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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v3 5/7] libxl/libxc: Move libxl_get_cpu_topology()'s hypercall buffer management to libxc
On 09/02/15 20:04, Boris Ostrovsky wrote:
> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
> ---
> tools/libxc/include/xenctrl.h | 4 +-
> tools/libxc/xc_misc.c | 23 +++++++++++-----
> tools/libxl/libxl.c | 32 +++++------------------
> tools/misc/xenpm.c | 51
> ++++++++++++++++---------------------
> tools/python/xen/lowlevel/xc/xc.c | 23 ++++++-----------
> 5 files changed, 55 insertions(+), 78 deletions(-)
>
> diff --git a/tools/libxc/include/xenctrl.h b/tools/libxc/include/xenctrl.h
> index 0cb6743..d94571d 100644
> --- a/tools/libxc/include/xenctrl.h
> +++ b/tools/libxc/include/xenctrl.h
> @@ -1226,7 +1226,7 @@ int xc_readconsolering(xc_interface *xch,
> int xc_send_debug_keys(xc_interface *xch, char *keys);
>
> typedef xen_sysctl_physinfo_t xc_physinfo_t;
> -typedef xen_sysctl_cputopoinfo_t xc_cputopoinfo_t;
> +typedef xen_sysctl_cputopo_t xc_cputopo_t;
The sysctl structure is still named xen_sysctl_cputopoinfo_t. Where
does xen_sysctl_cputopo_t come from?
> typedef xen_sysctl_numainfo_t xc_numainfo_t;
>
> typedef uint32_t xc_cpu_to_node_t;
> @@ -1237,7 +1237,7 @@ typedef uint64_t xc_node_to_memfree_t;
> typedef uint32_t xc_node_to_node_dist_t;
>
> int xc_physinfo(xc_interface *xch, xc_physinfo_t *info);
> -int xc_cputopoinfo(xc_interface *xch, xc_cputopoinfo_t *info);
> +int xc_cputopoinfo(xc_interface *xch, int *max_cpus, xc_cputopo_t *cputopo);
max_cpus is the length of the cputopo array, and is therefore an
unsigned value.
~Andrew
> int xc_numainfo(xc_interface *xch, xc_numainfo_t *info);
>
> int xc_sched_id(xc_interface *xch,
> diff --git a/tools/libxc/xc_misc.c b/tools/libxc/xc_misc.c
> index be68291..4c654f3 100644
> --- a/tools/libxc/xc_misc.c
> +++ b/tools/libxc/xc_misc.c
> @@ -177,22 +177,31 @@ int xc_physinfo(xc_interface *xch,
> return 0;
> }
>
> -int xc_cputopoinfo(xc_interface *xch,
> - xc_cputopoinfo_t *put_info)
> +int xc_cputopoinfo(xc_interface *xch, int *max_cpus,
> + xc_cputopo_t *cputopo)
> {
> int ret;
> DECLARE_SYSCTL;
> + DECLARE_HYPERCALL_BOUNCE(cputopo, *max_cpus * sizeof(*cputopo),
> + XC_HYPERCALL_BUFFER_BOUNCE_OUT);
>
> - sysctl.cmd = XEN_SYSCTL_cputopoinfo;
> + if ((ret = xc_hypercall_bounce_pre(xch, cputopo)))
> + goto out;
>
> - memcpy(&sysctl.u.cputopoinfo, put_info, sizeof(*put_info));
> + sysctl.u.cputopoinfo.max_cpu_index = *max_cpus;
> + set_xen_guest_handle(sysctl.u.cputopoinfo.cputopo, cputopo);
> +
> + sysctl.cmd = XEN_SYSCTL_cputopoinfo;
>
> if ( (ret = do_sysctl(xch, &sysctl)) != 0 )
> - return ret;
> + goto out;
>
> - memcpy(put_info, &sysctl.u.cputopoinfo, sizeof(*put_info));
> + *max_cpus = sysctl.u.cputopoinfo.max_cpu_index + 1;
>
> - return 0;
> +out:
> + xc_hypercall_bounce_post(xch, cputopo);
> +
> + return ret;
> }
>
> int xc_numainfo(xc_interface *xch,
> diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
> index b05c0bb..f8d64c2 100644
> --- a/tools/libxl/libxl.c
> +++ b/tools/libxl/libxl.c
> @@ -5072,38 +5072,23 @@ int libxl_get_physinfo(libxl_ctx *ctx, libxl_physinfo
> *physinfo)
> libxl_cputopology *libxl_get_cpu_topology(libxl_ctx *ctx, int *nb_cpu_out)
> {
> GC_INIT(ctx);
> - xc_cputopoinfo_t tinfo;
> - DECLARE_HYPERCALL_BUFFER(xen_sysctl_cputopo_t, cputopo);
> + xc_cputopo_t *cputopo;
> libxl_cputopology *ret = NULL;
> - int i;
> - int max_cpus;
> + int i, max_cpus;
>
> max_cpus = libxl_get_max_cpus(ctx);
> - if (max_cpus < 0)
> - {
> + if (max_cpus < 0) {
> LIBXL__LOG(ctx, XTL_ERROR, "Unable to determine number of CPUS");
> - ret = NULL;
> goto out;
> }
>
> - cputopo = xc_hypercall_buffer_alloc(ctx->xch, cputopo,
> - sizeof(*cputopo) * max_cpus);
> - if (cputopo == NULL) {
> - LIBXL__LOG_ERRNOVAL(ctx, XTL_ERROR, ENOMEM,
> - "Unable to allocate hypercall arguments");
> - goto fail;
> - }
> + cputopo = libxl__zalloc(gc, sizeof(*cputopo) * max_cpus);
>
> - set_xen_guest_handle(tinfo.cputopo, cputopo);
> - tinfo.max_cpu_index = max_cpus - 1;
> - if (xc_cputopoinfo(ctx->xch, &tinfo) != 0) {
> + if (xc_cputopoinfo(ctx->xch, &max_cpus, cputopo) != 0) {
> LIBXL__LOG_ERRNO(ctx, XTL_ERROR, "CPU topology info hypercall
> failed");
> - goto fail;
> + goto out;
> }
>
> - if (tinfo.max_cpu_index < max_cpus - 1)
> - max_cpus = tinfo.max_cpu_index + 1;
> -
> ret = libxl__zalloc(NOGC, sizeof(libxl_cputopology) * max_cpus);
>
> for (i = 0; i < max_cpus; i++) {
> @@ -5115,11 +5100,8 @@ libxl_cputopology *libxl_get_cpu_topology(libxl_ctx
> *ctx, int *nb_cpu_out)
> #undef V
> }
>
> -fail:
> - xc_hypercall_buffer_free(ctx->xch, cputopo);
> + *nb_cpu_out = max_cpus;
>
> - if (ret)
> - *nb_cpu_out = max_cpus;
> out:
> GC_FREE;
> return ret;
> diff --git a/tools/misc/xenpm.c b/tools/misc/xenpm.c
> index f7fe620..1d1eb40 100644
> --- a/tools/misc/xenpm.c
> +++ b/tools/misc/xenpm.c
> @@ -355,12 +355,11 @@ static void signal_int_handler(int signo)
> int i, j, k;
> struct timeval tv;
> int cx_cap = 0, px_cap = 0;
> - DECLARE_HYPERCALL_BUFFER(xen_sysctl_cputopo_t, cputopo);
> - xc_cputopoinfo_t info = { 0 };
> -
> - cputopo = xc_hypercall_buffer_alloc(xc_handle, cputopo,
> - sizeof(*cputopo) * MAX_NR_CPU);
> + xc_cputopo_t *cputopo;
> + int max_cpus;
>
> + max_cpus = MAX_NR_CPU;
> + cputopo = calloc(max_cpus, sizeof(*cputopo));
> if ( cputopo == NULL )
> {
> fprintf(stderr, "failed to allocate hypercall buffers\n");
> @@ -445,29 +444,26 @@ static void signal_int_handler(int signo)
> printf(" Avg freq\t%d\tKHz\n", avgfreq[i]);
> }
>
> - set_xen_guest_handle(info.cputopo, cputopo);
> - info.max_cpu_index = MAX_NR_CPU - 1;
> -
> - if ( cx_cap && !xc_cputopoinfo(xc_handle, &info) )
> + if ( cx_cap && !xc_cputopoinfo(xc_handle, &max_cpus, cputopo) )
> {
> uint32_t socket_ids[MAX_NR_CPU];
> uint32_t core_ids[MAX_NR_CPU];
> uint32_t socket_nr = 0;
> uint32_t core_nr = 0;
>
> - if ( info.max_cpu_index > MAX_NR_CPU - 1 )
> - info.max_cpu_index = MAX_NR_CPU - 1;
> + if ( max_cpus > MAX_NR_CPU )
> + max_cpus = MAX_NR_CPU;
> /* check validity */
> - for ( i = 0; i <= info.max_cpu_index; i++ )
> + for ( i = 0; i < max_cpus; i++ )
> {
> if ( cputopo[i].core == INVALID_CORE_ID ||
> cputopo[i].socket == INVALID_SOCKET_ID )
> break;
> }
> - if ( i > info.max_cpu_index )
> + if ( i >= max_cpus )
> {
> /* find socket nr & core nr per socket */
> - for ( i = 0; i <= info.max_cpu_index; i++ )
> + for ( i = 0; i < max_cpus; i++ )
> {
> for ( j = 0; j < socket_nr; j++ )
> if ( cputopo[i].socket == socket_ids[j] )
> @@ -494,7 +490,7 @@ static void signal_int_handler(int signo)
> unsigned int n;
> uint64_t res;
>
> - for ( j = 0; j <= info.max_cpu_index; j++ )
> + for ( j = 0; j < max_cpus; j++ )
> {
> if ( cputopo[j].socket == socket_ids[i] )
> break;
> @@ -513,7 +509,7 @@ static void signal_int_handler(int signo)
> }
> for ( k = 0; k < core_nr; k++ )
> {
> - for ( j = 0; j <= info.max_cpu_index; j++ )
> + for ( j = 0; j < max_cpus; j++ )
> {
> if ( cputopo[j].socket == socket_ids[i] &&
> cputopo[j].core == core_ids[k] )
> @@ -551,7 +547,7 @@ static void signal_int_handler(int signo)
> free(sum);
> free(avgfreq);
> out:
> - xc_hypercall_buffer_free(xc_handle, cputopo);
> + free(cputopo);
> xc_interface_close(xc_handle);
> exit(0);
> }
> @@ -958,22 +954,19 @@ void scaling_governor_func(int argc, char *argv[])
>
> void cpu_topology_func(int argc, char *argv[])
> {
> - DECLARE_HYPERCALL_BUFFER(xen_sysctl_cputopo_t, cputopo);
> - xc_cputopoinfo_t info = { 0 };
> + xc_cputopo_t *cputopo;
> + int max_cpus;
> int i, rc = ENOMEM;
>
> - cputopo = xc_hypercall_buffer_alloc(xc_handle, cputopo,
> - sizeof(*cputopo) * MAX_NR_CPU);
> + max_cpus = MAX_NR_CPU;
> + cputopo = calloc(max_cpus, sizeof(*cputopo));
> if ( cputopo == NULL )
> {
> fprintf(stderr, "failed to allocate hypercall buffers\n");
> goto out;
> }
>
> - set_xen_guest_handle(info.cputopo, cputopo);
> - info.max_cpu_index = MAX_NR_CPU-1;
> -
> - if ( xc_cputopoinfo(xc_handle, &info) )
> + if ( xc_cputopoinfo(xc_handle, &max_cpus, cputopo) )
> {
> rc = errno;
> fprintf(stderr, "Cannot get Xen CPU topology (%d - %s)\n",
> @@ -981,11 +974,11 @@ void cpu_topology_func(int argc, char *argv[])
> goto out;
> }
>
> - if ( info.max_cpu_index > (MAX_NR_CPU-1) )
> - info.max_cpu_index = MAX_NR_CPU-1;
> + if ( max_cpus > MAX_NR_CPU )
> + max_cpus = MAX_NR_CPU;
>
> printf("CPU\tcore\tsocket\tnode\n");
> - for ( i = 0; i <= info.max_cpu_index; i++ )
> + for ( i = 0; i < max_cpus; i++ )
> {
> if ( cputopo[i].core == INVALID_CORE_ID )
> continue;
> @@ -994,7 +987,7 @@ void cpu_topology_func(int argc, char *argv[])
> }
> rc = 0;
> out:
> - xc_hypercall_buffer_free(xc_handle, cputopo);
> + free(cputopo);
> if ( rc )
> exit(rc);
> }
> diff --git a/tools/python/xen/lowlevel/xc/xc.c
> b/tools/python/xen/lowlevel/xc/xc.c
> index 4275968..6e49dc5 100644
> --- a/tools/python/xen/lowlevel/xc/xc.c
> +++ b/tools/python/xen/lowlevel/xc/xc.c
> @@ -1221,31 +1221,24 @@ static PyObject *pyxc_getcpuinfo(XcObject *self,
> PyObject *args, PyObject *kwds)
> static PyObject *pyxc_topologyinfo(XcObject *self)
> {
> #define MAX_CPU_INDEX 255
> - xc_cputopoinfo_t tinfo = { 0 };
> - int i, max_cpu_index;
> + xc_cputopo_t *cputopo;
> + int i, max_cpus;
> PyObject *ret_obj = NULL;
> PyObject *cpu_to_core_obj, *cpu_to_socket_obj, *cpu_to_node_obj;
>
> - DECLARE_HYPERCALL_BUFFER(xen_sysctl_cputopo_t, cputopo);
> -
> - cputopo = xc_hypercall_buffer_alloc(self->xc_handle, cputopo,
> sizeof(*cputopo) * (MAX_CPU_INDEX+1));
> + max_cpus = MAX_CPU_INDEX + 1;
> + cputopo = calloc(max_cpus, sizeof(*cputopo));
> if ( cputopo == NULL )
> goto out;
> - set_xen_guest_handle(tinfo.cputopo, cputopo);
> - tinfo.max_cpu_index = MAX_CPU_INDEX;
>
> - if ( xc_cputopoinfo(self->xc_handle, &tinfo) != 0 )
> + if ( xc_cputopoinfo(self->xc_handle, &max_cpus, cputopo) != 0 )
> goto out;
>
> - max_cpu_index = tinfo.max_cpu_index;
> - if ( max_cpu_index > MAX_CPU_INDEX )
> - max_cpu_index = MAX_CPU_INDEX;
> -
> /* Construct cpu-to-* lists. */
> cpu_to_core_obj = PyList_New(0);
> cpu_to_socket_obj = PyList_New(0);
> cpu_to_node_obj = PyList_New(0);
> - for ( i = 0; i <= max_cpu_index; i++ )
> + for ( i = 0; i < max_cpus; i++ )
> {
> if ( cputopo[i].core == INVALID_CORE_ID )
> {
> @@ -1281,7 +1274,7 @@ static PyObject *pyxc_topologyinfo(XcObject *self)
> }
> }
>
> - ret_obj = Py_BuildValue("{s:i}", "max_cpu_index", max_cpu_index);
> + ret_obj = Py_BuildValue("{s:i}", "max_cpu_index", max_cpus - 1);
>
> PyDict_SetItemString(ret_obj, "cpu_to_core", cpu_to_core_obj);
> Py_DECREF(cpu_to_core_obj);
> @@ -1293,7 +1286,7 @@ static PyObject *pyxc_topologyinfo(XcObject *self)
> Py_DECREF(cpu_to_node_obj);
>
> out:
> - xc_hypercall_buffer_free(self->xc_handle, cputopo);
> + free(cputopo);
> return ret_obj ? ret_obj : pyxc_error_to_exception(self->xc_handle);
> #undef MAX_CPU_INDEX
> }
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