"MMIO emulation failed" from booting OVMF on Xen v4.9.0

["Andri Möll" <andri@dot.ee>]

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Hey,

As per Andrew [Cooper]'s suggestion, writing here instead of #xen on 
Freenode.

I'm trying out Xen (4.9.0) with OVMF (r21243.3858b4a1ff-1) and having it 
crash right on boot both with the 32b and 64b OVMF binaries. This is on 
Arch Linux, AMD Ryzen on a X370 motherboard.

Given the following minimal VM declaration:
> builder = "hvm"
> maxmem = 512
> memory = 512
> vcpus = 1
> on_poweroff = "destroy"
> on_reboot = "destroy"
> on_crash = "destroy"
> bios = "ovmf"
> device_model_version = "qemu-xen"
> bios_path_override = "/usr/share/ovmf/ovmf_code_ia32.bin"
and running it with `xl create vm.cfg`, I see it crash while booting 
with the following displayed by `xl dmesg`:

> (XEN) MMIO emulation failed: d1v0 16bit @ f000:0000ff54 -> 66 ea 5c ff 
> ff ff 10 00 b8 40 06 00 00 0f 22
> (XEN) d1v0 Triple fault - invoking HVM shutdown action 1
I've run the hypervisor with `guest_loglvl=all` for more output and 
attached it here and uploaded it at 
https://gist.github.com/moll/a46dffc7466ced93a0365a6916a4db96 in case 
the file doesn't go through.

Any ideas anyone? Thanks in advance!

Andri

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(XEN) HVM1 save: CPU
(XEN) HVM1 save: PIC
(XEN) HVM1 save: IOAPIC
(XEN) HVM1 save: LAPIC
(XEN) HVM1 save: LAPIC_REGS
(XEN) HVM1 save: PCI_IRQ
(XEN) HVM1 save: ISA_IRQ
(XEN) HVM1 save: PCI_LINK
(XEN) HVM1 save: PIT
(XEN) HVM1 save: RTC
(XEN) HVM1 save: HPET
(XEN) HVM1 save: PMTIMER
(XEN) HVM1 save: MTRR
(XEN) HVM1 save: VIRIDIAN_DOMAIN
(XEN) HVM1 save: CPU_XSAVE
(XEN) HVM1 save: VIRIDIAN_VCPU
(XEN) HVM1 save: VMCE_VCPU
(XEN) HVM1 save: TSC_ADJUST
(XEN) HVM1 save: CPU_MSR
(XEN) HVM1 restore: CPU 0
(d1) HVM Loader
(d1) Detected Xen v4.9.0
(d1) Xenbus rings @0xfeffc000, event channel 1
(d1) System requested OVMF
(d1) CPU speed is 3001 MHz
(d1) Relocating guest memory for lowmem MMIO space disabled
(d1) PCI-ISA link 0 routed to IRQ5
(d1) PCI-ISA link 1 routed to IRQ10
(d1) PCI-ISA link 2 routed to IRQ11
(d1) PCI-ISA link 3 routed to IRQ5
(d1) pci dev 01:3 INTA->IRQ10
(d1) pci dev 02:0 INTA->IRQ11
(d1) No RAM in high memory; setting high_mem resource base to 100000000
(d1) pci dev 03:0 bar 10 size 002000000: 0f0000008
(d1) pci dev 02:0 bar 14 size 001000000: 0f2000008
(d1) pci dev 03:0 bar 30 size 000010000: 0f3000000
(d1) pci dev 03:0 bar 14 size 000001000: 0f3010000
(d1) pci dev 02:0 bar 10 size 000000100: 00000c001
(d1) pci dev 01:1 bar 20 size 000000010: 00000c101
(d1) Multiprocessor initialisation:
(d1)  - CPU0 ... 48-bit phys ... fixed MTRRs ... var MTRRs [1/8] ... done.
(d1) Writing SMBIOS tables ...
(d1) Loading OVMF ...
(XEN) d1v0 Over-allocation for domain 1: 131329 > 131328
(d1) Loading ACPI ...
(d1) CONV disabled
(d1) vm86 TSS at fc00a400
(d1) BIOS map:
(d1)  ffe00000-fffdffff: Main BIOS
(d1) E820 table:
(d1)  [00]: 00000000:00000000 - 00000000:000a0000: RAM
(d1)  HOLE: 00000000:000a0000 - 00000000:000f0000
(d1)  [01]: 00000000:000f0000 - 00000000:00100000: RESERVED
(d1)  [02]: 00000000:00100000 - 00000000:1f715000: RAM
(d1)  HOLE: 00000000:1f715000 - 00000000:fc000000
(d1)  [03]: 00000000:fc000000 - 00000001:00000000: RESERVED
(d1) Invoking OVMF ...
(XEN) MMIO emulation failed: d1v0 16bit @ f000:0000ff54 -> 66 ea 5c ff ff ff 10 00 b8 40 06 00 00 0f 22
(XEN) d1v0 Triple fault - invoking HVM shutdown action 1
(XEN) *** Dumping Dom1 vcpu#0 state: ***
(XEN) ----[ Xen-4.9.0  x86_64  debug=n   Not tainted ]----
(XEN) CPU:    6
(XEN) RIP:    f000:[<000000000000ff54>]
(XEN) RFLAGS: 0000000000000046   CONTEXT: hvm guest (d1v0)
(XEN) rax: 0000000040000023   rbx: 000000000000ff74   rcx: 0000000000000000
(XEN) rdx: 0000000000000000   rsi: 0000000000000000   rdi: 0000000000005042
(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: 0000000040000033   cr4: 0000000000000000
(XEN) cr3: 0000000000000000   cr2: 0000000000000000
(XEN) ds: f000   es: 0000   fs: 0000   gs: 0000   ss: 0000   cs: f000

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