Re: [Xen-devel] [Xen-users] xl info displays less ram than the total available

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Wed, Oct 26, 2016 at 10:30:18AM +0200, blallo@xxxxxxxxxx wrote:
> Blallo:
> > 
> > 
> > 
> > -------- Original Message --------
> > From: Daniel Kiper <daniel.kiper@xxxxxxxxxx>
> > Sent: 6 October 2016 15:16:18 CEST
> > To: blallo@xxxxxxxxxx
> > Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap 
> > <george.dunlap@xxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Andrew Cooper 
> > <andrew.cooper3@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxx" 
> > <xen-devel@xxxxxxxxxxxxx>
> > Subject: Re: [Xen-devel] [Xen-users] xl info displays less ram than the 
> > total available
> > 
> > On Thu, Oct 06, 2016 at 02:58:57PM +0200, blallo@xxxxxxxxxx wrote:
> > 
> > [...]
> > 
> > >   multiboot /xen.gz
> > >   echo    'Loading Xen with linux-grsec...'
> > >   module  /vmlinuz-linux root=/dev/mapper/leonovo-rootvol rw  
> > > cryptdevice=UUID=02bbde36-5fda-478f-a54f-b6f495e24961:leonovo 
> > > root=/dev/mapper/leonovo-rootvol
> > >   echo    'Loading initial ramdisk to launch dom0 (linux-grsec)...'
> > >   module  /initramfs-linux.img
> > 
> > Forget about multiboot on EFI platforms. It does not work.
> > At least with Xen. Please load xen.efi binary directly
> > (as Jan suggested) or if you wish GRUB2 then you must use
> > relevant patches for Xen and GRUB2. Check this threads for
> > more details:
> >  - http://lists.gnu.org/archive/html/grub-devel/2016-03/msg00299.html
> >  - https://lists.xen.org/archives/html/xen-devel/2016-09/msg03330.html
> > 
> > Daniel
> > 
> > 
> 
> Ok, I've been stuck at this point. I am not able, just following the two
> strategies suggested in the wiki [*] to obtain a working efi image of xen. If 
> I
> understood well, the cross toolchain is a compiler/linker that outputs PE efi
> images, so I tried in three different ways:
> 
> 1. As suggested here [1] I recompiled binutils with x86_64-pep support
> and did a make && configure. The build process exited with errors [2].
> Nevertheless I got an efi image in dist/install/usr/lib64/efi/
> 
> % ls dist/install/usr/lib64/efi/
> 
> xen-4.8.0-rc.efi
> xen-4.8.efi -> xen-4.8.0-rc.efi
> xen-4.efi -> xen-4.8.0-rc.efi
> xen.efi -> xen-4.8.0-rc.efi
> 
> Note: I set EFI_VENDOR=archlinux and mkdir'd
> dist/install/boot/efi/efi/archlinux
> 
> I will explain later as I tried to boot these images.
> 
> 2. I installed mingw from the Arch Linux repos. Then configure && I set
> 
> CROSSCOMPILE=x86_64-w64-mingw32- make world -j8

Never used that.
> 
> at compile time. But again no xen.efi image in dist/install/ and a non
> bootable dist/install/usr/lib64/efi/. After the build I get [3].
> 
> 3. At last I manually implemented [4] the Fedora patch [5] (because I'm 
> trying to
> compile 4.8.0-rc3 and that patch is for another version, don't know which).

Yeah that one needs a bit of tweaking.
> Again, same result as before: no efi image in dist/install and those in
> dist/install/usr/lib64/efi/ are not bootable.

You can also look at this:

https://bugzilla.redhat.com/show_bug.cgi?id=1376870

and recompile binutils with the patch.
> 
> I switched to systemd-boot to chainload the xen.efi image. I
> successfully boot my Arch Linux system, therefore i assume that this
> bootloader works. I have (hopefully) properly configured [6] a xen.cfg file
> in the same path as the xen.efi images obtained before.
> I can't boot yet.
> Trying to bypass the bootloader I created an efi boot entry with
> efibootmgr and, via the laptop firmware interface, I tried to boot
> directly in xen.
> Again no results.
> 
> Is there anybody patient enough to explain to me how to proceed?
> 
> Greetings :)
> 
> --
> Leonardo
> 
> [*] https://wiki.xen.org/wiki/Xen_EFI#Compiling_Xen_as_EFI
> [1] https://bbs.archlinux.org/viewtopic.php?id=174226
> [2] http://pastebin.com/bEVvX8w6
> [3] http://pastebin.com/cfZLbeC3
> [4] http://pastebin.com/vDVqn9it
> [5] 
> http://pkgs.fedoraproject.org/cgit/rpms/xen.git/tree/xen.fedora.efi.build.patch
> [6] http://pastebin.com/FPg6DcPa

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