Hi
I am new to developing for XEN. I wanted to crate a HVM using xencltr.h
and xenguest.h.. Following is the code I got from while browsing
done by Mark McLoughlin <markmc@redhat.com> and did some modification.
============================================================================================
#include <stdio.h>
#include <xenctrl.h>
#include <xenguest.h>
#define MEM_MB 1024
#define IMAGE "/root/osimages/vmlinuz-2.6.24-19-xen"
#define INITRD NULL
#define CMDLINE ""
#define FEATURES NULL
#define FLAGS 0
int
main(int argc, char **argv)
{
int xc_handle, ret;
uint32_t domid;
unsigned int store_evtchn, console_evtchn;
unsigned long store_mfn, console_mfn;
xen_domain_handle_t uuid = {
0xb2, 0x93, 0x22, 0x1f,
0x1a, 0xaa, 0x20, 0xac,
0xbe, 0x36, 0xc4, 0xd7,
0x6b, 0x73, 0x92, 0x1,
};
xc_handle = xc_interface_open();
if (xc_handle == -1)
{
fprintf(stderr, "xc_interface_open() failed\n");
return 1;
}
domid = 0;
ret = xc_domain_create(xc_handle, 0, uuid, 0, &domid);
if (ret != 0)
{
fprintf(stderr, "xc_dom_linux_build() failed\n");
goto fail;
}
store_evtchn = xc_evtchn_alloc_unbound(xc_handle, domid, 0);
if (store_evtchn < 0)
{
fprintf(stderr, "Failed to allocate xenstore event channel\n");
goto fail;
}
console_evtchn = xc_evtchn_alloc_unbound(xc_handle, domid, 0);
if (console_evtchn < 0)
{
fprintf(stderr, "Failed to allocate console event channel\n");
goto fail;
}
ret = xc_domain_setmaxmem(xc_handle, domid, MEM_MB << 10);
if (ret != 0)
{
fprintf(stderr, "xc_domain_set_maxmem() failed\n");
goto fail;
}
ret = xc_domain_max_vcpus(xc_handle, domid, 1);
if (ret != 0)
{
fprintf(stderr, "xc_domain_max_vcpus() failed\n");
goto fail;
}
/* ret = xc_linux_build(xc_handle, domid,524288,
IMAGE, INITRD,
CMDLINE, FEATURES, FLAGS,
store_evtchn, &store_mfn,
console_evtchn, &console_mfn);
*/
ret = xc_hvm_build(xc_handle, domid, MEM_MB, IMAGE);
if (ret != 0)
{
fprintf(stderr, "xc_dom_linux_build() failed\n");
goto fail;
}
xc_interface_close(xc_handle);
return 0;
fail:
if (domid)
{
xc_evtchn_reset(xc_handle, domid);
xc_domain_destroy(xc_handle, domid);
}
xc_interface_close(xc_handle);
return 1;
}
==============================================================
When running this code I get the following error output
VIRTUAL MEMORY ARRANGEMENT:
Loader: 00000000c0100000->00000000c0503000
TOTAL: 0000000000000000->0000000040000000
ENTRY ADDRESS: 00000000c0100000
Failed allocation for dom 12: 261952 extents of order 0
ERROR Internal error: Could not allocate memory for HVM guest.
(16 = Device or resource busy)
xc_dom_linux_build() failed
Could someone give me some insight to this, also is there any source
codes or documentation that I can find on using low level xen interface..
Thanks
Gihan
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel
On Thu, Oct 02, 2008 at 09:36:47AM +0100, Gihan Munasinghe wrote:> Hi > > I am new to developing for XEN. I wanted to crate a HVM using xencltr.h > and xenguest.h.. Following is the code I got from while browsing > done by Mark McLoughlin <markmc@redhat.com> and did some modification. > ============================================================================================ > > #include <stdio.h> > #include <xenctrl.h> > #include <xenguest.h> > > #define MEM_MB 1024 > #define IMAGE "/root/osimages/vmlinuz-2.6.24-19-xen" > #define INITRD NULL > #define CMDLINE "" > #define FEATURES NULL > #define FLAGS 0 > > int > main(int argc, char **argv) > { > int xc_handle, ret; > uint32_t domid; > unsigned int store_evtchn, console_evtchn; > unsigned long store_mfn, console_mfn; > xen_domain_handle_t uuid = { > 0xb2, 0x93, 0x22, 0x1f, > 0x1a, 0xaa, 0x20, 0xac, > 0xbe, 0x36, 0xc4, 0xd7, > 0x6b, 0x73, 0x92, 0x1, > }; > > xc_handle = xc_interface_open(); > if (xc_handle == -1) > { > fprintf(stderr, "xc_interface_open() failed\n"); > return 1; > } > > domid = 0; > > ret = xc_domain_create(xc_handle, 0, uuid, 0, &domid); > if (ret != 0) > { > fprintf(stderr, "xc_dom_linux_build() failed\n"); > goto fail; > } > > store_evtchn = xc_evtchn_alloc_unbound(xc_handle, domid, 0); > if (store_evtchn < 0) > { > fprintf(stderr, "Failed to allocate xenstore event channel\n"); > goto fail; > } > > console_evtchn = xc_evtchn_alloc_unbound(xc_handle, domid, 0); > if (console_evtchn < 0) > { > fprintf(stderr, "Failed to allocate console event channel\n"); > goto fail; > } > > ret = xc_domain_setmaxmem(xc_handle, domid, MEM_MB << 10); > if (ret != 0) > { > fprintf(stderr, "xc_domain_set_maxmem() failed\n"); > goto fail; > } > > ret = xc_domain_max_vcpus(xc_handle, domid, 1); > if (ret != 0) > { > fprintf(stderr, "xc_domain_max_vcpus() failed\n"); > goto fail; > } > > > /* ret = xc_linux_build(xc_handle, domid,524288, > IMAGE, INITRD, > CMDLINE, FEATURES, FLAGS, > store_evtchn, &store_mfn, > console_evtchn, &console_mfn); > */ > ret = xc_hvm_build(xc_handle, domid, MEM_MB, IMAGE); > if (ret != 0) > { > fprintf(stderr, "xc_dom_linux_build() failed\n"); > goto fail; > } > > > xc_interface_close(xc_handle); > return 0; > > fail: > if (domid) > { > xc_evtchn_reset(xc_handle, domid); > xc_domain_destroy(xc_handle, domid); > } > xc_interface_close(xc_handle); > return 1; > } > ==============================================================> > When running this code I get the following error output > > VIRTUAL MEMORY ARRANGEMENT: > Loader: 00000000c0100000->00000000c0503000 > TOTAL: 0000000000000000->0000000040000000 > ENTRY ADDRESS: 00000000c0100000 > Failed allocation for dom 12: 261952 extents of order 0 > ERROR Internal error: Could not allocate memory for HVM guest. > (16 = Device or resource busy) > xc_dom_linux_build() failed >Looks like you don''t have enough memory on your system to build a 1GB guest domain... It''s trying to allocate 261952 4k pages (i.e. 1GB) and failing. You could reduce MEM_MB or try running your program on a system with more memory. Gary> Could someone give me some insight to this, also is there any source > codes or documentation that I can find on using low level xen interface.. > > Thanks > Gihan > > > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel-- Gary Pennington Solaris Core OS Sun Microsystems Gary.Pennington@sun.com _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Gary Pennington wrote:> On Thu, Oct 02, 2008 at 09:36:47AM +0100, Gihan Munasinghe wrote: > >> Hi >> >> I am new to developing for XEN. I wanted to crate a HVM using xencltr.h >> and xenguest.h.. Following is the code I got from while browsing >> done by Mark McLoughlin <markmc@redhat.com> and did some modification. >> ============================================================================================ >> >> #include <stdio.h> >> #include <xenctrl.h> >> #include <xenguest.h> >> >> #define MEM_MB 1024 >> #define IMAGE "/root/osimages/vmlinuz-2.6.24-19-xen" >> #define INITRD NULL >> #define CMDLINE "" >> #define FEATURES NULL >> #define FLAGS 0 >> >> int >> main(int argc, char **argv) >> { >> int xc_handle, ret; >> uint32_t domid; >> unsigned int store_evtchn, console_evtchn; >> unsigned long store_mfn, console_mfn; >> xen_domain_handle_t uuid = { >> 0xb2, 0x93, 0x22, 0x1f, >> 0x1a, 0xaa, 0x20, 0xac, >> 0xbe, 0x36, 0xc4, 0xd7, >> 0x6b, 0x73, 0x92, 0x1, >> }; >> >> xc_handle = xc_interface_open(); >> if (xc_handle == -1) >> { >> fprintf(stderr, "xc_interface_open() failed\n"); >> return 1; >> } >> >> domid = 0; >> >> ret = xc_domain_create(xc_handle, 0, uuid, 0, &domid); >> if (ret != 0) >> { >> fprintf(stderr, "xc_dom_linux_build() failed\n"); >> goto fail; >> } >> >> store_evtchn = xc_evtchn_alloc_unbound(xc_handle, domid, 0); >> if (store_evtchn < 0) >> { >> fprintf(stderr, "Failed to allocate xenstore event channel\n"); >> goto fail; >> } >> >> console_evtchn = xc_evtchn_alloc_unbound(xc_handle, domid, 0); >> if (console_evtchn < 0) >> { >> fprintf(stderr, "Failed to allocate console event channel\n"); >> goto fail; >> } >> >> ret = xc_domain_setmaxmem(xc_handle, domid, MEM_MB << 10); >> if (ret != 0) >> { >> fprintf(stderr, "xc_domain_set_maxmem() failed\n"); >> goto fail; >> } >> >> ret = xc_domain_max_vcpus(xc_handle, domid, 1); >> if (ret != 0) >> { >> fprintf(stderr, "xc_domain_max_vcpus() failed\n"); >> goto fail; >> } >> >> >> /* ret = xc_linux_build(xc_handle, domid,524288, >> IMAGE, INITRD, >> CMDLINE, FEATURES, FLAGS, >> store_evtchn, &store_mfn, >> console_evtchn, &console_mfn); >> */ >> ret = xc_hvm_build(xc_handle, domid, MEM_MB, IMAGE); >> if (ret != 0) >> { >> fprintf(stderr, "xc_dom_linux_build() failed\n"); >> goto fail; >> } >> >> >> xc_interface_close(xc_handle); >> return 0; >> >> fail: >> if (domid) >> { >> xc_evtchn_reset(xc_handle, domid); >> xc_domain_destroy(xc_handle, domid); >> } >> xc_interface_close(xc_handle); >> return 1; >> } >> ==============================================================>> >> When running this code I get the following error output >> >> VIRTUAL MEMORY ARRANGEMENT: >> Loader: 00000000c0100000->00000000c0503000 >> TOTAL: 0000000000000000->0000000040000000 >> ENTRY ADDRESS: 00000000c0100000 >> Failed allocation for dom 12: 261952 extents of order 0 >> ERROR Internal error: Could not allocate memory for HVM guest. >> (16 = Device or resource busy) >> xc_dom_linux_build() failed >> >> > > Looks like you don''t have enough memory on your system to build a 1GB > guest domain... > > It''s trying to allocate 261952 4k pages (i.e. 1GB) and failing. You > could reduce MEM_MB or try running your program on a system with more > memory. >I am running this code in a machine with has 8GB of ram.. But when I look at though virt-manager it says dom0 is using 8GB. I think that may be the problem. Is there any XEn setting or code change I need to do get the ram back off dom0 Thanks Gihan> Gary > > >> Could someone give me some insight to this, also is there any source >> codes or documentation that I can find on using low level xen interface.. >> >> Thanks >> Gihan >> >> >> >> >> _______________________________________________ >> Xen-devel mailing list >> Xen-devel@lists.xensource.com >> http://lists.xensource.com/xen-devel >> > >_______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
> I am running this code in a machine with has 8GB of ram.. But when I look > at though virt-manager it says dom0 is using 8GB. I think that may be the > problem. Is there any XEn setting or code change I need to do get the ram > back off dom0echo <memsize> >/proc/xen/balloon _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel