Re: [Xen-devel] Android on XEN ARM question

[Peng Fan <peng.fan@xxxxxxx>]

Hi Stefano,

> -----Original Message-----
> From: Stefano Stabellini [mailto:sstabellini@xxxxxxxxxx]
> Sent: 2018年5月30日 6:49
> To: Peng Fan <peng.fan@xxxxxxx>
> Cc: Julien Grall <julien.grall@xxxxxxx>; sstabellini@xxxxxxxxxx;
> andrii_anisov@xxxxxxxx; xen-devel@xxxxxxxxxxxxxxxxxxxx;
> anthony.perard@xxxxxxxxxx
> Subject: Re: [Xen-devel] Android on XEN ARM question
> 
> On Tue, 29 May 2018, Peng Fan wrote:
> > Hi,
> >
> > I am bringing up android on XEN on ARM, but android needs some features in
> bootloader, such as A/B slot, dm verify and etc. With directly booting android
> kernel, I could successfully boot up android directly passthrough emmc
> controller to android OS. I am thinking to develop U-Boot on XEN to use the
> bootloader feature, but this surely could not handle case that use a 
> file/partition
> for android.
> >
> > Do you have any advices?
> 
> We already support running Tianocore (UEFI) as guest firmware today. I think
> that having U-Boot running on Xen on ARM as guest firmware would be
> fantastic!
> 
> Let's say that the DomU disk is backed by a file, for example you could
> have:
> 
>   disk=['/dev/loop0,raw,xvda,w,backendtype=phy']
> 
> in your VM config file. U-Boot needs to be able to access the guest disk 
> image to
> be able to retrieve the Xen and kernel binaries. For that to work, U-Boot 
> needs
> to have a PV disk frontend driver. U-Boot also needs shutdown cleanly the PV
> frontend connection before booting Xen. This is certainly possible, and 
> Anthony
> Perard (CC'ed) did similar work for Tianocore a little while back:
> 
> https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmarc.i
> nfo%2F%3Fl%3Dxen-devel%26m%3D141408836816060%26w%3D2&data=02%
> 7C01%7Cpeng.fan%40nxp.com%7C04ed488e3a2540c688a208d5c5b64e62%7C
> 686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C636632309145813276&s
> data=PuugDtCHaP525759f2U2V6ItGxFiUTWhWuDru9u%2F5jI%3D&reserved=0
> 
> With a proper PV disk frontend driver in U-Boot, the bootloader should be able
> to perform all operations as if it was connected to a regular emmc controller.

Thanks for the information. I'll first give a try on passthrough emmc 
controller in U-Boot,
then try pvdisk.

Thanks,
Peng.
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