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xemu/hw/ppc
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Nicholas Piggin 2ad2e113de 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>
 		2023-07-07 04:18:26 -03:00
..
Kconfig hw/ppc/Kconfig: MAC_NEWWORLD should always select USB_OHCI_PCI 2023-06-10 10:19:24 -03:00
e500-ccsr.h Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
e500.c target/ppc: Restrict KVM-specific fields from ArchCPU 2023-06-28 14:27:59 +02:00
e500.h hw/ppc/e500: Add Freescale eSDHC to e500plat 2022-12-21 14:17:55 -03:00
e500plat.c hw/ppc: Use MachineClass->default_nic in the ppc machines 2023-05-22 09:44:22 +02:00
fdt.c target/ppc: Split page size information into a separate allocation 2018-04-27 18:05:22 +10:00
fw_cfg.c hw/ppc: Implement fw_cfg_arch_key_name() 2019-05-23 14:10:31 +02:00
mac_newworld.c hw/ppc: Use MachineClass->default_nic in the ppc machines 2023-05-22 09:44:22 +02:00
mac_oldworld.c hw/ppc: Use MachineClass->default_nic in the ppc machines 2023-05-22 09:44:22 +02:00
meson.build ppc/spapr: Move spapr nested HV to a new file 2023-06-25 22:41:30 +02:00
mpc8544_guts.c ppc/ppc4xx: Convert printfs() 2022-01-04 07:55:34 +01:00
mpc8544ds.c hw/ppc: Use MachineClass->default_nic in the ppc machines 2023-05-22 09:44:22 +02:00
pef.c ppc/pef.c: initialize cgs->ready in kvmppc_svm_init() 2021-06-03 18:10:31 +10:00
pegasos2.c ppc/pegasos2: Change default CPU to 7457 2023-05-28 13:25:45 -03:00
pnv.c ppc/pnv: Rephrase error when run with KVM 2023-06-25 22:41:30 +02:00
pnv_bmc.c Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
pnv_core.c target/ppc: Add POWER9 DD2.2 model 2023-05-28 13:25:11 -03:00
pnv_homer.c include/hw/ppc: Split pnv_chip.h off pnv.h 2023-01-20 07:25:10 +01:00
pnv_lpc.c bulk: Remove pointless QOM casts 2023-06-05 20:48:34 +02:00
pnv_occ.c bulk: Remove pointless QOM casts 2023-06-05 20:48:34 +02:00
pnv_pnor.c block: Change blk_{pread,pwrite}() param order 2022-07-12 12:14:56 +02:00
pnv_psi.c pnv/psi: Allow access to PSI registers through xscom 2023-07-07 04:18:26 -03:00
pnv_sbe.c bulk: Remove pointless QOM casts 2023-06-05 20:48:34 +02:00
pnv_xscom.c include/hw/ppc: Split pnv_chip.h off pnv.h 2023-01-20 07:25:10 +01:00
ppc.c hw/ppc: Fix clock update drift 2023-07-07 04:18:26 -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.h ppc4xx_sdram: QOM'ify 2022-10-17 16:15:09 -03:00
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
ppc440.h ppc440_sdram: QOM'ify 2022-10-17 16:15:09 -03:00
ppc440_bamboo.c ppc/bamboo: Report an error when run with KVM 2023-06-25 22:41:30 +02:00
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
ppc_booke.c Use g_new() & friends where that makes obvious sense 2022-03-21 15:44:44 +01:00
ppce500_spin.c target/ppc: Restrict KVM-specific fields from ArchCPU 2023-06-28 14:27:59 +02:00
prep.c ppc/prep: Report an error when run with KVM 2023-06-25 22:41:30 +02:00
prep_systemio.c ppc/6xx: Allocate IRQ lines with qdev_init_gpio_in() 2022-07-18 13:59:43 -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.c spapr: TCG allow up to 8-thread SMT on POWER8 and newer CPUs 2023-06-25 22:41:30 +02:00
spapr_caps.c spapr: TCG allow up to 8-thread SMT on POWER8 and newer CPUs 2023-06-25 22:41:30 +02:00
spapr_cpu_core.c spapr: TCG allow up to 8-thread SMT on POWER8 and newer CPUs 2023-06-25 22:41:30 +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 ppc/spapr: Move spapr nested HV to a new file 2023-06-25 22:41:30 +02:00
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_nested.c ppc/spapr: Move spapr nested HV to a new file 2023-06-25 22:41:30 +02:00
spapr_numa.c Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
spapr_nvdimm.c thread-pool: avoid passing the pool parameter every time 2023-04-25 13:17:28 +02:00
spapr_ovec.c spapr: Improve handling of memory unplug with old guests 2021-01-19 10:20:29 +11:00
spapr_pci.c pci: drop redundant PCIDeviceClass::is_bridge field 2022-12-21 07:32:24 -05:00
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_rng.c Do not include cpu.h if it's not really necessary 2021-05-02 17:24:51 +02:00
spapr_rtas.c softmmu/qtest: Move the target-specific pseries RTAS code out of qtest.c 2023-04-20 11:25:32 +02:00
spapr_rtas_ddw.c spapr/ddw: Implement 64bit query extension 2022-07-06 10:22:37 -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
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