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RE: [Xen-devel] xenstore -- read UUID
Hi Derek,
they were 2 seperate questions... sorry for the typos... How to access xenstore from Dom-0? -- which you said 'YES'... And How to access xenstore from hypervosor? Yes.. as you said 'make xen' doesnt include /usr/include libraries and I did check that...
If the hypervisor has no knowledge about XenStore, Dom-0 must have the full control over the xenstore. I need to build a table with some fields one of which should never change during a VMs lifetime. For example, if I chose the domain_id whose value is transient, If the VM reboots, its domain_id changes. That is the reason why I opted for the UUID of a domain that persists over time even after migration to another machine. The only way I could get a domain's UUID is through the xenstore and want to take away domain-0 from the picture, which according to you is almost impossible.
anyway out?
regards, Dinesh C
> Date: Tue, 9 Sep 2008 21:37:57 +0100 > From: Derek.Murray@xxxxxxxxxxxx > To: dinesh_chan8@xxxxxxxxxxx > Subject: Re: [Xen-devel] xenstore -- read UUID > CC: xen-devel@xxxxxxxxxxxxxxxxxxx; xen-users@xxxxxxxxxxxxxxxxxxx > > Hi Dinesh, > > In what context are you trying to run this code? You say that you want > to read the UUID from Dom0, but xen/common/memory.c is part of the > hypervisor (and not Dom0). If you try to compile that code into > xen/common/memory.c, it will fail, because building the hypervisor > does not include the user-space headers (i.e. the contents of > /usr/include/). > > The hypervisor has (almost) no knowledge about XenStore, and so it > would be very difficult to access XenStore from there. However, if you > want to access this information in Dom0, your code should work in a > user-space application. > > Could you provide more details about what you are trying to do? > > Regards, > > Derek Murray. > > On Tue, Sep 9, 2008 at 8:36 PM, dinesh chandrasekaran > <dinesh_chan8@xxxxxxxxxxx> wrote: > > Hi All, > > > > Im trying to read the UUID of a domain-U from domain-0 using the > > following code from inside say xen/common/memory.c. > > > > The include file <xs.h> is present both in /usr/include and > > tools/xenstore/xs.h > > > > #include <xs.h> > > static int get_domain_uuid(unsigned int domain_id) { > > struct xs_handle *xs; > > xs_transaction_t t; > > char *path; > > unsigned int *len; > > void *uuid; > > xs = xs_daemon_open(); > > if (xs == NULL) > > return 1; > > path = xs_get_domain_path(xs, domain_id); > > if (path == NULL) > > return 1; > > strcat (path, '/uuid'); > > len = strlen(path) + 1; > > uuid = xs_read(xs, t, path, len); > > printf('%lx \n', (char) (*uuid)); > > xs_daemon_close(xs); > > free(path); > > return 0; > > } > > > > when compiled throws an error ( xs.h - no such file or directory). > > > > How to access xenstore and read the doamin UUID from dom-0 specifically from > > inside xen/common/memory.c? > > > > regards, > > Dinesh C > > > > ________________________________ > > Voice your opinion on the burning issues of the day. Discuss, debate with > > the world. Logon to message boards on MSN. Try it! > > _______________________________________________ > > Xen-devel mailing list > > Xen-devel@xxxxxxxxxxxxxxxxxxx > > http://lists.xensource.com/xen-devel > > > >
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