Pkg xen devel - Oct 2012 - Bug#689646: xen-utils-4.1: fails to create HVM domU

Package: xen-utils-4.1
Version: 4.1.3-2
Severity: important

Dear Maintainer,

Creating a new HVM domU fails with the following error:
map shared IO page returned error 22

I've narrowed it down to qemu-dm which fails to start:
# /usr/lib/xen-4.1/bin/qemu-dm
[...]
qemu_map_cache_init nr_buckets = 10000 size 4194304
errno0 = 2
domid = -1
shared page at pfn 0
errno1 = 3
errno2 = 22
map shared IO page returned error 22

I added some errno debug then rebuilt and reinstalled the package using apt-src,
here is the diff:
diff --git a/qemu/hw/xen_machine_fv.c b/qemu/hw/xen_machine_fv.c
index a353ee6..fe7a914 100644
--- a/qemu/hw/xen_machine_fv.c
+++ b/qemu/hw/xen_machine_fv.c
@@ -297,10 +297,14 @@ static void xen_init_fv(ram_addr_t ram_size, int
vga_ram_size,
 #ifdef CONFIG_STUBDOM /* the hvmop is not supported on older hypervisors */
     xc_set_hvm_param(xc_handle, domid, HVM_PARAM_DM_DOMAIN, DOMID_SELF);
 #endif
+    fprintf(logfile, "errno0 = %d\n", errno);
+    fprintf(logfile, "domid = %d\n", domid);
     xc_get_hvm_param(xc_handle, domid, HVM_PARAM_IOREQ_PFN, &ioreq_pfn);
     fprintf(logfile, "shared page at pfn %lx\n", ioreq_pfn);
+    fprintf(logfile, "errno1 = %d\n", errno);
     shared_page = xc_map_foreign_range(xc_handle, domid, XC_PAGE_SIZE,
                                        PROT_READ|PROT_WRITE, ioreq_pfn);
+    fprintf(logfile, "errno2 = %d\n", errno);
     if (shared_page == NULL) {
         fprintf(logfile, "map shared IO page returned error %d\n",
errno);
         exit(-1);

It seems the root issue is ioreq_pfn which is zero but I'm not sure where to
go from here.

-- System Information:
Debian Release: wheezy/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 3.2.0-3-amd64 (SMP w/8 CPU cores)
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Shell: /bin/sh linked to /bin/dash

Versions of packages xen-utils-4.1 depends on:
ii  e2fslibs          1.42.5-1
ii  libc6             2.13-35
ii  libgnutls26       2.12.20-1
ii  libncurses5       5.9-10
ii  libpci3           1:3.1.9-5
ii  libtinfo5         5.9-10
ii  libuuid1          2.20.1-5.2
ii  libxen-4.1        4.1.3-2
ii  libxenstore3.0    4.1.3-2
ii  python            2.7.3~rc2-1
ii  python2.7         2.7.3~rc2-2.1
ii  xen-utils-common  4.1.3-2
ii  zlib1g            1:1.2.7.dfsg-13

Versions of packages xen-utils-4.1 recommends:
ii  bridge-utils                                   1.5-4
ii  qemu-keymaps                                   1.1.2+dfsg-2
ii  qemu-utils                                     1.1.2+dfsg-2
ii  xen-hypervisor-4.1-amd64 [xen-hypervisor-4.1]  4.1.3-2

Versions of packages xen-utils-4.1 suggests:
ii  xen-docs-4.1  4.1.3-2

-- no debconf information

On Thu, 2012-10-04 at 19:56 +0200, Infertux wrote:
> Creating a new HVM domU fails with the following error:
> map shared IO page returned error 22
How are you creating the domain? Please can you supply the config file
you are using and the actual commands you are running.

The interesting logs are likely to be under /var/log/xen.
> I've narrowed it down to qemu-dm which fails to start:
> # /usr/lib/xen-4.1/bin/qemu-dm
You can't just run qemu bare like that, it needs the toolstack to have
created the shell of the domain and to pass the correct options. The
fact that it appears to produce the same error message is probably a
coincidence.

Ian.

-- 
Ian Campbell


I'm a soldier, not a diplomat.  I can only tell the truth.
		-- Kirk, "Errand of Mercy", stardate 3198.9

Package: xen-utils-4.1
Version: 4.1.3-2
Followup-For: Bug #689646

On Thu, 2012-10-04 at 19:35 +0100, Ian Campbell wrote:
> How are you creating the domain? Please can you supply the config file
> you are using and the actual commands you are running.
# xl create /etc/xen/hvm.cfg
Parsing config file /etc/xen/hvm.cfg
libxl: error: libxl_dom.c:287:libxl__build_hvm hvm building failed
[FYI, it hangs for about 5 seconds here before giving up with the next two
lines]
libxl: error: libxl_device.c:470:libxl__wait_for_device_model Device Model not
ready
xl: fatal error: libxl_create.c:535, rc=-1: libxl__confirm_device_model_startup

I'm attaching the config file.
> The interesting logs are likely to be under /var/log/xen.
# cat /var/log/xen/qemu-dm-hvm.log
domid: 17
-videoram option does not work with cirrus vga device model. Videoram set to 4M.
qemu: ignoring not-understood drive `xvda2'
qemu: ignoring not-understood drive `xvda1'
Watching /local/domain/0/device-model/17/logdirty/cmd
Watching /local/domain/0/device-model/17/command
Watching /local/domain/17/cpu
qemu_map_cache_init nr_buckets = 10000 size 4194304
shared page at pfn 0
map shared IO page returned error 22
-------------- next part --------------
kernel = 'hvmloader'
builder = 'hvm'
device_model = 'qemu-dm'
kernel      = '/boot/vmlinuz-3.2.0-3-amd64'
ramdisk     = '/boot/initrd.img-3.2.0-3-amd64'
vcpus       = '2'
memory      = '512'
root        = '/dev/xvda2 ro'
name        = 'hvm'
disk        = [
                  'file:/srv/xen/hvm/domains/hvm/disk.img,xvda2,w',
                  'file:/srv/xen/hvm/domains/hvm/swap.img,xvda1,w',
              ]
on_poweroff = 'destroy'
on_reboot   = 'restart'
on_crash    = 'restart'

On Thu, 2012-10-04 at 22:55 +0200, Infertux wrote:
> Package: xen-utils-4.1
> Version: 4.1.3-2
> Followup-For: Bug #689646
> 
> On Thu, 2012-10-04 at 19:35 +0100, Ian Campbell wrote:
> > How are you creating the domain? Please can you supply the config file
> > you are using and the actual commands you are running.
> 
> # xl create /etc/xen/hvm.cfg
> Parsing config file /etc/xen/hvm.cfg
Your config file is a strange mix of PV and HVM-isms, has it ever worked
for you with any toolstack?

You have kernel = hvmloader and builder = hvm (both HVM-isms) but then
you specify specific kernels (overriding the hvmloader case) and ramdisk
(PV-isms) and use a split disk layout (also a PV-ism).

Ian.
-- 
Ian Campbell


I B M
U B M
We all B M
For I B M!!!!
		-- H.A.R.L.I.E.

Package: xen-utils-4.1
Followup-For: Bug #689646

On Thu, 2012-10-05 at 08:07 +0100, Ian Campbell wrote:
> Your config file is a strange mix of PV and HVM-isms, has it ever worked
> for you with any toolstack?
> 
> You have kernel = hvmloader and builder = hvm (both HVM-isms) but then
> you specify specific kernels (overriding the hvmloader case) and ramdisk
> (PV-isms) and use a split disk layout (also a PV-ism).
Indeed, I don't know where this file comes from in the first place but
it works like a charm with a decent config.

You can safely close this bug report, sorry for the noise.

Cheers.

Your message dated Fri, 05 Oct 2012 17:41:15 +0100
with message-id <1349455275.20946.145.camel at zakaz.uk.xensource.com>
and subject line Re: Bug#689646: xen-utils-4.1: fails to create HVM domU
has caused the Debian Bug report #689646,
regarding xen-utils-4.1: fails to create HVM domU
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner at bugs.debian.org
immediately.)


-- 
689646: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=689646
Debian Bug Tracking System
Contact owner at bugs.debian.org with problems
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