On Fri, Aug 14, 2026 at 09:56:30AM -0500, Timothy Pearson wrote: > 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. >
I am able to replicate this observation with KVM on PowerNV (XIVE): 1. Host and guest with kernel 6.19 (stock fedora kernels): Huge number of spurious interrupts 2. Host and guest with upstream kernel 5.19: A very small number of spurious interrupts observed. We'll look into this and post a fix. Thanks, Gautam
