RE: [Xen-devel] ctxt->pt_base != 0 when creating a new domain

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

This is fixed in the latest unstable tree -- it got introduced over the
weekend by the re-organisation of struct exec_domain and struct domain.

Ian

> -----Original Message-----
> From: xen-devel-admin@xxxxxxxxxxxxxxxxxxxxx 
> [mailto:xen-devel-admin@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Felipe Alfaro Solana
> Sent: 07 February 2005 13:58
> To: xen-devel
> Subject: [Xen-devel] ctxt->pt_base != 0 when creating a new domain
> 
> Hi!
> 
> Since upgrading to the latest bkbits from xeno-unstable, I'm unable to
> create a XenU domain I was previously able to create with no problems
> at all:
> 
> # xm list
> Name              Id  Mem(MB)  CPU  State  Time(s)  Console
> Domain-0           0      414    0  r----     23.4        
> 
> # xm create xenU
> Using config file "xenU"
> Error: Error creating domain: (0, 'Error')
> 
> # cat /var/log/xend-debug.log
> network start bridge=xen-br0 netdev=eth1 antispoof=no
> ERROR: Domain is already constructed
> op_create> Exception creating domain:
> Traceback (most recent call last):
>   File "/usr/lib/python/xen/xend/server/SrvDomainDir.py", 
> line 66, in op_create
>     deferred = self.xd.domain_create(config)
>   File "/usr/lib/python/xen/xend/XendDomain.py", line 357, in 
> domain_create
>     deferred = XendDomainInfo.vm_create(config)
>   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 
> 195, in vm_create
>     ptr = vm.construct(config)
>   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 
> 469, in construct
>     self.construct_image()
>   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 503, in
> construct_image
>     self.image_handler(self, image)
>   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 1137, in
> vm_image_linux
>     vm.create_domain("linux", kernel, ramdisk, cmdline)
>   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 
> 809, in create_domain
>     self.build_domain(ostype, kernel, ramdisk, cmdline, memmap)
>   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 
> 789, in build_domain
>     vcpus          = self.vcpus)
> error: (0, 'Error')
> 
> I have made the following testcase patch:
> 
> --- tools/libxc/xc_linux_build.c.old    2005-02-07 
> 13:49:57.000000000 +0100
> +++ tools/libxc/xc_linux_build.c        2005-02-07 
> 14:45:35.242555000 +0100
> @@ -360,46 +360,51 @@
>              goto error_out;
>          }
>      }
>  
>      if ( mlock(&st_ctxt, sizeof(st_ctxt) ) )
>      {   
>          PERROR("Unable to mlock ctxt");
>          return 1;
>      }
>  
>      op.cmd = DOM0_GETDOMAININFO;
>      op.u.getdomaininfo.domain = (domid_t)domid;
>      op.u.getdomaininfo.exec_domain = 0;
>      op.u.getdomaininfo.ctxt = ctxt;
>      if ( (do_dom0_op(xc_handle, &op) < 0) || 
>           ((u16)op.u.getdomaininfo.domain != domid) )
>      {
>          PERROR("Could not get info on domain");
>          goto error_out;
>      }
> +#if 1
>      if ( !(op.u.getdomaininfo.flags & DOMFLAGS_PAUSED) ||
>           (ctxt->pt_base != 0) )
>      {
> -               ERROR("Domain is already constructed");
> +       if (!(op.u.getdomaininfo.flags & DOMFLAGS_PAUSED))
> +               ERROR("Cannot create an unpaused domain");
> +       else
> +               ERROR("Domain is already constructed or 
> ctxt->pt_base != 0");
>          goto error_out;
>      }
> +#endif
>  
>      if ( setup_guestos(xc_handle, domid, image, image_size, 
>                         initrd_gfd, initrd_size, nr_pages, 
>                         &vstartinfo_start, &vkern_entry,
>                         ctxt, cmdline,
>                         op.u.getdomaininfo.shared_info_frame,
>                         control_evtchn, flags, vcpus) < 0 )
>      {
>          ERROR("Error constructing guest OS");
>          goto error_out;
>      }
>  
>      if ( initrd_fd >= 0 )
>          close(initrd_fd);
>      if ( initrd_gfd )
>          gzclose(initrd_gfd);
>      if ( image != NULL )
>          free(image);
>  
>      ctxt->flags = 0;
> 
> 
> After applying the previous patch, rebuilnding and rebooting, this is
> what gets logged into xend-debug.log:
> 
> # cat /var/log/xend-debug.log
> network start bridge=xen-br0 netdev=eth1 antispoof=no
> ERROR: Domain is already constructed or ctxt->pt_base != 0
> op_create> Exception creating domain:
> Traceback (most recent call last):
>   File "/usr/lib/python/xen/xend/server/SrvDomainDir.py", 
> line 66, in op_create
>     deferred = self.xd.domain_create(config)
>   File "/usr/lib/python/xen/xend/XendDomain.py", line 357, in 
> domain_create
>     deferred = XendDomainInfo.vm_create(config)
>   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 
> 195, in vm_create
>     ptr = vm.construct(config)
>   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 
> 469, in construct
>     self.construct_image()
>   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 503, in
> construct_image
>     self.image_handler(self, image)
>   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 1137, in
> vm_image_linux
>     vm.create_domain("linux", kernel, ramdisk, cmdline)
>   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 
> 809, in create_domain
>     self.build_domain(ostype, kernel, ramdisk, cmdline, memmap)
>   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 
> 789, in build_domain
>     vcpus          = self.vcpus)
> error: (0, 'Error')
> 
> This reveals that, for some misterious reason, the condition
> "ctxt->pt_base != 0" evaluates TRUE. Why is this happening? What's
> more, replacing the "#if 1" with an "#if 0" fixes the problem for me:
> the domain is created and works properly.
> 
> Any ideas?
> 
> 
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