From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrea Genuise Subject: vTPM detaching issue Date: Mon, 13 Jun 2016 17:10:35 +0200 Message-ID: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============2862171886035574771==" Return-path: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" To: xen-devel@lists.xen.org List-Id: xen-devel@lists.xenproject.org --===============2862171886035574771== Content-Type: multipart/alternative; boundary=001a1134e21855305805352a4a53 --001a1134e21855305805352a4a53 Content-Type: text/plain; charset=UTF-8 I'm not sure if this is a bug or my fault, but when I create a domain with a vTPM attached, detaching it sometimes causes the following error to be thrown (I post the command sequence): [root@localhost ~]# xl create /etc/xen/vtpmmgr-stubdom Parsing config from /etc/xen/vtpmmgr-stubdom [root@localhost ~]# xl create /etc/xen/vtpm1 Parsing config from /etc/xen/vtpm1 [root@localhost ~]# xl create /etc/xen/dom1_ima Parsing config from /etc/xen/dom1_ima [root@localhost ~]# xl vtpm-detach dom1 vtpm1 [root@localhost ~]# xl destroy dom1 [root@localhost ~]# xl vtpm-detach vtpm1 vtpmmgr libxl: error: libxl_device.c:952:device_backend_callback: unable to remove device with path /local/domain/18/backend/vtpm/19/0 libxl: error: libxl.c:1995:device_addrm_aocomplete: unable to remove vtpm with id 0 libxl_device_vtpm_remove failed. Sometimes the error is raised while detaching vtpmmgr from vtpm (as reported), other times while detaching vtpm from domain. I think this could be a synchronization problem. I report some info: [root@localhost ~]# xl info host : localhost.localdomain release : 3.18.25-19.without_tpm.el7.centos.x86_64 version : #1 SMP Sun Apr 10 18:10:14 CEST 2016 machine : x86_64 nr_cpus : 2 max_cpu_id : 3 nr_nodes : 1 cores_per_socket : 2 threads_per_core : 1 cpu_mhz : 2394 hw_caps : bfebfbff:20100800:00000000:00000900:0408e3fd:00000000:00000001:00000000 virt_caps : hvm hvm_directio total_memory : 3996 free_memory : 2888 sharing_freed_memory : 0 sharing_used_memory : 0 outstanding_claims : 0 free_cpus : 0 xen_major : 4 xen_minor : 6 xen_extra : .1-5.el7 xen_version : 4.6.1-5.el7 xen_caps : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64 xen_scheduler : credit xen_pagesize : 4096 platform_params : virt_start=0xffff800000000000 xen_changeset : Tue Mar 29 11:02:43 2016 +0100 git:8210a62-dirty xen_commandline : placeholder dom0_mem=1024M,max:1024M cpuinfo com1=115200,8n1 console=com1,tty loglvl=all guest_loglvl=all cc_compiler : gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-4) cc_compile_by : mockbuild cc_compile_domain : centos.org cc_compile_date : Tue Mar 29 12:15:50 UTC 2016 xend_config_format : 4 [root@localhost ~]# cat /etc/xen/vtpmmgr-stubdom name = "vtpmmgr" kernel="/usr/lib/xen/boot/vtpmmgr-stubdom.gz" memory=16 disk=["file:/srv/xen/vtpmmgr-stubdom.img,hda,w"] iomem=["fed40,5"] [root@localhost ~]# cat /etc/xen/vtpm1 name="vtpm1" kernel="/usr/lib/xen/boot/vtpm-stubdom.gz" memory=8 disk=["file:/srv/xen/vtpm1.img,hda,w"] vtpm=["backend=vtpmmgr,uuid=8aca22b3-768a-41e7-b2cb-123d23901996"] [root@localhost ~]# cat /etc/xen/dom1_ima kernel = "/srv/xen/vmlinuz-xen" ramdisk = "/srv/xen/initrd-xen" name = "dom1" memory = "512" disk = [ 'tap:aio:/srv/xen/dom1.img,xvda1,w' ] vcpus=1 root = '/dev/xvda1 ro' extra = 'ima_tcb' vtpm=['backend=vtpm1'] --001a1134e21855305805352a4a53 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable 
I'm not sure if this is a bug or my fault, but wh=
en I create a domain
with a vTPM attached, detaching it sometimes causes=
 the following error
to be thrown (I post the command sequence):

=
[root@localhost ~]# xl create /etc/xen/vtpmmgr-stubdom
Parsing config fr=
om /etc/xen/vtpmmgr-stubdom
[root@localhost ~]# xl create /etc/xen/vtpm1=

Parsing config from /etc/xen/vtpm1
[root@localhost ~]# xl create /et=
c/xen/dom1_ima
Parsing config from /etc/xen/dom1_ima
[root@localhost =
~]# xl vtpm-detach dom1 vtpm1
[root@localhost ~]# xl destroy dom1
[ro=
ot@localhost ~]# xl vtpm-detach vtpm1 vtpmmgr
libxl: error: libxl_device=
.c:952:device_backend_callback: unable to
remove device with path /local=
/domain/18/backend/vtpm/19/0
libxl: error: libxl.c:1995:device_addrm_aoc=
omplete: unable to remove
vtpm with id 0
libxl_device_vtpm_remove fai=
led.

Sometimes the error is raised while detaching vtpmmgr from vtpm=
 (as
reported), other times while detaching vtpm from domain. I thinkthis could be a synchronization problem.

I report some info:
[root@localhost ~]# xl info
host                   : localhost.localdom=
ain
release                : 3.18.25-19.without_tpm.el7.centos.x86_64version                : #1 SMP Sun Apr 10 18:10:14 CEST 2016
machine  =
              : x86_64
nr_cpus                : 2
max_cpu_id         =
    : 3
nr_nodes               : 1
cores_per_socket       : 2
thre=
ads_per_core       : 1
cpu_mhz                : 2394
hw_caps         =
       : bfebfbff:20100800:00000000:00000900:0408e3fd:00000000:00000001:000=
00000
virt_caps              : hvm hvm_directio
total_memory         =
  : 3996
free_memory            : 2888
sharing_freed_memory   : 0
=
sharing_used_memory    : 0
outstanding_claims     : 0
free_cpus      =
        : 0
xen_major              : 4
xen_minor              : 6
=
xen_extra              : .1-5.el7
xen_version            : 4.6.1-5.el7xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 hv=
m-3.0-x86_32p hvm-3.0-x86_64 
xen_scheduler          : credit
xen_pag=
esize           : 4096
platform_params        : virt_start=3D0xffff80000=
0000000
xen_changeset          : Tue Mar 29 11:02:43 2016 +0100 git:8210=
a62-dirty
xen_commandline        : placeholder dom0_mem=3D1024M,max:1024=
M cpuinfo com1=3D115200,8n1 console=3Dcom1,tty loglvl=3Dall guest_loglvl=3D=
all
cc_compiler            : gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-4)<=
br>cc_compile_by          : mockbuild
cc_compile_domain      : centos.org
cc_compile_date        : Tue Mar 2=
9 12:15:50 UTC 2016
xend_config_format     : 4

[root@localhost ~]=
# cat /etc/xen/vtpmmgr-stubdom 
name =3D "vtpmmgr"
kernel=
=3D"/usr/lib/xen/boot/vtpmmgr-stubdom.gz"
memory=3D16
disk=
=3D["file:/srv/xen/vtpmmgr-stubdom.img,hda,w"]
iomem=3D["=
fed40,5"]

[root@localhost ~]# cat /etc/xen/vtpm1 
name=3D&qu=
ot;vtpm1"
kernel=3D"/usr/lib/xen/boot/vtpm-stubdom.gz"memory=3D8
disk=3D["file:/srv/xen/vtpm1.img,hda,w"]
vtpm=
=3D["backend=3Dvtpmmgr,uuid=3D8aca22b3-768a-41e7-b2cb-123d23901996&quo=
t;]

[root@localhost ~]# cat /etc/xen/dom1_ima 
kernel =3D "/=
srv/xen/vmlinuz-xen"
ramdisk =3D "/srv/xen/initrd-xen"name =3D "dom1"
memory =3D "512"
disk =3D [ '=
;tap:aio:/srv/xen/dom1.img,xvda1,w' ]
vcpus=3D1
root =3D '/de=
v/xvda1 ro'
extra =3D 'ima_tcb'
vtpm=3D['backend=3Dvt=
pm1']

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