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qemu/hw/ppc
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Nicholas Piggin 73d6ac24c8 hw/ppc: Fix clock update drift 
The clock update logic reads the clock twice to compute the new clock
value, with a value derived from the later time subtracted from a value
derived from the earlier time. The delta causes time to be lost.

This can ultimately result in time becoming unsynchronized between CPUs
and that can cause OS lockups, timeouts, watchdogs, etc. This can be
seen running a KVM guest (that causes lots of TB updates) on a powernv
SMP machine.

Fix this by reading the clock once.

Cc: qemu-stable@nongnu.org
Fixes: dbdd25065e ("Implement time-base start/stop helpers.")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Frederic Barrat <fbarrat@linux.ibm.com>
Message-ID: <20230629020713.327745-1-npiggin@gmail.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
(cherry picked from commit 2ad2e113de)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2023-07-17 14:23:05 +03:00
..
e500-ccsr.h
Use OBJECT_DECLARE_SIMPLE_TYPE when possible
2020-09-18 14:12:32 -04:00
e500.c
hw/ppc/e500.c: Attach eSDHC unimplemented region to ccsr_addr_space
2023-02-05 06:40:28 -03:00
e500.h
hw/ppc/e500: Add Freescale eSDHC to e500plat
2022-12-21 14:17:55 -03:00
e500plat.c
hw/ppc/e500{, plat}: Drop redundant checks for presence of platform bus
2023-02-05 06:40:28 -03:00
fdt.c
…
fw_cfg.c
hw/ppc: Implement fw_cfg_arch_key_name()
2019-05-23 14:10:31 +02:00
Kconfig
hw/ppc/Kconfig: Remove unused dependencies from PEGASOS2
2023-01-08 01:54:22 -05:00
mac_newworld.c
mac_{old,new}world: Use local variable instead of qdev_get_machine()
2023-02-06 11:41:39 +00:00
mac_oldworld.c
mac_oldworld: Allow specifying nvram backing store
2023-02-06 11:41:39 +00:00
meson.build
ppc440_uc.c: Move DDR2 SDRAM controller model to ppc4xx_sdram.c
2022-10-28 13:15:22 -03:00
mpc8544_guts.c
ppc/ppc4xx: Convert printfs()
2022-01-04 07:55:34 +01:00
mpc8544ds.c
hw/ppc/e500: Remove if statement which is now always true
2022-10-17 16:15:09 -03:00
pef.c
ppc/pef.c: initialize cgs->ready in kvmppc_svm_init()
2021-06-03 18:10:31 +10:00
pegasos2.c
hw/ppc/pegasos2: Fix PCI interrupt routing
2023-03-08 00:37:48 +01:00
pnv_bmc.c
Remove qemu-common.h include from most units
2022-04-06 14:31:55 +02:00
pnv_core.c
include/hw/ppc: Split pnv_chip.h off pnv.h
2023-01-20 07:25:10 +01:00
pnv_homer.c
include/hw/ppc: Split pnv_chip.h off pnv.h
2023-01-20 07:25:10 +01:00
pnv_lpc.c
hw/isa: Rename isa_bus_irqs() -> isa_bus_register_input_irqs()
2023-02-27 22:29:02 +01:00
pnv_occ.c
ppc/pnv: Remove PnvOCC::psi link
2022-04-20 18:00:30 -03:00
pnv_pnor.c
block: Change blk_{pread,pwrite}() param order
2022-07-12 12:14:56 +02:00
pnv_psi.c
include/hw/ppc: Don't include hw/pci-host/pnv_phb.h from pnv.h
2023-01-20 07:25:18 +01:00
pnv_sbe.c
ppc/pnv: Add initial P9/10 SBE model
2022-08-31 14:08:05 -03:00
pnv_xscom.c
include/hw/ppc: Split pnv_chip.h off pnv.h
2023-01-20 07:25:10 +01:00
pnv.c
pnv_phb4_pec: Simplify/align code to parent user-created PHBs
2023-03-03 16:50:17 -03:00
ppc4xx_devs.c
ppc4xx_sdram: Move ppc4xx_sdram_banks() to ppc4xx_sdram.c
2022-10-28 13:15:23 -03:00
ppc4xx_pci.c
include/hw/pci: Split pci_device.h off pci.h
2023-01-08 01:54:22 -05:00
ppc4xx_sdram.c
*: Add missing includes of qemu/error-report.h
2023-03-22 15:06:57 +00:00
ppc405_boards.c
ppc4xx_sdram: Rename functions to prevent name clashes
2022-10-17 16:15:09 -03:00
ppc405_uc.c
Drop duplicate #include
2023-02-08 07:28:05 +01:00
ppc405.h
ppc4xx_sdram: QOM'ify
2022-10-17 16:15:09 -03:00
ppc440_bamboo.c
Drop duplicate #include
2023-02-08 07:28:05 +01:00
ppc440_pcix.c
include/hw/pci: Split pci_device.h off pci.h
2023-01-08 01:54:22 -05:00
ppc440_uc.c
ppc440_uc.c: Move DDR2 SDRAM controller model to ppc4xx_sdram.c
2022-10-28 13:15:22 -03:00
ppc440.h
ppc440_sdram: QOM'ify
2022-10-17 16:15:09 -03:00
ppc_booke.c
Use g_new() & friends where that makes obvious sense
2022-03-21 15:44:44 +01:00
ppc.c
hw/ppc: Fix clock update drift
2023-07-17 14:23:05 +03:00
ppce500_spin.c
powerpc tcg: Fix Lesser GPL version number
2020-11-15 16:38:50 +01:00
prep_systemio.c
ppc/6xx: Allocate IRQ lines with qdev_init_gpio_in()
2022-07-18 13:59:43 -03:00
prep.c
hw/ppc/prep: Fix wiring of PIC -> CPU interrupt
2023-05-31 09:42:36 +03:00
rs6000_mc.c
Do not include hw/boards.h if it's not really necessary
2021-05-02 17:24:51 +02:00
sam460ex.c
hw/ppc/sam460ex: Correctly set MAL properties
2023-02-27 22:29:02 +01:00
spapr_caps.c
Trivial: 3 char repeat typos
2022-06-28 11:06:02 +02:00
spapr_cpu_core.c
hw/ppc: free env->tb_env in spapr_unrealize_vcpu()
2022-04-04 08:49:06 +02:00
spapr_drc.c
Drop duplicate #include
2023-02-08 07:28:05 +01:00
spapr_events.c
Use g_new() & friends where that makes obvious sense
2022-03-21 15:44:44 +01:00
spapr_hcall.c
includes: move tb_flush into its own header
2023-03-07 17:06:33 +00:00
spapr_iommu.c
spapr/ddw: Reset DMA when the last non-default window is removed
2022-07-06 10:22:37 -03:00
spapr_irq.c
spapr/xics: Drop unused argument to xics_kvm_has_broken_disconnect()
2020-12-14 15:50:55 +11:00
spapr_numa.c
Remove qemu-common.h include from most units
2022-04-06 14:31:55 +02:00
spapr_nvdimm.c
hw/ppc: check if spapr_drc_index() returns NULL in spapr_nvdimm.c
2022-07-28 10:31:54 -03:00
spapr_ovec.c
spapr: Improve handling of memory unplug with old guests
2021-01-19 10:20:29 +11:00
spapr_pci_nvlink2.c
hw/ppc/pnv: Avoid dynamic stack allocation
2022-09-22 16:38:28 +01:00
spapr_pci_vfio.c
include/hw/pci: Split pci_device.h off pci.h
2023-01-08 01:54:22 -05:00
spapr_pci.c
pci: drop redundant PCIDeviceClass::is_bridge field
2022-12-21 07:32:24 -05:00
spapr_rng.c
Do not include cpu.h if it's not really necessary
2021-05-02 17:24:51 +02:00
spapr_rtas_ddw.c
spapr/ddw: Implement 64bit query extension
2022-07-06 10:22:37 -03:00
spapr_rtas.c
target/ppc: introduce ppc_maybe_interrupt
2022-10-28 13:15:22 -03:00
spapr_rtc.c
rtc: Have event RTC_CHANGE identify the RTC by QOM path
2022-02-28 11:39:35 +01:00
spapr_softmmu.c
*: Add missing includes of qemu/error-report.h
2023-03-22 15:06:57 +00:00
spapr_tpm_proxy.c
Remove qemu-common.h include from most units
2022-04-06 14:31:55 +02:00
spapr_vio.c
hw/ppc/spapr_vio.c: use g_autofree in spapr_dt_vdevice()
2022-03-02 06:51:40 +01:00
spapr_vof.c
Remove qemu-common.h include from most units
2022-04-06 14:31:55 +02:00
spapr.c
Merge tag 'pull-ppc-20221221' of https://gitlab.com/danielhb/qemu into staging
2022-12-21 18:08:09 +00:00
trace-events
ppc4xx_sdram: Generalise bank setup
2022-10-28 13:15:23 -03:00
trace.h
trace: switch position of headers to what Meson requires
2020-08-21 06:18:24 -04:00
virtex_ml507.c
hw/ppc/virtex_ml507: Prefer local over global variable
2022-12-21 14:17:55 -03:00
vof.c
ppc/vof: Fix uninitialized string tracing
2022-04-20 18:00:30 -03:00