-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 On Wed, Sep 14, 2016 at 01:22:56AM -0700, ludwig jaffe wrote: > Am Dienstag, 13. September 2016 09:57:53 UTC+2 schrieb ludwig jaffe: > > Qubes OS 3.2 rc3: can not boot with VT-d enabled on DELL T7400 (XEON E5440, > > Intel 5400 chipset) > > > > Hi all, I can NOT boot on my machine, Dell T7400 (XEON E5440, Intel 5400 > > chipset, LSI HW-RAID1 "DELL SAS6" and 4GB RAM - will become more) with VT-d > > enabled. > > When I disable VT-d in bios, the machine boots and can run several VMs. > > > > VT-d is needed to assign certain pci-devices to VMs (e.g. scsi-controller > > to vm with some proprietary scanner application running windows). > > > > How does it behave? > > > > The grub screen is loaded, and one can select the options, here I edit to > > remove quiet as I want to see. > > > > So grub loads, XEN, vmlinuz, initrd.img, > > and then it crashes on the spot, causing the machine to reboot. > > > > No debug output can be seen. > > > > Any Ideas? > > > > > > Thanks, > > > > > > Ludwig > > Hi, I tried to change this in grub while booting: > press esc and edit the line with the kernel parameters and I removed "quiet" > and added "console=com1 com1=115200,8n1 > loglvl=all"
This should go to xen parameters, not linux kernel. The line with "xen.gz" (instead of "console=none"). > Also I tried with com2 as my fat DELL T7400 has 2 real serial interfaces. > I used a 0 modem cable and minicom with a linux laptop that also has a real > serial interface. > But maybe, I made a mistake (wrong /dev/tty or cable problem) and I will > check again and redo it. > But the console output was still written to the screen (I guess it is the > output of grub while it boots). After grub finishes loading XEN, KERNEL, > initrd.img, the machine crashes on the spot with VT-d enabled, and reboots. Just an idea - try also iommu=no-igfx xen option. It helps in some cases... > So I guess the initial code that gets executed after grub, which should be > the xen, causes the machine to crash. > Any Ideas? > Is there a debug-version of xen that qubes-os uses. > The parameters in grub where I remove this stupid "quiet" are just for the > kernel, that gets executed later, after xen! > I do not see any screen output, even no flicker with text. > Just after grub finishes a blank black screen and then the machine reboots. > So xen should at least write some hello world stuff to the screen. > > Quite strange. How to debug xen? > - -- Best Regards, Marek Marczykowski-Górecki Invisible Things Lab A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing? -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQEcBAEBCAAGBQJX2e0dAAoJENuP0xzK19csTkgH/jIV6XWGLK86zLyZNTh26zdw /+GtY4RLDs4gGivpLswfEI5actP0YpdrNRRGmQlRsKh+bajc8kcZHUsqwVnaiUW8 a0ZzhgHbtV6i9XmbctttoLh5Wr4ROLtvLq3XWaNN/szSY5nk4+wxmYnd4aT4jwlJ AP4P5rnpLMtOdno3Y0ZHjWp//liXsRanzaBOzGr/PmFNk9DnLNXCb6TyTBbA6Coi MvjLHDDKJhUxgBiZFxTiZhFgEsE1REv+pF2EjJPRaJHHqfnAuarPo0TESYF1grsQ hiJL7KJ2nxh7W14WWFSzm+07kWi0B57MJjmYrjArJxZolfslj3eg3pJgwuw2ebQ= =+OEj -----END PGP SIGNATURE----- -- You received this message because you are subscribed to the Google Groups "qubes-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to qubes-users+unsubscr...@googlegroups.com. To post to this group, send email to qubes-users@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/qubes-users/20160915003644.GW31510%40mail-itl. For more options, visit https://groups.google.com/d/optout.
