828c09509b
[akpm@linux-foundation.org: fix KVM] Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Acked-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
240 lines
7.1 KiB
C
240 lines
7.1 KiB
C
/*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License, version 2, as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*
|
|
* Copyright IBM Corp. 2008
|
|
*
|
|
* Authors: Hollis Blanchard <hollisb@us.ibm.com>
|
|
* Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
|
|
*/
|
|
|
|
#include <linux/kvm_host.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/debugfs.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
#include <asm/time.h>
|
|
#include <asm-generic/div64.h>
|
|
|
|
#include "timing.h"
|
|
|
|
void kvmppc_init_timing_stats(struct kvm_vcpu *vcpu)
|
|
{
|
|
int i;
|
|
|
|
/* pause guest execution to avoid concurrent updates */
|
|
local_irq_disable();
|
|
mutex_lock(&vcpu->mutex);
|
|
|
|
vcpu->arch.last_exit_type = 0xDEAD;
|
|
for (i = 0; i < __NUMBER_OF_KVM_EXIT_TYPES; i++) {
|
|
vcpu->arch.timing_count_type[i] = 0;
|
|
vcpu->arch.timing_max_duration[i] = 0;
|
|
vcpu->arch.timing_min_duration[i] = 0xFFFFFFFF;
|
|
vcpu->arch.timing_sum_duration[i] = 0;
|
|
vcpu->arch.timing_sum_quad_duration[i] = 0;
|
|
}
|
|
vcpu->arch.timing_last_exit = 0;
|
|
vcpu->arch.timing_exit.tv64 = 0;
|
|
vcpu->arch.timing_last_enter.tv64 = 0;
|
|
|
|
mutex_unlock(&vcpu->mutex);
|
|
local_irq_enable();
|
|
}
|
|
|
|
static void add_exit_timing(struct kvm_vcpu *vcpu, u64 duration, int type)
|
|
{
|
|
u64 old;
|
|
|
|
do_div(duration, tb_ticks_per_usec);
|
|
if (unlikely(duration > 0xFFFFFFFF)) {
|
|
printk(KERN_ERR"%s - duration too big -> overflow"
|
|
" duration %lld type %d exit #%d\n",
|
|
__func__, duration, type,
|
|
vcpu->arch.timing_count_type[type]);
|
|
return;
|
|
}
|
|
|
|
vcpu->arch.timing_count_type[type]++;
|
|
|
|
/* sum */
|
|
old = vcpu->arch.timing_sum_duration[type];
|
|
vcpu->arch.timing_sum_duration[type] += duration;
|
|
if (unlikely(old > vcpu->arch.timing_sum_duration[type])) {
|
|
printk(KERN_ERR"%s - wrap adding sum of durations"
|
|
" old %lld new %lld type %d exit # of type %d\n",
|
|
__func__, old, vcpu->arch.timing_sum_duration[type],
|
|
type, vcpu->arch.timing_count_type[type]);
|
|
}
|
|
|
|
/* square sum */
|
|
old = vcpu->arch.timing_sum_quad_duration[type];
|
|
vcpu->arch.timing_sum_quad_duration[type] += (duration*duration);
|
|
if (unlikely(old > vcpu->arch.timing_sum_quad_duration[type])) {
|
|
printk(KERN_ERR"%s - wrap adding sum of squared durations"
|
|
" old %lld new %lld type %d exit # of type %d\n",
|
|
__func__, old,
|
|
vcpu->arch.timing_sum_quad_duration[type],
|
|
type, vcpu->arch.timing_count_type[type]);
|
|
}
|
|
|
|
/* set min/max */
|
|
if (unlikely(duration < vcpu->arch.timing_min_duration[type]))
|
|
vcpu->arch.timing_min_duration[type] = duration;
|
|
if (unlikely(duration > vcpu->arch.timing_max_duration[type]))
|
|
vcpu->arch.timing_max_duration[type] = duration;
|
|
}
|
|
|
|
void kvmppc_update_timing_stats(struct kvm_vcpu *vcpu)
|
|
{
|
|
u64 exit = vcpu->arch.timing_last_exit;
|
|
u64 enter = vcpu->arch.timing_last_enter.tv64;
|
|
|
|
/* save exit time, used next exit when the reenter time is known */
|
|
vcpu->arch.timing_last_exit = vcpu->arch.timing_exit.tv64;
|
|
|
|
if (unlikely(vcpu->arch.last_exit_type == 0xDEAD || exit == 0))
|
|
return; /* skip incomplete cycle (e.g. after reset) */
|
|
|
|
/* update statistics for average and standard deviation */
|
|
add_exit_timing(vcpu, (enter - exit), vcpu->arch.last_exit_type);
|
|
/* enter -> timing_last_exit is time spent in guest - log this too */
|
|
add_exit_timing(vcpu, (vcpu->arch.timing_last_exit - enter),
|
|
TIMEINGUEST);
|
|
}
|
|
|
|
static const char *kvm_exit_names[__NUMBER_OF_KVM_EXIT_TYPES] = {
|
|
[MMIO_EXITS] = "MMIO",
|
|
[DCR_EXITS] = "DCR",
|
|
[SIGNAL_EXITS] = "SIGNAL",
|
|
[ITLB_REAL_MISS_EXITS] = "ITLBREAL",
|
|
[ITLB_VIRT_MISS_EXITS] = "ITLBVIRT",
|
|
[DTLB_REAL_MISS_EXITS] = "DTLBREAL",
|
|
[DTLB_VIRT_MISS_EXITS] = "DTLBVIRT",
|
|
[SYSCALL_EXITS] = "SYSCALL",
|
|
[ISI_EXITS] = "ISI",
|
|
[DSI_EXITS] = "DSI",
|
|
[EMULATED_INST_EXITS] = "EMULINST",
|
|
[EMULATED_MTMSRWE_EXITS] = "EMUL_WAIT",
|
|
[EMULATED_WRTEE_EXITS] = "EMUL_WRTEE",
|
|
[EMULATED_MTSPR_EXITS] = "EMUL_MTSPR",
|
|
[EMULATED_MFSPR_EXITS] = "EMUL_MFSPR",
|
|
[EMULATED_MTMSR_EXITS] = "EMUL_MTMSR",
|
|
[EMULATED_MFMSR_EXITS] = "EMUL_MFMSR",
|
|
[EMULATED_TLBSX_EXITS] = "EMUL_TLBSX",
|
|
[EMULATED_TLBWE_EXITS] = "EMUL_TLBWE",
|
|
[EMULATED_RFI_EXITS] = "EMUL_RFI",
|
|
[DEC_EXITS] = "DEC",
|
|
[EXT_INTR_EXITS] = "EXTINT",
|
|
[HALT_WAKEUP] = "HALT",
|
|
[USR_PR_INST] = "USR_PR_INST",
|
|
[FP_UNAVAIL] = "FP_UNAVAIL",
|
|
[DEBUG_EXITS] = "DEBUG",
|
|
[TIMEINGUEST] = "TIMEINGUEST"
|
|
};
|
|
|
|
static int kvmppc_exit_timing_show(struct seq_file *m, void *private)
|
|
{
|
|
struct kvm_vcpu *vcpu = m->private;
|
|
int i;
|
|
|
|
seq_printf(m, "%s", "type count min max sum sum_squared\n");
|
|
|
|
for (i = 0; i < __NUMBER_OF_KVM_EXIT_TYPES; i++) {
|
|
seq_printf(m, "%12s %10d %10lld %10lld %20lld %20lld\n",
|
|
kvm_exit_names[i],
|
|
vcpu->arch.timing_count_type[i],
|
|
vcpu->arch.timing_min_duration[i],
|
|
vcpu->arch.timing_max_duration[i],
|
|
vcpu->arch.timing_sum_duration[i],
|
|
vcpu->arch.timing_sum_quad_duration[i]);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Write 'c' to clear the timing statistics. */
|
|
static ssize_t kvmppc_exit_timing_write(struct file *file,
|
|
const char __user *user_buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
int err = -EINVAL;
|
|
char c;
|
|
|
|
if (count > 1) {
|
|
goto done;
|
|
}
|
|
|
|
if (get_user(c, user_buf)) {
|
|
err = -EFAULT;
|
|
goto done;
|
|
}
|
|
|
|
if (c == 'c') {
|
|
struct seq_file *seqf = (struct seq_file *)file->private_data;
|
|
struct kvm_vcpu *vcpu = seqf->private;
|
|
/* Write does not affect our buffers previously generated with
|
|
* show. seq_file is locked here to prevent races of init with
|
|
* a show call */
|
|
mutex_lock(&seqf->lock);
|
|
kvmppc_init_timing_stats(vcpu);
|
|
mutex_unlock(&seqf->lock);
|
|
err = count;
|
|
}
|
|
|
|
done:
|
|
return err;
|
|
}
|
|
|
|
static int kvmppc_exit_timing_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, kvmppc_exit_timing_show, inode->i_private);
|
|
}
|
|
|
|
static const struct file_operations kvmppc_exit_timing_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = kvmppc_exit_timing_open,
|
|
.read = seq_read,
|
|
.write = kvmppc_exit_timing_write,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
void kvmppc_create_vcpu_debugfs(struct kvm_vcpu *vcpu, unsigned int id)
|
|
{
|
|
static char dbg_fname[50];
|
|
struct dentry *debugfs_file;
|
|
|
|
snprintf(dbg_fname, sizeof(dbg_fname), "vm%u_vcpu%u_timing",
|
|
current->pid, id);
|
|
debugfs_file = debugfs_create_file(dbg_fname, 0666,
|
|
kvm_debugfs_dir, vcpu,
|
|
&kvmppc_exit_timing_fops);
|
|
|
|
if (!debugfs_file) {
|
|
printk(KERN_ERR"%s: error creating debugfs file %s\n",
|
|
__func__, dbg_fname);
|
|
return;
|
|
}
|
|
|
|
vcpu->arch.debugfs_exit_timing = debugfs_file;
|
|
}
|
|
|
|
void kvmppc_remove_vcpu_debugfs(struct kvm_vcpu *vcpu)
|
|
{
|
|
if (vcpu->arch.debugfs_exit_timing) {
|
|
debugfs_remove(vcpu->arch.debugfs_exit_timing);
|
|
vcpu->arch.debugfs_exit_timing = NULL;
|
|
}
|
|
}
|