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 code works for me.

Can you be more specific about what error you are seeing and what 
changeset you are on?  It works just fine on my snapshot from Monday.
Regards,

Anthony Liguori

> 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.
>
> 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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