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DVMimpl changed

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Rafal Wojtczuk 2010-09-24 18:34:10 +00:00
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@ -28,12 +28,12 @@ Preparing a savefile is done by */usr/lib/qubes/qubes\_prepare\_saved\_domain.sh
8. the domain is saved via *xm save* 8. the domain is saved via *xm save*
9. the COW files for root fs and swap are packed to `saved_cows.tar` archive 9. the COW files for root fs and swap are packed to `saved_cows.tar` archive
*qubes\_prepare\_saved\_domain.sh* script is somehow lowlevel. It is usually called by *qvm-create-default-dvm* script, that takes care of creating a special AppVM (named template\_name-dvm) to be passed to *qubes\_prepare\_saved\_domain.sh*, as well as copying the savefile to /dev/shm (the latter action is not made if the `/var/lib/qubes/dvmdata/dont_use_shm` file exists). *qubes\_prepare\_saved\_domain.sh* script is somehow lowlevel. It is usually called by *qvm-create-default-dvm* script, that takes care of creating a special AppVM (named template\_name-dvm) to be passed to *qubes\_prepare\_saved\_domain.sh*, as well as copying the savefile to /dev/shm (the latter action is not done if the `/var/lib/qubes/dvmdata/dont_use_shm` file exists).
Restoring a DisposableVM from the savefile Restoring a DisposableVM from the savefile
------------------------------------------ ------------------------------------------
When *qfilexchgd* daemon, described [here](/wiki/Qfileexchgd), sees a request to create a DVM, it executes */usr/lib/qubes/qubes\_restore* script. It is crucial that this script executes quickly, to make DisposableVM creation overhead bareable for the user. Its main steps are: When *qfilexchgd* daemon, described [here](/wiki/Qfileexchgd), sees a request to create a DVM, it executes */usr/lib/qubes/qubes\_restore* script. It is crucial that this script executes quickly, to make DisposableVM creation overhead bearable for the user. Its main steps are:
1. modify the savefile so that the VM name, VM UUID, MAC address and IP address are unique 1. modify the savefile so that the VM name, VM UUID, MAC address and IP address are unique
2. restore the COW files from the `saved_cows.tar` 2. restore the COW files from the `saved_cows.tar`