static void gcov_read(const char *fn)
{
struct xen_sysctl sys;
uint32_t total_len;
DECLARE_HYPERCALL_BUFFER(uint8_t, p);
FILE *f;
if (gcov_sysctl(XEN_SYSCTL_GCOV_get_size, &sys, NULL, 0) < 0)
err(1, "getting total length");
total_len = sys.u.gcov_op.size;
/* Shouldn't exceed a few hundred kilobytes */
if (total_len > 8u * 1024u * 1024u)
errx(1, "gcov data too big %u bytes\n", total_len);
p = xc_hypercall_buffer_alloc(xch, p, total_len);
if (!p)
err(1, "allocating buffer");
memset(p, 0, total_len);
if (gcov_sysctl(XEN_SYSCTL_GCOV_read, &sys, HYPERCALL_BUFFER(p),
total_len) < 0)
err(1, "getting gcov data");
if (!strcmp(fn, "-"))
f = stdout;
else
f = fopen(fn, "w");
if (!f)
err(1, "opening output file");
if (fwrite(p, 1, total_len, f) != total_len)
err(1, "writing gcov data to file");
if (f != stdout)
fclose(f);
xc_hypercall_buffer_free(xch, p);
}
int main(int argc, char *argv[])
{
xc_interface *xc_handle;
uint32_t i, j, n;
uint64_t time;
double l, b, sl, sb;
char name[100];
DECLARE_HYPERCALL_BUFFER(xc_lockprof_data_t, data);
if ( (argc > 2) || ((argc == 2) && (strcmp(argv[1], "-r") != 0)) )
{
printf("%s: [-r]\n", argv[0]);
printf("no args: print lock profile data\n");
printf(" -r : reset profile data\n");
return 1;
}
if ( (xc_handle = xc_interface_open(0,0,0)) == 0 )
{
fprintf(stderr, "Error opening xc interface: %d (%s)\n",
errno, strerror(errno));
return 1;
}
if ( argc > 1 )
{
if ( xc_lockprof_reset(xc_handle) != 0 )
{
fprintf(stderr, "Error reseting profile data: %d (%s)\n",
errno, strerror(errno));
return 1;
}
return 0;
}
n = 0;
if ( xc_lockprof_query_number(xc_handle, &n) != 0 )
{
fprintf(stderr, "Error getting number of profile records: %d (%s)\n",
errno, strerror(errno));
return 1;
}
n += 32; /* just to be sure */
data = xc_hypercall_buffer_alloc(xc_handle, data, sizeof(*data) * n);
if ( data == NULL )
{
fprintf(stderr, "Could not allocate buffers: %d (%s)\n",
errno, strerror(errno));
return 1;
}
i = n;
if ( xc_lockprof_query(xc_handle, &i, &time, HYPERCALL_BUFFER(data)) != 0 )
{
fprintf(stderr, "Error getting profile records: %d (%s)\n",
errno, strerror(errno));
return 1;
}
if ( i > n )
{
printf("data incomplete, %d records are missing!\n\n", i - n);
i = n;
}
sl = 0;
sb = 0;
for ( j = 0; j < i; j++ )
{
switch ( data[j].type )
{
case LOCKPROF_TYPE_GLOBAL:
sprintf(name, "global lock %s", data[j].name);
break;
case LOCKPROF_TYPE_PERDOM:
sprintf(name, "domain %d lock %s", data[j].idx, data[j].name);
break;
default:
sprintf(name, "unknown type(%d) %d lock %s", data[j].type,
data[j].idx, data[j].name);
break;
}
l = (double)(data[j].lock_time) / 1E+09;
b = (double)(data[j].block_time) / 1E+09;
sl += l;
sb += b;
printf("%-50s: lock:%12"PRId64"(%20.9fs), "
"block:%12"PRId64"(%20.9fs)\n",
name, data[j].lock_cnt, l, data[j].block_cnt, b);
}
l = (double)time / 1E+09;
printf("total profiling time: %20.9fs\n", l);
printf("total locked time: %20.9fs\n", sl);
printf("total blocked time: %20.9fs\n", sb);
xc_hypercall_buffer_free(xc_handle, data);
return 0;
}
/*
* The heart of this function is to get an array of xen_livepatch_status_t.
*
* However it is complex because it has to deal with the hypervisor
* returning some of the requested data or data being stale
* (another hypercall might alter the list).
*
* The parameters that the function expects to contain data from
* the hypervisor are: 'info', 'name', and 'len'. The 'done' and
* 'left' are also updated with the number of entries filled out
* and respectively the number of entries left to get from hypervisor.
*
* It is expected that the caller of this function will take the
* 'left' and use the value for 'start'. This way we have an
* cursor in the array. Note that the 'info','name', and 'len' will
* be updated at the subsequent calls.
*
* The 'max' is to be provided by the caller with the maximum
* number of entries that 'info', 'name', and 'len' arrays can
* be filled up with.
*
* Each entry in the 'name' array is expected to be of XEN_LIVEPATCH_NAME_SIZE
* length.
*
* Each entry in the 'info' array is expected to be of xen_livepatch_status_t
* structure size.
*
* Each entry in the 'len' array is expected to be of uint32_t size.
*
* The return value is zero if the hypercall completed successfully.
* Note that the return value is _not_ the amount of entries filled
* out - that is saved in 'done'.
*
* If there was an error performing the operation, the return value
* will contain an negative -EXX type value. The 'done' and 'left'
* will contain the number of entries that had been succesfully
* retrieved (if any).
*/
int xc_livepatch_list(xc_interface *xch, unsigned int max, unsigned int start,
xen_livepatch_status_t *info,
char *name, uint32_t *len,
unsigned int *done,
unsigned int *left)
{
int rc;
DECLARE_SYSCTL;
/* The sizes are adjusted later - hence zero. */
DECLARE_HYPERCALL_BOUNCE(info, 0, XC_HYPERCALL_BUFFER_BOUNCE_OUT);
DECLARE_HYPERCALL_BOUNCE(name, 0, XC_HYPERCALL_BUFFER_BOUNCE_OUT);
DECLARE_HYPERCALL_BOUNCE(len, 0, XC_HYPERCALL_BUFFER_BOUNCE_OUT);
uint32_t max_batch_sz, nr;
uint32_t version = 0, retries = 0;
uint32_t adjust = 0;
ssize_t sz;
if ( !max || !info || !name || !len )
{
errno = EINVAL;
return -1;
}
sysctl.cmd = XEN_SYSCTL_livepatch_op;
sysctl.u.livepatch.cmd = XEN_SYSCTL_LIVEPATCH_LIST;
sysctl.u.livepatch.pad = 0;
sysctl.u.livepatch.u.list.version = 0;
sysctl.u.livepatch.u.list.idx = start;
sysctl.u.livepatch.u.list.pad = 0;
max_batch_sz = max;
/* Convience value. */
sz = sizeof(*name) * XEN_LIVEPATCH_NAME_SIZE;
*done = 0;
*left = 0;
do {
/*
* The first time we go in this loop our 'max' may be bigger
* than what the hypervisor is comfortable with - hence the first
* couple of loops may adjust the number of entries we will
* want filled (tracked by 'nr').
*
* N.B. This is a do { } while loop and the right hand side of
* the conditional when adjusting will evaluate to false (as
* *left is set to zero before the loop. Hence we need this
* adjust - even if we reset it at the start of the loop.
*/
if ( adjust )
adjust = 0; /* Used when adjusting the 'max_batch_sz' or 'retries'. */
nr = min(max - *done, max_batch_sz);
sysctl.u.livepatch.u.list.nr = nr;
/* Fix the size (may vary between hypercalls). */
HYPERCALL_BOUNCE_SET_SIZE(info, nr * sizeof(*info));
HYPERCALL_BOUNCE_SET_SIZE(name, nr * nr);
HYPERCALL_BOUNCE_SET_SIZE(len, nr * sizeof(*len));
/* Move the pointer to proper offset into 'info'. */
(HYPERCALL_BUFFER(info))->ubuf = info + *done;
(HYPERCALL_BUFFER(name))->ubuf = name + (sz * *done);
(HYPERCALL_BUFFER(len))->ubuf = len + *done;
/* Allocate memory. */
rc = xc_hypercall_bounce_pre(xch, info);
if ( rc )
break;
rc = xc_hypercall_bounce_pre(xch, name);
if ( rc )
break;
rc = xc_hypercall_bounce_pre(xch, len);
if ( rc )
break;
set_xen_guest_handle(sysctl.u.livepatch.u.list.status, info);
set_xen_guest_handle(sysctl.u.livepatch.u.list.name, name);
set_xen_guest_handle(sysctl.u.livepatch.u.list.len, len);
rc = do_sysctl(xch, &sysctl);
/*
* From here on we MUST call xc_hypercall_bounce. If rc < 0 we
* end up doing it (outside the loop), so using a break is OK.
*/
if ( rc < 0 && errno == E2BIG )
{
if ( max_batch_sz <= 1 )
break;
max_batch_sz >>= 1;
adjust = 1; /* For the loop conditional to let us loop again. */
/* No memory leaks! */
xc_hypercall_bounce_post(xch, info);
xc_hypercall_bounce_post(xch, name);
xc_hypercall_bounce_post(xch, len);
continue;
}
else if ( rc < 0 ) /* For all other errors we bail out. */
break;
if ( !version )
version = sysctl.u.livepatch.u.list.version;
if ( sysctl.u.livepatch.u.list.version != version )
{
/* We could make this configurable as parameter? */
if ( retries++ > 3 )
{
rc = -1;
errno = EBUSY;
break;
}
*done = 0; /* Retry from scratch. */
version = sysctl.u.livepatch.u.list.version;
adjust = 1; /* And make sure we continue in the loop. */
/* No memory leaks. */
xc_hypercall_bounce_post(xch, info);
xc_hypercall_bounce_post(xch, name);
xc_hypercall_bounce_post(xch, len);
continue;
}
/* We should never hit this, but just in case. */
if ( rc > nr )
{
errno = EOVERFLOW; /* Overflow! */
rc = -1;
break;
}
*left = sysctl.u.livepatch.u.list.nr; /* Total remaining count. */
/* Copy only up 'rc' of data' - we could add 'min(rc,nr) if desired. */
HYPERCALL_BOUNCE_SET_SIZE(info, (rc * sizeof(*info)));
HYPERCALL_BOUNCE_SET_SIZE(name, (rc * sz));
HYPERCALL_BOUNCE_SET_SIZE(len, (rc * sizeof(*len)));
/* Bounce the data and free the bounce buffer. */
xc_hypercall_bounce_post(xch, info);
xc_hypercall_bounce_post(xch, name);
xc_hypercall_bounce_post(xch, len);
/* And update how many elements of info we have copied into. */
*done += rc;
/* Update idx. */
sysctl.u.livepatch.u.list.idx = *done;
} while ( adjust || (*done < max && *left != 0) );
static int xc_resource_op_multi(xc_interface *xch, uint32_t nr_ops, xc_resource_op_t *ops)
{
int rc, i, entries_size;
xc_resource_op_t *op;
multicall_entry_t *call;
DECLARE_HYPERCALL_BUFFER(multicall_entry_t, call_list);
xc_hypercall_buffer_array_t *platform_ops, *entries_list = NULL;
call_list = xc_hypercall_buffer_alloc(xch, call_list,
sizeof(*call_list) * nr_ops);
if ( !call_list )
return -1;
platform_ops = xc_hypercall_buffer_array_create(xch, nr_ops);
if ( !platform_ops )
{
rc = -1;
goto out;
}
entries_list = xc_hypercall_buffer_array_create(xch, nr_ops);
if ( !entries_list )
{
rc = -1;
goto out;
}
for ( i = 0; i < nr_ops; i++ )
{
DECLARE_HYPERCALL_BUFFER(xen_platform_op_t, platform_op);
DECLARE_HYPERCALL_BUFFER(xc_resource_entry_t, entries);
op = ops + i;
platform_op = xc_hypercall_buffer_array_alloc(xch, platform_ops, i,
platform_op, sizeof(xen_platform_op_t));
if ( !platform_op )
{
rc = -1;
goto out;
}
entries_size = sizeof(xc_resource_entry_t) * op->nr_entries;
entries = xc_hypercall_buffer_array_alloc(xch, entries_list, i,
entries, entries_size);
if ( !entries)
{
rc = -1;
goto out;
}
memcpy(entries, op->entries, entries_size);
call = call_list + i;
call->op = __HYPERVISOR_platform_op;
call->args[0] = HYPERCALL_BUFFER_AS_ARG(platform_op);
platform_op->interface_version = XENPF_INTERFACE_VERSION;
platform_op->cmd = XENPF_resource_op;
platform_op->u.resource_op.cpu = op->cpu;
platform_op->u.resource_op.nr_entries = op->nr_entries;
set_xen_guest_handle(platform_op->u.resource_op.entries, entries);
}
rc = do_multicall_op(xch, HYPERCALL_BUFFER(call_list), nr_ops);
for ( i = 0; i < nr_ops; i++ )
{
DECLARE_HYPERCALL_BUFFER(xc_resource_entry_t, entries);
op = ops + i;
call = call_list + i;
op->result = call->result;
entries_size = sizeof(xc_resource_entry_t) * op->nr_entries;
entries = xc_hypercall_buffer_array_get(xch, entries_list, i,
entries, entries_size);
memcpy(op->entries, entries, entries_size);
}
out:
xc_hypercall_buffer_array_destroy(xch, entries_list);
xc_hypercall_buffer_array_destroy(xch, platform_ops);
xc_hypercall_buffer_free(xch, call_list);
return rc;
}
int xc_version(xc_interface *xch, int cmd, void *arg)
{
DECLARE_HYPERCALL_BOUNCE(arg, 0, XC_HYPERCALL_BUFFER_BOUNCE_OUT); /* Size unknown until cmd decoded */
size_t sz;
int rc;
switch ( cmd )
{
case XENVER_version:
sz = 0;
break;
case XENVER_extraversion:
sz = sizeof(xen_extraversion_t);
break;
case XENVER_compile_info:
sz = sizeof(xen_compile_info_t);
break;
case XENVER_capabilities:
sz = sizeof(xen_capabilities_info_t);
break;
case XENVER_changeset:
sz = sizeof(xen_changeset_info_t);
break;
case XENVER_platform_parameters:
sz = sizeof(xen_platform_parameters_t);
break;
case XENVER_get_features:
sz = sizeof(xen_feature_info_t);
break;
case XENVER_pagesize:
sz = 0;
break;
case XENVER_guest_handle:
sz = sizeof(xen_domain_handle_t);
break;
case XENVER_commandline:
sz = sizeof(xen_commandline_t);
break;
case XENVER_build_id:
{
xen_build_id_t *build_id = (xen_build_id_t *)arg;
sz = sizeof(*build_id) + build_id->len;
HYPERCALL_BOUNCE_SET_DIR(arg, XC_HYPERCALL_BUFFER_BOUNCE_BOTH);
break;
}
default:
ERROR("xc_version: unknown command %d\n", cmd);
return -EINVAL;
}
HYPERCALL_BOUNCE_SET_SIZE(arg, sz);
if ( (sz != 0) && xc_hypercall_bounce_pre(xch, arg) )
{
PERROR("Could not bounce buffer for version hypercall");
return -ENOMEM;
}
rc = do_xen_version(xch, cmd, HYPERCALL_BUFFER(arg));
if ( sz != 0 )
xc_hypercall_bounce_post(xch, arg);
return rc;
}
