Skip to main content

Browse the archive

Revision 95ef1e52922cf75b1ea2eae54ef886f2cc47eecb authored by Avi Kivity on 15 November 2011, 12:59:07 UTC, committed by Avi Kivity on 20 November 2011, 08:53:48 UTC 
KVM guest: prevent tracing recursion with kvmclock
 
Prevent tracing of preempt_disable() in get_cpu_var() in
kvm_clock_read(). When CONFIG_DEBUG_PREEMPT is enabled,
preempt_disable/enable() are traced and this causes the function_graph
tracer to go into an infinite recursion. By open coding the
preempt_disable() around the get_cpu_var(), we can use the notrace
version which prevents preempt_disable/enable() from being traced and
prevents the recursion.

Based on a similar patch for Xen from Jeremy Fitzhardinge.

Tested-by: Gleb Natapov <gleb@redhat.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Avi Kivity <avi@redhat.com>
1 parent bb75c62
Raw File
osd_sec.h 
/*
 * osd_sec.h - OSD security manager API
 *
 * Copyright (C) 2008 Panasas Inc.  All rights reserved.
 *
 * Authors:
 *   Boaz Harrosh <bharrosh@panasas.com>
 *   Benny Halevy <bhalevy@panasas.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 *
 */
#ifndef __OSD_SEC_H__
#define __OSD_SEC_H__

#include "osd_protocol.h"
#include "osd_types.h"

/*
 * Contains types and constants of osd capabilities and security
 * encoding/decoding.
 * API is trying to keep security abstract so initiator of an object
 * based pNFS client knows as little as possible about security and
 * capabilities. It is the Server's osd-initiator place to know more.
 * Also can be used by osd-target.
 */
void osd_sec_encode_caps(void *caps, ...);/* NI */
void osd_sec_init_nosec_doall_caps(void *caps,
	const struct osd_obj_id *obj, bool is_collection, const bool is_v1);

bool osd_is_sec_alldata(struct osd_security_parameters *sec_params);

/* Conditionally sign the CDB according to security setting in ocdb
 * with cap_key */
void osd_sec_sign_cdb(struct osd_cdb *ocdb, const u8 *cap_key);

/* Unconditionally sign the BIO data with cap_key.
 * Check for osd_is_sec_alldata() was done prior to calling this. */
void osd_sec_sign_data(void *data_integ, struct bio *bio, const u8 *cap_key);

/* Version independent copy of caps into the cdb */
void osd_set_caps(struct osd_cdb *cdb, const void *caps);

#endif /* ndef __OSD_SEC_H__ */
back to top