no such file or directory

no such file or directory

[lijiandm]

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 hello list:
 I add some code to xen-3.1.0-src\xen\arch\x86\hvm\vmx\vmx.c  to export some information when vmx_vmexit_handler() executed:
-------------------------------------------------------------------------------------------------
 --- vmx.c 2007-05-18 22:45:22.000000000 +0800
+++ vmx-patch.c 2008-11-24 14:19:18.000000000 +0800
@@ -50,7 +50,9 @@
 #include <asm/hvm/vpt.h>
 #include <public/hvm/save.h>
 #include <asm/hvm/trace.h>
-
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
 char *vmx_msr_bitmap;
 
 static void vmx_ctxt_switch_from(struct vcpu *v);
@@ -2590,9 +2592,13 @@
     unsigned int exit_reason;
     unsigned long exit_qualification, inst_len = 0;
     struct vcpu *v = current;
+ int test;
+ unsigned long FS_SELECTOR,FS_LIMIT,FS_AR_BYTES,FS_BASE,CR3;
+ FILE *fp;
+ char a='\n',b='%';
 
     exit_reason = __vmread(VM_EXIT_REASON);
-
+ 
     HVMTRACE_2D(VMEXIT, v, __vmread(GUEST_RIP), exit_reason);
 
     perfc_incra(vmexits, exit_reason);
@@ -2711,6 +2717,27 @@
     }
     case EXIT_REASON_CR_ACCESS:
     {
+  FS_SELECTOR=(unsigned long)__vmread(EXIT_QUALIFICATION);
+  FS_LIMIT=(unsigned long)__vmread(EXIT_QUALIFICATION);
+  FS_AR_BYTES=(unsigned long)__vmread(EXIT_QUALIFICATION);
+  FS_BASE=(unsigned long)__vmread(EXIT_QUALIFICATION);
+  CR3=(unsigned long)__vmread(EXIT_QUALIFICATION);
+
+  fp=fopen("/home/a.txt","a+");
+
+  fwrite(&FS_SELECTOR,sizeof(unsigned long),1,fp);
+  fwrite(&b,sizeof(char),1,fp);
+  fwrite(&FS_LIMIT,sizeof(unsigned long),1,fp);
+  fwrite(&b,sizeof(char),1,fp);
+  fwrite(&FS_AR_BYTES,sizeof(unsigned long),1,fp);
+  fwrite(&b,sizeof(char),1,fp);
+  fwrite(&FS_BASE,sizeof(unsigned long),1,fp);
+  fwrite(&b,sizeof(char),1,fp);
+  fwrite(&CR3,sizeof(unsigned long),1,fp);
+  fwrite(&a,sizeof(char),1,fp);
+
+  fclose(fp);
+
         exit_qualification = __vmread(EXIT_QUALIFICATION);
         inst_len = __get_instruction_length(); /* Safe: MOV Cn, LMSW, CLTS */
         if ( vmx_cr_access(exit_qualification, regs) )
-----------------------------------------------------------------------------------------------------
 
but when I compiled the xen,the error occured:

vmx.c:53:19: 错误：stdio.h：No such file or directory
vmx.c:54:20: 错误：stdlib.h：No such file or directory
vmx.c:55:20: 错误：unistd.h：No such file or directory
 
How can I slove this problem?
Thanks.

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Re: no such file or directory

[Paul Samon]

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Oh, no... You can not use C's standard IO library in Xen at all.
For example,  Xen has no knowledge about the file system at all, so it
can't understand a file path "/home/a.txt" at all.

By a serial cable, you can use printk() to output the info you need(if
you have no a cable at hand, check the "xm dmesg" in Dom0), or use
some relatively complex methods to export the data in Xen to Dom0's
userspace.

-- Paul. S.

2008/11/23 lijiandm <lijiandm@163.com>:
>  hello list:
>  I add some code to xen-3.1.0-src\xen\arch\x86\hvm\vmx\vmx.c  to export some
> information when vmx_vmexit_handler() executed:
> -------------------------------------------------------------------------------------------------
>  --- vmx.c 2007-05-18 22:45:22.000000000 +0800
> +++ vmx-patch.c 2008-11-24 14:19:18.000000000 +0800
> @@ -50,7 +50,9 @@
>  #include <asm/hvm/vpt.h>
>  #include <public/hvm/save.h>
>  #include <asm/hvm/trace.h>
> -
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <unistd.h>
>  char *vmx_msr_bitmap;
>
>  static void vmx_ctxt_switch_from(struct vcpu *v);
> @@ -2590,9 +2592,13 @@
>      unsigned int exit_reason;
>      unsigned long exit_qualification, inst_len = 0;
>      struct vcpu *v = current;
> + int test;
> + unsigned long FS_SELECTOR,FS_LIMIT,FS_AR_BYTES,FS_BASE,CR3;
> + FILE *fp;
> + char a='\n',b='%';
>
>      exit_reason = __vmread(VM_EXIT_REASON);
> -
> +
>      HVMTRACE_2D(VMEXIT, v, __vmread(GUEST_RIP), exit_reason);
>
>      perfc_incra(vmexits, exit_reason);
> @@ -2711,6 +2717,27 @@
>      }
>      case EXIT_REASON_CR_ACCESS:
>      {
> +  FS_SELECTOR=(unsigned long)__vmread(EXIT_QUALIFICATION);
> +  FS_LIMIT=(unsigned long)__vmread(EXIT_QUALIFICATION);
> +  FS_AR_BYTES=(unsigned long)__vmread(EXIT_QUALIFICATION);
> +  FS_BASE=(unsigned long)__vmread(EXIT_QUALIFICATION);
> +  CR3=(unsigned long)__vmread(EXIT_QUALIFICATION);
> +
> +  fp=fopen("/home/a.txt","a+");
> +
> +  fwrite(&FS_SELECTOR,sizeof(unsigned long),1,fp);
> +  fwrite(&b,sizeof(char),1,fp);
> +  fwrite(&FS_LIMIT,sizeof(unsigned long),1,fp);
> +  fwrite(&b,sizeof(char),1,fp);
> +  fwrite(&FS_AR_BYTES,sizeof(unsigned long),1,fp);
> +  fwrite(&b,sizeof(char),1,fp);
> +  fwrite(&FS_BASE,sizeof(unsigned long),1,fp);
> +  fwrite(&b,sizeof(char),1,fp);
> +  fwrite(&CR3,sizeof(unsigned long),1,fp);
> +  fwrite(&a,sizeof(char),1,fp);
> +
> +  fclose(fp);
> +
>          exit_qualification = __vmread(EXIT_QUALIFICATION);
>          inst_len = __get_instruction_length(); /* Safe: MOV Cn, LMSW, CLTS
> */
>          if ( vmx_cr_access(exit_qualification, regs) )
> -----------------------------------------------------------------------------------------------------
>
> but when I compiled the xen,the error occured:
> vmx.c:53:19: 错误：stdio.h：No such file or directory
> vmx.c:54:20: 错误：stdlib.h：No such file or directory
> vmx.c:55:20: 错误：unistd.h：No such file or directory
>
> How can I slove this problem?
> Thanks.

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Re: Re: no such file or directory

[Paul Samon]

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Do you need to export plenty of data of Xen? If not, I think using
printk() or debugtrace_printk() is the best choice.
If you really have much data to export, I think you can look into how
"xm dmesg" or xentrace is implemented.

--  Paul. S.

2008/11/23 lijiandm <lijiandm@163.com>:
> "use some relatively complex methods to export the data in Xen to Dom0's
> userspace."
> What's the complex methods ?Can you give me some suggestion?
> Thanks.
>
>
> 在2008-11-24，"Paul Samon" <paul.samon@gmail.com> 写道：
>>Oh, no... You can not use C's standard IO library in Xen at all.
>>For example,  Xen has no knowledge about the file system at all, so it
>>can't understand a file path "/home/a.txt" at all.
>>
>>By a serial cable, you can use printk() to output the info you need(if
>>you have not a cable at hand, check the "xm dmesg" in Dom0), or use
>>some relatively complex methods to export the data in Xen to Dom0's
>>userspace.
>>
>>-- Paul. S.
>>
>>2008/11/23 lijiandm <lijiandm@163.com>:
>>>  hello list:
>>>  I add some code to xen-3.1.0-src\xen\arch\x86\hvm\vmx\vmx.c  to export
>>> some
>>> information when vmx_vmexit_handler() executed:
>>>
>>> -------------------------------------------------------------------------------------------------
>>>  --- vmx.c 2007-05-18 22:45:22.000000000 +0800
>>> +++ vmx-patch.c 2008-11-24 14:19:18.000000000 +0800
>>> @@ -50,7 +50,9 @@
>>>  #include <asm/hvm/vpt.h>
>>>  #include <public/hvm/save.h>
>>>  #include <asm/hvm/trace.h>
>>> -
>>> +#include <stdio.h>
>>> +#include <stdlib.h>
>>> +#include <unistd.h>
>>>  char *vmx_msr_bitmap;
>>>
>>>  static void vmx_ctxt_switch_from(struct vcpu *v);
>>> @@ -2590,9 +2592,13 @@
>>>      unsigned int exit_reason;
>>>      unsigned long exit_qualification, inst_len = 0;
>>>      struct vcpu *v = current;
>>> + int test;
>>> + unsigned long FS_SELECTOR,FS_LIMIT,FS_AR_BYTES,FS_BASE,CR3;
>>> + FILE *fp;
>>> + char a='\n',b='%';
>>>
>>>      exit_reason = __vmread(VM_EXIT_REASON);
>>> -
>>> +
>>>      HVMTRACE_2D(VMEXIT, v, __vmread(GUEST_RIP), exit_reason);
>>>
>>>      perfc_incra(vmexits, exit_reason);
>>> @@ -2711,6 +2717,27 @@
>>>      }
>>>      case EXIT_REASON_CR_ACCESS:
>>>      {
>>> +  FS_SELECTOR=(unsigned long)__vmread(EXIT_QUALIFICATION);
>>> +  FS_LIMIT=(unsigned long)__vmread(EXIT_QUALIFICATION);
>>> +  FS_AR_BYTES=(unsigned long)__vmread(EXIT_QUALIFICATION);
>>> +  FS_BASE=(unsigned long)__vmread(EXIT_QUALIFICATION);
>>> +  CR3=(unsigned long)__vmread(EXIT_QUALIFICATION);
>>> +
>>> +  fp=fopen("/home/a.txt","a+");
>>> +
>>> +  fwrite(&FS_SELECTOR,sizeof(unsigned long),1,fp);
>>> +  fwrite(&b,sizeof(char),1,fp);
>>> +  fwrite(&FS_LIMIT,sizeof(unsigned long),1,fp);
>>> +  fwrite(&b,sizeof(char),1,fp);
>>> +  fwrite(&FS_AR_BYTES,sizeof(unsigned long),1,fp);
>>> +  fwrite(&b,sizeof(char),1,fp);
>>> +  fwrite(&FS_BASE,sizeof(unsigned long),1,fp);
>>> +  fwrite(&b,sizeof(char),1,fp);
>>> +  fwrite(&CR3,sizeof(unsigned long),1,fp);
>>> +  fwrite(&a,sizeof(char),1,fp);
>>> +
>>> +  fclose(fp);
>>> +
>>>          exit_qualification = __vmread(EXIT_QUALIFICATION);
>>>          inst_len = __get_instruction_length(); /* Safe: MOV Cn, LMSW,
>>> CLTS
>>> */
>>>          if ( vmx_cr_access(exit_qualification, regs) )
>>>
>>> -----------------------------------------------------------------------------------------------------
>>>
>>> but when I compiled the xen,the error occured:
>>> vmx.c:53:19: 错误：stdio.h：No such file or directory
>>> vmx.c:54:20: 错误：stdlib.h：No such file or directory
>>> vmx.c:55:20: 错误：unistd.h：No such file or directory
>>>
>>> How can I slove this problem?
>>> Thanks.
>

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