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/******************************************************************************
* tools/vmtrace.c
*
* Demonstrative tool for collecting Intel Processor Trace data from Xen.
* Could be used to externally monitor a given vCPU in given DomU.
*
* Copyright (C) 2020 by CERT Polska - NASK PIB
*
* Authors: Michał Leszczyński, michal.leszczynski@cert.pl
* Date: June, 2020
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; under version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; If not, see <http://www.gnu.org/licenses/>.
*/
#include <err.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <xenctrl.h>
#include <xenforeignmemory.h>
#define MSR_RTIT_CTL 0x00000570
#define RTIT_CTL_OS (1 << 2)
#define RTIT_CTL_USR (1 << 3)
#define RTIT_CTL_BRANCH_EN (1 << 13)
static xc_interface *xch;
static xenforeignmemory_handle *fh;
static uint32_t domid, vcpu;
static size_t size;
static char *buf;
static sig_atomic_t interrupted;
static void close_handler(int signum)
{
interrupted = 1;
}
static int get_more_data(void)
{
static uint64_t last_pos;
uint64_t pos;
if ( xc_vmtrace_output_position(xch, domid, vcpu, &pos) )
{
perror("xc_vmtrace_output_position()");
return -1;
}
if ( pos > last_pos )
fwrite(buf + last_pos, pos - last_pos, 1, stdout);
else if ( pos < last_pos )
{
/* buffer wrapped */
fwrite(buf + last_pos, size - last_pos, 1, stdout);
fwrite(buf, pos, 1, stdout);
}
last_pos = pos;
return 0;
}
int main(int argc, char **argv)
{
int rc, exit = 1;
xenforeignmemory_resource_handle *fres = NULL;
struct sigaction act;
act.sa_handler = close_handler;
act.sa_flags = 0;
sigemptyset(&act.sa_mask);
sigaction(SIGHUP, &act, NULL);
sigaction(SIGTERM, &act, NULL);
sigaction(SIGINT, &act, NULL);
sigaction(SIGALRM, &act, NULL);
if ( argc != 3 )
{
fprintf(stderr, "Usage: %s <domid> <vcpu_id>\n", argv[0]);
fprintf(stderr, "It's recommended to redirect thisprogram's output to file\n");
fprintf(stderr, "or to pipe it's output to xxd or other program.\n");
return 1;
}
domid = atoi(argv[1]);
vcpu = atoi(argv[2]);
xch = xc_interface_open(NULL, NULL, 0);
fh = xenforeignmemory_open(NULL, 0);
if ( !xch )
err(1, "xc_interface_open()");
if ( !fh )
err(1, "xenforeignmemory_open()");
rc = xenforeignmemory_resource_size(
fh, domid, XENMEM_resource_vmtrace_buf, vcpu, &size);
if ( rc )
err(1, "xenforeignmemory_resource_size()");
fres = xenforeignmemory_map_resource(
fh, domid, XENMEM_resource_vmtrace_buf, vcpu,
0, size >> XC_PAGE_SHIFT, (void **)&buf, PROT_READ, 0);
if ( !fres )
err(1, "xenforeignmemory_map_resource()");
if ( xc_vmtrace_set_option(
xch, domid, vcpu, MSR_RTIT_CTL,
RTIT_CTL_BRANCH_EN | RTIT_CTL_USR | RTIT_CTL_OS) )
{
perror("xc_vmtrace_set_option()");
goto out;
}
if ( xc_vmtrace_reset_and_enable(xch, domid, vcpu) )
{
perror("xc_vmtrace_enable()");
goto out;
}
while ( !interrupted )
{
xc_domaininfo_t dominfo;
if ( get_more_data() )
goto out;
usleep(1000 * 100);
if ( xc_domain_getinfo_single(xch, domid, &dominfo) < 0 ||
(dominfo.flags & XEN_DOMINF_shutdown) )
{
if ( get_more_data() )
goto out;
break;
}
}
exit = 0;
out:
if ( xc_vmtrace_disable(xch, domid, vcpu) )
perror("xc_vmtrace_disable()");
if ( fres && xenforeignmemory_unmap_resource(fh, fres) )
perror("xenforeignmemory_unmap_resource()");
return exit;
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
|
