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@@ -0,0 +1,262 @@
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+/*
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License, version 2, as
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+ * published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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+ *
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+ * Copyright IBM Corp. 2007
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+ *
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+ * Authors: Hollis Blanchard <hollisb@us.ibm.com>
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+ * Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
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+ */
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+
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+#include <linux/kvm_host.h>
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+#include <linux/fs.h>
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+#include <linux/seq_file.h>
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+#include <linux/debugfs.h>
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+#include <linux/uaccess.h>
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+
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+#include "timing.h"
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+#include <asm/time.h>
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+#include <asm-generic/div64.h>
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+
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+void kvmppc_init_timing_stats(struct kvm_vcpu *vcpu)
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+{
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+ int i;
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+
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+ /* pause guest execution to avoid concurrent updates */
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+ local_irq_disable();
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+ mutex_lock(&vcpu->mutex);
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+
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+ vcpu->arch.last_exit_type = 0xDEAD;
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+ for (i = 0; i < __NUMBER_OF_KVM_EXIT_TYPES; i++) {
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+ vcpu->arch.timing_count_type[i] = 0;
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+ vcpu->arch.timing_max_duration[i] = 0;
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+ vcpu->arch.timing_min_duration[i] = 0xFFFFFFFF;
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+ vcpu->arch.timing_sum_duration[i] = 0;
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+ vcpu->arch.timing_sum_quad_duration[i] = 0;
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+ }
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+ vcpu->arch.timing_last_exit = 0;
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+ vcpu->arch.timing_exit.tv64 = 0;
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+ vcpu->arch.timing_last_enter.tv64 = 0;
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+
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+ mutex_unlock(&vcpu->mutex);
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+ local_irq_enable();
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+}
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+
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+static void add_exit_timing(struct kvm_vcpu *vcpu,
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+ u64 duration, int type)
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+{
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+ u64 old;
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+
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+ do_div(duration, tb_ticks_per_usec);
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+ if (unlikely(duration > 0xFFFFFFFF)) {
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+ printk(KERN_ERR"%s - duration too big -> overflow"
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+ " duration %lld type %d exit #%d\n",
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+ __func__, duration, type,
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+ vcpu->arch.timing_count_type[type]);
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+ return;
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+ }
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+
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+ vcpu->arch.timing_count_type[type]++;
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+
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+ /* sum */
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+ old = vcpu->arch.timing_sum_duration[type];
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+ vcpu->arch.timing_sum_duration[type] += duration;
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+ if (unlikely(old > vcpu->arch.timing_sum_duration[type])) {
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+ printk(KERN_ERR"%s - wrap adding sum of durations"
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+ " old %lld new %lld type %d exit # of type %d\n",
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+ __func__, old, vcpu->arch.timing_sum_duration[type],
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+ type, vcpu->arch.timing_count_type[type]);
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+ }
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+
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+ /* square sum */
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+ old = vcpu->arch.timing_sum_quad_duration[type];
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+ vcpu->arch.timing_sum_quad_duration[type] += (duration*duration);
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+ if (unlikely(old > vcpu->arch.timing_sum_quad_duration[type])) {
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+ printk(KERN_ERR"%s - wrap adding sum of squared durations"
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+ " old %lld new %lld type %d exit # of type %d\n",
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+ __func__, old,
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+ vcpu->arch.timing_sum_quad_duration[type],
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+ type, vcpu->arch.timing_count_type[type]);
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+ }
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+
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+ /* set min/max */
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+ if (unlikely(duration < vcpu->arch.timing_min_duration[type]))
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+ vcpu->arch.timing_min_duration[type] = duration;
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+ if (unlikely(duration > vcpu->arch.timing_max_duration[type]))
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+ vcpu->arch.timing_max_duration[type] = duration;
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+}
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+
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+void kvmppc_update_timing_stats(struct kvm_vcpu *vcpu)
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+{
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+ u64 exit = vcpu->arch.timing_last_exit;
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+ u64 enter = vcpu->arch.timing_last_enter.tv64;
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+
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+ /* save exit time, used next exit when the reenter time is known */
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+ vcpu->arch.timing_last_exit = vcpu->arch.timing_exit.tv64;
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+
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+ if (unlikely(vcpu->arch.last_exit_type == 0xDEAD || exit == 0))
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+ return; /* skip incomplete cycle (e.g. after reset) */
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+
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+ /* update statistics for average and standard deviation */
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+ add_exit_timing(vcpu, (enter - exit), vcpu->arch.last_exit_type);
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+ /* enter -> timing_last_exit is time spent in guest - log this too */
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+ add_exit_timing(vcpu, (vcpu->arch.timing_last_exit - enter),
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+ TIMEINGUEST);
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+}
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+
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+static const char *kvm_exit_names[__NUMBER_OF_KVM_EXIT_TYPES] = {
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+ [MMIO_EXITS] = "MMIO",
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+ [DCR_EXITS] = "DCR",
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+ [SIGNAL_EXITS] = "SIGNAL",
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+ [ITLB_REAL_MISS_EXITS] = "ITLBREAL",
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+ [ITLB_VIRT_MISS_EXITS] = "ITLBVIRT",
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+ [DTLB_REAL_MISS_EXITS] = "DTLBREAL",
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+ [DTLB_VIRT_MISS_EXITS] = "DTLBVIRT",
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+ [SYSCALL_EXITS] = "SYSCALL",
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+ [ISI_EXITS] = "ISI",
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+ [DSI_EXITS] = "DSI",
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+ [EMULATED_INST_EXITS] = "EMULINST",
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+ [EMULATED_MTMSRWE_EXITS] = "EMUL_WAIT",
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+ [EMULATED_WRTEE_EXITS] = "EMUL_WRTEE",
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+ [EMULATED_MTSPR_EXITS] = "EMUL_MTSPR",
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+ [EMULATED_MFSPR_EXITS] = "EMUL_MFSPR",
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+ [EMULATED_MTMSR_EXITS] = "EMUL_MTMSR",
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+ [EMULATED_MFMSR_EXITS] = "EMUL_MFMSR",
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+ [EMULATED_TLBSX_EXITS] = "EMUL_TLBSX",
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+ [EMULATED_TLBWE_EXITS] = "EMUL_TLBWE",
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+ [EMULATED_RFI_EXITS] = "EMUL_RFI",
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+ [DEC_EXITS] = "DEC",
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+ [EXT_INTR_EXITS] = "EXTINT",
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+ [HALT_WAKEUP] = "HALT",
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+ [USR_PR_INST] = "USR_PR_INST",
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+ [FP_UNAVAIL] = "FP_UNAVAIL",
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+ [DEBUG_EXITS] = "DEBUG",
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+ [TIMEINGUEST] = "TIMEINGUEST"
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+};
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+
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+static int kvmppc_exit_timing_show(struct seq_file *m, void *private)
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+{
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+ struct kvm_vcpu *vcpu = m->private;
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+ int i;
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+ u64 min, max;
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+
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+ for (i = 0; i < __NUMBER_OF_KVM_EXIT_TYPES; i++) {
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+ if (vcpu->arch.timing_min_duration[i] == 0xFFFFFFFF)
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+ min = 0;
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+ else
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+ min = vcpu->arch.timing_min_duration[i];
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+ if (vcpu->arch.timing_max_duration[i] == 0)
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+ max = 0;
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+ else
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+ max = vcpu->arch.timing_max_duration[i];
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+
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+ seq_printf(m, "%12s: count %10d min %10lld "
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+ "max %10lld sum %20lld sum_quad %20lld\n",
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+ kvm_exit_names[i], vcpu->arch.timing_count_type[i],
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+ vcpu->arch.timing_min_duration[i],
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+ vcpu->arch.timing_max_duration[i],
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+ vcpu->arch.timing_sum_duration[i],
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+ vcpu->arch.timing_sum_quad_duration[i]);
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+ }
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+ return 0;
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+}
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+
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+static ssize_t kvmppc_exit_timing_write(struct file *file,
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+ const char __user *user_buf,
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+ size_t count, loff_t *ppos)
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+{
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+ size_t len;
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+ int err;
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+ const char __user *p;
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+ char c;
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+
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+ len = 0;
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+ p = user_buf;
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+ while (len < count) {
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+ if (get_user(c, p++))
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+ err = -EFAULT;
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+ if (c == 0 || c == '\n')
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+ break;
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+ len++;
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+ }
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+
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+ if (len > 1) {
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+ err = -EINVAL;
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+ goto done;
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+ }
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+
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+ if (copy_from_user(&c, user_buf, sizeof(c))) {
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+ err = -EFAULT;
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+ goto done;
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+ }
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+
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+ if (c == 'c') {
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+ struct seq_file *seqf = (struct seq_file *)file->private_data;
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+ struct kvm_vcpu *vcpu = seqf->private;
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+ /* write does not affect out buffers previsously generated with
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+ * show. Seq file is locked here to prevent races of init with
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+ * a show call */
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+ mutex_lock(&seqf->lock);
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+ kvmppc_init_timing_stats(vcpu);
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+ mutex_unlock(&seqf->lock);
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+ err = count;
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+ } else {
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+ err = -EINVAL;
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+ goto done;
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+ }
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+
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+done:
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+ return err;
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+}
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+
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+static int kvmppc_exit_timing_open(struct inode *inode, struct file *file)
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+{
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+ return single_open(file, kvmppc_exit_timing_show, inode->i_private);
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+}
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+
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+static struct file_operations kvmppc_exit_timing_fops = {
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+ .owner = THIS_MODULE,
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+ .open = kvmppc_exit_timing_open,
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+ .read = seq_read,
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+ .write = kvmppc_exit_timing_write,
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+ .llseek = seq_lseek,
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+ .release = single_release,
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+};
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+
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+void kvmppc_create_vcpu_debugfs(struct kvm_vcpu *vcpu, unsigned int id)
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+{
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+ static char dbg_fname[50];
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+ struct dentry *debugfs_file;
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+
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+ snprintf(dbg_fname, sizeof(dbg_fname), "vm%u_vcpu%03u_timing",
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+ current->pid, id);
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+ debugfs_file = debugfs_create_file(dbg_fname, 0666,
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+ kvm_debugfs_dir, vcpu,
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+ &kvmppc_exit_timing_fops);
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+
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+ if (!debugfs_file) {
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+ printk(KERN_ERR"%s: error creating debugfs file %s\n",
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+ __func__, dbg_fname);
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+ return;
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+ }
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+
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+ vcpu->arch.debugfs_exit_timing = debugfs_file;
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+}
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+
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+void kvmppc_remove_vcpu_debugfs(struct kvm_vcpu *vcpu)
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+{
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+ if (vcpu->arch.debugfs_exit_timing) {
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+ debugfs_remove(vcpu->arch.debugfs_exit_timing);
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+ vcpu->arch.debugfs_exit_timing = NULL;
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+ }
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+}
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Hollis Blanchard