If Xen is patched to use the same PAT Linux does, it appears to break L1TF mitigations in PV Linux 6.0.8. Linux 5.15.81 works fine. The symptom is that Linux fails to boot, with Xen complaining about an L1TF-vulnerable PTE with shadow paging disabled.
Details are at https://github.com/QubesOS/qubes-issues/issues/7935. -- Sincerely, Demi Marie Obenour (she/her/hers) Invisible Things Lab
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