>On Fri, Jul 29, 2016 at 04:04:59AM +0000, Xulei (Stone) wrote: >> Hi, all: >> Recently when i try to reset a vm, I find it may be stuck in SeaBIOS. >> I use a shell script to continuously reset a vm to see what may happen. >> >> #!/bin/bash >> while((1)) >> do >> virsh reset VMNAME >> sleep 1 >> done >> >> After one day, the vm is stuck. Looking from the following seabios log, >> it seems seabios stops at "PCI: Using 00:02.0 for primary VGA", and can >> not execute handle_smp() any more. >> What may be the reason? > >More debugging info would be necessary to find this problem. You >could try reproducing and attaching gdb ( >http://www.seabios.org/Debugging#Debugging_with_gdb_on_QEMU ). >Alternatively, a kvm trace log may help. > kvm trace (seems useful) indicates that cpu 0 keeps always to access 0x00b3 ioport. 0x00b3 is PORT_SMI_STATUS, so i guess my bios is stuck in the function smm_relocate_and_restore { ... /* wait until SMM code executed */ while (inb(PORT_SMI_STATUS) != 0x00) ... } And top tells me cpu 0 indeed has 100% CPU utilization. So, there maybe a bug in smm setup or handle_smi if i keep continuously reset VM. ======================KVM trace log============================ CPU 0/KVM-13843 [020] d... 1025056.813494: kvm_entry: vcpu 0 CPU 0/KVM-13843 [020] .... 1025056.813495: kvm_exit: reason IO_INSTRUCTION rip 0xef10e info b30048 0 CPU 0/KVM-13843 [020] .... 1025056.813495: kvm_emulate_insn: 0:ef10e:e4 b3 (prot32) CPU 0/KVM-13843 [020] .... 1025056.813496: kvm_userspace_exit: reason KVM_EXIT_IO (2) CPU 0/KVM-13843 [020] .... 1025056.813496: kvm_fpu: unload CPU 0/KVM-13843 [020] .... 1025056.813497: kvm_pio: pio_read at 0xb3 size 1 count 1 val 0x1 CPU 0/KVM-13843 [020] .... 1025056.813497: kvm_fpu: load CPU 0/KVM-13843 [020] d... 1025056.813497: kvm_entry: vcpu 0 CPU 0/KVM-13843 [020] .... 1025056.813498: kvm_exit: reason IO_INSTRUCTION rip 0xef10e info b30048 0 CPU 0/KVM-13843 [020] .... 1025056.813498: kvm_emulate_insn: 0:ef10e:e4 b3 (prot32) CPU 0/KVM-13843 [020] .... 1025056.813499: kvm_userspace_exit: reason KVM_EXIT_IO (2) CPU 0/KVM-13843 [020] .... 1025056.813499: kvm_fpu: unload CPU 0/KVM-13843 [020] .... 1025056.813500: kvm_pio: pio_read at 0xb3 size 1 count 1 val 0x1 CPU 0/KVM-13843 [020] .... 1025056.813500: kvm_fpu: load
Thanks Kevin, looking forward to your reply! >-Kevin _______________________________________________ SeaBIOS mailing list [email protected] https://www.coreboot.org/mailman/listinfo/seabios
