| Message ID | 8E78D212B8C25246BE4CE7EA0E645FE53EFD8C@SZXEMI504-MBS.china.huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 03/08/2016 11:43, Xulei (Stone) wrote: > Hi, all: > Recently I use a shell script to continuously reset a vm to see what may happen. > After one day, the vm is stuck. Looking from the following seabios log and > kvm trace log, it seems like losing a SMI or SeaBIOS can not handle a SMI. > This problem is reproducible on my machine (SeaBIOS 1.9.1, Qemu 2.6.0, > Kmod 4.4.11). Thanks for the report! The more interesting part of the trace would be around the pio_write at 0xb2. Also please try kernel commit c43203cab1e, which just went into 4.8. Paolo > ==================my shell script=== > #!/bin/bash > while((1)) > do > virsh reset VMNAME > sleep 1 > done > > ==================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 > > ==================my seabios log=== > --- a/roms/seabios/src/fw/smm.c > +++ b/roms/seabios/src/fw/smm.c > @@ -65,7 +65,8 @@ handle_smi(u16 cs) > u8 cmd = inb(PORT_SMI_CMD); > struct smm_layout *smm = MAKE_FLATPTR(cs, 0); > u32 rev = smm->cpu.i32.smm_rev & SMM_REV_MASK; > - dprintf(DEBUG_HDL_smi, "handle_smi cmd=%x smbase=%p\n", cmd, smm); > + if(cmd == 0x00) { > + dprintf(1, "handle_smi cmd=%x smbase=%p\n", cmd, smm); > + } > > if (smm == (void*)BUILD_SMM_INIT_ADDR) { > // relocate SMBASE to 0xa0000 > @@ -147,14 +148,14 @@ smm_relocate_and_restore(void) > { > /* init APM status port */ > outb(0x01, PORT_SMI_STATUS); > + dprintf(1,"before SMI====\n"); > > /* raise an SMI interrupt */ > outb(0x00, PORT_SMI_CMD); > + dprintf(1,"after SMI=====\n"); > > /* wait until SMM code executed */ > while (inb(PORT_SMI_STATUS) != 0x00) > ; > + dprintf(1,"smm code executes complete====\n"); > > And the log output like this: > 2016-08-03 16:23:15PCI: Using 00:02.0 for primary VGA > 2016-08-03 16:23:15smm_device_setup start > 2016-08-03 16:23:15init smm > 2016-08-03 16:23:15before SMI==== > 2016-08-03 16:23:15after SMI===== <----always stuck here, unless i destroy it > > As above, it is obviously that if bios doesn't handle_smi, PORT_SMI_STATUS is > always 0x01. smm_relocate_and_restore() will always in the while loop. > > Why does bios handle_smi at this point, is this a kvm bug? or SeaBIOS bug? > > -------------- > Xulei (Stone) >
==================my shell script=== #!/bin/bash while((1)) do virsh reset VMNAME sleep 1 done ==================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 ==================my seabios log=== --- a/roms/seabios/src/fw/smm.c +++ b/roms/seabios/src/fw/smm.c @@ -65,7 +65,8 @@ handle_smi(u16 cs) u8 cmd = inb(PORT_SMI_CMD); struct smm_layout *smm = MAKE_FLATPTR(cs, 0); u32 rev = smm->cpu.i32.smm_rev & SMM_REV_MASK; - dprintf(DEBUG_HDL_smi, "handle_smi cmd=%x smbase=%p\n", cmd, smm); + if(cmd == 0x00) { + dprintf(1, "handle_smi cmd=%x smbase=%p\n", cmd, smm); + } if (smm == (void*)BUILD_SMM_INIT_ADDR) { // relocate SMBASE to 0xa0000 @@ -147,14 +148,14 @@ smm_relocate_and_restore(void) { /* init APM status port */ outb(0x01, PORT_SMI_STATUS); + dprintf(1,"before SMI====\n"); /* raise an SMI interrupt */ outb(0x00, PORT_SMI_CMD); + dprintf(1,"after SMI=====\n"); /* wait until SMM code executed */ while (inb(PORT_SMI_STATUS) != 0x00) ; + dprintf(1,"smm code executes complete====\n"); And the log output like this: 2016-08-03 16:23:15PCI: Using 00:02.0 for primary VGA 2016-08-03 16:23:15smm_device_setup start