[Xen-users] CPUID DomU configuration not working

[Fanny Dwargee <fdwargee6@xxxxxxxxx>]

Hi,

I'm trying to remove the VMX feature from the CPUID responses (bit 5 returned on ecx register) setting the cpuid DomU configuration for a HVM Windows7.

Unfortunately using the CPUID instruction from inside the guest does still shows the VMX bit as enabled.

No error is visible on logs nor xl dmesg. Xen is v4.6.1 compiled from source.

DomU configuration follows:

name = "win7-sp1-x64-2"

firmware_override = "/usr/local/lib/xen/boot/hvmloader"

builder='hvm'

vcpus = 1

maxcpus = 1

cpuid = [ '0x1:ecx=xxxxxxxxxxxxxxxxxxxxxxxxxx0xxxxx' ]

hap  = 1

acpi = 1

_on_poweroff_ = 'destroy'

on_reboot   = 'restart'

on_crash    = 'destroy'

vif = [ 'type=ioemu,model=e1000 ]

disk = [ 'phy:/dev/vms/win7-sp1-x64-2,hda,w', 'file:/opt/iso/win7.iso,hdc:cdrom,r' ]

boot="cd"

serial = 'pty'

usb = 1

usbdevice = 'tablet'

#altp2mhvm = 1

keymap = 'es'

vga = 'stdvga'

videoram = 16

XL info follows:

host                   : vmi-test

release                : 3.16.0-4-amd64

version                : #1 SMP Debian 3.16.7-ckt20-1+deb8u2 (2016-01-02)

machine                : x86_64

nr_cpus                : 4

max_cpu_id             : 7

nr_nodes               : 1

cores_per_socket       : 2

threads_per_core       : 2

cpu_mhz                : 2790

hw_caps                : bfebfbff:28100800:00000000:00003f00:17bae3ff:00000000:00000001:00000000

virt_caps              : hvm hvm_directio

total_memory           : 3983

free_memory            : 2896

sharing_freed_memory   : 0

sharing_used_memory    : 0

outstanding_claims     : 0

free_cpus              : 0

xen_major              : 4

xen_minor              : 6

xen_extra              : .1

xen_version            : 4.6.1

xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64

xen_scheduler          : credit

xen_pagesize           : 4096

platform_params        : virt_start=0xffff800000000000

xen_changeset          :

xen_commandline        : placeholder dom0_mem=1024M,max:1024M dom0_max_vcpus=2 dom0_vcpus_pin=true hap_1gb=false hap_2mb=false altp2m=1 consoleblank=0 vga=normal nofb

cc_compiler            : gcc (Debian 4.9.2-10) 4.9.2

cc_compile_by          : root

cc_compile_domain      :

cc_compile_date        : Wed Mar  2 16:02:45 CET 2016

xend_config_format     : 4

Could anyone help? Perhaps do I need to enable some configure option for compiling?

Regards,

Fanny

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