[Qemu-devel] KVM emulation failure with recent kernel and QEMU Seabios

[Jan Kiszka]

Hi,

apparently since the latest QEMU updates I'm getting this once in a
while:

KVM internal error. Suberror: 1
emulation failure
EAX=00000000 EBX=00000000 ECX=00000000 EDX=000fd2bc
ESI=00000000 EDI=00000000 EBP=00000000 ESP=00000000
EIP=000fd2c5 EFL=00010007 [-----PC] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
CS =0008 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
SS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
FS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
GS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     000f6a80 00000037
IDT=     000f6abe 00000000
CR0=60000011 CR2=00000000 CR3=00000000 CR4=00000000
DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 
DR3=0000000000000000 
DR6=00000000ffff0ff0 DR7=0000000000000400
EFER=0000000000000000
Code=66 ba bc d2 0f 00 e9 a2 fe f3 90 f0 0f ba 2d 04 ff fb 3f 00 <72> f3 8b 25 
00 ff fb 3f e8 44 66 ff ff c7 05 04 ff fb 3f 00 00 00 00 f4 eb fd fa fc 66 b8
KVM internal error. Suberror: 1
emulation failure
EAX=00000000 EBX=00000000 ECX=00000000 EDX=000fd2bc
ESI=00000000 EDI=00000000 EBP=00000000 ESP=00000000
EIP=000fd2bc EFL=00010007 [-----PC] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
CS =0008 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
SS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
FS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
GS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     000f6a80 00000037
IDT=     000f6abe 00000000
CR0=60000011 CR2=00000000 CR3=00000000 CR4=00000000
DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 
DR3=0000000000000000 
DR6=00000000ffff0ff0 DR7=0000000000000400
EFER=0000000000000000
Code=0a 00 e8 a0 64 ff ff 0f aa 66 ba bc d2 0f 00 e9 a2 fe f3 90 <f0> 0f ba 2d 
04 ff fb 3f 00 72 f3 8b 25 00 ff fb 3f e8 44 66 ff ff c7 05 04 ff fb 3f 00 00
KVM internal error. Suberror: 1
emulation failure
EAX=00000000 EBX=00000000 ECX=00000000 EDX=000fd2bc
ESI=00000000 EDI=00000000 EBP=00000000 ESP=00000000
EIP=000fd2c5 EFL=00010007 [-----PC] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
CS =0008 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
SS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
FS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
GS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     000f6a80 00000037
IDT=     000f6abe 00000000
CR0=60000011 CR2=00000000 CR3=00000000 CR4=00000000
DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 
DR3=0000000000000000 
DR6=00000000ffff0ff0 DR7=0000000000000400
EFER=0000000000000000
Code=66 ba bc d2 0f 00 e9 a2 fe f3 90 f0 0f ba 2d 04 ff fb 3f 00 <72> f3 8b 25 
00 ff fb 3f e8 44 66 ff ff c7 05 04 ff fb 3f 00 00 00 00 f4 eb fd fa fc 66 b8

The command line to trigger it:

qemu-system-x86_64 -m 1G -enable-kvm -s -cpu kvm64 -smp 4 -no-kvm-irqchip

The issue did not yet show up when using in-kernel irqchips or when
doing "git checkout 11d39a13 pc-bios", i.e. reverting the recent BIOS
updates.

I'm on QEMU master (with 04f56432 reverted) and either kernel 4.0.0-rc3
or kvm.git next.

Jan