Re: [Qemu-devel] kernel-kqemu and linux

[Kevin F. Quinn]

Sorry, still fails at the same place.  It recognises the APIC:

...
Found and enabled local APIC!
mapped APIC to ffffd000 (fee00000)
...

I noticed that before the 'kernel BUG' message I got a warning that
scrolled off the screen; so I halted qemu and captured it piece by
piece:

...
hda: cache flushes not supported
 hda:Badness in blk_remove_plug at block/ll_rw_blk.c:1436
 xx blk_remove_plug+0x69/0x70
 xx ide_do_request+0x3c2/0x3f0
 xx do_ide_request+0x24/0x30
 xx generic_unplug_device+0x10/0x20
 xx block_sync_page+0x3a/0x50
...
 xx kernel_thread_helper+0x5/0xc
 hda1 hda2 hda3
------------[ cut here ]------------
kernel BUG at mm/swap.c:215!
... then as before (I can transcribe the whole trace if you want).


The warning is the following code:

int blk_remove_plug(request_queue_t *q)
{
    WARN_ON(!irqs_disabled())

"Badness in" comes from the WARN_ON macro.  So it appears that linux
expects the irqs to have been disabled, which they are in the normal
emulation but not in the virtualised kernel mode.


Without -kernel-kqemu I don't get the warning (or the BUG):

...
hda: cache flushes not supported
 hda1 hda2 hda3
hdc: ATAPI 4X CD-ROM drive, 512kB Cache

and it boots up & works fine.

Kev.



On Tue, 21 Mar 2006 00:39:15 +0100
Fabrice Bellard <address@hidden> wrote:

> Try the following patch:
> 
> diff -u -w -r1.39 helper2.c
> --- helper2.c   4 Dec 2005 18:46:06 -0000       1.39
> +++ helper2.c   20 Mar 2006 23:38:51 -0000
> @@ -110,6 +110,7 @@
>           env->pat = 0x0007040600070406ULL;
>           env->cpuid_ext_features = 0;
>           env->cpuid_features |= CPUID_FXSR | CPUID_MMX | CPUID_SSE | 
> CPUID_SSE2
> | CPUID_PAE | CPUID_SEP;
> +        env->cpuid_features |= CPUID_APIC; /* TEST */
>           env->cpuid_xlevel = 0;
>           {
>               const char *model_id = "QEMU Virtual CPU version " 
> QEMU_VERSION;
> 
> If it works then APIC usage will become the default on i386...
> 
> Fabrice.
> 
> Kevin F. Quinn wrote:
> > Hi.
> > 
> > I'm successfully running Windows 2000 guest on qemu (linux host)
> > with kernel-kqemu, and the speed is excellent.  However I can't get
> > linux to run as a guest (still linux host); no matter what kernel
> > or kernel config I create, it always BUGs at the same point:
> > 
> >  hda: hda1 hda2 hda3
> > ------------[ cut here ]------------
> > kernel BUG at mm/swap.c:215!
> > invalid operand: 0000 [#1]
> > Modules linked in:
> > CPU:    0
> > EIP:    0060:[<c0141981>]    Not tainted VLI
> > EFLAGS: 00010256   (2.6.15-gentoo-r1)
> > EIP is at release_pages+0x131/0x140
> > eax: 00000000   ebx: c12f98e0   ecx: c0458c94   edx: c12f98e0
> > esi: 00000000   edi: 00000000   ebp: 00000001   esp: d7fc1da8
> > ds: 007b   es: 007b   ss: 0068
> > Process swapper (pid: 1, threadinfo=d7fc0000 task=d7fe4a10)
> > Stack: 00000000 00000000 00000000 c136eca8 d7fc1e30 00000040
> > 0000000e c12fb160
> >        c0458bc0 00000001 c04f2ac0 c0141bca c04f2ac8 00000001
> > 00000000 d7fc1e28
> >        00000001 d7fc1e28 00000001 00000001 ffffffff c01419b5
> > d7fc1e30 00000001
> > Call TRace:
> >  [<c0141bca>] __pagevec_lru_add_active+0xaa/0xc0
> >  [<c01419b5>] __pagevec_release+0x25/0x30
> >  [<c0142119>] invalidate_mapping_pages+0xf9/0x100
> >  [<c014213e>] invalidate_inode_pages+0x1e/0x30
> >  [<c015d658>] kill_bdev+0x19/0x40
> >  [<c0232db9>] add_disk+0x49/0x60
> > ... (during ide probe)
> > 
> > 
> > If kernel-kqemu works with linux 2.6 for anyone, could you email
> > a .config that works?)
> > 
> > Thanks,
> > 
> > 
> > ------------------------------------------------------------------------
> > 
> > _______________________________________________
> > Qemu-devel mailing list
> > address@hidden
> > http://lists.nongnu.org/mailman/listinfo/qemu-devel
> 
> 
> 
> _______________________________________________
> Qemu-devel mailing list
> address@hidden
> http://lists.nongnu.org/mailman/listinfo/qemu-devel


-- 
Kevin F. Quinn

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