[Xen-devel] Could HVM domain change memory size by mem-set?

["You, Yongkang" <yongkang.you@xxxxxxxxx>]

Hi all,

After insert xen-balloon.ko in HVM domain, I tried to resize guest's
memory by "xm mem-set". But guest would panic
Could anybody do it successful?

It would report:
-------------------------
Unable to handle kernel NULL pointer dereference at 000000000000000c
RIP:
[<ffffc2000001a183>]
PGD 27e66067 PUD 27a23067 PMD 0
Oops: 0002 [1]
CPU 0
Modules linked in: xen_balloon xen_platform_pci
Pid: 4, comm: events/0 Not tainted 2.6.18 #1
RIP: 0010:[<ffffc2000001a183>]  [<ffffc2000001a183>]
RSP: 0000:ffff810001ab9da8  EFLAGS: 00010082
RAX: 000000000000000c RBX: 0000000000000200 RCX: ffff810001892368
RDX: ffff810001892358 RSI: ffff810001ab9dc0 RDI: 0000000000001b61
RBP: ffff810001ab9e30 R08: 0000000000000000 R09: 000000000002550c
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000200
R13: ffffffffffffeb96 R14: 0000000000000246 R15: ffff810001ab9de0
FS:  0000000000000000(0000) GS:ffffffff806d3000(0000)
knlGS:0000000000000000
CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
        CR2: 000000000000000c CR3: 0000000027c75000 CR4:
00000000000006e0
Process events/0 (pid: 4, threadinfo ffff810001ab8000, task
ffff810001a80040)
        Stack:  ffffffff88015390 ffff810027b590c0 0000000001a80080
ffffffff88017760
        0000000000000200 0000000000000000 0000000000007ff0
ffffffff80533425
        ffff810001ab9e60 ffff810001a60c40 ffff810001b576a0
ffff810001a80040
        Call Trace:
        [<ffffffff88015390>] :xen_balloon:balloon_process+0x300/0x3b0
        [<ffffffff80533425>] thread_return+0x0/0xab
        [<ffffffff8023943e>] run_workqueue+0x8e/0xd0
        [<ffffffff802395b1>] worker_thread+0x131/0x170
        [<ffffffff802262d0>] default_wake_function+0x0/0x10
        [<ffffffff802262d0>] default_wake_function+0x0/0x10
        [<ffffffff80239480>] worker_thread+0x0/0x170
        [<ffffffff8023c73a>] kthread+0xda/0x120
        [<ffffffff8020a4d0>] child_rip+0xa/0x12
        [<ffffffff8023c660>] kthread+0x0/0x120
        [<ffffffff8020a4c6>] child_rip+0x0/0x12
        Code: 00 00 0f 01 c1 c3 cc cc cc cc cc cc cc cc cc cc cc cc cc
cc
        RIP  [<ffffc2000001a183>]
        RSP <ffff810001ab9da8>
        CR2: 000000000000000c


Best Regards,
Yongkang You

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