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qemu/hw/intc
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Greg Kurz 38298611d5 xics/kvm: Always set the MASKED bit if interrupt is masked 
The ics_set_kvm_state_one() function is called either to restore the
state of an interrupt source during migration or to set the interrupt
source to a default state during reset.

Since always, ie. 2013, the code only sets the MASKED bit if the 'current
priority' and the 'saved priority' are different. This is likely true
when restoring an interrupt that had been previously masked with the
ibm,int-off RTAS call. However this is always false in the case of
reset since both 'current priority' and 'saved priority' are equal to
0xff, and the MASKED bit is never set.

The legacy KVM XICS device gets away with that because it ends updating
its internal structure the same way, whether the MASKED bit is set or
the priority is 0xff.

The XICS-on-XIVE device for POWER9 is different. It sticks to the KVM
documentation [1] and _really_ relies on the MASKED bit to correctly
set. If not, it will configure the interrupt source in the XIVE HW, even
though the guest hasn't configured the interrupt yet. This disturbs the
complex logic implemented in XICS-on-XIVE and may result in the loss of
subsequent queued events.

Always set the MASKED bit if interrupt is masked as expected by the KVM
XICS-on-XIVE device. This has no impact on the legacy KVM XICS.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/virtual/kvm/devices/xics.txt

Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <156217454083.559957.7359208229523652842.stgit@bahia.lan>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2019-07-12 15:50:00 +10:00
..
allwinner-a10-pic.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
apic_common.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
apic.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
arm_gic_common.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
arm_gic_kvm.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
arm_gic.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
arm_gicv2m.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
arm_gicv3_common.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
arm_gicv3_cpuif.c hw/intc/arm_gicv3: Fix writes to ICC_CTLR_EL3 2019-05-23 14:47:44 +01:00
arm_gicv3_dist.c hw/intc/arm_gicv3: GICD_TYPER.SecurityExtn is RAZ if GICD_CTLR.DS == 1 2019-06-17 15:13:19 +01:00
arm_gicv3_its_common.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
arm_gicv3_its_kvm.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
arm_gicv3_kvm.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
arm_gicv3_redist.c hw/intc/arm_gicv3: Fix decoding of ID register range 2019-06-17 15:13:19 +01:00
arm_gicv3.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
armv7m_nvic.c target/arm: v8M: Check state of exception being returned from 2019-07-04 17:25:30 +01:00
aspeed_vic.c aspeed: vic: Add support for legacy register interface 2019-07-01 17:29:00 +01:00
bcm2835_ic.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
bcm2836_control.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
etraxfs_pic.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
exynos4210_combiner.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
exynos4210_gic.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
gic_internal.h hw/intc/arm_gic: Drop GIC_BASE_IRQ macro 2018-09-25 15:13:24 +01:00
gicv3_internal.h target-arm: Add GICv3CPUState in CPUARMState struct 2017-02-28 17:10:00 +00:00
grlib_irqmp.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
heathrow_pic.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
i8259_common.c i8259: move TYPE_INTERRUPT_STATS_PROVIDER upper 2017-12-21 09:30:32 +01:00
i8259.c qdev: use device_class_set_parent_realize/unrealize/reset() 2018-02-05 13:54:38 +01:00
imx_avic.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
imx_gpcv2.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +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 Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
ioapic.c ioapic: use irq number instead of vector in ioapic_eoi_broadcast 2019-07-05 22:19:59 +02:00
Kconfig kconfig: add CONFIG_MSI_NONBROKEN 2019-03-18 09:39:57 +01:00
lm32_pic.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
Makefile.objs spapr/xive: add KVM support 2019-05-29 11:39:45 +10:00
mips_gic.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
nios2_iic.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
omap_intc.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
ompic.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
openpic_kvm.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
openpic.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
pl190.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
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/pnv: Rework cache watch model of PnvXIVE 2019-07-02 09:43:58 +10:00
puv3_intc.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
realview_gic.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
s390_flic_kvm.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
s390_flic.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
sh_intc.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
slavio_intctl.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
spapr_xive_kvm.c spapr/xive: Add proper rollback to kvmppc_xive_connect() 2019-07-02 10:11:44 +10:00
spapr_xive.c spapr/xive: rework the mapping the KVM memory regions 2019-07-02 09:43:58 +10:00
trace-events ioapic: allow buggy guests mishandling level-triggered interrupts to make progress 2019-05-17 15:19:39 +02:00
vgic_common.h intc/gic: Extract some reusable vGIC code 2015-09-24 01:29:36 +01:00
xics_kvm.c xics/kvm: Always set the MASKED bit if interrupt is masked 2019-07-12 15:50:00 +10:00
xics_pnv.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
xics_spapr.c xics/spapr: Only emulated XICS should use RTAS/hypercalls emulation 2019-07-02 09:43:58 +10:00
xics.c xics/kvm: Add error propagation to ic*_set_kvm_state() functions 2019-07-02 09:43:58 +10:00
xilinx_intc.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
xive.c ppc/xive: Fix TM_PULL_POOL_CTX special operation 2019-07-02 09:43:58 +10:00
xlnx-pmu-iomod-intc.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
xlnx-zynqmp-ipi.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00