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 > -- > To unsubscribe from this list: send the line "unsubscribe kvm" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Gleb. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
