Re: [Xen-devel] [QUESTION] x86_64 -> i386/i686 CPU translation between xl and qemu binary?

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 04/02/2016 23:44, Alex Braunegg wrote:
> Hi Andrew,
>
> I don't know enough on the internals of xen / qemu here - however, based on
> what you said, an x86_64 OS with >4Gb memory should boot via xl - however in
> my case here it fails to start up:
>
> -------------------------------------------------------------
>
> [root@mynas-s5000xvn ~]# xl -vvvv create /etc/xen/config/Windows_2008_R2.cfg
>
> Parsing config from /etc/xen/config/Windows_2008_R2.cfg
> libxl: debug: libxl_create.c:1560:do_domain_create: ao 0x735690: create:
> how=(nil) callback=(nil) poller=0x734b70
> libxl: debug: libxl_device.c:269:libxl__device_disk_set_backend: Disk
> vdev=hda spec.backend=unknown
> libxl: debug: libxl_device.c:298:libxl__device_disk_set_backend: Disk
> vdev=hda, using backend phy
> libxl: debug: libxl_device.c:269:libxl__device_disk_set_backend: Disk
> vdev=hdc spec.backend=unknown
> libxl: debug: libxl_device.c:298:libxl__device_disk_set_backend: Disk
> vdev=hdc, using backend phy
> libxl: debug: libxl_create.c:945:initiate_domain_create: running bootloader
> libxl: debug: libxl_bootloader.c:324:libxl__bootloader_run: not a PV domain,
> skipping bootloader
> libxl: debug: libxl_event.c:691:libxl__ev_xswatch_deregister: watch
> w=0x736078: deregister unregistered
> xc: detail: elf_parse_binary: phdr: paddr=0x100000 memsz=0x5b3a4
> xc: detail: elf_parse_binary: memory: 0x100000 -> 0x15b3a4
> xc: detail: VIRTUAL MEMORY ARRANGEMENT:
> xc: detail:   Loader:   0000000000100000->000000000015b3a4
> xc: detail:   Modules:  0000000000000000->0000000000000000
> xc: detail:   TOTAL:    0000000000000000->000000017f000000
> xc: detail:   ENTRY:    0000000000100600
> xc: detail: PHYSICAL MEMORY ALLOCATION:
> xc: detail:   4KB PAGES: 0x0000000000000200
> xc: detail:   2MB PAGES: 0x00000000000005f7
> xc: detail:   1GB PAGES: 0x0000000000000003
> xc: detail: elf_load_binary: phdr 0 at 0x7efc906d7000 -> 0x7efc90728910
> xc: error: Could not clear special pages (22 = Invalid argument): Internal
> error
> libxl: error: libxl_dom.c:1003:libxl__build_hvm: hvm building failed

The problem is here, but it isn't immediately apparent why (other than
"failed to map special pages").

> Guest Config:
> =============
>
> -------------------------------------------------------------
>
> builder='hvm'
> memory = 6144
> shadow_memory = 8

These values look suspicious to me.  What hardware is this running on?
Either you are on more modern hardware and shouldn't touch
shadow_memory, or you are on rather older hardware, at which point 8M of
shadow memory is probably too small for a 6G VM.

~Andrew

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