Re: [Xen-devel] ARM: Issues while Enabling hibernation in domU(linux) on jacinto-j6

[Julien Grall <julien.grall@xxxxxxx>]

On 09/07/18 09:59, moin anjnawala wrote:
> Hi Julien,
Hello,

[...]

> [   18.746774] PC is at safe_copy_page+0x1c/0x38
> [   18.746774] LR is at safe_copy_page+0x20/0x38
> [   18.746774] pc : [<c018b800>]    lr : [<c018b804>]    psr: a00300d3
> [   18.746774] sp : d62b3d14  ip : d62b3d14  fp : d62b3d28
> [   18.746774] r10: c0c9f000  r9 : d779dd64  r8 : d770dc68
> [   18.746774] r7 : 00005137  r6 : c0f9b260  r5 : c0fc7ec0  r4 : d2cca000
> [   18.746774] r3 : ffffffff  r2 : d2ccb000  r1 : d7469000  r0 : d6cd1000
> [   18.746774] Flags: NzCv  IRQs off  FIQs off  Mode SVC_32  ISA ARM
> Segment none
> [   18.746774] Control: 10c5387d  Table: 560c006a  DAC: 00000051
> [   18.746774] Process bash (pid: 283, stack limit = 0x(ptrval))
> [   18.746774] Stack: (0xd62b3d14 to 0xd62b4000)
> [   18.746774] 3d00:
> ffffffff c0f09504 d62b3d60
> [   18.746774] 3d20: d62b3d2c c018da0c c018b7f0 00000001 d62b3d7c
> d6ccb900 00000030 d62b3dac
> [   18.746774] 3d40: 00000000 00000008 00000010 d61f5890 c0c9f000
> d62b3d78 d62b3d64 c0110ad4
> [   18.746774] 3d60: c018d640 00000000 00000030 d62b3de4 d62b3d7c
> c0110730 c0110ad0 56d24000
> [   18.746774] 3d80: d62b3dac 4011d6a0 00000000 b6f4e4c0 b6f4e4c0
> 00000051 4000406a 10c5387d
> [   18.746774] 3da0: 00000000 00f00000 00000000 c0f9695c d677ee00
> 00000000 c0f02800 c0c0754c
> [   18.746774] 3dc0: d61f5890 00000005 d62b3de4 c01108fc c0f9695c
> 00000000 d62b3df4 d62b3de8
> [   18.746774] 3de0: c0110bd4 c01108b8 d62b3e1c d62b3df8 c018aab4
> c0110bc4 00000000 c0f1a2c8
> [   18.746774] 3e00: 00000000 c0f9b130 d62f2280 c0f1a228 d62b3e4c
> d62b3e20 c018b3f0 c018a770
> [   18.746774] 3e20: c0271418 00000005 d5e68198 d62f2280 00000005
> d61f5880 d62f2280 d62b3f68
> [   18.746774] 3e40: d62b3e64 d62b3e50 c0189408 c018b288 d62f2280
> 00000000 d62b3e74 d62b3e68
> [   18.746774] 3e60: c0903cbc c01893b0 d62b3e8c d62b3e78 c0316b44
> c0903cac c0316af0 00000000
> [   18.746774] 3e80: d62b3ec4 d62b3e90 c031619c c0316afc 00000000
> 00000000 d62b3efc d60cc840
> [   18.746774] 3ea0: 00000005 d60cc840 d62b3f68 00000005 000ce408
> 00000000 d62b3f34 d62b3ec8
> [   18.746774] 3ec0: c02a13d8 c03160b0 00000800 00000008 00000000
> 0000081f c091b8f4 b6f5d560
> [   18.746774] 3ee0: c0f0b7ec d62b3fb0 b6f5d968 000c5758 d62b3fac
> d62b3f00 c0117fd0 c091b900
> [   18.746774] 3f00: 00000000 c02a1630 d62b3f34 d62b3f18 c029d7c4
> d60cc840 00000005 000ce408
> [   18.746774] 3f20: d62b3f68 00000005 d62b3f64 d62b3f38 c02a1670
> c02a13ac d60cc840 c02c0ae8
> [   18.746774] 3f40: 00000000 00000000 d60cc840 d60cc840 00000005
> 000ce408 d62b3f94 d62b3f68
> [   18.746774] 3f60: c02a1880 c02a15c8 00000000 00000000 00000005
> 000ce408 b6eccb50 00000004
> [   18.746774] 3f80: c01011e4 d62b2000 d62b3fa4 d62b3f98 c02a18ec
> c02a1840 00000000 d62b3fa8
> [   18.746774] 3fa0: c0101000 c02a18e0 00000005 000ce408 00000001
> 000ce408 00000005 00000000
> [   18.746774] 3fc0: 00000005 000ce408 b6eccb50 00000004 00000005
> 00000000 000c5758 00000000
> [   18.746774] 3fe0: 00000000 bee588e4 b6e2fc85 b6e6af26 40020030
> 00000001 00000000 00000000
> [   18.746774] [<c018b800>] (safe_copy_page) from [<c018da0c>]
> (swsusp_save+0x3d8/0x480)
> [   18.746774] [<c018da0c>] (swsusp_save) from [<c0110ad4>]
> (arch_save_image+0x10/0x48)
> [   18.746774] [<c0110ad4>] (arch_save_image) from [<c0110730>]
> (cpu_suspend_abort+0x0/0x30)
> [   18.746774] Code: e52de004 e8bd4000 e1a04000 e1a00001 (eb03838b)
> [   18.746774] ---[ end trace d5b1b8f68a0ece68 ]---
> [   18.746774] ------------[ cut here ]------------
> [   18.746774] WARNING: CPU: 0 PID: 0 at kernel/time/timekeeping.c:760
> ktime_get+0xec/0xf8
> [   18.746774] Modules linked in:
> [   18.746774] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G      D
>    4.17.4-00012-g8675d93-dirty #289
> [   18.746774] Hardware name: Generic DT based system
> [   18.746774] [<c011376c>] (unwind_backtrace) from [<c010e688>]
> (show_stack+0x20/0x24)
> [   18.746774] [<c010e688>] (show_stack) from [<c08ffb64>]
> (dump_stack+0x98/0xac)
> [   18.746774] [<c08ffb64>] (dump_stack) from [<c01316d8>] (__warn+0x104/0x11c)
> [   18.746774] [<c01316d8>] (__warn) from [<c01317e0>]
> (warn_slowpath_null+0x50/0x58)
> [   18.746774] [<c01317e0>] (warn_slowpath_null) from [<c01b3210>]
> (ktime_get+0xec/0xf8)
> [   18.746774] [<c01b3210>] (ktime_get) from [<c01c32fc>]
> (tick_nohz_idle_enter+0x44/0x8c)
> [   18.746774] [<c01c32fc>] (tick_nohz_idle_enter) from [<c016354c>]
> (do_idle+0x2c/0x240)
> [   18.746774] [<c016354c>] (do_idle) from [<c0163a3c>]
> (cpu_startup_entry+0x28/0x2c)
> [   18.746774] [<c0163a3c>] (cpu_startup_entry) from [<c0914c48>]
> (rest_init+0xe0/0xe4)
> [   18.746774] [<c0914c48>] (rest_init) from [<c0e00f80>]
> (start_kernel+0x450/0x464)
> [   18.746774] ---[ end trace d5b1b8f68a0ece69 ]---
>
> Also, one more observation I have had is that hibernation image
> creation does not crash for linux mainline version upto v4.7.10 but
> not for later versions.
I am not sure to follow this. Which version are you using for Dom0? For 
DomU? Earlier you mention 4.17, but now you mention 4.7...
[...]

> Is there any plan to support hibernation from userspace on arm on xen
> for any future release ? If not then what implementations I need to
> add in xen and linux to enable hibernation on domU for arm?
As I mention in my previous reply, it is very likely that some bits 
would need to be implemented for Arm. I haven't looked at the series, 
but I think you can look at x86 code and replicate for Arm.
Cheers,

--
Julien Grall

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