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/*
* memshrtool.c
*
* Copyright 2011 GridCentric Inc. (Adin Scannell, Andres Lagar-Cavilla)
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/mman.h>
#define XC_WANT_COMPAT_MAP_FOREIGN_API
#include "xenctrl.h"
static int usage(const char* prog)
{
printf("usage: %s <command> [args...]\n", prog);
printf("where <command> may be:\n");
printf(" info - Display total sharing info.\n");
printf(" enable - Enable sharing on a domain.\n");
printf(" disable - Disable sharing on a domain.\n");
printf(" nominate <domid> <gfn> - Nominate a page for sharing.\n");
printf(" share <domid> <gfn> <handle> <source> <source-gfn> <source-handle>\n");
printf(" - Share two pages.\n");
printf(" range <source-domid> <destination-domid> <first-gfn> <last-gfn>\n");
printf(" - Share pages between domains in a range.\n");
printf(" unshare <domid> <gfn> - Unshare a page by grabbing a writable map.\n");
printf(" add-to-physmap <domid> <gfn> <source> <source-gfn> <source-handle>\n");
printf(" - Populate a page in a domain with a shared page.\n");
printf(" debug-gfn <domid> <gfn> - Debug a particular domain and gfn.\n");
printf(" audit - Audit the sharing subsytem in Xen.\n");
return 1;
}
#define R(f) do { \
int rc = f; \
if ( rc < 0 ) { \
printf("error executing %s: %s\n", #f, \
((errno * -1) == XENMEM_SHARING_OP_S_HANDLE_INVALID) ? \
"problem with client handle" :\
((errno * -1) == XENMEM_SHARING_OP_C_HANDLE_INVALID) ? \
"problem with source handle" : strerror(errno)); \
return rc; \
} \
} while(0)
int main(int argc, const char** argv)
{
const char* cmd = NULL;
xc_interface *xch = xc_interface_open(0, 0, 0);
if( argc < 2 )
return usage(argv[0]);
cmd = argv[1];
if( !strcasecmp(cmd, "info") )
{
long rc;
if( argc != 2 )
return usage(argv[0]);
rc = xc_sharing_freed_pages(xch);
if ( rc < 0 )
return 1;
printf("used = %ld\n", rc);
rc = xc_sharing_used_frames(xch);
if ( rc < 0 )
return 1;
printf("freed = %ld\n", rc);
}
else if( !strcasecmp(cmd, "enable") )
{
domid_t domid;
if( argc != 3 )
return usage(argv[0]);
domid = strtol(argv[2], NULL, 0);
R(xc_memshr_control(xch, domid, 1));
}
else if( !strcasecmp(cmd, "disable") )
{
domid_t domid;
if( argc != 3 )
return usage(argv[0]);
domid = strtol(argv[2], NULL, 0);
R(xc_memshr_control(xch, domid, 0));
}
else if( !strcasecmp(cmd, "nominate") )
{
domid_t domid;
unsigned long gfn;
uint64_t handle;
if( argc != 4 )
return usage(argv[0]);
domid = strtol(argv[2], NULL, 0);
gfn = strtol(argv[3], NULL, 0);
R(xc_memshr_nominate_gfn(xch, domid, gfn, &handle));
printf("handle = 0x%08llx\n", (unsigned long long) handle);
}
else if( !strcasecmp(cmd, "share") )
{
domid_t domid;
unsigned long gfn;
uint64_t handle;
domid_t source_domid;
unsigned long source_gfn;
uint64_t source_handle;
if( argc != 8 )
return usage(argv[0]);
domid = strtol(argv[2], NULL, 0);
gfn = strtol(argv[3], NULL, 0);
handle = strtol(argv[4], NULL, 0);
source_domid = strtol(argv[5], NULL, 0);
source_gfn = strtol(argv[6], NULL, 0);
source_handle = strtol(argv[7], NULL, 0);
R(xc_memshr_share_gfns(xch, source_domid, source_gfn, source_handle, domid, gfn, handle));
}
else if( !strcasecmp(cmd, "unshare") )
{
domid_t domid;
unsigned long gfn;
void *map;
if( argc != 4 )
return usage(argv[0]);
domid = strtol(argv[2], NULL, 0);
gfn = strtol(argv[3], NULL, 0);
map = xc_map_foreign_range(xch, domid, 4096, PROT_WRITE, gfn);
if( map )
munmap(map, 4096);
R((int)!map);
}
else if( !strcasecmp(cmd, "add-to-physmap") )
{
domid_t domid;
unsigned long gfn;
domid_t source_domid;
unsigned long source_gfn;
uint64_t source_handle;
if( argc != 7 )
return usage(argv[0]);
domid = strtol(argv[2], NULL, 0);
gfn = strtol(argv[3], NULL, 0);
source_domid = strtol(argv[4], NULL, 0);
source_gfn = strtol(argv[5], NULL, 0);
source_handle = strtol(argv[6], NULL, 0);
R(xc_memshr_add_to_physmap(xch, source_domid, source_gfn, source_handle, domid, gfn));
}
else if( !strcasecmp(cmd, "debug-gfn") )
{
domid_t domid;
unsigned long gfn;
if( argc != 4 )
return usage(argv[0]);
domid = strtol(argv[2], NULL, 0);
gfn = strtol(argv[3], NULL, 0);
R(xc_memshr_debug_gfn(xch, domid, gfn));
}
else if( !strcasecmp(cmd, "audit") )
{
int rc = xc_memshr_audit(xch);
if ( rc < 0 )
{
printf("error executing xc_memshr_audit: %s\n", strerror(errno));
return rc;
}
printf("Audit returned %d errors.\n", rc);
}
else if( !strcasecmp(cmd, "range") )
{
domid_t sdomid, cdomid;
int rc;
uint64_t first_gfn, last_gfn;
if ( argc != 6 )
return usage(argv[0]);
sdomid = strtol(argv[2], NULL, 0);
cdomid = strtol(argv[3], NULL, 0);
first_gfn = strtoul(argv[4], NULL, 0);
last_gfn = strtoul(argv[5], NULL, 0);
rc = xc_memshr_range_share(xch, sdomid, cdomid, first_gfn, last_gfn);
if ( rc < 0 )
{
printf("error executing xc_memshr_range_share: %s\n", strerror(errno));
return rc;
}
}
return 0;
}
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