Hi, turning on MMU_DEBUG and AUDIT in arch/x86/kvm/mmu.c (and fixing a build error, patch will follow) I got this (and then a #GP :( - patch will follow): ... kvm_mmu_get_page: looking gfn 0 role f0120 kvm_mmu_get_page: found kvm_mmu_get_page: looking gfn 0 role f0220 kvm_mmu_get_page: found kvm_mmu_get_page: looking gfn 0 role f0320 kvm_mmu_get_page: found kvm_mmu_get_page: looking gfn e1f role e0044 kvm_mmu_get_page: adding gfn e1f role e0044 rmap_write_protect: spte ffff8100660a60f8 7ca98067 paging64_page_fault: addr 100105 err 19 audit_write_protection: (pre page fault) shadow page has writable mappings: gfn e1f role e0044 audit: (pre page fault) nontrapping pte in nonleaf level: levels 4 gva 8000000000 level 4 pte 0 Is the last message indicating a problem? I get it very early during guest boot. oos_shadow is disabled. I'm currently trying to understand an obvious inconsistency in the pte describing a page of the virtio-net rx ring. On some guests with some qemu (upstream) command lines I can trigger this with '-smb /some/path' and then doing smbclient -L in the guest. Once the inconsistency slipped in, host and guest see different page contents and virtio-net stops to work. Very strange, but fortunately easily reproducible here. Any hints or debugging suggestions welcome! Jan
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