace anti-social QOM type names 2021-03-19 15:18:43 +01:00
moxie moxie: do not use ram_size global 2020-12-10 12:15:08 -05:00
net Revert "net: Move NetClientState.info_str to dynamic allocations" 2021-04-08 17:33:59 +08:00
nios2 * New -action option and set-action QMP command (Alejandro) 2020-12-15 21:24:31 +00:00
nubus
nvram sysemu: Let VMChangeStateHandler take boolean 'running' argument 2021-03-09 23:13:57 +01:00
openrisc target/openrisc: Move pic_cpu code into CPU object proper 2020-12-15 12:04:30 +00:00
pci virtio-pci: compat page aligned ATS 2021-04-06 07:11:36 -04:00
pci-bridge Kconfig: Compile PXB for ARM_VIRT 2021-01-17 06:42:54 -05:00
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
pcmcia pxa2xx: Move QOM macros to header 2020-08-27 14:04:55 -04:00
ppc hw: add compat machines for 6.1 2021-04-30 11:16:51 +01:00
rdma pvrdma: wean code off pvrdma_ring.h kernel header 2021-03-15 16:41:22 +08:00
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 goldfish_rtc: re-arm the alarm after migration 2021-03-04 09:43:29 -05:00
rx qtest: delete superfluous inclusions of qtest.h 2021-03-09 06:03:53 +01:00
s390x hw: add compat machines for 6.1 2021-04-30 11:16:51 +01:00
scsi mptsas: Remove unused MPTSASState 'pending' field (CVE-2021-3392) 2021-04-19 15:48:12 +01:00
sd hw/sd: sdhci: Reset the data pointer of s->fifo_buffer[] when a different block size is programmed 2021-03-22 16:56:22 +01:00
sh4 hw/sh4/sh7750_regs: Replace link to license by its full content 2021-03-06 16:19:03 +01:00
smbios i386: do not use ram_size global 2020-12-10 12:15:08 -05:00
sparc hw: Replace anti-social QOM type names 2021-03-19 15:18:43 +01:00
sparc64 hw/ide: remove 'ide-drive' device 2021-03-18 09:22:55 +00:00
ssi hw/ssi: xilinx_spips: Remove DMA related dead codes from zynqmp_spips 2021-03-10 13:54:51 +00:00
timer hw/timer/renesas_tmr: Add default-case asserts in read_tcnt() 2021-03-30 14:05:34 +01:00
tpm tpm: put some tpm devices into the correct category 2021-02-20 12:36:19 +01:00
tricore tricore: added triboard with tc27x_soc 2021-03-14 14:41:55 +01:00
unicore32
usb hw/usb/hcd-ehci: Fix crash when showing help of EHCI devices 2021-03-26 11:10:49 +01:00
vfio vfio/migrate: Move switch of dirty tracking into vfio_memory_listener 2021-03-16 10:06:44 -06:00
virtio vhost-user-fs: fix features handling 2021-04-13 16:13:41 +01:00
watchdog clock: Add ClockEvent parameter to callbacks 2021-03-08 17:20:01 +00:00
xen pci: add romsize property 2021-02-05 08:52:58 -05:00
xenpv
xtensa vl: make qemu_get_machine_opts static 2020-12-15 12:51:55 -05:00
Kconfig semihosting: Move hw/semihosting/ -> semihosting/ 2021-03-10 15:34:12 +00:00
meson.build semihosting: Move hw/semihosting/ -> semihosting/ 2021-03-10 15:34:12 +00:00