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qemu-patch-raspberry4/hw
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Paolo Bonzini 33f21e4f04 mc146818rtc: implement UIP latching as intended 
In some cases, the guest can observe the wrong ordering of UIP and
interrupts.  This can happen if the VCPU exit is timed like this:

           iothread                 VCPU
                                  ... wait for interrupt ...
t-100ns                           read register A
t          wake up, take BQL
t+100ns                             update_in_progress
                                      return false
                                    return UIP=0
           trigger interrupt

The interrupt is late; the VCPU expected the falling edge of UIP to
happen after the interrupt.  update_in_progress is already trying to
cover this case by latching UIP if the timer is going to fire soon,
and the fix is documented in the commit message for commit 56038ef623
("RTC: Update the RTC clock only when reading it", 2012-09-10).  It
cannot be tested with qtest, because its timing of interrupts vs. reads
is exact.

However, the implementation was incorrect because UIP cmos_ioport_read
cleared register A instead of leaving that to rtc_update_timer.  Fixing
the implementation of cmos_ioport_read to match the commit message,
however, breaks the "uip-stuck" test case from the previous patch.
To fix it, skip update timer optimizations if UIP has been latched.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-08-01 17:27:34 +02:00
..
9pfs docs: fix broken paths to docs/devel/tracing.txt 2017-07-31 13:12:53 +03:00
acpi docs: fix broken paths to docs/devel/tracing.txt 2017-07-31 13:12:53 +03:00
adc STM32F2xx: Add the ADC device 2016-10-04 13:28:07 +01:00
alpha docs: fix broken paths to docs/devel/tracing.txt 2017-07-31 13:12:53 +03:00
arm docs: fix broken paths to docs/devel/tracing.txt 2017-07-31 13:12:53 +03:00
audio trace-events: fix code style: print 0x before hex numbers 2017-08-01 12:13:07 +01:00
block docs: fix broken paths to docs/devel/tracing.txt 2017-07-31 13:12:53 +03:00
bt bt: stop the sdp memory allocation craziness 2017-08-01 17:27:33 +02:00
char trace-events: fix code style: print 0x before hex numbers 2017-08-01 12:13:07 +01:00
core loader: check get_image_size() return value 2017-07-31 13:06:38 +03:00
cpu hw/cpu: core.c can be compiled as common object 2017-06-09 12:02:55 +10:00
cris hw: Use new memory_region_init_{ram, rom, rom_device}() functions 2017-07-14 17:59:42 +01:00
display trace-events: fix code style: print 0x before hex numbers 2017-08-01 12:13:07 +01:00
dma trace-events: fix code style: print 0x before hex numbers 2017-08-01 12:13:07 +01:00
gpio qdev: Replace cannot_instantiate_with_device_add_yet with !user_creatable 2017-05-17 10:37:00 -03:00
i2c migration/next for 20170601 2017-06-02 14:07:53 +01:00
i386 trace-events: fix code style: print 0x before hex numbers 2017-08-01 12:13:07 +01:00
ide -----BEGIN PGP SIGNATURE----- 2017-07-19 13:43:58 +01:00
input trace-events: fix code style: print 0x before hex numbers 2017-08-01 12:13:07 +01:00
intc trace-events: fix code style: print 0x before hex numbers 2017-08-01 12:13:07 +01:00
ipack ipack: Update e-mail address 2016-05-18 15:04:27 +03:00
ipmi qom: enforce readonly nature of link's check callback 2017-07-14 12:04:42 +02:00
isa trace-events: fix code style: print 0x before hex numbers 2017-08-01 12:13:07 +01:00
lm32 char: rename CharDriverState Chardev 2017-01-27 18:07:59 +01:00
m68k hw: Use new memory_region_init_{ram, rom, rom_device}() functions 2017-07-14 17:59:42 +01:00
mem docs: fix broken paths to docs/devel/tracing.txt 2017-07-31 13:12:53 +03:00
microblaze hw: Use new memory_region_init_{ram, rom, rom_device}() functions 2017-07-14 17:59:42 +01:00
mips hw/mips: load_elf_strerror to report kernel loading failure 2017-07-28 13:32:32 +01:00
misc trace-events: fix code style: print 0x before hex numbers 2017-08-01 12:13:07 +01:00
moxie hw: Use new memory_region_init_{ram, rom, rom_device}() functions 2017-07-14 17:59:42 +01:00
net trace-events: fix code style: print 0x before hex numbers 2017-08-01 12:13:07 +01:00
nios2 hw: Use new memory_region_init_{ram, rom, rom_device}() functions 2017-07-14 17:59:42 +01:00
nvram trace-events: fix code style: print 0x before hex numbers 2017-08-01 12:13:07 +01:00
openrisc hw: Use new memory_region_init_{ram, rom, rom_device}() functions 2017-07-14 17:59:42 +01:00
pci trace-events: fix code style: %# -> 0x% 2017-08-01 12:13:07 +01:00
pci-bridge pci: Convert shpc_init() to Error 2017-07-03 22:29:49 +03:00
pci-host memory: Rename memory_region_init_ram() to memory_region_init_ram_nomigrate() 2017-07-14 17:59:42 +01:00
pcmcia hw: Clean up includes 2016-01-29 15:07:25 +00:00
ppc trace-events: fix code style: print 0x before hex numbers 2017-08-01 12:13:07 +01:00
s390x trace-events: fix code style: print 0x before hex numbers 2017-08-01 12:13:07 +01:00
scsi hw/scsi/vmw_pvscsi: Convert to realize 2017-08-01 17:27:33 +02:00
sd trace-events: fix code style: print 0x before hex numbers 2017-08-01 12:13:07 +01:00
sh4 hw: Use new memory_region_init_{ram, rom, rom_device}() functions 2017-07-14 17:59:42 +01:00
smbios stubs: move smbios stubs to hw/smbios 2017-01-16 17:52:35 +01:00
sparc docs: fix broken paths to docs/devel/tracing.txt 2017-07-31 13:12:53 +03:00
sparc64 memory: Rename memory_region_init_ram() to memory_region_init_ram_nomigrate() 2017-07-14 17:59:42 +01:00
ssi xilinx_spips: allow mmio execution 2017-06-27 15:09:15 +02:00
timer mc146818rtc: implement UIP latching as intended 2017-08-01 17:27:34 +02:00
tpm clean-up: removed duplicate #includes 2016-10-28 18:17:24 +03:00
tricore hw: Use new memory_region_init_{ram, rom, rom_device}() functions 2017-07-14 17:59:42 +01:00
unicore32 fix qemu-system-unicore32 crashing when calling without -kernel 2017-07-31 13:05:49 +03:00
usb trace-events: fix code style: print 0x before hex numbers 2017-08-01 12:13:07 +01:00
vfio trace-events: fix code style: print 0x before hex numbers 2017-08-01 12:13:07 +01:00
virtio trace-events: fix code style: print 0x before hex numbers 2017-08-01 12:13:07 +01:00
watchdog shutdown: Add source information to SHUTDOWN and RESET 2017-05-23 13:28:17 +02:00
xen trace-events: fix code style: %# -> 0x% 2017-08-01 12:13:07 +01:00
xenpv xenfb: remove xen_init_display "temporary" hack 2017-07-07 11:10:03 -07:00
xtensa hw: Use new memory_region_init_{ram, rom, rom_device}() functions 2017-07-14 17:59:42 +01:00
Makefile.objs acpi: filter based on CONFIG_ACPI_X86 rather than TARGET 2017-01-16 17:52:35 +01:00