----- Original Message -----
> From: "Timothy Pearson" <[email protected]>
> To: "linuxppc-dev" <[email protected]>
> Cc: "Ritesh Harjani" <[email protected]>
> Sent: Friday, August 14, 2026 9:56:30 AM
> Subject: [BUG] Continuously increasing spurious interrupts inside pSeries
> guest on PowerNV host
> With kernel 6.12 (Debian stable) we see a continuously increasing spurious
> interrupt count inside a pSeries guest running on a PowerNV host:
>
> cat /proc/interrupts
> CPU0
> 16: 0 XIVE-IPI 0 Edge IPI-0
> 17: 0 XIVE-IRQ 4096 Edge RAS_EPOW
> 21: 2 XIVE-IRQ 4353 Edge hvc_console
> 23: 0 XIVE-IRQ 4097 Edge RAS_HOTPLUG
> 24: 0 pSeries-PCI-MSI 0 Edge virtio0-config
> 25: 50995 pSeries-PCI-MSI 1 Edge virtio0-input.0
> 26: 45569 pSeries-PCI-MSI 2 Edge virtio0-output.0
> 27: 0 pSeries-PCI-MSI 16384 Edge virtio1-config
> 28: 6 pSeries-PCI-MSI 16385 Edge virtio1-input
> LOC: 5781 Local timer interrupts for timer event device
> BCT: 0 Broadcast timer interrupts for timer event device
> LOC: 2 Local timer interrupts for others
> SPU: 449927 Spurious interrupts
> PMI: 0 Performance monitoring interrupts
> MCE: 0 Machine check exceptions
> NMI: 0 System Reset interrupts
> WDG: 0 Watchdog soft-NMI interrupts
> DBL: 0 Doorbell interrupts
>
> The spurious interrupts are apparently from the virtio0-[input|output]
> devices.
Actually, I don't know where the spurious interrupts are coming from. This is
in XIVE mode. Switching to XICS mode via -M pseries,ic-mode=xics greatly
reduces the rate of spurious interrupts, but does not eliminate them.
I don't recall this being an issue on the 5.x series kernels, but do not have
the ability to test either those or the 7.x series at the moment.
