XPost: linux.debian.bugs.dist, linux.debian.maint.boot

Control: reassign -1 libdebian-installer 0.110
Control: affects -1 debian-installer-9-netboot-mips64el

Bruno Bierbaumer <[email protected]> (2017-06-21):²

Package: debian-installer-9-netboot-mips64el
Severity: normal
Tags: d-i

Dear Maintainer,

I wanted to install Debian Stretch mips64el in QEMU.
It seems that the netboot installer can't find any installable kernel for this architecture.
There is definitely linux-images for 5kc-malta in the repo and the same install procedure worked for both mips and mipsel.

Steps to reproduce:

qemu-system-mips64el -M malta -m 256 -cpu MIPS64R2-generic \
-drive file=hda.qcow2,if=virtio,format=qcow2,index=0 \
-kernel vmlinux-4.9.0-3-5kc-malta \
-initrd initrd.gz \
-net user,hostfwd=tcp::22222-:22 \
-net nic \
-nographic \
-append "nokaslr"

The installer will show the error: No installable kernel was found in the defined APT sources

Some info about this:
~ # archdetect
mips64el/unknown

and “unknown” is why base-installer isn't able to pick the right kernel.

Looking at the hwmap structure in src/system/subarch-mips-linux.c (from
the libdebian-installer package), where architecture detection happens,
I initially thought we were missing some MIPS64 pattern there, but that
doesn't seem the case, as /proc/cpuinfo reports this:
| system type : MIPS Malta
…
| cpu model : MIPS GENERIC QEMU V0.0 FPU V0.0

(Full contents below for reference.)

and those are the ones which are searched through the hwmap…

I'm not sure how to fix libdebian-installer here, adding debian-mips@
and qemu maintainers in copy.

It might make sense to update the bug report title as well at some
point, since this is likely an issue on QEMU only?


KiBi.

----

~ # cat /proc/cpuinfo
system type : MIPS Malta
machine : mti,malta
processor : 0
cpu model : MIPS GENERIC QEMU V0.0 FPU V0.0
BogoMIPS : 1271.80
wait instruction : yes
microsecond timers : yes
tlb_entries : 64
extra interrupt vector : yes
hardware watchpoint : yes, count: 1, address/irw mask: [0x0ff8]
isa : mips1 mips2 mips3 mips4 mips5 mips32r1
mips32r2 mips64r1 mips64r2
ASEs implemented : mips3d
shadow register sets : 1
kscratch registers : 0
package : 0
core : 0
VCED exceptions : not available
VCEI exceptions : not available


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--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

XPost: linux.debian.bugs.dist, linux.debian.maint.boot

On 2017-06-24 19:07, Aurelien Jarno wrote:

On 2017-06-24 02:12, Cyril Brulebois wrote:

Control: reassign -1 libdebian-installer 0.110
Control: affects -1 debian-installer-9-netboot-mips64el

Bruno Bierbaumer <[email protected]> (2017-06-21):²

Package: debian-installer-9-netboot-mips64el
Severity: normal
Tags: d-i

Dear Maintainer,

I wanted to install Debian Stretch mips64el in QEMU.
It seems that the netboot installer can't find any installable kernel for this architecture.
There is definitely linux-images for 5kc-malta in the repo and the same install procedure worked for both mips and mipsel.

Steps to reproduce:

qemu-system-mips64el -M malta -m 256 -cpu MIPS64R2-generic \
-drive file=hda.qcow2,if=virtio,format=qcow2,index=0 \
-kernel vmlinux-4.9.0-3-5kc-malta \
-initrd initrd.gz \
-net user,hostfwd=tcp::22222-:22 \
-net nic \
-nographic \
-append "nokaslr"

The installer will show the error: No installable kernel was found in the defined APT sources

Some info about this:
~ # archdetect
mips64el/unknown

and “unknown” is why base-installer isn't able to pick the right kernel.

Looking at the hwmap structure in src/system/subarch-mips-linux.c (from
the libdebian-installer package), where architecture detection happens,
I initially thought we were missing some MIPS64 pattern there, but that doesn't seem the case, as /proc/cpuinfo reports this:
| system type : MIPS Malta
…
| cpu model : MIPS GENERIC QEMU V0.0 FPU V0.0

(Full contents below for reference.)

and those are the ones which are searched through the hwmap…

I'm not sure how to fix libdebian-installer here, adding debian-mips@
and qemu maintainers in copy.

It might make sense to update the bug report title as well at some
point, since this is likely an issue on QEMU only?

The current version of subarch-mips-linux.c tries to detect if the CPU
is 32 or 64-bit using the CPU type. It's therefore not prepared for the "GENERIC QEMU" type returned in /proc/cpuinfo. The code should probably
be modified to use the "isa" field as a fallback if the "cpu model"
field can't be used to determine the flavour.

I have implemented that change in libdebian-installer 0.111. This is
already available in the daily installer images [1]. Once it reaches
testing, we can consider backporting it to stretch.

Aurelien

[1] https://d-i.debian.org/daily-images/mips64el/daily/

--
Aurelien Jarno GPG: 4096R/1DDD8C9B [email protected] http://www.aurel32.net

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--- SoupGate-Win32 v1.05
* Origin: fsxNet

XPost: linux.debian.bugs.dist, linux.debian.maint.boot

On 2017-06-24 02:12, Cyril Brulebois wrote:

Control: reassign -1 libdebian-installer 0.110
Control: affects -1 debian-installer-9-netboot-mips64el

Bruno Bierbaumer <[email protected]> (2017-06-21):²

Package: debian-installer-9-netboot-mips64el
Severity: normal
Tags: d-i

Dear Maintainer,

I wanted to install Debian Stretch mips64el in QEMU.
It seems that the netboot installer can't find any installable kernel for this architecture.
There is definitely linux-images for 5kc-malta in the repo and the same install procedure worked for both mips and mipsel.

Steps to reproduce:

qemu-system-mips64el -M malta -m 256 -cpu MIPS64R2-generic \
-drive file=hda.qcow2,if=virtio,format=qcow2,index=0 \
-kernel vmlinux-4.9.0-3-5kc-malta \
-initrd initrd.gz \
-net user,hostfwd=tcp::22222-:22 \
-net nic \
-nographic \
-append "nokaslr"

The installer will show the error: No installable kernel was found in the defined APT sources

Some info about this:
~ # archdetect
mips64el/unknown

and “unknown” is why base-installer isn't able to pick the right kernel.

Looking at the hwmap structure in src/system/subarch-mips-linux.c (from
the libdebian-installer package), where architecture detection happens,
I initially thought we were missing some MIPS64 pattern there, but that doesn't seem the case, as /proc/cpuinfo reports this:
| system type : MIPS Malta
…
| cpu model : MIPS GENERIC QEMU V0.0 FPU V0.0

(Full contents below for reference.)

and those are the ones which are searched through the hwmap…

I'm not sure how to fix libdebian-installer here, adding debian-mips@
and qemu maintainers in copy.

It might make sense to update the bug report title as well at some
point, since this is likely an issue on QEMU only?

The current version of subarch-mips-linux.c tries to detect if the CPU
is 32 or 64-bit using the CPU type. It's therefore not prepared for the "GENERIC QEMU" type returned in /proc/cpuinfo. The code should probably
be modified to use the "isa" field as a fallback if the "cpu model"
field can't be used to determine the flavour.

That said, the quick workaround is to emulate a real CPU in QEMU. For
example you can select the 5KEf CPU which is a MIPS64R2 CPU with FPU.

Aurelien

--
Aurelien Jarno GPG: 4096R/1DDD8C9B [email protected] http://www.aurel32.net

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--- SoupGate-Win32 v1.05
* Origin: fsxNet