cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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sys-hypervisor.c (12761B)


      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 *  copyright (c) 2006 IBM Corporation
      4 *  Authored by: Mike D. Day <ncmike@us.ibm.com>
      5 */
      6
      7#include <linux/slab.h>
      8#include <linux/kernel.h>
      9#include <linux/init.h>
     10#include <linux/kobject.h>
     11#include <linux/err.h>
     12
     13#include <asm/xen/hypervisor.h>
     14#include <asm/xen/hypercall.h>
     15
     16#include <xen/xen.h>
     17#include <xen/xenbus.h>
     18#include <xen/interface/xen.h>
     19#include <xen/interface/version.h>
     20#ifdef CONFIG_XEN_HAVE_VPMU
     21#include <xen/interface/xenpmu.h>
     22#endif
     23
     24#define HYPERVISOR_ATTR_RO(_name) \
     25static struct hyp_sysfs_attr _name##_attr = __ATTR_RO(_name)
     26
     27#define HYPERVISOR_ATTR_RW(_name) \
     28static struct hyp_sysfs_attr _name##_attr = __ATTR_RW(_name)
     29
     30struct hyp_sysfs_attr {
     31	struct attribute attr;
     32	ssize_t (*show)(struct hyp_sysfs_attr *, char *);
     33	ssize_t (*store)(struct hyp_sysfs_attr *, const char *, size_t);
     34	void *hyp_attr_data;
     35};
     36
     37static ssize_t type_show(struct hyp_sysfs_attr *attr, char *buffer)
     38{
     39	return sprintf(buffer, "xen\n");
     40}
     41
     42HYPERVISOR_ATTR_RO(type);
     43
     44static int __init xen_sysfs_type_init(void)
     45{
     46	return sysfs_create_file(hypervisor_kobj, &type_attr.attr);
     47}
     48
     49static ssize_t guest_type_show(struct hyp_sysfs_attr *attr, char *buffer)
     50{
     51	const char *type;
     52
     53	switch (xen_domain_type) {
     54	case XEN_NATIVE:
     55		/* ARM only. */
     56		type = "Xen";
     57		break;
     58	case XEN_PV_DOMAIN:
     59		type = "PV";
     60		break;
     61	case XEN_HVM_DOMAIN:
     62		type = xen_pvh_domain() ? "PVH" : "HVM";
     63		break;
     64	default:
     65		return -EINVAL;
     66	}
     67
     68	return sprintf(buffer, "%s\n", type);
     69}
     70
     71HYPERVISOR_ATTR_RO(guest_type);
     72
     73static int __init xen_sysfs_guest_type_init(void)
     74{
     75	return sysfs_create_file(hypervisor_kobj, &guest_type_attr.attr);
     76}
     77
     78/* xen version attributes */
     79static ssize_t major_show(struct hyp_sysfs_attr *attr, char *buffer)
     80{
     81	int version = HYPERVISOR_xen_version(XENVER_version, NULL);
     82	if (version)
     83		return sprintf(buffer, "%d\n", version >> 16);
     84	return -ENODEV;
     85}
     86
     87HYPERVISOR_ATTR_RO(major);
     88
     89static ssize_t minor_show(struct hyp_sysfs_attr *attr, char *buffer)
     90{
     91	int version = HYPERVISOR_xen_version(XENVER_version, NULL);
     92	if (version)
     93		return sprintf(buffer, "%d\n", version & 0xff);
     94	return -ENODEV;
     95}
     96
     97HYPERVISOR_ATTR_RO(minor);
     98
     99static ssize_t extra_show(struct hyp_sysfs_attr *attr, char *buffer)
    100{
    101	int ret = -ENOMEM;
    102	char *extra;
    103
    104	extra = kmalloc(XEN_EXTRAVERSION_LEN, GFP_KERNEL);
    105	if (extra) {
    106		ret = HYPERVISOR_xen_version(XENVER_extraversion, extra);
    107		if (!ret)
    108			ret = sprintf(buffer, "%s\n", extra);
    109		kfree(extra);
    110	}
    111
    112	return ret;
    113}
    114
    115HYPERVISOR_ATTR_RO(extra);
    116
    117static struct attribute *version_attrs[] = {
    118	&major_attr.attr,
    119	&minor_attr.attr,
    120	&extra_attr.attr,
    121	NULL
    122};
    123
    124static const struct attribute_group version_group = {
    125	.name = "version",
    126	.attrs = version_attrs,
    127};
    128
    129static int __init xen_sysfs_version_init(void)
    130{
    131	return sysfs_create_group(hypervisor_kobj, &version_group);
    132}
    133
    134/* UUID */
    135
    136static ssize_t uuid_show_fallback(struct hyp_sysfs_attr *attr, char *buffer)
    137{
    138	char *vm, *val;
    139	int ret;
    140	extern int xenstored_ready;
    141
    142	if (!xenstored_ready)
    143		return -EBUSY;
    144
    145	vm = xenbus_read(XBT_NIL, "vm", "", NULL);
    146	if (IS_ERR(vm))
    147		return PTR_ERR(vm);
    148	val = xenbus_read(XBT_NIL, vm, "uuid", NULL);
    149	kfree(vm);
    150	if (IS_ERR(val))
    151		return PTR_ERR(val);
    152	ret = sprintf(buffer, "%s\n", val);
    153	kfree(val);
    154	return ret;
    155}
    156
    157static ssize_t uuid_show(struct hyp_sysfs_attr *attr, char *buffer)
    158{
    159	xen_domain_handle_t uuid;
    160	int ret;
    161	ret = HYPERVISOR_xen_version(XENVER_guest_handle, uuid);
    162	if (ret)
    163		return uuid_show_fallback(attr, buffer);
    164	ret = sprintf(buffer, "%pU\n", uuid);
    165	return ret;
    166}
    167
    168HYPERVISOR_ATTR_RO(uuid);
    169
    170static int __init xen_sysfs_uuid_init(void)
    171{
    172	return sysfs_create_file(hypervisor_kobj, &uuid_attr.attr);
    173}
    174
    175/* xen compilation attributes */
    176
    177static ssize_t compiler_show(struct hyp_sysfs_attr *attr, char *buffer)
    178{
    179	int ret = -ENOMEM;
    180	struct xen_compile_info *info;
    181
    182	info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
    183	if (info) {
    184		ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
    185		if (!ret)
    186			ret = sprintf(buffer, "%s\n", info->compiler);
    187		kfree(info);
    188	}
    189
    190	return ret;
    191}
    192
    193HYPERVISOR_ATTR_RO(compiler);
    194
    195static ssize_t compiled_by_show(struct hyp_sysfs_attr *attr, char *buffer)
    196{
    197	int ret = -ENOMEM;
    198	struct xen_compile_info *info;
    199
    200	info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
    201	if (info) {
    202		ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
    203		if (!ret)
    204			ret = sprintf(buffer, "%s\n", info->compile_by);
    205		kfree(info);
    206	}
    207
    208	return ret;
    209}
    210
    211HYPERVISOR_ATTR_RO(compiled_by);
    212
    213static ssize_t compile_date_show(struct hyp_sysfs_attr *attr, char *buffer)
    214{
    215	int ret = -ENOMEM;
    216	struct xen_compile_info *info;
    217
    218	info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
    219	if (info) {
    220		ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
    221		if (!ret)
    222			ret = sprintf(buffer, "%s\n", info->compile_date);
    223		kfree(info);
    224	}
    225
    226	return ret;
    227}
    228
    229HYPERVISOR_ATTR_RO(compile_date);
    230
    231static struct attribute *xen_compile_attrs[] = {
    232	&compiler_attr.attr,
    233	&compiled_by_attr.attr,
    234	&compile_date_attr.attr,
    235	NULL
    236};
    237
    238static const struct attribute_group xen_compilation_group = {
    239	.name = "compilation",
    240	.attrs = xen_compile_attrs,
    241};
    242
    243static int __init xen_sysfs_compilation_init(void)
    244{
    245	return sysfs_create_group(hypervisor_kobj, &xen_compilation_group);
    246}
    247
    248/* xen properties info */
    249
    250static ssize_t capabilities_show(struct hyp_sysfs_attr *attr, char *buffer)
    251{
    252	int ret = -ENOMEM;
    253	char *caps;
    254
    255	caps = kmalloc(XEN_CAPABILITIES_INFO_LEN, GFP_KERNEL);
    256	if (caps) {
    257		ret = HYPERVISOR_xen_version(XENVER_capabilities, caps);
    258		if (!ret)
    259			ret = sprintf(buffer, "%s\n", caps);
    260		kfree(caps);
    261	}
    262
    263	return ret;
    264}
    265
    266HYPERVISOR_ATTR_RO(capabilities);
    267
    268static ssize_t changeset_show(struct hyp_sysfs_attr *attr, char *buffer)
    269{
    270	int ret = -ENOMEM;
    271	char *cset;
    272
    273	cset = kmalloc(XEN_CHANGESET_INFO_LEN, GFP_KERNEL);
    274	if (cset) {
    275		ret = HYPERVISOR_xen_version(XENVER_changeset, cset);
    276		if (!ret)
    277			ret = sprintf(buffer, "%s\n", cset);
    278		kfree(cset);
    279	}
    280
    281	return ret;
    282}
    283
    284HYPERVISOR_ATTR_RO(changeset);
    285
    286static ssize_t virtual_start_show(struct hyp_sysfs_attr *attr, char *buffer)
    287{
    288	int ret = -ENOMEM;
    289	struct xen_platform_parameters *parms;
    290
    291	parms = kmalloc(sizeof(struct xen_platform_parameters), GFP_KERNEL);
    292	if (parms) {
    293		ret = HYPERVISOR_xen_version(XENVER_platform_parameters,
    294					     parms);
    295		if (!ret)
    296			ret = sprintf(buffer, "%"PRI_xen_ulong"\n",
    297				      parms->virt_start);
    298		kfree(parms);
    299	}
    300
    301	return ret;
    302}
    303
    304HYPERVISOR_ATTR_RO(virtual_start);
    305
    306static ssize_t pagesize_show(struct hyp_sysfs_attr *attr, char *buffer)
    307{
    308	int ret;
    309
    310	ret = HYPERVISOR_xen_version(XENVER_pagesize, NULL);
    311	if (ret > 0)
    312		ret = sprintf(buffer, "%x\n", ret);
    313
    314	return ret;
    315}
    316
    317HYPERVISOR_ATTR_RO(pagesize);
    318
    319static ssize_t xen_feature_show(int index, char *buffer)
    320{
    321	ssize_t ret;
    322	struct xen_feature_info info;
    323
    324	info.submap_idx = index;
    325	ret = HYPERVISOR_xen_version(XENVER_get_features, &info);
    326	if (!ret)
    327		ret = sprintf(buffer, "%08x", info.submap);
    328
    329	return ret;
    330}
    331
    332static ssize_t features_show(struct hyp_sysfs_attr *attr, char *buffer)
    333{
    334	ssize_t len;
    335	int i;
    336
    337	len = 0;
    338	for (i = XENFEAT_NR_SUBMAPS-1; i >= 0; i--) {
    339		int ret = xen_feature_show(i, buffer + len);
    340		if (ret < 0) {
    341			if (len == 0)
    342				len = ret;
    343			break;
    344		}
    345		len += ret;
    346	}
    347	if (len > 0)
    348		buffer[len++] = '\n';
    349
    350	return len;
    351}
    352
    353HYPERVISOR_ATTR_RO(features);
    354
    355static ssize_t buildid_show(struct hyp_sysfs_attr *attr, char *buffer)
    356{
    357	ssize_t ret;
    358	struct xen_build_id *buildid;
    359
    360	ret = HYPERVISOR_xen_version(XENVER_build_id, NULL);
    361	if (ret < 0) {
    362		if (ret == -EPERM)
    363			ret = sprintf(buffer, "<denied>");
    364		return ret;
    365	}
    366
    367	buildid = kmalloc(sizeof(*buildid) + ret, GFP_KERNEL);
    368	if (!buildid)
    369		return -ENOMEM;
    370
    371	buildid->len = ret;
    372	ret = HYPERVISOR_xen_version(XENVER_build_id, buildid);
    373	if (ret > 0)
    374		ret = sprintf(buffer, "%s", buildid->buf);
    375	kfree(buildid);
    376
    377	return ret;
    378}
    379
    380HYPERVISOR_ATTR_RO(buildid);
    381
    382static struct attribute *xen_properties_attrs[] = {
    383	&capabilities_attr.attr,
    384	&changeset_attr.attr,
    385	&virtual_start_attr.attr,
    386	&pagesize_attr.attr,
    387	&features_attr.attr,
    388	&buildid_attr.attr,
    389	NULL
    390};
    391
    392static const struct attribute_group xen_properties_group = {
    393	.name = "properties",
    394	.attrs = xen_properties_attrs,
    395};
    396
    397static int __init xen_sysfs_properties_init(void)
    398{
    399	return sysfs_create_group(hypervisor_kobj, &xen_properties_group);
    400}
    401
    402#ifdef CONFIG_XEN_HAVE_VPMU
    403struct pmu_mode {
    404	const char *name;
    405	uint32_t mode;
    406};
    407
    408static struct pmu_mode pmu_modes[] = {
    409	{"off", XENPMU_MODE_OFF},
    410	{"self", XENPMU_MODE_SELF},
    411	{"hv", XENPMU_MODE_HV},
    412	{"all", XENPMU_MODE_ALL}
    413};
    414
    415static ssize_t pmu_mode_store(struct hyp_sysfs_attr *attr,
    416			      const char *buffer, size_t len)
    417{
    418	int ret;
    419	struct xen_pmu_params xp;
    420	int i;
    421
    422	for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) {
    423		if (strncmp(buffer, pmu_modes[i].name, len - 1) == 0) {
    424			xp.val = pmu_modes[i].mode;
    425			break;
    426		}
    427	}
    428
    429	if (i == ARRAY_SIZE(pmu_modes))
    430		return -EINVAL;
    431
    432	xp.version.maj = XENPMU_VER_MAJ;
    433	xp.version.min = XENPMU_VER_MIN;
    434	ret = HYPERVISOR_xenpmu_op(XENPMU_mode_set, &xp);
    435	if (ret)
    436		return ret;
    437
    438	return len;
    439}
    440
    441static ssize_t pmu_mode_show(struct hyp_sysfs_attr *attr, char *buffer)
    442{
    443	int ret;
    444	struct xen_pmu_params xp;
    445	int i;
    446	uint32_t mode;
    447
    448	xp.version.maj = XENPMU_VER_MAJ;
    449	xp.version.min = XENPMU_VER_MIN;
    450	ret = HYPERVISOR_xenpmu_op(XENPMU_mode_get, &xp);
    451	if (ret)
    452		return ret;
    453
    454	mode = (uint32_t)xp.val;
    455	for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) {
    456		if (mode == pmu_modes[i].mode)
    457			return sprintf(buffer, "%s\n", pmu_modes[i].name);
    458	}
    459
    460	return -EINVAL;
    461}
    462HYPERVISOR_ATTR_RW(pmu_mode);
    463
    464static ssize_t pmu_features_store(struct hyp_sysfs_attr *attr,
    465				  const char *buffer, size_t len)
    466{
    467	int ret;
    468	uint32_t features;
    469	struct xen_pmu_params xp;
    470
    471	ret = kstrtou32(buffer, 0, &features);
    472	if (ret)
    473		return ret;
    474
    475	xp.val = features;
    476	xp.version.maj = XENPMU_VER_MAJ;
    477	xp.version.min = XENPMU_VER_MIN;
    478	ret = HYPERVISOR_xenpmu_op(XENPMU_feature_set, &xp);
    479	if (ret)
    480		return ret;
    481
    482	return len;
    483}
    484
    485static ssize_t pmu_features_show(struct hyp_sysfs_attr *attr, char *buffer)
    486{
    487	int ret;
    488	struct xen_pmu_params xp;
    489
    490	xp.version.maj = XENPMU_VER_MAJ;
    491	xp.version.min = XENPMU_VER_MIN;
    492	ret = HYPERVISOR_xenpmu_op(XENPMU_feature_get, &xp);
    493	if (ret)
    494		return ret;
    495
    496	return sprintf(buffer, "0x%x\n", (uint32_t)xp.val);
    497}
    498HYPERVISOR_ATTR_RW(pmu_features);
    499
    500static struct attribute *xen_pmu_attrs[] = {
    501	&pmu_mode_attr.attr,
    502	&pmu_features_attr.attr,
    503	NULL
    504};
    505
    506static const struct attribute_group xen_pmu_group = {
    507	.name = "pmu",
    508	.attrs = xen_pmu_attrs,
    509};
    510
    511static int __init xen_sysfs_pmu_init(void)
    512{
    513	return sysfs_create_group(hypervisor_kobj, &xen_pmu_group);
    514}
    515#endif
    516
    517static int __init hyper_sysfs_init(void)
    518{
    519	int ret;
    520
    521	if (!xen_domain())
    522		return -ENODEV;
    523
    524	ret = xen_sysfs_type_init();
    525	if (ret)
    526		goto out;
    527	ret = xen_sysfs_guest_type_init();
    528	if (ret)
    529		goto guest_type_out;
    530	ret = xen_sysfs_version_init();
    531	if (ret)
    532		goto version_out;
    533	ret = xen_sysfs_compilation_init();
    534	if (ret)
    535		goto comp_out;
    536	ret = xen_sysfs_uuid_init();
    537	if (ret)
    538		goto uuid_out;
    539	ret = xen_sysfs_properties_init();
    540	if (ret)
    541		goto prop_out;
    542#ifdef CONFIG_XEN_HAVE_VPMU
    543	if (xen_initial_domain()) {
    544		ret = xen_sysfs_pmu_init();
    545		if (ret) {
    546			sysfs_remove_group(hypervisor_kobj,
    547					   &xen_properties_group);
    548			goto prop_out;
    549		}
    550	}
    551#endif
    552	goto out;
    553
    554prop_out:
    555	sysfs_remove_file(hypervisor_kobj, &uuid_attr.attr);
    556uuid_out:
    557	sysfs_remove_group(hypervisor_kobj, &xen_compilation_group);
    558comp_out:
    559	sysfs_remove_group(hypervisor_kobj, &version_group);
    560version_out:
    561	sysfs_remove_file(hypervisor_kobj, &guest_type_attr.attr);
    562guest_type_out:
    563	sysfs_remove_file(hypervisor_kobj, &type_attr.attr);
    564out:
    565	return ret;
    566}
    567device_initcall(hyper_sysfs_init);
    568
    569static ssize_t hyp_sysfs_show(struct kobject *kobj,
    570			      struct attribute *attr,
    571			      char *buffer)
    572{
    573	struct hyp_sysfs_attr *hyp_attr;
    574	hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
    575	if (hyp_attr->show)
    576		return hyp_attr->show(hyp_attr, buffer);
    577	return 0;
    578}
    579
    580static ssize_t hyp_sysfs_store(struct kobject *kobj,
    581			       struct attribute *attr,
    582			       const char *buffer,
    583			       size_t len)
    584{
    585	struct hyp_sysfs_attr *hyp_attr;
    586	hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
    587	if (hyp_attr->store)
    588		return hyp_attr->store(hyp_attr, buffer, len);
    589	return 0;
    590}
    591
    592static const struct sysfs_ops hyp_sysfs_ops = {
    593	.show = hyp_sysfs_show,
    594	.store = hyp_sysfs_store,
    595};
    596
    597static struct kobj_type hyp_sysfs_kobj_type = {
    598	.sysfs_ops = &hyp_sysfs_ops,
    599};
    600
    601static int __init hypervisor_subsys_init(void)
    602{
    603	if (!xen_domain())
    604		return -ENODEV;
    605
    606	hypervisor_kobj->ktype = &hyp_sysfs_kobj_type;
    607	return 0;
    608}
    609device_initcall(hypervisor_subsys_init);