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Nicholas Piggin 09d2db9f46 target/ppc: Fix decrementer time underflow and infinite timer loop 
It is possible to store a very large value to the decrementer that it
does not raise the decrementer exception so the timer is scheduled, but
the next time value wraps and is treated as in the past.

This can occur if (u64)-1 is stored on a zero-triggered exception, or
(u64)-1 is stored twice on an underflow-triggered exception, for
example.

If such a value is set in DECAR, it gets stored to the decrementer by
the timer function, which then immediately causes another timer, which
hangs QEMU.

Clamp the decrementer to the implemented width, and use that as the
value for the timer calculation, effectively preventing this overflow.

Reported-by: sdicaro@DDCI.com
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Message-Id: <20230530131214.373524-1-npiggin@gmail.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
 		2023-06-10 10:19:24 -03:00
..
Kconfig hw/ppc/Kconfig: NVDIMM is a hard requirement for the pseries machine 2023-05-05 12:34:22 -03:00
e500-ccsr.h Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
e500.c hw/ppc: Use MachineClass->default_nic in the ppc machines 2023-05-22 09:44:22 +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 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: 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 target/ppc: Add POWER9 DD2.2 model 2023-05-28 13:25:11 -03:00
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 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 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 target/ppc: Fix decrementer time underflow and infinite timer loop 2023-06-10 10:19:24 -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 hw/ppc: Use MachineClass->default_nic in the ppc machines 2023-05-22 09:44:22 +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 powerpc tcg: Fix Lesser GPL version number 2020-11-15 16:38:50 +01:00
prep.c hw/ppc/prep: Fix wiring of PIC -> CPU interrupt 2023-05-28 07:13:54 -03:00
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 target/ppc: Add POWER9 DD2.2 model 2023-05-28 13:25:11 -03:00
spapr_caps.c spapr: Add SPAPR_CAP_AIL_MODE_3 for AIL mode 3 support for H_SET_MODE hcall 2023-05-28 07:13:54 -03:00
spapr_cpu_core.c target/ppc: Add POWER9 DD2.2 model 2023-05-28 13:25:11 -03:00
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 spapr: Add SPAPR_CAP_AIL_MODE_3 for AIL mode 3 support for H_SET_MODE hcall 2023-05-28 07:13:54 -03:00
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 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