Hi Stefano, > -----Original Message----- > From: Stefano Stabellini [mailto:sstabell...@kernel.org] > Sent: 2020年6月4日 23:32 > To: Oleksandr Andrushchenko <oleksandr_andrushche...@epam.com> > Cc: Peng Fan <peng....@nxp.com>; Roman Shaposhnik > <ro...@zededa.com>; Xen-devel <xen-devel@lists.xenproject.org>; Stefano > Stabellini <sstabell...@kernel.org>; Julien Grall <jul...@xen.org>; Nataliya > Korovkina <malus.brandyw...@gmail.com> > Subject: Re: UEFI support in ARM DomUs > > On Thu, 4 Jun 2020, Oleksandr Andrushchenko wrote: > > On 6/4/20 4:57 AM, Peng Fan wrote: > > > Grall <jul...@xen.org>; > > >> Nataliya Korovkina <malus.brandyw...@gmail.com> > > >> Subject: UEFI support in ARM DomUs > > > We have made U-Boot run inside XEN DomU, but just only PV console > > > part, not implement other frontend drivers currently. Would this > > > help for your case if enable EFI in U-Boot? > > > > Well, we have a working PV block implementation on top of that on iMX8 > > > > platform, mostly ported from mini-os. Currently we are finalizing the > > work > > > > and cleaning up (it's going to take a week or so hopefully). Then, we > > we'll post > > > > it on our public github. We are also thinking about upstreaming the > > work, but it may > > > > take quite some time if the whole idea fits u-boot's view on such an > extension at all. > > Yes please to both of you! :-)
The simple console part https://source.codeaurora.org/external/imx/uboot-imx/tree/drivers/serial/serial_xen.c?h=imx_v2020.04_5.4.24_2.1.0 We enable U-Boot in DomU is mostly for android auto dual bootloader case. It has the issue that only have console output after mmu enabled in U-Boot stage. Regards, Peng. > > In the meantime, while we wait for those changes to go upstream in uboot, > could you please post a branch on github and a link on this email thread? > > Maybe we should have a wikipage on wiki.xenproject.org about > work-in-progress uboot items. > > > > > > > Regards, > > > Peng. > > > > > >> Hi! > > >> > > >> with a lot of help from Stefano, we're getting RPi4 support in > > >> Project EVE pretty much on par between KVM and Xen. > > >> > > >> One big area that still remains is supporting UEFI boot sequence for > DomUs. > > >> With KVM, given the qemu virt device model this is as simple as > > >> using either stock UEFI build for arm or even U-Boot EFI emulation > > >> environment and passing it via -bios option. > > >> > > >> Obviously with Xen on ARM we don't have the device model so my > > >> understanding is that the easiest way we can support it would be to > > >> port UEFI's OvmfPkg/OvmfXen target to ARM (it seems to be currently > > >> exclusively X64). > > >> > > >> So here's my first question: if there's anybody on this list who > > >> had a hand in implementing OvmfPkg/OvmfXen can you please share > > >> your thoughts on how much work that port may be (or whether it is > > >> even feasible -- I may totally be missing something really obvious here). > > >> > > >> And as long as I've got your attention: two more questions: > > >> 1.. compared to the above, would porting pvgrub to ARM be any > > >> easier or more difficult? > > >> > > >> 2. same question for teaching u-boot about PV calls. > > >> > > >> Thanks, > > >> Roman. > > >> > > >> P.S. Oh and I guess between: > > >> 0. OvmfPkg/OvmfXen on ARM64 > > >> 1. pvgrub on ARM64 > > >> 2. u-boot/EFI emulation with PV calls backend I didn't miss any > > >> other obvious way of making UEFI-aware VM images to boot on Xen > > >> ARM64 DomU, right?
