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Re: [Qemu-devel] [PATCH v3 2/3] pc-bios/s390-ccw/net: Use diag308 to res
From: |
Thomas Huth |
Subject: |
Re: [Qemu-devel] [PATCH v3 2/3] pc-bios/s390-ccw/net: Use diag308 to reset machine before jumping to the OS |
Date: |
Wed, 25 Apr 2018 14:34:36 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 |
On 25.04.2018 14:18, Christian Borntraeger wrote:
>
> On 04/25/2018 11:08 AM, Thomas Huth wrote:
>
>> --- a/pc-bios/s390-ccw/netmain.c
>> +++ b/pc-bios/s390-ccw/netmain.c
>> @@ -283,6 +283,15 @@ void panic(const char *string)
>> }
>> }
>>
>> +void write_subsystem_identification(void)
>> +{
>> + uint32_t *schid = (uint32_t *) 184;
>> + uint32_t *zeroes = (uint32_t *) 188;
>> +
>> + *schid = 0; /* We must not set this for virtio-net */
>> + *zeroes = 0;
>> +}
>> +
>
> I think we actually want to have the CCW devno of that network device
> stored. It has some value to know which CCW device we bootet from, no?
Actually, I tried that first (and it took quite some time to debug it),
but the Linux kernel then bails out quite early, without any error
message. The trace looks like this:
0x0000000007801802: diag %r1,%r1,776
0x0000000007801780: larl %r2,0x7831004
0x0000000007801786: llgf %r1,8
0x000000000780178c: mvc 0(12,%r0),0(%r2)
0x0000000007801792: br %r1
0x0000000000000418: bas %r14,512
0x0000000000000200: mvi 163,1
0x0000000000000204: slr %r0,%r0
0x0000000000000206: lhi %r1,2
0x000000000000020a: sigp %r1,%r0,18
0x000000000000020e: bras %r13,0x252
0x0000000000000252: lmh %r0,%r15,0(%r13)
0x0000000000000258: sam31
0x000000000000025a: br %r14
0x000000000000041c: lh %r1,184
0x0000000000000420: bct %r1,1322
0x0000000000000424: l %r1,184
0x0000000000000428: la %r2,1840
0x000000000000042c: bas %r14,640
0x0000000000000280: la %r4,0(%r14)
0x0000000000000284: la %r3,792
0x0000000000000288: la %r5,804
0x000000000000028c: la %r6,888
0x0000000000000290: la %r7,20
0x0000000000000294: st %r2,4(%r6)
0x0000000000000298: la %r2,80(%r2)
0x000000000000029c: la %r6,8(%r6)
0x00000000000002a0: bct %r7,660
0x00000000000002a4: lctl %c6,%c6,868
0x00000000000002a8: slr %r2,%r2
0x00000000000002aa: ssch 0(%r3)
0x00000000000002ae: bne 786
0x0000000000000312: lpsw 880
Guest crashed on cpu 0: disabled-wait
PSW: 0x000a000000000000 0x0000000000000000
That's the Lloader function in arch/s390/kernel/head.S which is failing
here, so seems like Linux tries to load from a block device in case
there is a value in 184. Thus I assume that 184 has to contain 0 in this
case.
Thomas
- [Qemu-devel] [PATCH v3 0/3] pc-bios/s390-ccw: Some few network boot improvements, Thomas Huth, 2018/04/25
- [Qemu-devel] [PATCH v3 1/3] pc-bios/s390-ccw/net: Split up net_load() into init, load and uninit parts, Thomas Huth, 2018/04/25
- [Qemu-devel] [PATCH v3 2/3] pc-bios/s390-ccw/net: Use diag308 to reset machine before jumping to the OS, Thomas Huth, 2018/04/25
- Re: [Qemu-devel] [PATCH v3 2/3] pc-bios/s390-ccw/net: Use diag308 to reset machine before jumping to the OS, Christian Borntraeger, 2018/04/25
- Re: [Qemu-devel] [PATCH v3 2/3] pc-bios/s390-ccw/net: Use diag308 to reset machine before jumping to the OS,
Thomas Huth <=
- Re: [Qemu-devel] [PATCH v3 2/3] pc-bios/s390-ccw/net: Use diag308 to reset machine before jumping to the OS, Christian Borntraeger, 2018/04/25
- Re: [Qemu-devel] [PATCH v3 2/3] pc-bios/s390-ccw/net: Use diag308 to reset machine before jumping to the OS, Christian Borntraeger, 2018/04/25
- Re: [Qemu-devel] [PATCH v3 2/3] pc-bios/s390-ccw/net: Use diag308 to reset machine before jumping to the OS, Thomas Huth, 2018/04/25
- Re: [Qemu-devel] [PATCH v3 2/3] pc-bios/s390-ccw/net: Use diag308 to reset machine before jumping to the OS, Christian Borntraeger, 2018/04/25
- Re: [Qemu-devel] [PATCH v3 2/3] pc-bios/s390-ccw/net: Use diag308 to reset machine before jumping to the OS, Christian Borntraeger, 2018/04/25
- Re: [Qemu-devel] [PATCH v3 2/3] pc-bios/s390-ccw/net: Use diag308 to reset machine before jumping to the OS, Thomas Huth, 2018/04/25
- Re: [Qemu-devel] [PATCH v3 2/3] pc-bios/s390-ccw/net: Use diag308 to reset machine before jumping to the OS, Christian Borntraeger, 2018/04/26
[Qemu-devel] [PATCH v3 3/3] pc-bios/s390-ccw/net: Add support for .INS config files, Thomas Huth, 2018/04/25
Re: [Qemu-devel] [PATCH v3 0/3] pc-bios/s390-ccw: Some few network boot improvements, Viktor VM Mihajlovski, 2018/04/25