#include #include #include #include #include #include #include #include #include #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_platform_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_platform_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 }; b42828785b589f686725ff5bc3b9b25'>interface/io/protocols.h
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authorThomas Gleixner <tglx@linutronix.de>2017-01-31 09:37:34 +0100
committerThomas Gleixner <tglx@linutronix.de>2017-01-31 21:47:58 +0100
commit0becc0ae5b42828785b589f686725ff5bc3b9b25 (patch)
treebe6d0e1f37c38ed0a7dd5da2d4b1e93f0fb43101 /include/xen/interface/io/protocols.h
parent24c2503255d35c269b67162c397a1a1c1e02f6ce (diff)
x86/mce: Make timer handling more robust
Erik reported that on a preproduction hardware a CMCI storm triggers the BUG_ON in add_timer_on(). The reason is that the per CPU MCE timer is started by the CMCI logic before the MCE CPU hotplug callback starts the timer with add_timer_on(). So the timer is already queued which triggers the BUG. Using add_timer_on() is pretty pointless in this code because the timer is strictlty per CPU, initialized as pinned and all operations which arm the timer happen on the CPU to which the timer belongs. Simplify the whole machinery by using mod_timer() instead of add_timer_on() which avoids the problem because mod_timer() can handle already queued timers. Use __start_timer() everywhere so the earliest armed expiry time is preserved. Reported-by: Erik Veijola <erik.veijola@intel.com> Tested-by: Borislav Petkov <bp@alien8.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Borislav Petkov <bp@alien8.de> Cc: Tony Luck <tony.luck@intel.com> Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1701310936080.3457@nanos Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/xen/interface/io/protocols.h')