[BitVisor-devel-en:107] Re: Other OS's?

[Lonnie Cumberland]

Hello
> macOS works on BitVisor on Intel Mac.  Turning off Secure Boot using
> Startup Security Utility on recovery environment is needed before
> starting BitVisor.  Enabling DMAR pass-through might be needed to use
> some devices on macOS.

Thanks for  the clarification on this.

> SQLite code can be used in processes in process/sqlite/ directory.
> Example implementation is process/sqlite/sqliteexample.c which can be
> launched from dbgsh.  The database can be stored to volatile memory or
> non-volatile storage (a hard disk drive or a solid state drive
> connected to ATA/AHCI or NVMe).  However currently no file system is
> supported.  The database will be stored to raw sectors.  In addition,
> the storage access only works while the ATA/AHCI/NVMe controllers are
> in active state (i.e. the guest operating system driver needs to be
> working).
>

I will investigate it more since I need a database that bitvisor can 
store information which may/may not be accessible by the guest OS.

You mention that the data is stored as raw sectors and I wonder how the 
performance is in this approach when compared to Sqlite running under 
and OS just as a thought that I will keep in mind.  Also, as I am 
investigating how bitvisor can read/write to/from drives as well, this 
made me wonder if there is a potential problem when bitvisor is writing 
to a disk drive and at the same time the Guest OS tries to read/write 
to/from the same drive.  This seems like it would present a problem 
unless even  the guest read/writes are managed by bitvisor as well which 
seems to be the case in that the native bitvisor can be set up to 
encrypt data read/write to the drive.  I still need to work through this 
as well. Is there any documented steps on how to set this up and test in 
QEMU which I have been able to use successfully so far?

Thanks again
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