Severity: grave I have just confirmed that this bug also seems to affect PVH DomUs, failing with:
root@hypervisor:~# xl dmesg -c (XEN) MMIO emulation failed (1): d69v0 32bit @ 0000:3fffffff -> 00 (XEN) d69v0 Triple fault - invoking HVM shutdown action 1 (XEN) *** Dumping Dom69 vcpu#0 state: *** (XEN) ----[ Xen-4.14.5 x86_64 debug=n Not tainted ]---- (XEN) CPU: 3 (XEN) RIP: 0000:[<000000003fffffff>] (XEN) RFLAGS: 0000000000010083 CONTEXT: hvm guest (d69v0) (XEN) rax: 00000000000061d6 rbx: 0000000000126000 rcx: 0000000000000000 (XEN) rdx: 0000000000000000 rsi: 0000000000000001 rdi: 0000000000000000 (XEN) rbp: 0000000000000000 rsp: 0000000000000000 r8: 0000000000000000 (XEN) r9: 0000000000000000 r10: 0000000000000000 r11: 0000000000000000 (XEN) r12: 0000000000000000 r13: 0000000000000000 r14: 0000000000000000 (XEN) r15: 0000000000000000 cr0: 0000000000000011 cr4: 0000000000000000 (XEN) cr3: 0000000000000000 cr2: 0000000000000000 (XEN) fsb: 0000000000000000 gsb: 0000000000000000 gss: 0000000000000000 (XEN) ds: 0000 es: 0000 fs: 0000 gs: 0000 ss: 0000 cs: 0000 (XEN) MMIO emulation failed (1): d70v0 32bit @ 0000:3fffffff -> 00 (XEN) d70v0 Triple fault - invoking HVM shutdown action 1 (XEN) *** Dumping Dom70 vcpu#0 state: *** (XEN) ----[ Xen-4.14.5 x86_64 debug=n Not tainted ]---- (XEN) CPU: 1 (XEN) RIP: 0000:[<000000003fffffff>] (XEN) RFLAGS: 0000000000010083 CONTEXT: hvm guest (d70v0) (XEN) rax: 00000000000061d6 rbx: 0000000000126000 rcx: 0000000000000000 (XEN) rdx: 0000000000000000 rsi: 0000000000000001 rdi: 0000000000000000 (XEN) rbp: 0000000000000000 rsp: 0000000000000000 r8: 0000000000000000 (XEN) r9: 0000000000000000 r10: 0000000000000000 r11: 0000000000000000 (XEN) r12: 0000000000000000 r13: 0000000000000000 r14: 0000000000000000 (XEN) r15: 0000000000000000 cr0: 0000000000000011 cr4: 0000000000000000 (XEN) cr3: 0000000000000000 cr2: 0000000000000000 (XEN) fsb: 0000000000000000 gsb: 0000000000000000 gss: 0000000000000000 (XEN) ds: 0000 es: 0000 fs: 0000 gs: 0000 ss: 0000 cs: 0000 This is the config I used: name = "test" vcpus = "1" memory = "2048" vif = [ "bridge=lanbr", ] disk = [ "phy:/dev/vg0/test,xvda1,w", "phy:/dev/vg0/test-swap,xvdb1,w", ] #kernel = "/usr/lib/grub-xen/grub-x86_64-xen.bin" type = "pvh" pvhshim = 1 kernel = "/usr/lib/grub-xen/grub-i386-xen_pvh.bin" As you can see, this is a relatively simple configuration which works fine with 2.04-20. Since PVH domains are the current norm and are also affected, I propose to mark this as "grave" at least. HVM DomUs work fine, however, since they don't rely on this mechanism at all (as would be expected).
