Hi there, I am doing some test on qemu vcpu hotplug and I run into some trouble. An emulation failure occurs and qemu prints the following msg: KVM internal error. Suberror: 1 emulation failure EAX=00000000 EBX=00000000 ECX=00000000 EDX=00000600 ESI=00000000 EDI=00000000 EBP=00000000 ESP=0000fff8 EIP=0000ff53 EFL=00010082 [--S----] CPL=0 II=0 A20=1 SMM=0 HLT=0 ES =0000 00000000 0000ffff 00009300 CS =f000 000f0000 0000ffff 00009b00 SS =0000 00000000 0000ffff 00009300 DS =0000 00000000 0000ffff 00009300 FS =0000 00000000 0000ffff 00009300 GS =0000 00000000 0000ffff 00009300 LDT=0000 00000000 0000ffff 00008200 TR =0000 00000000 0000ffff 00008b00if 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=31 d2 eb 04 66 83 ca ff 66 89 d0 66 5b 66 c3 66 89 d0 66 c3 <cf> 66 68 21 8a 00 00 e9 08 d7 66 56 66 53 66 83 ec 0c 66 89 c3 66 e8 ce 7b ff ff 66 89 c6 I notice that guest is still running SeabBIOS in real mode when the vcpu has just been pluged. This emulation failure can be steadly reproduced if I am doing vcpu hotplug during VM launch process. After some digging, I find this KVM internal error shows up because KVM cannot emulate some MMIO (gpa 0xfff53 ). So I am confused, (1) does qemu support vcpu hotplug even if guest is running seabios ? (2) the gpa (0xfff53) is an address of BIOS ROM section, why does kvm confirm it as a mmio address incorrectly?
