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<body class="manpage">
<div id="header">
<h1>
libtraceevent(3) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
tep_plugin_kvm_get_func, tep_plugin_kvm_put_func -
 Add function name for instruction pointer of kvm plugin

</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="verseblock">
<pre class="content">#include &lt;event-parse.h&gt;

const char *tep_plugin_kvm_get_func(struct tep_event *event,
 struct tep_record *record,
 unsigned long long *paddr);
void tep_plugin_kvm_put_func(const char *func);</pre>
<div class="attribution">
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph">The functions tep_plugin_kvm_get_func() and tep_plugin_kvm_put_func()
are not to be called by an application, but instead are to be defined by
an application.</div>
<div class="paragraph">Certain events (like kvm_exit and kvm_entry) have the instruction pointer
of where in the guest the context changed from guest to host. As the host
only knows the instruction pointer and does not have information about what
function in the guest that instruction pointer belongs to, it can only print
the address.</div>
<div class="paragraph">But the application may have more information about the guest, and know where
the guest was when the exit occurred, and also even know the function name
of that address.</div>
<div class="paragraph">The KVM plugin for libtraceevent is called on these events, and then calls
tep_plugin_kvm_get_func() to see if that function can resolve the instruction
pointer address to a real function name. If the return is non NULL, it will
print the function in the output for that event.</div>
<div class="paragraph">These functions are currently defined as weak functions within the plugin, as
to not require them to be defined elsewhere. For an application to override
the weak function, it will need to define the function in a file that gets
compiled with -rdynamic. That will tell the dynamic linker to examine that
object file and use function names to resolve weak functions in other shared
objects (in this case the KVM plugin shared object).</div>
<div class="paragraph">If the application defines tep_plugin_kvm_get_func(), it must use the above
prototype. The event will hold the KVM event that has the instruction pointer
field. The record will be the instance of that event. The application&#8217;s function
does not need to use these parameters, but they may be useful for finding the
function name for the address. The paddr is a pointer to a 64 bit value (where
only 32 bits may be used on 32 bit machines). This value is the instruction
pointer to look up. If the application knows the start address of the function
as well, it can set paddr to that address, and the KVM plugin will also
append a "+offset" to the function name where the offset is the original
value in paddr minus the value in paddr when it is called. Finally,
the application should return the function name as a nul terminated string
if one is found.</div>
<div class="paragraph">If the returned string of tep_plugin_kvm_get_func() was allocated, the KVM plugin
will call tep_plugin_kvm_put_func() when it is through with it, passing the
value returned by tep_plugin_kvm_get_func() as func. This allows the application
to free it if necessary.</div>
</div>
</div>
<div class="sect1">
<h2 id="_return_value">RETURN VALUE</h2>
<div class="sectionbody">
<div class="paragraph">The tep_plugin_kvm_get_func() is not to be called by the application but instead
is to be defined by the application. It should return a nul terminated string representing
the function for the given instruction pointer passed to it by reference in paddr. It
can then optionally update the paddr to a value that holds the start of the function.
The string returned may be freed by the tep_plugin_kvm_put_func() that the application
should define to clean up the string.</div>
<div class="paragraph">The below example needs to be compiled with the -rdynamic flag so that the dynamic
linker can resolve the tep_plugin_kvm_get_func() and tep_plugin_kvm_put_func() functions.</div>
<div class="paragraph">When run against a trace.dat file produced by trace-cmd(1) recording the kvm_exit and
kvm_entry events on a guest, and then the guest&#8217;s /proc/kallsyms file is passed as the
second parameter, the output produced will look something like:</div>
<div class="listingblock">
<div class="content">
<pre><tt>CPU 0/KVM-20407 83156.177626 [000] kvm_exit reason APIC_ACCESS rip 0xffffffffb0056ee2 exit native_apic_mem_write+0x2 info 10b0 0
CPU 0/KVM-20407 83156.177632 [000] kvm_entry vcpu 0 rip 0xffffffffb0056ee8 enter native_apic_mem_write+0x8</tt></pre></div></div>
<div class="paragraph">But without those callbacks, it would look like:</div>
<div class="listingblock">
<div class="content">
<pre><tt>CPU 0/KVM-20407 83156.177626 [000] kvm_exit reason APIC_ACCESS rip 0xffffffffb0056ee2 info 10b0 0
CPU 0/KVM-20407 83156.177632 [000] kvm_entry vcpu 0 rip 0xffffffffb0056ee8</tt></pre></div></div>
</div>
</div>
<div class="sect1">
<h2 id="_example">EXAMPLE</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre><tt>#include &lt;stdio.h&gt;
#include &lt;stdlib.h&gt;
#include &lt;event-parse.h&gt;
#include &lt;trace-cmd.h&gt;
#include &lt;sys/stat.h&gt;

static struct tep_handle *tep;

const char *tep_plugin_kvm_get_func(struct tep_event *event, struct tep_record *record,
 unsigned long long *paddr)
{
 const char *func;
 char *event_func;
 char *ename;

func = tep_find_function(tep, *paddr);
 if (!func)
 return NULL;

/*
 * Normally, passing back func directly is sufficient and then
 * tep_plugin_kvm_put_func() would not be required. But this example
 * is showing how to handle allocation of the returned string.
 */
 event_func = malloc(strlen(ename) + strlen(func) + 2);
 if (!event_func)
 return NULL;
 sprintf(event_func, "%s %s", ename, func);

*paddr = tep_find_function_address(tep, *paddr);

return event_func;
}

void tep_plugin_kvm_put_func(const char *func)
{
 char *f = (char *)func;

free(f);
}

static int show_event(struct tracecmd_input *handle, struct tep_event *event,
 struct tep_record *record, int cpu, void *data)
{
 static struct trace_seq seq;
 tep = data;

if (!seq.buffer)
 trace_seq_init(&amp;seq);

trace_seq_reset(&amp;seq);
 tep_print_event(tracecmd_get_tep(handle), &amp;seq, record,
 "%s-%d\t%6.1000d [%03d] %s\t%s\n",
 TEP_PRINT_COMM, TEP_PRINT_PID,
 TEP_PRINT_TIME, TEP_PRINT_CPU,
 TEP_PRINT_NAME, TEP_PRINT_INFO);
 trace_seq_terminate(&amp;seq);
 trace_seq_do_printf(&amp;seq);
 return 0;
}

int main(int argc, char **argv)
{
 struct tracecmd_input *handle;
 struct tep_handle *guest_tep;
 struct stat st;
 FILE *fp;
 char *buf;

if (argc &lt; 3) {
 printf("usage: trace.dat guest_kallsyms_file\n");
 exit(-1);
 }

handle = tracecmd_open(argv[1], 0);
 if (!handle) {
 perror(argv[1]);
 exit(-1);
 }

/* Just for kallsyms parsing */
 guest_tep = tep_alloc();
 if (!guest_tep)
 exit(-1);

if (stat(argv[2], &amp;st) &lt; 0) {
 perror(argv[2]);
 exit(-1);
 }

buf = malloc(st.st_size + 1);
 if (!buf)
 exit(-1);

fp = fopen(argv[2], "r");
 if (!fp) {
 perror(argv[2]);
 exit(-1);
 }

if (fread(buf, st.st_size, 1, fp) &lt; 0) {
 perror(argv[2]);
 exit(-1);
 }

buf[st.st_size] = '\0';

if (tep_parse_kallsyms(guest_tep, buf) &lt; 0) {
 printf("Failed to parse %s\n", argv[2]);
 exit(-1);
 }
 free(buf);

tracecmd_follow_event(handle, "kvm", "kvm_exit", show_event, guest_tep);
 tracecmd_follow_event(handle, "kvm", "kvm_entry", show_event, guest_tep);

tracecmd_iterate_events(handle, NULL, 0, NULL, NULL);

tep_free(guest_tep);
 tracecmd_close(handle);
}</tt></pre></div></div>
</div>
</div>
<div class="sect1">
<h2 id="_files">FILES</h2>
<div class="sectionbody">
<div class="verseblock">
<pre class="content">event-parse.h
 Header file to include in order to have access to the library APIs.
-ltraceevent
 Linker switch to add when building a program that uses the library.</pre>
<div class="attribution">
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">SEE ALSO</h2>
<div class="sectionbody">
<div class="paragraph">libtraceevent(3), trace-cmd(1)</div>
</div>
</div>
<div class="sect1">
<h2 id="_reporting_bugs">REPORTING BUGS</h2>
<div class="sectionbody">
<div class="paragraph">Report bugs to &lt;<a href="mailto:linux-trace-devel@vger.kernel.org">linux-trace-devel@vger.kernel.org</a>&gt;</div>
</div>
</div>
<div class="sect1">
<h2 id="_license">LICENSE</h2>
<div class="sectionbody">
<div class="paragraph">libtraceevent is Free Software licensed under the GNU LGPL 2.1</div>
</div>
</div>
<div class="sect1">
<h2 id="_resources">RESOURCES</h2>
<div class="sectionbody">
<div class="paragraph"><a href="https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/">https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/</a></div>
</div>
</div>
</div>
<div id="footnotes"><hr /></div>
<div id="footer">
<div id="footer-text">
Last updated
 2024-10-11 21:26:45 UTC
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