Re: [Xen-devel] xenstore documentation

[Anthony Liguori <aliguori@xxxxxxxxxx>]

Jacob Gorm Hansen wrote:

> hi Anthony, others
>
> I have converted your pseudocode to C, but I am still not able to
> connect the device. I hope it's OK that I attach my code that I have
> trouble getting working, if anyone could try to run it or comment if
> anything obvious looks wrong.
>
> The two files are businit.c and buscreate.c. The former inits xenstore
> and dom0, and the latter creates a domU and attempts to connect hda1.
>  
I'll run play with it tomorrow.  Some people are having problems with 
block devices timing out.  You should verify you can create a domain 
with a block device with Xend to determine if it's your platform.
Regards,

Anthony Liguori

> Thanks,
> Jacob
>  
>
> ------------------------------------------------------------------------
>
> #include <xenctrl.h>
> #include <xenguest.h>
>
> #include <stdio.h>
> #include <errno.h>
> #include <stdlib.h>
> #include <string.h>
>
> #include <xs.h>
> #include <fcntl.h>
>
>
> int main(int argc,char** argv)
> {
>         int xc = xc_interface_open();
>         struct xs_handle *xs = xs_daemon_open();
>         char home[] = "/local/domain/0";
>
>         int lstore = 0;
>         int rstore = 0;
>
>         xc_evtchn_bind_interdomain(xc, 0, 0, &lstore, &rstore);
>         unsigned long mfn_store = xc_init_store(xc, rstore);
>         xs_mkdir(xs,home);
>         xs_introduce_domain(xs, 0, mfn_store, lstore, home);
>
>         return 0;
>
> }
>
>  
>
> ------------------------------------------------------------------------
>
> #include <xenctrl.h>
> #include <xenguest.h>
>
> #include <stdio.h>
> #include <errno.h>
> #include <stdlib.h>
> #include <string.h>
>
> #include <xs.h>
> #include <fcntl.h>
>
>
> #define xs_write(a,b,c,d) printf("write %s <- %s : %d\n", 
> b,c,xs_write(a,b,c,d));
> #define xs_transaction_end(a,b) printf("end : %d\n", xs_transaction_end(a,b));
> int main(int argc,char** argv)
> {
>         int xc = xc_interface_open();
>         struct xs_handle *xs = xs_daemon_open();
>         
>         char kernel[] = "/vmlinux";
>         char ramdisk[] = "/domUinitrd";
>         char cmdline[] = "init=/linuxrc root=/dev/ram";
>         char pdev[] = "0x301";
>         char vdev[] = "0x301";
>         int vcpus = 1;
>         char home[256];
>
>         unsigned long memory = 64*1024*1024;
>
>         int domid = 0;
>         xc_domain_create(xc, ACM_DEFAULT_SSID, &domid);
>         xc_domain_setmaxmem(xc,domid, memory >> 10);
>         xc_domain_memory_increase_reservation(xc,domid, memory >> 12, 0,0,0);
>
>         // 2) Build domain
>         int lconsole = 0;
>         int rconsole = 0;
>         int lstore = 0;
>         int rstore = 0;
>         unsigned long mfn_store, mfn_console;
>
>         xc_evtchn_bind_interdomain(xc, 0, domid, &lconsole, &rconsole);
>         xc_evtchn_bind_interdomain(xc, DOMID_SELF, domid, &lstore, &rstore);
>
>         xc_linux_build(xc, domid, kernel, ramdisk, cmdline, 0, vcpus,
>                         rstore, &mfn_store, rconsole, &mfn_console);
>
>         sprintf(home,"/local/domain/%d",domid);
>         xs_introduce_domain(xs, domid, mfn_store, lstore, home);
>
>         char s[256];
>         char s2[256];
>
>         sprintf(s,"%s/console/ring-ref",home);
>         sprintf(s2,"%lu",mfn_console);
>         xs_write(xs, s, s2, strlen(s2));
>
>         sprintf(s,"%s/console/port",home);
>         sprintf(s2,"%d",lconsole);
>         xs_write(xs, s, s2, strlen(s2));
>
>         // 3) Create block device (pdev, vdev);
>         int uuid = 1000 + domid;
>
>         char* dom0_home = xs_get_domain_path(xs,0);
>         printf("dom0_home is %s\n",dom0_home);
>
>         char backend[256];
>         char frontend[256];
>         sprintf(backend,"%s/backend/vbd/%d/%d",dom0_home,uuid,domid);
>         sprintf(frontend, "%s/device/vbd/%d",home,uuid);
>
>
>         xs_transaction_start(xs);
>         sprintf(s,"%s/frontend",backend);
>         xs_write(xs, s, frontend, strlen(frontend));
>
>         sprintf(s,"%s/frontend-id",backend);
>         sprintf(s2,"%d",domid);
>         xs_write(xs, s, s2, strlen(s2));
>         xs_transaction_end(xs,0);
>
>
>         xs_transaction_start(xs);
>         sprintf(s,"%s/backend",frontend);
>         xs_write(xs, s, backend, strlen(backend));
>
>         sprintf(s, "%s/backend-id", frontend);
>         xs_write(xs, s, "0",1);
>         
>         sprintf(s, "%s/virtual-device", frontend);
>         xs_write(xs, s, vdev, strlen(vdev));
>         xs_transaction_end(xs,0);
>
>
>
>         sprintf(s, "%s/physical-device",backend);
>         xs_write(xs, s, pdev, strlen(pdev));
>
>         xc_domain_unpause(xc,domid);
>
>         return 0;
> }
>  
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