Re: [Xen-devel] Problem with Xen headerfiles

[Wei Liu <wei.liu2@xxxxxxxxxx>]

As you're writing a user space program you should only include public
headers installed in your system. Including internal header files of Xen
will not work.


Wei.

On Tue, Jul 02, 2013 at 12:09:41PM +0430, Mina Jafari wrote:
> Hi all,
> I'm trying to compile this program to map domu's page. But it returns
> errors that can't find headerfiles!
> 
>  *gcc -c map_page.c -I/***/xen/xen-4.1.2/xen/include -lxenctrl  -o
> map_page.o*
> *In file included from
> /home/ossl5/xen/xen-4.1.2original/xen/include/asm/smp.h:16:0,
>                  from
> /home/ossl5/xen/xen-4.1.2original/xen/include/xen/smp.h:5,
>                  from
> /home/ossl5/xen/xen-4.1.2original/xen/include/xen/sched.h:8,
>                  from /usr/include/xenctrl.h:43,
>                  from map_page.c:2:
> /home/ossl5/xen/xen-4.1.2original/xen/include/asm-x86/mpspec.h:6:25: fatal
> error: mach_mpspec.h: No such file or directory
> compilation terminated.
> *
> 
> And as I see this file isn't really located in this directory. I modified
> the path included, and compile it again. This time returned error about not
> finding another headerfile and "previous declaration"!
> 
>  *gcc -I/***/xen/xen-4.1.2original/xen/include -lxenctrl  map_page.c -o
> map_page.o
> In file included from
> /***/xen/xen-4.1.2original/xen/include/xen/sched.h:9:0,
>                  from /usr/include/xenctrl.h:43,
>                  from map_page.c:2:
> /***/xen/xen-4.1.2original/xen/include/xen/shared.h:13:3: error:
> conflicting types for âshared_info_tâ
> In file included from /usr/include/xenctrl.h:37:0,
>                  from map_page.c:2:
> /usr/include/xen/xen.h:537:28: note: previous declaration of
> âshared_info_tâ was here
> In file included from
> /***/xen/xen-4.1.2original/xen/include/xen/sched.h:9:0,
>                  from /usr/include/xenctrl.h:43,
>                  from map_page.c:2:
> /***/xen/xen-4.1.2original/xen/include/xen/shared.h:28:3: error:
> conflicting types for âvcpu_info_tâ
> In file included from /usr/include/xenctrl.h:37:0,
>                  from map_page.c:2:
> /usr/include/xen/xen.h:477:26: note: previous declaration of âvcpu_info_tâ
> was here
> In file included from
> /***/xen/xen-4.1.2original/xen/include/xen/hvm/irq.h:28:0,
>                  from
> /***/xen/xen-4.1.2original/xen/include/asm/hvm/irq.h:25,
>                  from
> /***/xen/xen-4.1.2original/xen/include/asm/hvm/vpt.h:32,
>                  from
> /***/xen/xen-4.1.2original/xen/include/asm/hvm/vlapic.h:27,
>                  from
> /***/xen/xen-4.1.2original/xen/include/asm/hvm/vcpu.h:25,
>                  from /***/xen/xen-4.1.2original/xen/include/asm/domain.h:6,
>                  from /***/xen/xen-4.1.2original/xen/include/xen/domain.h:6,
>                  from /***/xen/xen-4.1.2original/xen/include/xen/sched.h:19,
>                  from /usr/include/xenctrl.h:43,
>                  from map_page.c:2:
> /***/xen/xen-4.1.2original/xen/include/asm/irq.h:10:25: fatal error:
> irq_vectors.h: No such file or directory
> compilation terminated.*
> 
> Am I compiling it in a wrong way that it couldn't find headerfiles?
> 
> Here is my program "map_page.c" located in xen directory.
> *
> #include <stdio.h>
> #include <xenctrl.h>
> #include <xs_api.h>
> #include <asm-x86/current.h>
> #include <xen/sched.h>
> 
> 
> typedef unsigned long long guest_word_t;
> 
> int main()
> {
> 
>     vcpu_guest_context_any_t *vcpu_ctx_any;
>     int vcpu = 0;
>     int ret = 0 ;
>     xc_interface *xch = 0;
>     char *domid = 0;
>     char *buffer;
>     guest_word_t virt;
> 
> 
> 
> 
>     struct xs_handle *h = xs_daemon_open();
>     xch = xc_interface_open(0,0,0);
>      if (xc_handle < 0) {
>                 printf ("error : xc_interface_open");
>                 exit (-1);
>             }
> 
>     domid = get_dom_domid (h);
>     //typedef struct vcpu *current_vcpu = get_cpu_info()->current_vcpu;
>     //vcpu = current_vcpu.vcpu_id;
>     vcpu_setcontext (vcpu);
>     buffer = (char)map_page(vcpu_ctx_any,vcpu,virt);
> 
> 
>     xc_interface_close(xch);
>     return(0);
> }
> 
> 
> 
> static void *map_page(vcpu_guest_context_any_t *ctx, int vcpu, guest_word_t
> virt)
> {
>     static unsigned long previous_mfn = 0;
>     static void *mapped = NULL;
> 
>     unsigned long mfn = xc_translate_foreign_address(xc_handle, domid,
> vcpu, virt);
>     unsigned long offset = virt & ~XC_PAGE_MASK;
> 
>     if (mapped && mfn == previous_mfn)
>         goto out;
> 
>     if (mapped)
>         munmap(mapped, XC_PAGE_SIZE);
> 
>     previous_mfn = mfn;
> 
>     mapped = xc_map_foreign_range(xc_handle, domid, XC_PAGE_SIZE, 0, mfn);
> 
>     if (mapped == NULL) {
>         fprintf(stderr, "failed to map page.\n");
>         exit(-1);
>     }
> 
>  out:
>     return (void *)(mapped + offset);
> }
> *

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