# Re: \[BUG\] Continuously increasing spurious interrupts inside pSeries guest on PowerNV host - From: Timothy Pearson \ - Date: 2026-08-14 15:14:46 - List: linuxppc-dev - Page: https://ratatoskr.run/linuxppc-dev/2026/08/17413414 - Thread: https://ratatoskr.run/linuxppc-dev/2026/08/17413315/t.md ```text ----- Original Message ----- > From: "Timothy Pearson" > To: "linuxppc-dev" > Cc: "Ritesh Harjani" > 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. ```