Re: [Xen-users] How can you boot dom0 with a rootfilesystem that lives in memory?

["Kleve, Jesse R" <jesse.r.kleve@xxxxxxxx>]

I've been building dom0 using Xilinx yocto repos for ARM. I think a simple 
solution would be to use INITRAMFS_IMAGE_BUNDLE to go with solution 4 you 
listed although solution 1 would probably be better.

Thanks,
Jesse

On 10/24/18, 8:55 AM, "James Dingwall" <james@xxxxxxxxxxxxxx> wrote:

    On Wed, Oct 24, 2018 at 03:09:42AM +0000, Kleve, Jesse R wrote:
    > I’m trying to find a way to load a rootfs into memory and have dom0 
    > use this as the root filesystem instead of extracting the rootfs on to 
    > an SD card partition and mounting that. Is this possible? I have been 
    > unable to find any documentation on this. Is there a property in the 
    > dom0 chosen section of the device tree to specify the location of the 
    > rootfs?
    
    I have achieved this previously in several ways:
    
    1. custom initramfs scripts to load a squashfs image to memory as the root 
filesystem
    2. if you are an ubuntu user then casper (usually for livecd / netboot) can 
do this if you use toram
    3. on centos the dmsquash-live dracut module can also do something similar
    4. instead of the initramfs mounting the real root you can just make it 
*huge* and have it contain all of your dom0
    
    The best approach probably depends on how you intend to build your dom0 
    image.  (As you mention device tree and I think this is an Arm thing 
    then these solutions may not be approriate.)  Xen itself doesn't have 
    anything special afaik so solving this is going to be similar as having 
    a bare metal environment in memory.
    
    Regards,
    James
    

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