Ok. I have attempted to add hyper-v detection to the ata_piix driver.
This basically defers handling to hyper-v by default if the hypervisor
is detected. I have also added an override to allow this to be
suppressed from the command line. Could someone with a hyper-v based
cloud test the kernels below and report whether they work here. Could
you please include a dmesg of a successful boot so I can confirm the
detection has recorded itself correctly. It would also be helpful to
get a boot with ata_piix.prefer_ms_hyperv=0, again a dmesg would be
useful. Kernels are at the URL below:
http://people.canonical.com/~apw/lp929545-precise/
Kernels should be synced shortly. Thanks.
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https://bugs.launchpad.net/bugs/929545
Title:
Hyper-V: PV Drivers for Ubuntu guests running on Hyper-V lose root
device to ata_piix
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