Cannot enable hyper-v in windows 8.1(EFI from bootcamp)

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TeddyIsSam Author

Level 1

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Cannot enable hyper-v in windows 8.1(EFI from bootcamp)

Hi Guys,

I wonder whether anybody has the same issue as me.

Use boot camp assistant to follow the instruction to install windows 8.1 and failed at last step said windows cannot write into boot configuration data something
Find one remediation solution to delete the partition created by boot camp and create it from disk utitlity. everything went smooth and get windows 8.1 installed(Bios), can even enable the hyper-v without any issue
Find another thread talking about EFI boot. So try it with the way(need use gdisk to do some patching and finally need recreate bcd record). windows 8.1 installed without any issue, not sure whether it is EFI boot. But I cannot enable hyper v anymore. after tick the option in windows features and it restart twice and nothing happen. The hyper-v option still remain in windows feature.

Anybody has the similar issue and provide your valuable advice? Thanks a lot.

BTW, the hardware is rMBP 15", i7 2.3GHZ, 16G RAM and 512G SSD

MacBook Pro with Retina display, OS X Mavericks (10.9.1)

Posted on Dec 20, 2013 4:04 PM

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Answer 1

Rudegar

Level 10

181,752 points

Dec 21, 2013 6:30 AM in response to TeddyIsSam

have issues with hyberv and network since windows8 where it replaced the old virtualpc thingy

it's not a windows8 or windows8.1 in bootcamp issue though for me because I have the same problems with my native work lenovo windows laptop so maybe

you can get more hyberV wise people to help in ms's site

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Answer 2

Jan 19, 2014 5:58 PM in response to TeddyIsSam

Hi TeddyIsSam

Encountered the same problem on my 27" iMac Mid-2010 (CPU i5-2500s)

I tried for hours/days and could not enable Hyper-V.

If i enabled hyper-v, windows would boot to black screen and could not be repaired without disabling hyper-v.

Found the problem. installing bootcamp from USB with always use latest EFI boot and hyper-v doesnt like it - at least on my old iMac.

Installing windows with old bootcamp style - BIOS emulation (or whatever apple call it) works OK.

non-EFI (or old bootcamp) is when you get 1-2 second of cursor flash in the top left before windows boots.

Unfortunately, i had removed my super drive DVD from iMac... so i could only install bootcamp from USB and this requires EFI boot only.

To remedy this, i used this process which was very,very time consuming, costs $ for winclone and not for beginners 🙂

http://huguesval.com/blog/2012/02/installing-windows-7-on-a-mac-without-superdri ve-with-virtualbox/

However, i can confirm i can now happily run hyper-v with Windows 8.1. great performance. It boots in old non-EFI mode which doesnt seem to have any downside? except the 1-2 cursor flash and i had to manually install latest graphics drivers from ATI as bootcamp drivers we buggy.

Hope this saves someone a lot of time!!!

im assuming later generation Macs happily run hyper-v with latest EFI.

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Answer 3

TeddyIsSam Author

Level 1

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Jan 19, 2014 8:11 PM in response to smorley82

Thanks smorley82. I do try the Hyper-V in Non-EFI Windows installation and it works. But it does not support so in EFI mode. BTW, my Macbook pro is latest 2013 retina version. It looks something is not calibrated properly at thsi stage and hope it can be solved ASAP.

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Answer 4

Jan 19, 2014 8:20 PM in response to TeddyIsSam

Perhaps virtualisation is disabled in EFI mode.... and by installing parrallels (even if you dont use it) it will enable this CPU feature?

http://mikaelkoskinen.net/macbook-air-2013-hyper-virtualization-support-is-disab led-fix/

if this is your problem, assume Apple is onto a fix but it will be EFI/BIOS fix. not something you can fix with boot partitions etc

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Answer 5

TeddyIsSam Author

Level 1

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Jan 19, 2014 9:52 PM in response to smorley82

I did purchase Parrallels but it didn't solve my problem. Hyper-V option is enabled in Windows Features but it remains unticked after ticking the options and rebooting twice.

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Answer 6

Rudegar

Level 10

181,752 points

Jan 20, 2014 7:08 AM in response to TeddyIsSam

not sure how using parrallels would fix ms's virtualisation issues with Hyper-V

never had success running a virtual machine under a virtual machine myself most virtual machine software can detect they are attempted to be used in a virtual machine and block it

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Answer 7

halr9000

Level 1

0 points

Apr 21, 2014 12:32 PM in response to smorley82

smorley82 wrote:

im assuming later generation Macs happily run hyper-v with latest EFI.

Sadly, no, the problem can happen even with the latest MBP. I'm running a 15" late-2013 retina and have the exact same issue. Have not yet come across a solid fix, but maybe there's one out there.

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