Hi, I've got a bit worrying report[1], that using Windows PV block driver, together with backing file opened with O_DIRECT on BTRFS results in checksum errors. At this point it's unclear what exactly happens there, it could be some BTRFS issue, some xen-blkback issue, but since according to reports it happens only with Windows DomU, the most likely culprit is PV driver inside Windows DomU. It was detected on BTRFS because it does checksumming, but it isn't clear whether other file systems are not affected too.
I guess using O_DIRECT is asking for troubles here, but nevertheless, it looks like it might have uncovered some issue that would be silently ignored otherwise. [1] https://github.com/QubesOS/qubes-issues/issues/9488#issuecomment-2389152014 -- Best Regards, Marek Marczykowski-Górecki Invisible Things Lab
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