int xc_pm_get_pxstat(xc_interface *xch, int cpuid, struct xc_px_stat *pxpt)
{
DECLARE_SYSCTL;
/* Sizes unknown until xc_pm_get_max_px */
DECLARE_NAMED_HYPERCALL_BOUNCE(trans, pxpt->trans_pt, 0, XC_HYPERCALL_BUFFER_BOUNCE_BOTH);
DECLARE_NAMED_HYPERCALL_BOUNCE(pt, pxpt->pt, 0, XC_HYPERCALL_BUFFER_BOUNCE_BOTH);
int max_px, ret;
if ( !pxpt->trans_pt || !pxpt->pt )
{
errno = EINVAL;
return -1;
}
if ( (ret = xc_pm_get_max_px(xch, cpuid, &max_px)) != 0)
return ret;
HYPERCALL_BOUNCE_SET_SIZE(trans, max_px * max_px * sizeof(uint64_t));
HYPERCALL_BOUNCE_SET_SIZE(pt, max_px * sizeof(struct xc_px_val));
if ( xc_hypercall_bounce_pre(xch, trans) )
return ret;
if ( xc_hypercall_bounce_pre(xch, pt) )
{
xc_hypercall_bounce_post(xch, trans);
return ret;
}
sysctl.cmd = XEN_SYSCTL_get_pmstat;
sysctl.u.get_pmstat.type = PMSTAT_get_pxstat;
sysctl.u.get_pmstat.cpuid = cpuid;
sysctl.u.get_pmstat.u.getpx.total = max_px;
set_xen_guest_handle(sysctl.u.get_pmstat.u.getpx.trans_pt, trans);
set_xen_guest_handle(sysctl.u.get_pmstat.u.getpx.pt, pt);
ret = xc_sysctl(xch, &sysctl);
if ( ret )
{
xc_hypercall_bounce_post(xch, trans);
xc_hypercall_bounce_post(xch, pt);
return ret;
}
pxpt->total = sysctl.u.get_pmstat.u.getpx.total;
pxpt->usable = sysctl.u.get_pmstat.u.getpx.usable;
pxpt->last = sysctl.u.get_pmstat.u.getpx.last;
pxpt->cur = sysctl.u.get_pmstat.u.getpx.cur;
xc_hypercall_bounce_post(xch, trans);
xc_hypercall_bounce_post(xch, pt);
return ret;
}
int xc_livepatch_upload(xc_interface *xch,
char *name,
unsigned char *payload,
uint32_t size)
{
int rc;
DECLARE_SYSCTL;
DECLARE_HYPERCALL_BUFFER(char, local);
DECLARE_HYPERCALL_BOUNCE(name, 0 /* later */, XC_HYPERCALL_BUFFER_BOUNCE_IN);
xen_livepatch_name_t def_name = { .pad = { 0, 0, 0 } };
if ( !name || !payload )
{
errno = EINVAL;
return -1;
}
def_name.size = strlen(name) + 1;
if ( def_name.size > XEN_LIVEPATCH_NAME_SIZE )
{
errno = EINVAL;
return -1;
}
HYPERCALL_BOUNCE_SET_SIZE(name, def_name.size);
if ( xc_hypercall_bounce_pre(xch, name) )
return -1;
local = xc_hypercall_buffer_alloc(xch, local, size);
if ( !local )
{
xc_hypercall_bounce_post(xch, name);
return -1;
}
memcpy(local, payload, size);
sysctl.cmd = XEN_SYSCTL_livepatch_op;
sysctl.u.livepatch.cmd = XEN_SYSCTL_LIVEPATCH_UPLOAD;
sysctl.u.livepatch.pad = 0;
sysctl.u.livepatch.u.upload.size = size;
set_xen_guest_handle(sysctl.u.livepatch.u.upload.payload, local);
sysctl.u.livepatch.u.upload.name = def_name;
set_xen_guest_handle(sysctl.u.livepatch.u.upload.name.name, name);
rc = do_sysctl(xch, &sysctl);
xc_hypercall_buffer_free(xch, local);
xc_hypercall_bounce_post(xch, name);
return rc;
}
int xc_livepatch_get(xc_interface *xch,
char *name,
xen_livepatch_status_t *status)
{
int rc;
DECLARE_SYSCTL;
DECLARE_HYPERCALL_BOUNCE(name, 0 /*adjust later */, XC_HYPERCALL_BUFFER_BOUNCE_IN);
xen_livepatch_name_t def_name = { .pad = { 0, 0, 0 } };
if ( !name )
{
errno = EINVAL;
return -1;
}
def_name.size = strlen(name) + 1;
if ( def_name.size > XEN_LIVEPATCH_NAME_SIZE )
{
errno = EINVAL;
return -1;
}
HYPERCALL_BOUNCE_SET_SIZE(name, def_name.size);
if ( xc_hypercall_bounce_pre(xch, name) )
return -1;
sysctl.cmd = XEN_SYSCTL_livepatch_op;
sysctl.u.livepatch.cmd = XEN_SYSCTL_LIVEPATCH_GET;
sysctl.u.livepatch.pad = 0;
sysctl.u.livepatch.u.get.status.state = 0;
sysctl.u.livepatch.u.get.status.rc = 0;
sysctl.u.livepatch.u.get.name = def_name;
set_xen_guest_handle(sysctl.u.livepatch.u.get.name.name, name);
rc = do_sysctl(xch, &sysctl);
xc_hypercall_bounce_post(xch, name);
memcpy(status, &sysctl.u.livepatch.u.get.status, sizeof(*status));
return rc;
}
int xc_tbuf_set_cpu_mask(xc_interface *xch, xc_cpumap_t mask)
{
DECLARE_SYSCTL;
DECLARE_HYPERCALL_BOUNCE(mask, 0, XC_HYPERCALL_BUFFER_BOUNCE_IN);
int ret = -1;
int bits, cpusize;
cpusize = xc_get_cpumap_size(xch);
if (cpusize <= 0)
{
PERROR("Could not get number of cpus");
return -1;
}
HYPERCALL_BOUNCE_SET_SIZE(mask, cpusize);
bits = xc_get_max_cpus(xch);
if (bits <= 0)
{
PERROR("Could not get number of bits");
return -1;
}
if ( xc_hypercall_bounce_pre(xch, mask) )
{
PERROR("Could not allocate memory for xc_tbuf_set_cpu_mask hypercall");
goto out;
}
sysctl.cmd = XEN_SYSCTL_tbuf_op;
sysctl.interface_version = XEN_SYSCTL_INTERFACE_VERSION;
sysctl.u.tbuf_op.cmd = XEN_SYSCTL_TBUFOP_set_cpu_mask;
set_xen_guest_handle(sysctl.u.tbuf_op.cpu_mask.bitmap, mask);
sysctl.u.tbuf_op.cpu_mask.nr_bits = bits;
ret = do_sysctl(xch, &sysctl);
xc_hypercall_bounce_post(xch, mask);
out:
return ret;
}
/*
* 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) );
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;
}
