Loading...
You are not logged-in Login/Register





  • Posts   Search Threads
  • darkbuckSeptember 15, 2008 1:01 AM PDT   
    P7350 support VT?
    Hi, All

    I recently ordered a notebook with P7350. I searched Intel website which said P7350 support Virtualization technology, http://processorfinder.intel.com/details.aspx?sSpec=SLB53. But I cannot find vmx flag in /proc/cpuinfo. Does P7350 support VT? How can I enable it?

    Yours



    David Ott (Intel)September 16, 2008 9:19 AM PDT
    Rate
     
    		 #1
    Re: P7350 support VT?

    By default, systems are shipped with VT-x capabilities disabled.  Look in your system BIOS for a way to enable.  Details vary by vender.

    You can look at MSR (0x3A) to verify.  If it has 0x5 in the lower 3 bits, then VT-x is enabled. 

    -d



    darkbuckSeptember 16, 2008 11:24 AM PDT
    Rate
     
    		 #2 Reply To #1
    Re: P7350 support VT?
    my issue is that I cannot see vmx flag in /proc/cpuinfo. after reading IA-32/32e manual, I am quite confused with the relation between IA32_FEATURE_CONTROL MSR and CPUID. Is it possible to control what value CPUID will return by controlling IA32_FEATURE_CONTROL?

    The value read from IA32_FEATURE_CONTROL MSR is all 0s. I also tried to write 0x05 to it and it failed but it is ok to write value 0x01 to it.

    BTW, is it possible to enable VMX in regular OS instead of BIOS?

    Yours



    David Ott (Intel)September 18, 2008 10:40 AM PDT
    Rate
     
    		 #3 Reply To #2
    Re: P7350 support VT?

    Is there a BIOS option to enable VT?

    Also, what tool are you using to examine / change the MSR?



    darkbuckSeptember 19, 2008 2:46 AM PDT
    Rate
     
    		 #4 Reply To #3
    Re: P7350 support VT?
    I cannot find any BIOS option to enable VT. I installed Linux on my laptop and examined MSR using the tool from http://www.etallen.com/msr.html.

    The following is the output

    root@laptop:~/msr-20060206# ./msr 0x3a
    CPU 0:
       0x0000003a = 0x0000000000000000
    CPU 1:
       0x0000003a = 0x0000000000000000

    when I try to set 0x3a to 0x5, it always failed
    root@laptop:~/msr-20060206# ./msr 0x3a=5
    msr: ineffective write to MSR 0x3a
       0x0000003a = 0x0000000000000000
    msr: ineffective write to MSR 0x3a
       0x0000003a = 0x0000000000000000



    David Ott (Intel)September 22, 2008 6:33 PM PDT
    Rate
     
    		 #5 Reply To #4
    Re: P7350 support VT?

    MSR 0x3A should be accessible/modifiable by software if and only if the processor has a VT (VMX) fuse that is enabled.

    Have you checked with your OEM about whether they intended to offer the capability?

     

     

    darkbuckSeptember 23, 2008 6:33 AM PDT
    Rate
     
    		 #6 Reply To #5
    Re: P7350 support VT?
    what you mean by "intended to offer the capability"? Do you mean that BIOS is able to disable this feature and hide this feature from CPUID? If so, does that mean I have to work with laptop vendor to solve this issue?



    David Ott (Intel)September 23, 2008 3:40 PM PDT
    Rate
     
    		 #7 Reply To #6
    Re: P7350 support VT?

    A vender can choose to hide the feature by not offering a way to enable in the BIOS.  It it also possible for a vender to use a version of an Intel product that has a feature physically disabled.  They would do either of these things if they are not yet ready to support the feature in their product line.  Hence, my question -- did your laptop vendor intend to offer the capability?

    Have you checked whether there exists a BIOS update from your vender?  Perhaps one now exists that supports enabling this feature.



    darkbuckSeptember 24, 2008 5:42 AM PDT
    Rate
     
    		 #8 Reply To #7
    Re: P7350 support VT?
    I don't know whether they intend or not and haven't heard any updates on BIOS yet. anyway, thanks for your information.


    janciciOctober 5, 2008 8:02 AM PDT
    Rate
     
    		 #9
    Re: P7350 support VT?

    I did buy Asus laptop M51vr with P7350.

    I have same problem here, when loading kvm-intel module I am geting a message "operation not supported"

    I did check my BIOS and I did find there "VT-d" which was enable.

    I did try to change to disable, boot and load module > same message so I did enable VT-d in BIOS boot and load module and same message.

    this functionality of procesor was one of the main requiments for my new laptop.

    hope that it is only software problem ...



    David Ott (Intel)October 6, 2008 1:53 PM PDT
    Rate
     
    		 #10 Reply To #9
    Re: P7350 support VT?
    Note that many systems need to be cold booted after changing the VT-d BIOS setting for it to take effect.  That is, change the setting in the BIOS, save, and then power the system down and unplug it for a minute or two.  Then put the plug back in and bring it up. 

     



Forum jump:  

Intel Software Network Forums Statistics

17,025 users have contributed to 48,317 threads and 172,754 posts to date.

In the past 24 hours, we have 9 new thread(s) 56 new posts(s), and 52 new user(s).

In the past 3 days, the most popular thread for everyone has been How to manage rounding by IVF ?? The most posts were made to Most likely, the issue is that The post with the most views is Optimalization of sine function\'s taylor expansion

Please welcome our newest member redfruit83


For more complete information about compiler optimizations, see our Optimization Notice.