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cbea5a1149ca7fd4b7cdbfa3ec2e4f109b601ff7
xen/tools/libs/ctrl/xc_misc.c
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Andrew Cooper 06cc1f886f tools/libxc: Drop copy-in in xc_physinfo() 
The first thing XEN_SYSCTL_physinfo does is zero op->u.physinfo.

Do not copy-in.  It's pointless, and most callers don't initialise their
xc_physinfo_t buffer to begin with.  Remove the redundant zeroing from the
remaining callers.

Spotted by Coverity.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Wei Chen <Wei.Chen@arm.com>
Acked-by: Anthony PERARD <anthony.perard@citrix.com>
2022-01-05 09:44:26 +00:00

998 lines
29 KiB
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/******************************************************************************
* xc_misc.c
*
* Miscellaneous control interface functions.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; If not, see <http://www.gnu.org/licenses/>.
*/
#include "xc_bitops.h"
#include "xc_private.h"
#include <xen/hvm/hvm_op.h>
int xc_get_max_cpus(xc_interface *xch)
{
static int max_cpus = 0;
xc_physinfo_t physinfo;
if ( max_cpus )
return max_cpus;
if ( !xc_physinfo(xch, &physinfo) )
{
max_cpus = physinfo.max_cpu_id + 1;
return max_cpus;
}
return -1;
}
int xc_get_online_cpus(xc_interface *xch)
{
xc_physinfo_t physinfo;
if ( !xc_physinfo(xch, &physinfo) )
return physinfo.nr_cpus;
return -1;
}
int xc_get_max_nodes(xc_interface *xch)
{
static int max_nodes = 0;
xc_physinfo_t physinfo;
if ( max_nodes )
return max_nodes;
if ( !xc_physinfo(xch, &physinfo) )
{
max_nodes = physinfo.max_node_id + 1;
return max_nodes;
}
return -1;
}
int xc_get_cpumap_size(xc_interface *xch)
{
int max_cpus = xc_get_max_cpus(xch);
if ( max_cpus < 0 )
return -1;
return (max_cpus + 7) / 8;
}
int xc_get_nodemap_size(xc_interface *xch)
{
int max_nodes = xc_get_max_nodes(xch);
if ( max_nodes < 0 )
return -1;
return (max_nodes + 7) / 8;
}
xc_cpumap_t xc_cpumap_alloc(xc_interface *xch)
{
int sz;
sz = xc_get_cpumap_size(xch);
if (sz <= 0)
return NULL;
return calloc(1, sz);
}
/*
* xc_bitops.h has macros that do this as well - however they assume that
* the bitmask is word aligned but xc_cpumap_t is only guaranteed to be
* byte aligned and so we need byte versions for architectures which do
* not support misaligned accesses (which is basically everyone
* but x86, although even on x86 it can be inefficient).
*
* NOTE: The xc_bitops macros now use byte alignment.
* TODO: Clean up the users of this interface.
*/
#define BITS_PER_CPUMAP(map) (sizeof(*map) * 8)
#define CPUMAP_ENTRY(cpu, map) ((map))[(cpu) / BITS_PER_CPUMAP(map)]
#define CPUMAP_SHIFT(cpu, map) ((cpu) % BITS_PER_CPUMAP(map))
void xc_cpumap_clearcpu(int cpu, xc_cpumap_t map)
{
CPUMAP_ENTRY(cpu, map) &= ~(1U << CPUMAP_SHIFT(cpu, map));
}
void xc_cpumap_setcpu(int cpu, xc_cpumap_t map)
{
CPUMAP_ENTRY(cpu, map) |= (1U << CPUMAP_SHIFT(cpu, map));
}
int xc_cpumap_testcpu(int cpu, xc_cpumap_t map)
{
return (CPUMAP_ENTRY(cpu, map) >> CPUMAP_SHIFT(cpu, map)) & 1;
}
xc_nodemap_t xc_nodemap_alloc(xc_interface *xch)
{
int sz;
sz = xc_get_nodemap_size(xch);
if (sz <= 0)
return NULL;
return calloc(1, sz);
}
int xc_readconsolering(xc_interface *xch,
char *buffer,
unsigned int *pnr_chars,
int clear, int incremental, uint32_t *pindex)
{
int ret;
unsigned int nr_chars = *pnr_chars;
DECLARE_SYSCTL;
DECLARE_HYPERCALL_BOUNCE(buffer, nr_chars, XC_HYPERCALL_BUFFER_BOUNCE_OUT);
if ( xc_hypercall_bounce_pre(xch, buffer) )
return -1;
sysctl.cmd = XEN_SYSCTL_readconsole;
set_xen_guest_handle(sysctl.u.readconsole.buffer, buffer);
sysctl.u.readconsole.count = nr_chars;
sysctl.u.readconsole.clear = clear;
sysctl.u.readconsole.incremental = 0;
if ( pindex )
{
sysctl.u.readconsole.index = *pindex;
sysctl.u.readconsole.incremental = incremental;
}
if ( (ret = do_sysctl(xch, &sysctl)) == 0 )
{
*pnr_chars = sysctl.u.readconsole.count;
if ( pindex )
*pindex = sysctl.u.readconsole.index;
}
xc_hypercall_bounce_post(xch, buffer);
return ret;
}
int xc_send_debug_keys(xc_interface *xch, const char *keys)
{
int ret, len = strlen(keys);
DECLARE_SYSCTL;
DECLARE_HYPERCALL_BOUNCE_IN(keys, len);
if ( xc_hypercall_bounce_pre(xch, keys) )
return -1;
sysctl.cmd = XEN_SYSCTL_debug_keys;
set_xen_guest_handle(sysctl.u.debug_keys.keys, keys);
sysctl.u.debug_keys.nr_keys = len;
ret = do_sysctl(xch, &sysctl);
xc_hypercall_bounce_post(xch, keys);
return ret;
}
int xc_physinfo(xc_interface *xch,
xc_physinfo_t *put_info)
{
int ret;
DECLARE_SYSCTL;
sysctl.cmd = XEN_SYSCTL_physinfo;
if ( (ret = do_sysctl(xch, &sysctl)) != 0 )
return ret;
memcpy(put_info, &sysctl.u.physinfo, sizeof(*put_info));
return 0;
}
int xc_microcode_update(xc_interface *xch, const void *buf, size_t len)
{
int ret;
DECLARE_PLATFORM_OP;
DECLARE_HYPERCALL_BUFFER(struct xenpf_microcode_update, uc);
uc = xc_hypercall_buffer_alloc(xch, uc, len);
if ( uc == NULL )
return -1;
memcpy(uc, buf, len);
platform_op.cmd = XENPF_microcode_update;
platform_op.u.microcode.length = len;
set_xen_guest_handle(platform_op.u.microcode.data, uc);
ret = do_platform_op(xch, &platform_op);
xc_hypercall_buffer_free(xch, uc);
return ret;
}
int xc_cputopoinfo(xc_interface *xch, unsigned *max_cpus,
xc_cputopo_t *cputopo)
{
int ret;
DECLARE_SYSCTL;
DECLARE_HYPERCALL_BOUNCE(cputopo, *max_cpus * sizeof(*cputopo),
XC_HYPERCALL_BUFFER_BOUNCE_OUT);
if ( (ret = xc_hypercall_bounce_pre(xch, cputopo)) )
goto out;
sysctl.u.cputopoinfo.num_cpus = *max_cpus;
set_xen_guest_handle(sysctl.u.cputopoinfo.cputopo, cputopo);
sysctl.cmd = XEN_SYSCTL_cputopoinfo;
if ( (ret = do_sysctl(xch, &sysctl)) != 0 )
goto out;
*max_cpus = sysctl.u.cputopoinfo.num_cpus;
out:
xc_hypercall_bounce_post(xch, cputopo);
return ret;
}
int xc_numainfo(xc_interface *xch, unsigned *max_nodes,
xc_meminfo_t *meminfo, uint32_t *distance)
{
int ret;
DECLARE_SYSCTL;
DECLARE_HYPERCALL_BOUNCE(meminfo, *max_nodes * sizeof(*meminfo),
XC_HYPERCALL_BUFFER_BOUNCE_OUT);
DECLARE_HYPERCALL_BOUNCE(distance,
*max_nodes * *max_nodes * sizeof(*distance),
XC_HYPERCALL_BUFFER_BOUNCE_OUT);
if ( (ret = xc_hypercall_bounce_pre(xch, meminfo)) )
goto out;
if ((ret = xc_hypercall_bounce_pre(xch, distance)) )
goto out;
sysctl.u.numainfo.num_nodes = *max_nodes;
set_xen_guest_handle(sysctl.u.numainfo.meminfo, meminfo);
set_xen_guest_handle(sysctl.u.numainfo.distance, distance);
sysctl.cmd = XEN_SYSCTL_numainfo;
if ( (ret = do_sysctl(xch, &sysctl)) != 0 )
goto out;
*max_nodes = sysctl.u.numainfo.num_nodes;
out:
xc_hypercall_bounce_post(xch, meminfo);
xc_hypercall_bounce_post(xch, distance);
return ret;
}
int xc_pcitopoinfo(xc_interface *xch, unsigned num_devs,
physdev_pci_device_t *devs,
uint32_t *nodes)
{
int ret = 0;
unsigned processed = 0;
DECLARE_SYSCTL;
DECLARE_HYPERCALL_BOUNCE(devs, num_devs * sizeof(*devs),
XC_HYPERCALL_BUFFER_BOUNCE_IN);
DECLARE_HYPERCALL_BOUNCE(nodes, num_devs* sizeof(*nodes),
XC_HYPERCALL_BUFFER_BOUNCE_BOTH);
if ( (ret = xc_hypercall_bounce_pre(xch, devs)) )
goto out;
if ( (ret = xc_hypercall_bounce_pre(xch, nodes)) )
goto out;
sysctl.cmd = XEN_SYSCTL_pcitopoinfo;
while ( processed < num_devs )
{
sysctl.u.pcitopoinfo.num_devs = num_devs - processed;
set_xen_guest_handle_offset(sysctl.u.pcitopoinfo.devs, devs,
processed);
set_xen_guest_handle_offset(sysctl.u.pcitopoinfo.nodes, nodes,
processed);
if ( (ret = do_sysctl(xch, &sysctl)) != 0 )
break;
processed += sysctl.u.pcitopoinfo.num_devs;
}
out:
xc_hypercall_bounce_post(xch, devs);
xc_hypercall_bounce_post(xch, nodes);
return ret;
}
int xc_sched_id(xc_interface *xch,
int *sched_id)
{
int ret;
DECLARE_SYSCTL;
sysctl.cmd = XEN_SYSCTL_sched_id;
if ( (ret = do_sysctl(xch, &sysctl)) != 0 )
return ret;
*sched_id = sysctl.u.sched_id.sched_id;
return 0;
}
#if defined(__i386__) || defined(__x86_64__)
int xc_mca_op(xc_interface *xch, struct xen_mc *mc)
{
int ret = 0;
DECLARE_HYPERCALL_BOUNCE(mc, sizeof(*mc), XC_HYPERCALL_BUFFER_BOUNCE_BOTH);
if ( xc_hypercall_bounce_pre(xch, mc) )
{
PERROR("Could not bounce xen_mc memory buffer");
return -1;
}
mc->interface_version = XEN_MCA_INTERFACE_VERSION;
ret = xencall1(xch->xcall, __HYPERVISOR_mca,
HYPERCALL_BUFFER_AS_ARG(mc));
xc_hypercall_bounce_post(xch, mc);
return ret;
}
int xc_mca_op_inject_v2(xc_interface *xch, unsigned int flags,
xc_cpumap_t cpumap, unsigned int nr_bits)
{
int ret = -1;
struct xen_mc mc_buf, *mc = &mc_buf;
struct xen_mc_inject_v2 *inject = &mc->u.mc_inject_v2;
DECLARE_HYPERCALL_BOUNCE(cpumap, 0, XC_HYPERCALL_BUFFER_BOUNCE_IN);
DECLARE_HYPERCALL_BOUNCE(mc, sizeof(*mc), XC_HYPERCALL_BUFFER_BOUNCE_BOTH);
memset(mc, 0, sizeof(*mc));
if ( cpumap )
{
if ( !nr_bits )
{
errno = EINVAL;
goto out;
}
HYPERCALL_BOUNCE_SET_SIZE(cpumap, (nr_bits + 7) / 8);
if ( xc_hypercall_bounce_pre(xch, cpumap) )
{
PERROR("Could not bounce cpumap memory buffer");
goto out;
}
set_xen_guest_handle(inject->cpumap.bitmap, cpumap);
inject->cpumap.nr_bits = nr_bits;
}
inject->flags = flags;
mc->cmd = XEN_MC_inject_v2;
mc->interface_version = XEN_MCA_INTERFACE_VERSION;
if ( xc_hypercall_bounce_pre(xch, mc) )
{
PERROR("Could not bounce xen_mc memory buffer");
goto out_free_cpumap;
}
ret = xencall1(xch->xcall, __HYPERVISOR_mca, HYPERCALL_BUFFER_AS_ARG(mc));
xc_hypercall_bounce_post(xch, mc);
out_free_cpumap:
if ( cpumap )
xc_hypercall_bounce_post(xch, cpumap);
out:
return ret;
}
#endif /* __i386__ || __x86_64__ */
int xc_perfc_reset(xc_interface *xch)
{
DECLARE_SYSCTL;
sysctl.cmd = XEN_SYSCTL_perfc_op;
sysctl.u.perfc_op.cmd = XEN_SYSCTL_PERFCOP_reset;
set_xen_guest_handle(sysctl.u.perfc_op.desc, HYPERCALL_BUFFER_NULL);
set_xen_guest_handle(sysctl.u.perfc_op.val, HYPERCALL_BUFFER_NULL);
return do_sysctl(xch, &sysctl);
}
int xc_perfc_query_number(xc_interface *xch,
int *nbr_desc,
int *nbr_val)
{
int rc;
DECLARE_SYSCTL;
sysctl.cmd = XEN_SYSCTL_perfc_op;
sysctl.u.perfc_op.cmd = XEN_SYSCTL_PERFCOP_query;
set_xen_guest_handle(sysctl.u.perfc_op.desc, HYPERCALL_BUFFER_NULL);
set_xen_guest_handle(sysctl.u.perfc_op.val, HYPERCALL_BUFFER_NULL);
rc = do_sysctl(xch, &sysctl);
if ( nbr_desc )
*nbr_desc = sysctl.u.perfc_op.nr_counters;
if ( nbr_val )
*nbr_val = sysctl.u.perfc_op.nr_vals;
return rc;
}
int xc_perfc_query(xc_interface *xch,
struct xc_hypercall_buffer *desc,
struct xc_hypercall_buffer *val)
{
DECLARE_SYSCTL;
DECLARE_HYPERCALL_BUFFER_ARGUMENT(desc);
DECLARE_HYPERCALL_BUFFER_ARGUMENT(val);
sysctl.cmd = XEN_SYSCTL_perfc_op;
sysctl.u.perfc_op.cmd = XEN_SYSCTL_PERFCOP_query;
set_xen_guest_handle(sysctl.u.perfc_op.desc, desc);
set_xen_guest_handle(sysctl.u.perfc_op.val, val);
return do_sysctl(xch, &sysctl);
}
int xc_lockprof_reset(xc_interface *xch)
{
DECLARE_SYSCTL;
sysctl.cmd = XEN_SYSCTL_lockprof_op;
sysctl.u.lockprof_op.cmd = XEN_SYSCTL_LOCKPROF_reset;
set_xen_guest_handle(sysctl.u.lockprof_op.data, HYPERCALL_BUFFER_NULL);
return do_sysctl(xch, &sysctl);
}
int xc_lockprof_query_number(xc_interface *xch,
uint32_t *n_elems)
{
int rc;
DECLARE_SYSCTL;
sysctl.cmd = XEN_SYSCTL_lockprof_op;
sysctl.u.lockprof_op.max_elem = 0;
sysctl.u.lockprof_op.cmd = XEN_SYSCTL_LOCKPROF_query;
set_xen_guest_handle(sysctl.u.lockprof_op.data, HYPERCALL_BUFFER_NULL);
rc = do_sysctl(xch, &sysctl);
*n_elems = sysctl.u.lockprof_op.nr_elem;
return rc;
}
int xc_lockprof_query(xc_interface *xch,
uint32_t *n_elems,
uint64_t *time,
struct xc_hypercall_buffer *data)
{
int rc;
DECLARE_SYSCTL;
DECLARE_HYPERCALL_BUFFER_ARGUMENT(data);
sysctl.cmd = XEN_SYSCTL_lockprof_op;
sysctl.u.lockprof_op.cmd = XEN_SYSCTL_LOCKPROF_query;
sysctl.u.lockprof_op.max_elem = *n_elems;
set_xen_guest_handle(sysctl.u.lockprof_op.data, data);
rc = do_sysctl(xch, &sysctl);
*n_elems = sysctl.u.lockprof_op.nr_elem;
return rc;
}
int xc_getcpuinfo(xc_interface *xch, int max_cpus,
xc_cpuinfo_t *info, int *nr_cpus)
{
int rc;
DECLARE_SYSCTL;
DECLARE_HYPERCALL_BOUNCE(info, max_cpus*sizeof(*info), XC_HYPERCALL_BUFFER_BOUNCE_OUT);
if ( xc_hypercall_bounce_pre(xch, info) )
return -1;
sysctl.cmd = XEN_SYSCTL_getcpuinfo;
sysctl.u.getcpuinfo.max_cpus = max_cpus;
set_xen_guest_handle(sysctl.u.getcpuinfo.info, info);
rc = do_sysctl(xch, &sysctl);
xc_hypercall_bounce_post(xch, info);
if ( nr_cpus )
*nr_cpus = sysctl.u.getcpuinfo.nr_cpus;
return rc;
}
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);
struct xen_livepatch_name def_name = { };
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,
struct xen_livepatch_status *status)
{
int rc;
DECLARE_SYSCTL;
DECLARE_HYPERCALL_BOUNCE(name, 0 /*adjust later */, XC_HYPERCALL_BUFFER_BOUNCE_IN);
struct xen_livepatch_name def_name = { };
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;
}
/*
* Get a number of available payloads and get actual total size of
* the payloads' name and metadata arrays.
*
* This functions is typically executed first before the xc_livepatch_list()
* to obtain the sizes and correctly allocate all necessary data resources.
*
* The return value is zero if the hypercall completed successfully.
*
* If there was an error performing the sysctl operation, the return value
* will contain the hypercall error code value.
*/
int xc_livepatch_list_get_sizes(xc_interface *xch, unsigned int *nr,
uint32_t *name_total_size,
uint32_t *metadata_total_size)
{
DECLARE_SYSCTL;
int rc;
if ( !nr || !name_total_size || !metadata_total_size )
{
errno = EINVAL;
return -1;
}
memset(&sysctl, 0, sizeof(sysctl));
sysctl.cmd = XEN_SYSCTL_livepatch_op;
sysctl.u.livepatch.cmd = XEN_SYSCTL_LIVEPATCH_LIST;
rc = do_sysctl(xch, &sysctl);
if ( rc )
return rc;
*nr = sysctl.u.livepatch.u.list.nr;
*name_total_size = sysctl.u.livepatch.u.list.name_total_size;
*metadata_total_size = sysctl.u.livepatch.u.list.metadata_total_size;
return 0;
}
/*
* The heart of this function is to get an array of the following objects:
* - xen_livepatch_status_t: states and return codes of payloads
* - name: names of payloads
* - len: lengths of corresponding payloads' names
* - metadata: payloads' metadata
* - metadata_len: lengths of corresponding payloads' metadata
*
* 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 first issue the
* xc_livepatch_list_get_sizes() in order to obtain total sizes of names
* and all metadata as well as the current number of payload entries.
* The total sizes are required and supplied via the 'name_total_size' and
* 'metadata_total_size' parameters.
*
* The 'max' is to be provided by the caller with the maximum number of
* entries that 'info', 'name', 'len', 'metadata' and 'metadata_len' arrays
* can be filled up with.
*
* Each entry in the 'info' array is expected to be of xen_livepatch_status_t
* structure size.
*
* Each entry in the 'name' array may have an arbitrary size.
*
* Each entry in the 'len' array is expected to be of uint32_t size.
*
* Each entry in the 'metadata' array may have an arbitrary size.
*
* Each entry in the 'metadata_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, const unsigned int max,
const unsigned int start,
struct xen_livepatch_status *info,
char *name, uint32_t *len,
const uint32_t name_total_size,
char *metadata, uint32_t *metadata_len,
const uint32_t metadata_total_size,
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);
DECLARE_HYPERCALL_BOUNCE(metadata, 0, XC_HYPERCALL_BUFFER_BOUNCE_OUT);
DECLARE_HYPERCALL_BOUNCE(metadata_len, 0, XC_HYPERCALL_BUFFER_BOUNCE_OUT);
uint32_t max_batch_sz, nr;
uint32_t version = 0, retries = 0;
uint32_t adjust = 0;
uint32_t name_off = 0, metadata_off = 0;
uint32_t name_sz, metadata_sz;
if ( !max || !info || !name || !len ||
!metadata || !metadata_len || !done || !left )
{
errno = EINVAL;
return -1;
}
if ( name_total_size == 0 )
{
errno = ENOENT;
return -1;
}
memset(&sysctl, 0, sizeof(sysctl));
sysctl.cmd = XEN_SYSCTL_livepatch_op;
sysctl.u.livepatch.cmd = XEN_SYSCTL_LIVEPATCH_LIST;
sysctl.u.livepatch.u.list.idx = start;
max_batch_sz = max;
name_sz = name_total_size;
metadata_sz = metadata_total_size;
*done = 0;
*left = 0;
do {
uint32_t _name_sz, _metadata_sz;
/*
* 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, name_sz);
HYPERCALL_BOUNCE_SET_SIZE(len, nr * sizeof(*len));
HYPERCALL_BOUNCE_SET_SIZE(metadata, metadata_sz);
HYPERCALL_BOUNCE_SET_SIZE(metadata_len, nr * sizeof(*metadata_len));
/* Move the pointer to proper offset into 'info'. */
(HYPERCALL_BUFFER(info))->ubuf = info + *done;
(HYPERCALL_BUFFER(name))->ubuf = name + name_off;
(HYPERCALL_BUFFER(len))->ubuf = len + *done;
(HYPERCALL_BUFFER(metadata))->ubuf = metadata + metadata_off;
(HYPERCALL_BUFFER(metadata_len))->ubuf = metadata_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;
rc = xc_hypercall_bounce_pre(xch, metadata);
if ( rc )
break;
rc = xc_hypercall_bounce_pre(xch, metadata_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);
set_xen_guest_handle(sysctl.u.livepatch.u.list.metadata, metadata);
set_xen_guest_handle(sysctl.u.livepatch.u.list.metadata_len, metadata_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);
xc_hypercall_bounce_post(xch, metadata);
xc_hypercall_bounce_post(xch, metadata_len);
continue;
}
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);
xc_hypercall_bounce_post(xch, metadata);
xc_hypercall_bounce_post(xch, metadata_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. */
_name_sz = sysctl.u.livepatch.u.list.name_total_size; /* Total received name size. */
_metadata_sz = sysctl.u.livepatch.u.list.metadata_total_size; /* Total received metadata size. */
/* 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, _name_sz);
HYPERCALL_BOUNCE_SET_SIZE(len, (rc * sizeof(*len)));
HYPERCALL_BOUNCE_SET_SIZE(metadata, _metadata_sz);
HYPERCALL_BOUNCE_SET_SIZE(metadata_len, (rc * sizeof(*metadata_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);
xc_hypercall_bounce_post(xch, metadata);
xc_hypercall_bounce_post(xch, metadata_len);
name_sz -= _name_sz;
name_off += _name_sz;
metadata_sz -= _metadata_sz;
metadata_off += _metadata_sz;
/* 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) );
if ( rc < 0 )
{
xc_hypercall_bounce_post(xch, len);
xc_hypercall_bounce_post(xch, name);
xc_hypercall_bounce_post(xch, info);
xc_hypercall_bounce_post(xch, metadata);
xc_hypercall_bounce_post(xch, metadata_len);
}
return rc > 0 ? 0 : rc;
}
static int _xc_livepatch_action(xc_interface *xch,
char *name,
unsigned int action,
uint32_t timeout,
uint32_t flags)
{
int rc;
DECLARE_SYSCTL;
/* The size is figured out when we strlen(name) */
DECLARE_HYPERCALL_BOUNCE(name, 0, XC_HYPERCALL_BUFFER_BOUNCE_IN);
struct xen_livepatch_name def_name = { };
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_ACTION;
sysctl.u.livepatch.pad = 0;
sysctl.u.livepatch.u.action.cmd = action;
sysctl.u.livepatch.u.action.timeout = timeout;
sysctl.u.livepatch.u.action.flags = flags;
sysctl.u.livepatch.u.action.pad = 0;
sysctl.u.livepatch.u.action.name = def_name;
set_xen_guest_handle(sysctl.u.livepatch.u.action.name.name, name);
rc = do_sysctl(xch, &sysctl);
xc_hypercall_bounce_post(xch, name);
return rc;
}
int xc_livepatch_apply(xc_interface *xch, char *name, uint32_t timeout, uint32_t flags)
{
return _xc_livepatch_action(xch, name, LIVEPATCH_ACTION_APPLY, timeout, flags);
}
int xc_livepatch_revert(xc_interface *xch, char *name, uint32_t timeout, uint32_t flags)
{
return _xc_livepatch_action(xch, name, LIVEPATCH_ACTION_REVERT, timeout, flags);
}
int xc_livepatch_unload(xc_interface *xch, char *name, uint32_t timeout, uint32_t flags)
{
return _xc_livepatch_action(xch, name, LIVEPATCH_ACTION_UNLOAD, timeout, flags);
}
int xc_livepatch_replace(xc_interface *xch, char *name, uint32_t timeout, uint32_t flags)
{
return _xc_livepatch_action(xch, name, LIVEPATCH_ACTION_REPLACE, timeout, flags);
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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