On 03/28/2016 05:34 AM, Fanny Dwargee wrote:
Hi,
I'm currently using Xen v4.6.1 compiled from sources on Linux Debian
Jessie and I would like to change the CPUID hypervisor vendor string
when queried from a HVM DomU (Windows7 SP1 64 bits).
According to http://www.sandpile.org/x86/cpuid.htm#level_4000_0000h
this information is queried via EAX=0x40000000 and returned on
EBX-ECX-EDX registers
The current vendor string is "XenVMMXenVMM" and I want to replace it
by the string "JUSTATEST" so I changed my DomU configuration to:
[...]
cpuid = [
'0x40000000:eax=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx,ebx=01010100010100110101010101001010,ecx=00000000000000000000000001010100,edx=01010011010001010101010001000001'
]
hap = 1
acpi = 1
altp2mhvm = 1
[...]
but unfortunately the guest still shows "XenVMMXenVMM" as the
hypervisor string.
After looking for that string in the Xen sources it seems to be
harcoded in many places:
* xen-4.6.1/docs/misc/pvrdtscp.c
* xen-4.6.1/tools/firmware/seabios-dir-remote/src/fw/xen.c
* xen-4.6.1/tools/firmware/hvmloader/hvmloader.c
* xen-4.6.1/tools/misc/xen-detect.c
* xen-4.6.1/unmodified_drivers/linux-2.6/platform-pci/platform-pci.c
* xen-4.6.1/xen/include/public/arch-x86/cpuid.h
* xen-4.6.1/extras/mini-os/include/xen/arch-x86/cpuid.h
* xen-4.6.1/dist/install/usr/local/include/xen/arch-x86/cpuid.h
...so I'm afraid I will be unable to change it.
Any ideas or patches?
Thanks in advance
You can't change hypervisor signature (or most values in hypervisor
leaves). See man page for xl.conf syntax ('cpuid' option) or
libxc/xc_cpuid_x86.c:xc_cpuid_policy().
-boris
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel
