> >
> > Just to clarify, in the restore path I print the values to be saved
to
> > the segment registers, then I read the segment registers and print
the
> > values that are in them. They aren't the same. Doesn't that sound
like a
> > problem on the restore side?
>
> That would depend on how you read the values after the restore - the
> patch is for a bug that I think is causing svm_get_segment_register()
to
> corrupt the vmcb if it's called before the vcpu is first scheduled
(and
> to return the corrupted values).
>
I see. I just tested and while I still get the crash, all the segment
registers are now correct after applying your patch.
The only thing I can see that's different now is the MTRR's.
James
--- before 2011-01-26 09:16:19.030666000 +1100
+++ after 2011-01-26 09:21:13.374664075 +1100
@@ -1,4 +1,4 @@
-HVM save record for domain 4
+HVM save record for domain 6
Entry 0: type 1 instance 0, length 24
Header: magic 0x54381286, version 1
Xen changeset 0
@@ -34,7 +34,7 @@
MSR flags 0xffffffffffffffff lstar 0x0000000000000000
star 0x0000000000000000 cstar 0x0000000000000000
sfmask 0x0000000000000000 efer 0x0000000000000800
- tsc 0x000000172cbec19e
+ tsc 0x0000005866dd3e1f
event 0x00000000 error 0x00000000
FPU: fcw 0x027f fsw 0x0000
ftw 0x00 (0x00) fop 0x0000
@@ -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 0x16 0x00 0x16 0x00 0x09 0x00 0x03 0x26
+ RTC: regs 0x12 0x00 0x21 0x00 0x09 0x00 0x03 0x26
0x01 0x11 0x2a 0x42 0x00 0x80, index 0x0c
Entry 12: type 12 instance 0, length 1048
HPET: capability 0xf424008086a201 config 0
- isr 0 counter 0x1f65b81fc
+ isr 0 counter 0x43a264ae0
timer0 config 0xf0000000000030 cmp 0
timer0 period 0 fsb 0
timer1 config 0xf0000000000030 cmp 0
@@ -200,8 +200,8 @@
ACPI PM: TMR_VAL 0x19b239a8, 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
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