From: Gleb Natapov <gleb@redhat.com>
To: Dave Hansen <dave@sr71.net>
Cc: kvm@vger.kernel.org
Subject: Re: KVM internal error. Suberror: 1, emulation failure
Date: Thu, 18 Jul 2013 08:53:40 +0300 [thread overview]
Message-ID: <20130718055340.GZ11772@redhat.com> (raw)
In-Reply-To: <51E6C361.7030908@sr71.net>
On Wed, Jul 17, 2013 at 09:16:33AM -0700, Dave Hansen wrote:
> I'm causing qemu to spew these emulation failure messages until I kill
> it. The guest kernel being run has been hacked up pretty heavily and is
> probably either accessing bad physical addresses (above the address
> ranges in the e820 table) or trying to DMA to bad addresses.
>
It tries to do MMIO from userspace using "pcmpeqb 0x30(%rdi),%xmm1"
instruction which KVM does not emulate.
> What I'd really like qemu to be doing is trapping back in to the guest
> kernel to have it handle this issue. Then I'd have a better chance of
> dumping out some debugging information to see where I went wrong.
>
It traps back to the guest and injects #UD otherwise you wouldn't see
it spewing this message again and again. If emulation failure happens
from guest kernel space then QEMU stops on the first one.
> host kernel: 3.10
> guest kernel: Linus commit d2b4a64 + patches
> qemu: v1.4.0-2835-g6453a3a
>
> > KVM internal error. Suberror: 1
> > emulation failure
> > RAX=0000000000000000 RBX=00000000013c0410 RCX=0000000000000010 RDX=0000000000000010
> > RSI=000000000000000a RDI=00007f6d256a73c0 RBP=ffffffffffffffff RSP=00007fffe2720ce8
> > R8 =00000000ffffffff R9 =0000000000000000 R10=0000000000000022 R11=0000000000000246
> > R12=00007fffe2720d58 R13=0000000000000400 R14=00007f6d256a7000 R15=0000000000000000
> > RIP=00007f6d24c5a50e RFL=00010202 [-------] CPL=3 II=0 A20=1 SMM=0 HLT=0
> > ES =0000 0000000000000000 ffffffff 00c00000
> > CS =0033 0000000000000000 ffffffff 00a0fb00 DPL=3 CS64 [-RA]
> > SS =002b 0000000000000000 ffffffff 00c0f300 DPL=3 DS [-WA]
> > DS =0000 0000000000000000 ffffffff 00c00000
> > FS =0000 00007f6d2569d740 ffffffff 00c00000
> > GS =0000 0000000000000000 ffffffff 00c00000
> > LDT=0000 0000000000000000 ffffffff 00c00000
> > TR =0040 ffff88007b190480 00002087 00008b00 DPL=0 TSS64-busy
> > GDT= ffff88007b184000 0000007f
> > IDT= ffffffffff57a000 00000fff
> > CR0=80050033 CR2=00007f6d256a7000 CR3=000000006f13b000 CR4=000006e0
> > DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000
> > DR6=00000000ffff0ff0 DR7=0000000000000400
> > EFER=0000000000000d01
> > Code=d7 c3 85 c0 0f 85 bc 00 00 00 48 83 ea 10 0f 8e d2 00 00 00 <66> 0f 74 4f 30 66 0f d7 c1 85 c0 0f 85 b1 00 00 00 48 31 c0 c3 66 66 66 66 2e 0f 1f 84 00
> > KVM internal error. Suberror: 1
> > emulation failure
> > RAX=0000000000000000 RBX=00000000013c0410 RCX=0000000000000010 RDX=0000000000000010
> > RSI=000000000000000a RDI=00007f6d256a73c0 RBP=ffffffffffffffff RSP=00007fffe2720ce8
> > R8 =00000000ffffffff R9 =0000000000000000 R10=0000000000000022 R11=0000000000000246
> > R12=00007fffe2720d58 R13=0000000000000400 R14=00007f6d256a7000 R15=0000000000000000
> > RIP=00007f6d24c5a50e RFL=00010202 [-------] CPL=3 II=0 A20=1 SMM=0 HLT=0
> > ES =0000 0000000000000000 ffffffff 00c00000
> > CS =0033 0000000000000000 ffffffff 00a0fb00 DPL=3 CS64 [-RA]
> > SS =002b 0000000000000000 ffffffff 00c0f300 DPL=3 DS [-WA]
> > DS =0000 0000000000000000 ffffffff 00c00000
> > FS =0000 00007f6d2569d740 ffffffff 00c00000
> > GS =0000 0000000000000000 ffffffff 00c00000
> > LDT=0000 0000000000000000 ffffffff 00c00000
> > TR =0040 ffff88007b190480 00002087 00008b00 DPL=0 TSS64-busy
> > GDT= ffff88007b184000 0000007f
> > IDT= ffffffffff57a000 00000fff
> > CR0=80050033 CR2=00007f6d256a7000 CR3=000000006f13b000 CR4=000006e0
> > DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000
> > DR6=00000000ffff0ff0 DR7=0000000000000400
> > EFER=0000000000000d01
> > Code=d7 c3 85 c0 0f 85 bc 00 00 00 48 83 ea 10 0f 8e d2 00 00 00 <66> 0f 74 4f 30 66 0f d7 c1 85 c0 0f 85 b1 00 00 00 48 31 c0 c3 66 66 66 66 2e 0f 1f 84 00
> --
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--
Gleb.
next prev parent reply other threads:[~2013-07-18 5:53 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-17 16:16 KVM internal error. Suberror: 1, emulation failure Dave Hansen
2013-07-18 5:53 ` Gleb Natapov [this message]
2013-07-18 5:58 ` Paolo Bonzini
2013-07-18 6:52 ` Gleb Natapov
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