diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2015-09-08 18:46:48 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-09-08 18:46:48 (GMT) |
commit | 752240e74d650faa24425adc523f1308973ea51c (patch) | |
tree | 47657b7d468352424f844156883302653252f70e /drivers | |
parent | b8cb642af98216fe6eeca1525345b8a5c9d7c9a4 (diff) | |
parent | 626d7508664c4bc8e67f496da4387ecd0c410b8c (diff) | |
download | linux-752240e74d650faa24425adc523f1308973ea51c.tar.xz |
Merge tag 'for-linus-4.3-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen updates from David Vrabel:
"Xen features and fixes for 4.3:
- Convert xen-blkfront to the multiqueue API
- [arm] Support binding event channels to different VCPUs.
- [x86] Support > 512 GiB in a PV guests (off by default as such a
guest cannot be migrated with the current toolstack).
- [x86] PMU support for PV dom0 (limited support for using perf with
Xen and other guests)"
* tag 'for-linus-4.3-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: (33 commits)
xen: switch extra memory accounting to use pfns
xen: limit memory to architectural maximum
xen: avoid another early crash of memory limited dom0
xen: avoid early crash of memory limited dom0
arm/xen: Remove helpers which are PV specific
xen/x86: Don't try to set PCE bit in CR4
xen/PMU: PMU emulation code
xen/PMU: Intercept PMU-related MSR and APIC accesses
xen/PMU: Describe vendor-specific PMU registers
xen/PMU: Initialization code for Xen PMU
xen/PMU: Sysfs interface for setting Xen PMU mode
xen: xensyms support
xen: remove no longer needed p2m.h
xen: allow more than 512 GB of RAM for 64 bit pv-domains
xen: move p2m list if conflicting with e820 map
xen: add explicit memblock_reserve() calls for special pages
mm: provide early_memremap_ro to establish read-only mapping
xen: check for initrd conflicting with e820 map
xen: check pre-allocated page tables for conflict with memory map
xen: check for kernel memory conflicting with memory layout
...
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/block/xen-blkfront.c | 146 | ||||
-rw-r--r-- | drivers/xen/Kconfig | 11 | ||||
-rw-r--r-- | drivers/xen/balloon.c | 6 | ||||
-rw-r--r-- | drivers/xen/events/events_base.c | 6 | ||||
-rw-r--r-- | drivers/xen/sys-hypervisor.c | 136 | ||||
-rw-r--r-- | drivers/xen/xenfs/Makefile | 1 | ||||
-rw-r--r-- | drivers/xen/xenfs/super.c | 3 | ||||
-rw-r--r-- | drivers/xen/xenfs/xenfs.h | 1 | ||||
-rw-r--r-- | drivers/xen/xenfs/xensyms.c | 152 |
9 files changed, 367 insertions, 95 deletions
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index 5f6b3be..1508353 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -37,6 +37,7 @@ #include <linux/interrupt.h> #include <linux/blkdev.h> +#include <linux/blk-mq.h> #include <linux/hdreg.h> #include <linux/cdrom.h> #include <linux/module.h> @@ -147,6 +148,7 @@ struct blkfront_info unsigned int feature_persistent:1; unsigned int max_indirect_segments; int is_ready; + struct blk_mq_tag_set tag_set; }; static unsigned int nr_minors; @@ -616,54 +618,41 @@ static inline bool blkif_request_flush_invalid(struct request *req, !(info->feature_flush & REQ_FUA))); } -/* - * do_blkif_request - * read a block; request is in a request queue - */ -static void do_blkif_request(struct request_queue *rq) +static int blkif_queue_rq(struct blk_mq_hw_ctx *hctx, + const struct blk_mq_queue_data *qd) { - struct blkfront_info *info = NULL; - struct request *req; - int queued; - - pr_debug("Entered do_blkif_request\n"); - - queued = 0; + struct blkfront_info *info = qd->rq->rq_disk->private_data; - while ((req = blk_peek_request(rq)) != NULL) { - info = req->rq_disk->private_data; - - if (RING_FULL(&info->ring)) - goto wait; + blk_mq_start_request(qd->rq); + spin_lock_irq(&info->io_lock); + if (RING_FULL(&info->ring)) + goto out_busy; - blk_start_request(req); + if (blkif_request_flush_invalid(qd->rq, info)) + goto out_err; - if (blkif_request_flush_invalid(req, info)) { - __blk_end_request_all(req, -EOPNOTSUPP); - continue; - } + if (blkif_queue_request(qd->rq)) + goto out_busy; - pr_debug("do_blk_req %p: cmd %p, sec %lx, " - "(%u/%u) [%s]\n", - req, req->cmd, (unsigned long)blk_rq_pos(req), - blk_rq_cur_sectors(req), blk_rq_sectors(req), - rq_data_dir(req) ? "write" : "read"); - - if (blkif_queue_request(req)) { - blk_requeue_request(rq, req); -wait: - /* Avoid pointless unplugs. */ - blk_stop_queue(rq); - break; - } + flush_requests(info); + spin_unlock_irq(&info->io_lock); + return BLK_MQ_RQ_QUEUE_OK; - queued++; - } +out_err: + spin_unlock_irq(&info->io_lock); + return BLK_MQ_RQ_QUEUE_ERROR; - if (queued != 0) - flush_requests(info); +out_busy: + spin_unlock_irq(&info->io_lock); + blk_mq_stop_hw_queue(hctx); + return BLK_MQ_RQ_QUEUE_BUSY; } +static struct blk_mq_ops blkfront_mq_ops = { + .queue_rq = blkif_queue_rq, + .map_queue = blk_mq_map_queue, +}; + static int xlvbd_init_blk_queue(struct gendisk *gd, u16 sector_size, unsigned int physical_sector_size, unsigned int segments) @@ -671,9 +660,22 @@ static int xlvbd_init_blk_queue(struct gendisk *gd, u16 sector_size, struct request_queue *rq; struct blkfront_info *info = gd->private_data; - rq = blk_init_queue(do_blkif_request, &info->io_lock); - if (rq == NULL) + memset(&info->tag_set, 0, sizeof(info->tag_set)); + info->tag_set.ops = &blkfront_mq_ops; + info->tag_set.nr_hw_queues = 1; + info->tag_set.queue_depth = BLK_RING_SIZE(info); + info->tag_set.numa_node = NUMA_NO_NODE; + info->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_SG_MERGE; + info->tag_set.cmd_size = 0; + info->tag_set.driver_data = info; + + if (blk_mq_alloc_tag_set(&info->tag_set)) return -1; + rq = blk_mq_init_queue(&info->tag_set); + if (IS_ERR(rq)) { + blk_mq_free_tag_set(&info->tag_set); + return -1; + } queue_flag_set_unlocked(QUEUE_FLAG_VIRT, rq); @@ -901,19 +903,15 @@ static int xlvbd_alloc_gendisk(blkif_sector_t capacity, static void xlvbd_release_gendisk(struct blkfront_info *info) { unsigned int minor, nr_minors; - unsigned long flags; if (info->rq == NULL) return; - spin_lock_irqsave(&info->io_lock, flags); - /* No more blkif_request(). */ - blk_stop_queue(info->rq); + blk_mq_stop_hw_queues(info->rq); /* No more gnttab callback work. */ gnttab_cancel_free_callback(&info->callback); - spin_unlock_irqrestore(&info->io_lock, flags); /* Flush gnttab callback work. Must be done with no locks held. */ flush_work(&info->work); @@ -925,20 +923,18 @@ static void xlvbd_release_gendisk(struct blkfront_info *info) xlbd_release_minors(minor, nr_minors); blk_cleanup_queue(info->rq); + blk_mq_free_tag_set(&info->tag_set); info->rq = NULL; put_disk(info->gd); info->gd = NULL; } +/* Must be called with io_lock holded */ static void kick_pending_request_queues(struct blkfront_info *info) { - if (!RING_FULL(&info->ring)) { - /* Re-enable calldowns. */ - blk_start_queue(info->rq); - /* Kick things off immediately. */ - do_blkif_request(info->rq); - } + if (!RING_FULL(&info->ring)) + blk_mq_start_stopped_hw_queues(info->rq, true); } static void blkif_restart_queue(struct work_struct *work) @@ -963,7 +959,7 @@ static void blkif_free(struct blkfront_info *info, int suspend) BLKIF_STATE_SUSPENDED : BLKIF_STATE_DISCONNECTED; /* No more blkif_request(). */ if (info->rq) - blk_stop_queue(info->rq); + blk_mq_stop_hw_queues(info->rq); /* Remove all persistent grants */ if (!list_empty(&info->grants)) { @@ -1146,7 +1142,6 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id) RING_IDX i, rp; unsigned long flags; struct blkfront_info *info = (struct blkfront_info *)dev_id; - int error; spin_lock_irqsave(&info->io_lock, flags); @@ -1187,37 +1182,37 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id) continue; } - error = (bret->status == BLKIF_RSP_OKAY) ? 0 : -EIO; + req->errors = (bret->status == BLKIF_RSP_OKAY) ? 0 : -EIO; switch (bret->operation) { case BLKIF_OP_DISCARD: if (unlikely(bret->status == BLKIF_RSP_EOPNOTSUPP)) { struct request_queue *rq = info->rq; printk(KERN_WARNING "blkfront: %s: %s op failed\n", info->gd->disk_name, op_name(bret->operation)); - error = -EOPNOTSUPP; + req->errors = -EOPNOTSUPP; info->feature_discard = 0; info->feature_secdiscard = 0; queue_flag_clear(QUEUE_FLAG_DISCARD, rq); queue_flag_clear(QUEUE_FLAG_SECDISCARD, rq); } - __blk_end_request_all(req, error); + blk_mq_complete_request(req); break; case BLKIF_OP_FLUSH_DISKCACHE: case BLKIF_OP_WRITE_BARRIER: if (unlikely(bret->status == BLKIF_RSP_EOPNOTSUPP)) { printk(KERN_WARNING "blkfront: %s: %s op failed\n", info->gd->disk_name, op_name(bret->operation)); - error = -EOPNOTSUPP; + req->errors = -EOPNOTSUPP; } if (unlikely(bret->status == BLKIF_RSP_ERROR && info->shadow[id].req.u.rw.nr_segments == 0)) { printk(KERN_WARNING "blkfront: %s: empty %s op failed\n", info->gd->disk_name, op_name(bret->operation)); - error = -EOPNOTSUPP; + req->errors = -EOPNOTSUPP; } - if (unlikely(error)) { - if (error == -EOPNOTSUPP) - error = 0; + if (unlikely(req->errors)) { + if (req->errors == -EOPNOTSUPP) + req->errors = 0; info->feature_flush = 0; xlvbd_flush(info); } @@ -1228,7 +1223,7 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id) dev_dbg(&info->xbdev->dev, "Bad return from blkdev data " "request: %x\n", bret->status); - __blk_end_request_all(req, error); + blk_mq_complete_request(req); break; default: BUG(); @@ -1555,28 +1550,6 @@ static int blkif_recover(struct blkfront_info *info) kfree(copy); - /* - * Empty the queue, this is important because we might have - * requests in the queue with more segments than what we - * can handle now. - */ - spin_lock_irq(&info->io_lock); - while ((req = blk_fetch_request(info->rq)) != NULL) { - if (req->cmd_flags & - (REQ_FLUSH | REQ_FUA | REQ_DISCARD | REQ_SECURE)) { - list_add(&req->queuelist, &requests); - continue; - } - merge_bio.head = req->bio; - merge_bio.tail = req->biotail; - bio_list_merge(&bio_list, &merge_bio); - req->bio = NULL; - if (req->cmd_flags & (REQ_FLUSH | REQ_FUA)) - pr_alert("diskcache flush request found!\n"); - __blk_end_request_all(req, 0); - } - spin_unlock_irq(&info->io_lock); - xenbus_switch_state(info->xbdev, XenbusStateConnected); spin_lock_irq(&info->io_lock); @@ -1591,9 +1564,10 @@ static int blkif_recover(struct blkfront_info *info) /* Requeue pending requests (flush or discard) */ list_del_init(&req->queuelist); BUG_ON(req->nr_phys_segments > segs); - blk_requeue_request(info->rq, req); + blk_mq_requeue_request(req); } spin_unlock_irq(&info->io_lock); + blk_mq_kick_requeue_list(info->rq); while ((bio = bio_list_pop(&bio_list)) != NULL) { /* Traverse the list of pending bios and re-queue them */ diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig index 7cd226d..73708ac 100644 --- a/drivers/xen/Kconfig +++ b/drivers/xen/Kconfig @@ -280,4 +280,15 @@ config XEN_ACPI def_bool y depends on X86 && ACPI +config XEN_SYMS + bool "Xen symbols" + depends on X86 && XEN_DOM0 && XENFS + default y if KALLSYMS + help + Exports hypervisor symbols (along with their types and addresses) via + /proc/xen/xensyms file, similar to /proc/kallsyms + +config XEN_HAVE_VPMU + bool + endmenu diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c index bf4a23c..1fa633b 100644 --- a/drivers/xen/balloon.c +++ b/drivers/xen/balloon.c @@ -638,9 +638,9 @@ static int __init balloon_init(void) * regions (see arch/x86/xen/setup.c). */ for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) - if (xen_extra_mem[i].size) - balloon_add_region(PFN_UP(xen_extra_mem[i].start), - PFN_DOWN(xen_extra_mem[i].size)); + if (xen_extra_mem[i].n_pfns) + balloon_add_region(xen_extra_mem[i].start_pfn, + xen_extra_mem[i].n_pfns); return 0; } diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c index ed8bf10..68d1290 100644 --- a/drivers/xen/events/events_base.c +++ b/drivers/xen/events/events_base.c @@ -1301,11 +1301,7 @@ static int rebind_irq_to_cpu(unsigned irq, unsigned tcpu) if (!VALID_EVTCHN(evtchn)) return -1; - /* - * Events delivered via platform PCI interrupts are always - * routed to vcpu 0 and hence cannot be rebound. - */ - if (xen_hvm_domain() && !xen_have_vector_callback) + if (!xen_support_evtchn_rebind()) return -1; /* Send future instances of this interrupt to other vcpu. */ diff --git a/drivers/xen/sys-hypervisor.c b/drivers/xen/sys-hypervisor.c index 96453f8..b5a7342 100644 --- a/drivers/xen/sys-hypervisor.c +++ b/drivers/xen/sys-hypervisor.c @@ -20,6 +20,9 @@ #include <xen/xenbus.h> #include <xen/interface/xen.h> #include <xen/interface/version.h> +#ifdef CONFIG_XEN_HAVE_VPMU +#include <xen/interface/xenpmu.h> +#endif #define HYPERVISOR_ATTR_RO(_name) \ static struct hyp_sysfs_attr _name##_attr = __ATTR_RO(_name) @@ -368,6 +371,126 @@ static void xen_properties_destroy(void) sysfs_remove_group(hypervisor_kobj, &xen_properties_group); } +#ifdef CONFIG_XEN_HAVE_VPMU +struct pmu_mode { + const char *name; + uint32_t mode; +}; + +static struct pmu_mode pmu_modes[] = { + {"off", XENPMU_MODE_OFF}, + {"self", XENPMU_MODE_SELF}, + {"hv", XENPMU_MODE_HV}, + {"all", XENPMU_MODE_ALL} +}; + +static ssize_t pmu_mode_store(struct hyp_sysfs_attr *attr, + const char *buffer, size_t len) +{ + int ret; + struct xen_pmu_params xp; + int i; + + for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) { + if (strncmp(buffer, pmu_modes[i].name, len - 1) == 0) { + xp.val = pmu_modes[i].mode; + break; + } + } + + if (i == ARRAY_SIZE(pmu_modes)) + return -EINVAL; + + xp.version.maj = XENPMU_VER_MAJ; + xp.version.min = XENPMU_VER_MIN; + ret = HYPERVISOR_xenpmu_op(XENPMU_mode_set, &xp); + if (ret) + return ret; + + return len; +} + +static ssize_t pmu_mode_show(struct hyp_sysfs_attr *attr, char *buffer) +{ + int ret; + struct xen_pmu_params xp; + int i; + uint32_t mode; + + xp.version.maj = XENPMU_VER_MAJ; + xp.version.min = XENPMU_VER_MIN; + ret = HYPERVISOR_xenpmu_op(XENPMU_mode_get, &xp); + if (ret) + return ret; + + mode = (uint32_t)xp.val; + for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) { + if (mode == pmu_modes[i].mode) + return sprintf(buffer, "%s\n", pmu_modes[i].name); + } + + return -EINVAL; +} +HYPERVISOR_ATTR_RW(pmu_mode); + +static ssize_t pmu_features_store(struct hyp_sysfs_attr *attr, + const char *buffer, size_t len) +{ + int ret; + uint32_t features; + struct xen_pmu_params xp; + + ret = kstrtou32(buffer, 0, &features); + if (ret) + return ret; + + xp.val = features; + xp.version.maj = XENPMU_VER_MAJ; + xp.version.min = XENPMU_VER_MIN; + ret = HYPERVISOR_xenpmu_op(XENPMU_feature_set, &xp); + if (ret) + return ret; + + return len; +} + +static ssize_t pmu_features_show(struct hyp_sysfs_attr *attr, char *buffer) +{ + int ret; + struct xen_pmu_params xp; + + xp.version.maj = XENPMU_VER_MAJ; + xp.version.min = XENPMU_VER_MIN; + ret = HYPERVISOR_xenpmu_op(XENPMU_feature_get, &xp); + if (ret) + return ret; + + return sprintf(buffer, "0x%x\n", (uint32_t)xp.val); +} +HYPERVISOR_ATTR_RW(pmu_features); + +static struct attribute *xen_pmu_attrs[] = { + &pmu_mode_attr.attr, + &pmu_features_attr.attr, + NULL +}; + +static const struct attribute_group xen_pmu_group = { + .name = "pmu", + .attrs = xen_pmu_attrs, +}; + +static int __init xen_pmu_init(void) +{ + return sysfs_create_group(hypervisor_kobj, &xen_pmu_group); +} + +static void xen_pmu_destroy(void) +{ + sysfs_remove_group(hypervisor_kobj, &xen_pmu_group); +} +#endif + static int __init hyper_sysfs_init(void) { int ret; @@ -390,7 +513,15 @@ static int __init hyper_sysfs_init(void) ret = xen_properties_init(); if (ret) goto prop_out; - +#ifdef CONFIG_XEN_HAVE_VPMU + if (xen_initial_domain()) { + ret = xen_pmu_init(); + if (ret) { + xen_properties_destroy(); + goto prop_out; + } + } +#endif goto out; prop_out: @@ -407,6 +538,9 @@ out: static void __exit hyper_sysfs_exit(void) { +#ifdef CONFIG_XEN_HAVE_VPMU + xen_pmu_destroy(); +#endif xen_properties_destroy(); xen_compilation_destroy(); xen_sysfs_uuid_destroy(); diff --git a/drivers/xen/xenfs/Makefile b/drivers/xen/xenfs/Makefile index b019865..1a83010 100644 --- a/drivers/xen/xenfs/Makefile +++ b/drivers/xen/xenfs/Makefile @@ -2,3 +2,4 @@ obj-$(CONFIG_XENFS) += xenfs.o xenfs-y = super.o xenfs-$(CONFIG_XEN_DOM0) += xenstored.o +xenfs-$(CONFIG_XEN_SYMS) += xensyms.o diff --git a/drivers/xen/xenfs/super.c b/drivers/xen/xenfs/super.c index 06092e0..8559a71 100644 --- a/drivers/xen/xenfs/super.c +++ b/drivers/xen/xenfs/super.c @@ -57,6 +57,9 @@ static int xenfs_fill_super(struct super_block *sb, void *data, int silent) { "privcmd", &xen_privcmd_fops, S_IRUSR|S_IWUSR }, { "xsd_kva", &xsd_kva_file_ops, S_IRUSR|S_IWUSR}, { "xsd_port", &xsd_port_file_ops, S_IRUSR|S_IWUSR}, +#ifdef CONFIG_XEN_SYMS + { "xensyms", &xensyms_ops, S_IRUSR}, +#endif {""}, }; diff --git a/drivers/xen/xenfs/xenfs.h b/drivers/xen/xenfs/xenfs.h index 6b80c77..2c5934e 100644 --- a/drivers/xen/xenfs/xenfs.h +++ b/drivers/xen/xenfs/xenfs.h @@ -3,5 +3,6 @@ extern const struct file_operations xsd_kva_file_ops; extern const struct file_operations xsd_port_file_ops; +extern const struct file_operations xensyms_ops; #endif /* _XENFS_XENBUS_H */ diff --git a/drivers/xen/xenfs/xensyms.c b/drivers/xen/xenfs/xensyms.c new file mode 100644 index 0000000..f8b1285 --- /dev/null +++ b/drivers/xen/xenfs/xensyms.c @@ -0,0 +1,152 @@ +#include <linux/module.h> +#include <linux/init.h> +#include <linux/seq_file.h> +#include <linux/fs.h> +#include <linux/mm.h> +#include <linux/proc_fs.h> +#include <linux/slab.h> +#include <xen/interface/platform.h> +#include <asm/xen/hypercall.h> +#include <xen/xen-ops.h> +#include "xenfs.h" + + +#define XEN_KSYM_NAME_LEN 127 /* Hypervisor may have different name length */ + +struct xensyms { + struct xen_platform_op op; + char *name; + uint32_t namelen; +}; + +/* Grab next output page from the hypervisor */ +static int xensyms_next_sym(struct xensyms *xs) +{ + int ret; + struct xenpf_symdata *symdata = &xs->op.u.symdata; + uint64_t symnum; + + memset(xs->name, 0, xs->namelen); + symdata->namelen = xs->namelen; + + symnum = symdata->symnum; + + ret = HYPERVISOR_dom0_op(&xs->op); + if (ret < 0) + return ret; + + /* + * If hypervisor's symbol didn't fit into the buffer then allocate + * a larger buffer and try again. + */ + if (unlikely(symdata->namelen > xs->namelen)) { + kfree(xs->name); + + xs->namelen = symdata->namelen; + xs->name = kzalloc(xs->namelen, GFP_KERNEL); + if (!xs->name) + return -ENOMEM; + + set_xen_guest_handle(symdata->name, xs->name); + symdata->symnum--; /* Rewind */ + + ret = HYPERVISOR_dom0_op(&xs->op); + if (ret < 0) + return ret; + } + + if (symdata->symnum == symnum) + /* End of symbols */ + return 1; + + return 0; +} + +static void *xensyms_start(struct seq_file *m, loff_t *pos) +{ + struct xensyms *xs = (struct xensyms *)m->private; + + xs->op.u.symdata.symnum = *pos; + + if (xensyms_next_sym(xs)) + return NULL; + + return m->private; +} + +static void *xensyms_next(struct seq_file *m, void *p, loff_t *pos) +{ + struct xensyms *xs = (struct xensyms *)m->private; + + xs->op.u.symdata.symnum = ++(*pos); + + if (xensyms_next_sym(xs)) + return NULL; + + return p; +} + +static int xensyms_show(struct seq_file *m, void *p) +{ + struct xensyms *xs = (struct xensyms *)m->private; + struct xenpf_symdata *symdata = &xs->op.u.symdata; + + seq_printf(m, "%016llx %c %s\n", symdata->address, + symdata->type, xs->name); + + return 0; +} + +static void xensyms_stop(struct seq_file *m, void *p) +{ +} + +static const struct seq_operations xensyms_seq_ops = { + .start = xensyms_start, + .next = xensyms_next, + .show = xensyms_show, + .stop = xensyms_stop, +}; + +static int xensyms_open(struct inode *inode, struct file *file) +{ + struct seq_file *m; + struct xensyms *xs; + int ret; + + ret = seq_open_private(file, &xensyms_seq_ops, + sizeof(struct xensyms)); + if (ret) + return ret; + + m = file->private_data; + xs = (struct xensyms *)m->private; + + xs->namelen = XEN_KSYM_NAME_LEN + 1; + xs->name = kzalloc(xs->namelen, GFP_KERNEL); + if (!xs->name) { + seq_release_private(inode, file); + return -ENOMEM; + } + set_xen_guest_handle(xs->op.u.symdata.name, xs->name); + xs->op.cmd = XENPF_get_symbol; + xs->op.u.symdata.namelen = xs->namelen; + + return 0; +} + +static int xensyms_release(struct inode *inode, struct file *file) +{ + struct seq_file *m = file->private_data; + struct xensyms *xs = (struct xensyms *)m->private; + + kfree(xs->name); + return seq_release_private(inode, file); +} + +const struct file_operations xensyms_ops = { + .open = xensyms_open, + .read = seq_read, + .llseek = seq_lseek, + .release = xensyms_release +}; |