On 1 Jul 2014 20:28, "Phillip Susi" <ps...@ubuntu.com> wrote: > > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On 7/1/2014 12:18 PM, Andrey Borzenkov wrote: > > В Tue, 01 Jul 2014 12:06:08 -0400 Phillip Susi <ps...@ubuntu.com> > > пишет: > > > >> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 > > > >> I have been trying to fix grub to load a 32 bit kernel from the > >> 64 bit xen build. After fixing up one or two minor issues with > >> the elf loader, I believe I now have it to the point where it > >> jumps correctly to the 32 bit kernel and it crashes there, since > >> it is 32 bit code still executing on a cpu in 64 bit mode. The > >> question is how to return the cpu to 32 bit mode *under xen*? > > > > > > IIRC it was already discussed not long ago and it seems to be Xen > > limitation. You probably need to ask on xen-devel to be sure. > > > > Is it not more simple to use 32 bit grub with 32 bit kernel to > > start with? > > The problem with that is that you have to know in advance which kernel > you are going to boot. That makes configuring virtual hosts harder; > they just want one grub image they can use to chainload whatever the > guest wants to install in their domain. > > Also there must be a way to do this otherwise a 64 bit kernel running > under xen wouldn't be able to execute a 32 bit binary. Binaries don't have to use e.g. paging table or hypercall mechanism. You need to either make xen switch all those structures or port kernels to fake-32-xen mode. When either is done GRUB part will be trivial but either of those tasks is outside of grub scope. > I suppose I'll > Cc xen-devel. > > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v2.0.17 (MingW32) > Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ > > iQEcBAEBAgAGBQJTsv2uAAoJEI5FoCIzSKrwvQQIAIZ/ipl4MRQcf2nhOBUFzEzM > WTNx4ul/ZAtEDATMpokIpnhZuU1VDqzeOHbHZDXQfXZbYyhHM5LTKqiCLEGW0qnE > Q+qW5Q9cKeXolx/hjZ4FrUU1fMHZ9tZ7dhb68iB1aGELZVtR7yXJFsl+4ZF6LPvN > 5/w3g6WAd4fWpfEswL34EzaUW0RAfa0O4xmgHbQkkXftO1TLOoiswwGcW3xc9nai > jr03H9NyOUTgZX89xhR/LAKuCMivs/FWARQ1UDMwy9KfY0IIoka94BfL36T4te01 > HrYmiXtKoiaOZ0IyEhm5HY+X7bHBZU/eycQ3KdRG8aW694Y0zrCEEKhw0pJpbw0= > =Vadi > -----END PGP SIGNATURE----- > > _______________________________________________ > Grub-devel mailing list > Grub-devel@gnu.org > https://lists.gnu.org/mailman/listinfo/grub-devel
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