RE: [Xen-devel] xm save + restore crashes Windows 2008 32-bit (4.0.2-rc2-pre)

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

> I'm trying to set it up here as well but I'm away from the office and
> getting the VGA console as far as my screen is proving tricky.
> 
> Can you try:
>  - xl pause <domid>
>  - xen-hvmctx <domid> >before
>  - xl save <domid> save-file
>  - xl restore -p save-file
>  - xl list
>  - xen-hvmctx <new-domid> >after
>  - diff -u before after
> 
> There should be a few differences to do with timers and TSCs but there
> might be some other smoking gun.  Of course it's possible that some
> piece of state got added that didn't get into the save/restore code at
> all.  It's also possible that some vital piece of memory isn't getting
> saved properly but that's less likely to be AMD-specific.
> 

I was able to remove the 'is domain running?' check from xend and
complete your request using xm.

# diff -u before after
--- before      2011-01-25 22:27:51.064451527 +1100
+++ after       2011-01-25 22:33:25.724619490 +1100
@@ -1,4 +1,4 @@
-HVM save record for domain 53
+HVM save record for domain 54
 Entry 0: type 1 instance 0, length 24
      Header: magic 0x54381286, version 1
              Xen changeset 0
@@ -22,11 +22,11 @@
              cs 0x0000001b (0x0000000000000000 + 0xffffffff / 0x00cfb)
              ds 0x00000023 (0x0000000000000000 + 0xffffffff / 0x00cf3)
              es 0x00000023 (0x0000000000000000 + 0xffffffff / 0x00cf3)
-             fs 0x0000003b (0x000000007ffdc000 + 0x00000fff / 0x004f3)
-             gs 0x00000000 (0x0000000000000000 + 0xffffffff / 0x00000)
+             fs 0x00000000 (0x00007f18bcbc6700 + 0xffffffff / 0x00000)
+             gs 0x00000000 (0xffff880028038000 + 0xffffffff / 0x00000)
              ss 0x00000023 (0x0000000000000000 + 0xffffffff / 0x00cf3)
-             tr 0x00000028 (0x0000000080157000 + 0x000020ab / 0x0008b)
-           ldtr 0x00000000 (0x0000000000000000 + 0x00000000 / 0x00000)
+             tr 0x0000e040 (0xffff82c480263a80 + 0x00000067 / 0x0008b)
+           ldtr 0x00000000 (0x0000000000000000 + 0x0000ffff / 0x00000)
            itdr            (0x0000000081fff400 + 0x000007ff)
            gdtr            (0x0000000081fff000 + 0x000003ff)
     sysenter cs 0x00000000  eip 0x0000000000000000  esp
0x0000000000000000
@@ -34,7 +34,7 @@
       MSR flags 0xffffffffffffffff  lstar 0x0000000000000000
            star 0x0000000000000000  cstar 0x0000000000000000
          sfmask 0x0000000000000000   efer 0x0000000000000800
-            tsc 0x00000018cad69045
+            tsc 0x0000008fe39fad26
           event 0x00000000 error 0x00000000
     FPU:    fcw 0x037f fsw 0x0000
             ftw 0x00 (0x00) fop 0x0000
@@ -71,7 +71,7 @@
                (0x00000000000000000000000000000000)
                (0x00000000000000000000000000000000)
 Entry 2: type 3 instance 0, length 8
-    PIC: IRQ base 0x30, irr 0, imr 0xff, isr 0
+    PIC: IRQ base 0x30, irr 0x2, imr 0xff, isr 0
          init_state 0, priority_add 0, readsel_isr 0, poll 0
          auto_eoi 0, rotate_on_auto_eoi 0
          special_fully_nested_mode 0, special_mask_mode 0
@@ -153,8 +153,8 @@
           0x01c0: 0x0000000000000004   0x01d0: 0x0000000000000000
           0x01e0: 0x0000000000000000   0x01f0: 0x0000000000000000
           0x0200: 0x0000000000000000   0x0210: 0x0000000000000000
-          0x0220: 0x0000000000000000   0x0230: 0x0000000000040000
-          0x0240: 0x0000000000000004   0x0250: 0x0000000000000000
+          0x0220: 0x0000000000000000   0x0230: 0x0000000000060000
+          0x0240: 0x0000000000000006   0x0250: 0x0000000000000000
           0x0260: 0x0000000000000000   0x0270: 0x0000000000000000
           0x0280: 0x0000000000000000   0x0290: 0x0000000000000000
           0x02a0: 0x0000000000000000   0x02b0: 0x0000000000000000
@@ -171,7 +171,7 @@
 Entry 7: type 7 instance 0, length 16
     PCI IRQs: 0x00000000000100800000000000000000
 Entry 8: type 8 instance 0, length 8
-    ISA IRQs: 0x0001
+    ISA IRQs: 0x0003
 Entry 9: type 9 instance 0, length 8
     PCI LINK: 0 0 0 0
 Entry 10: type 10 instance 0, length 56
@@ -185,11 +185,11 @@
                rd_state 0, wr_state 0, wr_latch 0, rw_mode 0
                mode 0xff, bcd 0, gate 0x1
 Entry 11: type 11 instance 0, length 16
-    RTC: regs 0x48 0x00 0x27 0x00 0x22 0x00 0x02 0x25
+    RTC: regs 0x23 0x00 0x33 0x00 0x22 0x00 0x02 0x25
               0x01 0x11 0x2a 0x42 0x00 0x80, index 0x0c
 Entry 12: type 12 instance 0, length 1048
     HPET: capability 0xf424008086a201 config 0
-          isr 0 counter 0x1308081db
+          isr 0 counter 0x55323282f
           timer0 config 0xf0000000000030 cmp 0
           timer0 period 0 fsb 0
           timer1 config 0xf0000000000030 cmp 0
@@ -200,8 +200,8 @@
     ACPI PM: TMR_VAL 0xd9f446d, PM1a_STS 0x0, PM1a_EN 0x321
 Entry 14: type 14 instance 0, length 240
     MTRR: PAT 0x7010600070106, cap 0x508, default 0xc06
-          var 0 0x00000000f0000000 0x000000fff8000800
-          var 1 0x00000000f8000000 0x000000fffc000800
+          var 0 0x00000000f0000000 0x0000000000000000
+          var 1 0x00000000f8000000 0x0000000000000000
           var 2 0x0000000000000000 0x0000000000000000
           var 3 0x0000000000000000 0x0000000000000000
           var 4 0x0000000000000000 0x0000000000000000

I don't really know a lot of what I'm looking at, but those cpu
registers shouldn't be different should they??? It almost looks like the
cpu was allowed to run for a few cycles at some point even though it was
paused.

I'll try the same on the intel box and see what happens.

Thanks

James

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