Re: [SeaBIOS] [ipxe-devel] [Qemu-devel] Emulation failure on booting/rebooting VMs

March 20, 2015


      On 19.03.2015 19:31, Mohammed Gamal wrote:
...
On Wed, Mar 18, 2015 at 7:09 PM, Kevin O'Connor <kevin@koconnor.net
<mailto:kevin@koconnor.net>> wrote:
On Wed, Mar 18, 2015 at 06:36:48PM +0100, Mohammed Gamal wrote:
    > Hi,
    > I've been sporadically getting my KVM virtual machines crashing
    with this
    > message while they're booting
    >
    > KVM internal error. Suberror: 1
    > emulation failure
    > EAX=00000000 EBX=00000000 ECX=00000000 EDX=00600f12
    > ESI=00000000 EDI=00000000 EBP=00000000 ESP=0000fffa
    > EIP=0000ff53 EFL=00000006 [-----P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
    > ES =0000 00000000 0000ffff 00009300
    > CS =f000 000f0000 0000ffff 00009b00
    > SS =0000 00000000 0000ffff 00009200
    > DS =0000 00000000 0000ffff 00009300
    > FS =0000 00000000 0000ffff 00009300
    > GS =0000 00000000 0000ffff 00009300
    > LDT=0000 00000000 0000ffff 00008200
    > TR =0000 00000000 0000ffff 00008300
    > GDT=     00000000 0000ffff
    > IDT=     00000000 0000ffff
    > CR0=60000010 CR2=00000000 CR3=00000000 CR4=00000000
    > DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000
    > DR3=0000000000000000
    > DR6=00000000ffff0ff0 DR7=0000000000000400
    > EFER=0000000000000000
    > Code=74 65 61 6d 2e 00 66 68 5f 55 00 00 e9 c3 f8 fb f4 cb 66 c3
    <cf> 66 68
    > ff e6 00 00 e9 8b b1 66 55 66 57 66 56 66 53 66 89 c1 66 89 d6 a8
    07 75 23
    > 66 0f
    >
    > I am running qemu 1.2, seabios 1.7.3 and ipxe (1.0.0-f6840ba) and
    the host
    > CPU is AMD Opteron 6386 SE running kernel 3.4.71.
To debug seabios issues, we need the full log - see:
      http://www.seabios.org/Debugging
But, your software versions are a bit old which makes diagnosing any
    issues hard.  I suggest updating to the latest software and seeing if
    the problem is still present.
-Kevin
Unfortunately I can't change that setup. The problem is also rather
sporadic so I have no other means to reproduce it and debug it.
I tried looking into the seabios code but it looks like the instruction
pointer is pointing at the default interrupt vector table entry
'entry_iret_official'. I presume this means that was triggered with an
interrupt of some sort? The other register values don't seem to provide
any clues nevertheless.
I thought maybe this commit was relevant,
https://git.ipxe.org/wimboot.git/commitdiff/1f11d05addc7aab9097b59e07680a0d1...,
but noticed you're not using wimboot at all...

-- Robin

Robin Smidsrød

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