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a=Ol13hO9ccFRV9qXi2t6ftBPywas=:19 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=2OwXVqhp2XgA:10 a=GoEa3M9JfhUA:10 a=0kUd3DXMgacpLyZ-ylQA:9 a=QEXdDO2ut3YA:10 Hi, On 07/08/25 21:22, Greg KH wrote: > On Thu, Aug 07, 2025 at 03:31:17PM +0000, cat wrote: >> #regzbot introduced: v6.12.34..v6.12.35 >> >> After upgrade to kernel 6.12.35, vfio passthrough for my GPU has stopped working within a windows VM, it sees device in device manager but reports that it did not start correctly. I compared lspci logs in the vm before and after upgrade to 6.12.35, and here are the changes I noticed: >> >> - the reported link speed for the passthrough GPU has changed from 2.5 to 16GT/s >> - the passthrough GPU has lost it's 'BusMaster' and MSI enable flags >> - latency measurement feature appeared >> >> These entries also began appearing within the vm in dmesg when host kernel is 6.12.35 or above: >> >> [ 1.963177] nouveau 0000:01:00.0: sec2(gsp): mbox 1c503000 00000001 >> [ 1.963296] nouveau 0000:01:00.0: sec2(gsp):booter-load: boot failed: -5 >> ... >> [ 1.964580] nouveau 0000:01:00.0: gsp: init failed, -5 >> [ 1.964641] nouveau 0000:01:00.0: init failed with -5 >> [ 1.964681] nouveau: drm:00000000:00000080: init failed with -5 >> [ 1.964721] nouveau 0000:01:00.0: drm: Device allocation failed: -5 >> [ 1.966318] nouveau 0000:01:00.0: probe with driver nouveau failed with error -5 >> >> >> 6.12.34 worked fine, and latest 6.12 LTS does not work either. I am using intel CPU and nvidia GPU (for passthrough, and as my GPU on linux system). > > Can you use git bisect to find the offending commit?> Additional notes: I looked at the log and am listing probably relevant commit, if bisection is too costly: 68e58f579121 PCI: dwc: ep: Correct PBA offset in .set_msix() callback 523815857b1e PCI: cadence-ep: Correct PBA offset in .set_msix() callback These two might be interesting ones to consider. Please ignore this note if bisection is already in progress as these are pure guesses. Thanks, Harshit > >