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qemu/hw/intc
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Frederic Barrat f657721187 ppc/xive: Update the state of the External interrupt signal 
When pulling or pushing an OS context from/to a CPU, we should
re-evaluate the state of the External interrupt signal. Otherwise, we
can end up catching the External interrupt exception in hypervisor
mode, which is unexpected.

The problem is best illustrated with the following scenario:

1. an External interrupt is raised while the guest is on the CPU.

2. before the guest can ack the External interrupt, an hypervisor
interrupt is raised, for example the Hypervisor Decrementer or
Hypervisor Virtualization interrupt. The hypervisor interrupt forces
the guest to exit while the External interrupt is still pending.

3. the hypervisor handles the hypervisor interrupt. At this point, the
External interrupt is still pending. So it's very likely to be
delivered while the hypervisor is running. That's unexpected and can
result in an infinite loop where the hypervisor catches the External
interrupt, looks for an interrupt in its hypervisor queue, doesn't
find any, exits the interrupt handler with the External interrupt
still raised, repeat...

The fix is simply to always lower the External interrupt signal when
pulling an OS context. It means it needs to be raised again when
re-pushing the OS context. Fortunately, it's already the case, as we
now always call xive_tctx_ipb_update(), which will raise the signal if
needed.

Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
Message-Id: <20220429071620.177142-3-fbarrat@linux.ibm.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
2022-05-05 15:36:17 -03:00
..
allwinner-a10-pic.c Clean up inclusion of sysemu/sysemu.h 2019-08-16 13:31:53 +02:00
apic_common.c Do not include cpu.h if it's not really necessary 2021-05-02 17:24:51 +02:00
apic.c Do not include cpu.h if it's not really necessary 2021-05-02 17:24:51 +02:00
arm_gic_common.c arm_gic: Mask the un-supported priority bits 2020-02-28 16:14:57 +00:00
arm_gic_kvm.c Do not include cpu.h if it's not really necessary 2021-05-02 17:24:51 +02:00
arm_gic.c hw/intc/arm_gic: Allow reset of the running priority 2022-01-20 11:47:52 +00:00
arm_gicv2m.c arm tcg cpus: Fix Lesser GPL version number 2020-11-15 16:42:14 +01:00
arm_gicv3_common.c hw/intc/arm_gicv3: Allow 'revision' property to be set to 4 2022-04-22 14:44:53 +01:00
arm_gicv3_cpuif_common.c hw/intc/arm_gicv3: Extract gicv3_set_gicv3state from arm_gicv3_cpuif.c 2021-12-15 10:11:34 +00:00
arm_gicv3_cpuif.c target/arm: Replace sentinels with ARRAY_SIZE in cpregs.h 2022-05-05 09:35:50 +01:00
arm_gicv3_dist.c hw/intc/arm_gicv3: Update ID and feature registers for GICv4 2022-04-22 14:44:53 +01:00
arm_gicv3_its_common.c hw/intc/arm_gicv3_its: Revert version increments in vmstate_its 2021-11-22 18:17:19 +00:00
arm_gicv3_its_kvm.c hw/intc/arm_gicv3: Keep pointers to every connected ITS 2022-04-22 09:24:44 +01:00
arm_gicv3_its.c hw/intc/arm_gicv3: Update ID and feature registers for GICv4 2022-04-22 14:44:53 +01:00
arm_gicv3_kvm.c target/arm: Replace sentinels with ARRAY_SIZE in cpregs.h 2022-05-05 09:35:50 +01:00
arm_gicv3_redist.c hw/intc/arm_gicv3: Update ID and feature registers for GICv4 2022-04-22 14:44:53 +01:00
arm_gicv3.c hw/intc/arm_gicv3: Specify valid and impl in MemoryRegionOps 2022-03-07 13:16:50 +00:00
armv7m_nvic.c arm: Move system PPB container handling to armv7m 2021-09-01 11:08:18 +01:00
aspeed_vic.c Include migration/vmstate.h less 2019-08-16 13:31:52 +02:00
bcm2835_ic.c Mark remaining global TypeInfo instances as const 2022-02-21 13:30:20 +00:00
bcm2836_control.c Mark remaining global TypeInfo instances as const 2022-02-21 13:30:20 +00:00
etraxfs_pic.c hw: Replace anti-social QOM type names 2021-03-19 15:18:43 +01:00
exynos4210_combiner.c hw/arm/exynos4210: Put combiners into state struct 2022-04-21 11:37:04 +01:00
exynos4210_gic.c Misc cleanups 2022-04-21 09:27:54 -07:00
gic_internal.h hw/intc/arm_gic: Drop GIC_BASE_IRQ macro 2018-09-25 15:13:24 +01:00
gicv3_internal.h hw/intc/arm_gicv3: Update ID and feature registers for GICv4 2022-04-22 14:44:53 +01:00
goldfish_pic.c hw/m68k: Fix typo in SPDX tag 2021-11-09 10:11:27 +01:00
grlib_irqmp.c Do not include cpu.h if it's not really necessary 2021-05-02 17:24:51 +02:00
heathrow_pic.c Include hw/hw.h exactly where needed 2019-08-16 13:31:52 +02:00
i8259_common.c intc: Unexport InterruptStatsProviderClass-related functions 2022-01-27 12:08:50 +01:00
i8259.c hw/intc/i8259: Refactor pic_read_irq() to avoid uninitialized variable 2021-03-19 08:48:18 -04:00
imx_avic.c Include migration/vmstate.h less 2019-08-16 13:31:52 +02:00
imx_gpcv2.c hw: Do not include qemu/log.h if it is not necessary 2021-05-02 17:24:50 +02:00
intc.c intc: add an interface to gather statistics/informations on interrupt controllers 2016-10-04 10:00:25 +02:00
ioapic_common.c intc: Unexport InterruptStatsProviderClass-related functions 2022-01-27 12:08:50 +01:00
ioapic.c Remove superfluous timer_del() calls 2021-01-08 15:13:38 +00:00
Kconfig hw/intc: Vectored Interrupt Controller (VIC) 2022-04-26 08:17:05 -07:00
loongson_liointc.c hw/intc/loongson_liointc: Fix per core ISR handling 2021-02-21 18:41:46 +01:00
m68k_irqc.c hw/m68k: Fix typo in SPDX tag 2021-11-09 10:11:27 +01:00
meson.build hw/intc: Vectored Interrupt Controller (VIC) 2022-04-26 08:17:05 -07:00
mips_gic.c qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00
nios2_vic.c hw/intc: Vectored Interrupt Controller (VIC) 2022-04-26 08:17:05 -07:00
omap_intc.c omap_intc: Use typedef name for instance_size 2020-09-09 13:20:22 -04:00
ompic.c hw: Do not include qemu/log.h if it is not necessary 2021-05-02 17:24:50 +02:00
openpic_kvm.c memory: Name all the memory listeners 2021-09-30 15:30:24 +02:00
openpic.c hw/intc: openpic: Clean up the styles 2021-09-30 12:26:06 +10:00
pl190.c Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
pnv_xive2_regs.h pnv/xive2: Add support for automatic save&restore 2022-03-02 06:51:39 +01:00
pnv_xive2.c pnv/xive2: Add support for 8bits thread id 2022-03-02 06:51:39 +01:00
pnv_xive_regs.h ppc/pnv: add a XIVE interrupt controller model for POWER9 2019-03-12 14:33:04 +11:00
pnv_xive.c ppc/xive: Add support for PQ state bits offload 2022-03-02 06:51:39 +01:00
ppc-uic.c misc: Correct relative include path 2021-06-05 21:10:42 +02:00
realview_gic.c error: Eliminate error_propagate() with Coccinelle, part 1 2020-07-10 15:18:08 +02:00
riscv_aclint.c hw/intc: riscv_aclint: Add reset function of ACLINT devices 2022-04-22 10:35:16 +10:00
riscv_aplic.c hw/intc: Add RISC-V AIA APLIC device emulation 2022-02-16 12:24:19 +10:00
riscv_imsic.c hw/intc: Add RISC-V AIA IMSIC device emulation 2022-03-03 13:14:50 +10:00
rx_icu.c hw/intc: fix heap-buffer-overflow in rxicu_realize() 2020-11-23 10:41:58 +00:00
s390_flic_kvm.c Replace qemu_real_host_page variables with inlined functions 2022-04-06 10:50:38 +02:00
s390_flic.c Do not include cpu.h if it's not really necessary 2021-05-02 17:24:51 +02:00
sh_intc.c hw/intc/sh_intc: Remove unneeded local variable initialisers 2021-10-30 18:39:37 +02:00
sifive_plic.c target/riscv: Support start kernel directly by KVM 2022-01-21 15:52:56 +10:00
slavio_intctl.c Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
spapr_xive_kvm.c spapr/xive: Use xive_esb_rw() to trigger interrupts 2021-10-21 11:42:47 +11:00
spapr_xive.c ppc/xive: Add support for PQ state bits offload 2022-03-02 06:51:39 +01:00
trace-events hw/intc/arm_gicv3_cpuif: Support vLPIs 2022-04-22 14:44:52 +01:00
trace.h trace: switch position of headers to what Meson requires 2020-08-21 06:18:24 -04:00
vgic_common.h intc/gic: Extract some reusable vGIC code 2015-09-24 01:29:36 +01:00
xics_kvm.c Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
xics_pnv.c non-virt: Fix Lesser GPL version number 2020-11-15 16:38:24 +01:00
xics_spapr.c Do not include cpu.h if it's not really necessary 2021-05-02 17:24:51 +02:00
xics.c Use g_new() & friends where that makes obvious sense 2022-03-21 15:44:44 +01:00
xilinx_intc.c Use DECLARE_*CHECKER* macros 2020-09-09 09:27:09 -04:00
xive2.c ppc/xive: Update the state of the External interrupt signal 2022-05-05 15:36:17 -03:00
xive.c ppc/xive: Update the state of the External interrupt signal 2022-05-05 15:36:17 -03:00
xlnx-pmu-iomod-intc.c qdev: set properties with device_class_set_props() 2020-01-24 20:59:15 +01:00
xlnx-zynqmp-ipi.c Include migration/vmstate.h less 2019-08-16 13:31:52 +02:00