[Xen-devel] hang on restore in 3.3.1

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

I am having problems with save/restore under 3.3.1 in the GPLPV drivers.
I call hvm_shutdown(xpdd, SHUTDOWN_suspend), but as soon as I lower IRQL
(enabling interrupts), qemu goes to 100% CPU and the DomU load goes
right up too.

Xentrace is showing a whole lot of this going on:


CPU0  200130258143212 (+     770)  hypercall  [ rip =
0x000000008020632a, eax = 0xffffffff ]
CPU0  200130258151107 (+    7895)  hypercall  [ rip =
0x00000000802062eb, eax = 0xffffffff ]
CPU0  200130258156293 (+    5186)  hypercall  [ rip =
0x00000000802062eb, eax = 0xffffffff ]
CPU0  200130258161233 (+    4940)  hypercall  [ rip =
0x00000000802062eb, eax = 0xffffffff ]
CPU0  200130258165467 (+    4234)  hypercall  [ rip =
0x000000008020640a, eax = 0xffffffff ]
CPU0  200130258167202 (+    1735)  domain_wake       [ domid =
0x00000062, edomid = 0x00000000 ]
CPU0  200130258168511 (+    1309)  switch_infprev    [ old_domid =
0x00000000, runtime = 31143 ]
CPU0  200130258168716 (+     205)  switch_infnext    [ new_domid =
0x00000062, time = 786, r_time = 30000000 ]
CPU0  200130258169338 (+     622)  __enter_scheduler [
prev<domid:edomid> = 0x00000000 : 0x00000000, next<domid:edomid> =
0x00000062 : 0x00000000 ]
CPU0  200130258175532 (+    6194)  VMENTRY     [ dom:vcpu = 0x00000062 ]
CPU0  200130258179633 (+    4101)  VMEXIT      [ dom:vcpu = 0x00000062,
exitcode = 0x0000004e, rIP  = 0x0000000080a562b9 ]
CPU0  0 (+       0)  MMIO_AST_WR [ address = 0xfee000b0, data =
0x00000000 ]
CPU0  0 (+       0)  PF_XEN      [ dom:vcpu = 0x00000062, errorcode =
0x0b, virt = 0xfffe00b0 ]
CPU0  0 (+       0)  INJ_VIRQ    [ dom:vcpu = 0x00000062, vector = 0x00,
fake = 1 ]
CPU0  200130258185932 (+    6299)  VMENTRY     [ dom:vcpu = 0x00000062 ]
CPU0  200130258189737 (+    3805)  VMEXIT      [ dom:vcpu = 0x00000062,
exitcode = 0x00000064, rIP  = 0x0000000080a560ad ]
CPU0  0 (+       0)  INJ_VIRQ    [ dom:vcpu = 0x00000062, vector = 0x83,
fake = 0 ]
CPU0  200130258190990 (+    1253)  VMENTRY     [ dom:vcpu = 0x00000062 ]
CPU0  200130258194791 (+    3801)  VMEXIT      [ dom:vcpu = 0x00000062,
exitcode = 0x0000007b, rIP  = 0x0000000080a5a29e ]
CPU0  0 (+       0)  IO_ASSIST   [ dom:vcpu = 0x0000c202, data = 0x0000
]
CPU0  200130258198944 (+    4153)  switch_infprev    [ old_domid =
0x00000062, runtime = 17087 ]
CPU0  200130258199132 (+     188)  switch_infnext    [ new_domid =
0x00000000, time = 17087, r_time = 30000000 ]
CPU0  200130258199702 (+     570)  __enter_scheduler [
prev<domid:edomid> = 0x00000062 : 0x00000000, next<domid:edomid> =
0x00000000 : 0x00000000 ]
CPU0  200130258206470 (+    6768)  hypercall  [ rip =
0x00000000802062eb, eax = 0xffffffff ]
CPU0  200130258210964 (+    4494)  hypercall  [ rip =
0x00000000802062eb, eax = 0xffffffff ]
CPU0  200130258214767 (+    3803)  hypercall  [ rip =
0x00000000802062eb, eax = 0xffffffff ]
CPU0  200130258218019 (+    3252)  hypercall  [ rip =
0x00000000802062eb, eax = 0xffffffff ]
CPU0  200130258227419 (+    9400)  hypercall  [ rip =
0x00000000802062eb, eax = 0xffffffff ]

It kind of looks like vector 0x83 is being fired over and over, which
would explain why things hang once I enable interrupts again. I will
look into what vector 0x83 is attached to, but does anyone have any
ideas?

Thanks

James

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