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KVM: ppc: mostly cosmetic updates to the exit timing accounting code

Browse source 
The only significant changes were to kvmppc_exit_timing_write() and
kvmppc_exit_timing_show(), both of which were dramatically simplified.

Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Hollis Blanchard 2008-12-02 15:51:58 -06:00 committed by Avi Kivity
parent 73e75b416f
commit 7b7015914b
5 changed files with 66 additions and 91 deletions
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8
arch/powerpc/include/asm/kvm_host.h
View file

@ -102,9 +102,8 @@ enum kvm_exit_types {
__NUMBER_OF_KVM_EXIT_TYPES __NUMBER_OF_KVM_EXIT_TYPES
}; };
#ifdef CONFIG_KVM_EXIT_TIMING
/* allow access to big endian 32bit upper/lower parts and 64bit var */ /* allow access to big endian 32bit upper/lower parts and 64bit var */
struct exit_timing { struct kvmppc_exit_timing {
union { union {
u64 tv64; u64 tv64;
struct { struct {
@ -112,7 +111,6 @@ struct exit_timing {
} tv32; } tv32;
}; };
}; };
#endif
struct kvm_arch { struct kvm_arch {
}; };
@ -174,8 +172,8 @@ struct kvm_vcpu_arch {
u32 dbcr1; u32 dbcr1;
#ifdef CONFIG_KVM_EXIT_TIMING #ifdef CONFIG_KVM_EXIT_TIMING
struct exit_timing timing_exit; struct kvmppc_exit_timing timing_exit;
struct exit_timing timing_last_enter; struct kvmppc_exit_timing timing_last_enter;
u32 last_exit_type; u32 last_exit_type;
u32 timing_count_type[__NUMBER_OF_KVM_EXIT_TYPES]; u32 timing_count_type[__NUMBER_OF_KVM_EXIT_TYPES];
u64 timing_sum_duration[__NUMBER_OF_KVM_EXIT_TYPES]; u64 timing_sum_duration[__NUMBER_OF_KVM_EXIT_TYPES];

4
arch/powerpc/kvm/44x_emulate.c
View file

@ -132,7 +132,7 @@ int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
run->dcr.is_write = 0; run->dcr.is_write = 0;
vcpu->arch.io_gpr = rt; vcpu->arch.io_gpr = rt;
vcpu->arch.dcr_needed = 1; vcpu->arch.dcr_needed = 1;
account_exit(vcpu, DCR_EXITS); kvmppc_account_exit(vcpu, DCR_EXITS);
emulated = EMULATE_DO_DCR; emulated = EMULATE_DO_DCR;
} }
@ -152,7 +152,7 @@ int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
run->dcr.data = vcpu->arch.gpr[rs]; run->dcr.data = vcpu->arch.gpr[rs];
run->dcr.is_write = 1; run->dcr.is_write = 1;
vcpu->arch.dcr_needed = 1; vcpu->arch.dcr_needed = 1;
account_exit(vcpu, DCR_EXITS); kvmppc_account_exit(vcpu, DCR_EXITS);
emulated = EMULATE_DO_DCR; emulated = EMULATE_DO_DCR;
} }

30
arch/powerpc/kvm/booke.c
View file

@ -202,7 +202,7 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
break; break;
case BOOKE_INTERRUPT_EXTERNAL: case BOOKE_INTERRUPT_EXTERNAL:
account_exit(vcpu, EXT_INTR_EXITS); kvmppc_account_exit(vcpu, EXT_INTR_EXITS);
if (need_resched()) if (need_resched())
cond_resched(); cond_resched();
r = RESUME_GUEST; r = RESUME_GUEST;
@ -212,7 +212,7 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
/* Since we switched IVPR back to the host's value, the host /* Since we switched IVPR back to the host's value, the host
* handled this interrupt the moment we enabled interrupts. * handled this interrupt the moment we enabled interrupts.
* Now we just offer it a chance to reschedule the guest. */ * Now we just offer it a chance to reschedule the guest. */
account_exit(vcpu, DEC_EXITS); kvmppc_account_exit(vcpu, DEC_EXITS);
if (need_resched()) if (need_resched())
cond_resched(); cond_resched();
r = RESUME_GUEST; r = RESUME_GUEST;
@ -225,7 +225,7 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
vcpu->arch.esr = vcpu->arch.fault_esr; vcpu->arch.esr = vcpu->arch.fault_esr;
kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_PROGRAM); kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_PROGRAM);
r = RESUME_GUEST; r = RESUME_GUEST;
account_exit(vcpu, USR_PR_INST); kvmppc_account_exit(vcpu, USR_PR_INST);
break; break;
} }
@ -233,7 +233,7 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
switch (er) { switch (er) {
case EMULATE_DONE: case EMULATE_DONE:
/* don't overwrite subtypes, just account kvm_stats */ /* don't overwrite subtypes, just account kvm_stats */
account_exit_stat(vcpu, EMULATED_INST_EXITS); kvmppc_account_exit_stat(vcpu, EMULATED_INST_EXITS);
/* Future optimization: only reload non-volatiles if /* Future optimization: only reload non-volatiles if
* they were actually modified by emulation. */ * they were actually modified by emulation. */
r = RESUME_GUEST_NV; r = RESUME_GUEST_NV;
@ -259,7 +259,7 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
case BOOKE_INTERRUPT_FP_UNAVAIL: case BOOKE_INTERRUPT_FP_UNAVAIL:
kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_FP_UNAVAIL); kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_FP_UNAVAIL);
account_exit(vcpu, FP_UNAVAIL); kvmppc_account_exit(vcpu, FP_UNAVAIL);
r = RESUME_GUEST; r = RESUME_GUEST;
break; break;
@ -267,20 +267,20 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
vcpu->arch.dear = vcpu->arch.fault_dear; vcpu->arch.dear = vcpu->arch.fault_dear;
vcpu->arch.esr = vcpu->arch.fault_esr; vcpu->arch.esr = vcpu->arch.fault_esr;
kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DATA_STORAGE); kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DATA_STORAGE);
account_exit(vcpu, DSI_EXITS); kvmppc_account_exit(vcpu, DSI_EXITS);
r = RESUME_GUEST; r = RESUME_GUEST;
break; break;
case BOOKE_INTERRUPT_INST_STORAGE: case BOOKE_INTERRUPT_INST_STORAGE:
vcpu->arch.esr = vcpu->arch.fault_esr; vcpu->arch.esr = vcpu->arch.fault_esr;
kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_INST_STORAGE); kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_INST_STORAGE);
account_exit(vcpu, ISI_EXITS); kvmppc_account_exit(vcpu, ISI_EXITS);
r = RESUME_GUEST; r = RESUME_GUEST;
break; break;
case BOOKE_INTERRUPT_SYSCALL: case BOOKE_INTERRUPT_SYSCALL:
kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_SYSCALL); kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_SYSCALL);
account_exit(vcpu, SYSCALL_EXITS); kvmppc_account_exit(vcpu, SYSCALL_EXITS);
r = RESUME_GUEST; r = RESUME_GUEST;
break; break;
@ -299,7 +299,7 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DTLB_MISS); kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DTLB_MISS);
vcpu->arch.dear = vcpu->arch.fault_dear; vcpu->arch.dear = vcpu->arch.fault_dear;
vcpu->arch.esr = vcpu->arch.fault_esr; vcpu->arch.esr = vcpu->arch.fault_esr;
account_exit(vcpu, DTLB_REAL_MISS_EXITS); kvmppc_account_exit(vcpu, DTLB_REAL_MISS_EXITS);
r = RESUME_GUEST; r = RESUME_GUEST;
break; break;
} }
@ -317,13 +317,13 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
* invoking the guest. */ * invoking the guest. */
kvmppc_mmu_map(vcpu, eaddr, vcpu->arch.paddr_accessed, gtlbe->tid, kvmppc_mmu_map(vcpu, eaddr, vcpu->arch.paddr_accessed, gtlbe->tid,
gtlbe->word2, get_tlb_bytes(gtlbe), gtlb_index); gtlbe->word2, get_tlb_bytes(gtlbe), gtlb_index);
account_exit(vcpu, DTLB_VIRT_MISS_EXITS); kvmppc_account_exit(vcpu, DTLB_VIRT_MISS_EXITS);
r = RESUME_GUEST; r = RESUME_GUEST;
} else { } else {
/* Guest has mapped and accessed a page which is not /* Guest has mapped and accessed a page which is not
* actually RAM. */ * actually RAM. */
r = kvmppc_emulate_mmio(run, vcpu); r = kvmppc_emulate_mmio(run, vcpu);
account_exit(vcpu, MMIO_EXITS); kvmppc_account_exit(vcpu, MMIO_EXITS);
} }
break; break;
@ -345,11 +345,11 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
if (gtlb_index < 0) { if (gtlb_index < 0) {
/* The guest didn't have a mapping for it. */ /* The guest didn't have a mapping for it. */
kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_ITLB_MISS); kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_ITLB_MISS);
account_exit(vcpu, ITLB_REAL_MISS_EXITS); kvmppc_account_exit(vcpu, ITLB_REAL_MISS_EXITS);
break; break;
} }
account_exit(vcpu, ITLB_VIRT_MISS_EXITS); kvmppc_account_exit(vcpu, ITLB_VIRT_MISS_EXITS);
gtlbe = &vcpu_44x->guest_tlb[gtlb_index]; gtlbe = &vcpu_44x->guest_tlb[gtlb_index];
gpaddr = tlb_xlate(gtlbe, eaddr); gpaddr = tlb_xlate(gtlbe, eaddr);
@ -383,7 +383,7 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
mtspr(SPRN_DBSR, dbsr); mtspr(SPRN_DBSR, dbsr);
run->exit_reason = KVM_EXIT_DEBUG; run->exit_reason = KVM_EXIT_DEBUG;
account_exit(vcpu, DEBUG_EXITS); kvmppc_account_exit(vcpu, DEBUG_EXITS);
r = RESUME_HOST; r = RESUME_HOST;
break; break;
} }
@ -404,7 +404,7 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
if (signal_pending(current)) { if (signal_pending(current)) {
run->exit_reason = KVM_EXIT_INTR; run->exit_reason = KVM_EXIT_INTR;
r = (-EINTR << 2) | RESUME_HOST | (r & RESUME_FLAG_NV); r = (-EINTR << 2) | RESUME_HOST | (r & RESUME_FLAG_NV);
account_exit(vcpu, SIGNAL_EXITS); kvmppc_account_exit(vcpu, SIGNAL_EXITS);
} }
} }

55
arch/powerpc/kvm/timing.c
View file

@ -12,7 +12,7 @@
* along with this program; if not, write to the Free Software * along with this program; if not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* *
* Copyright IBM Corp. 2007 * Copyright IBM Corp. 2008
* *
* Authors: Hollis Blanchard <hollisb@us.ibm.com> * Authors: Hollis Blanchard <hollisb@us.ibm.com>
* Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> * Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
@ -24,10 +24,11 @@
#include <linux/debugfs.h> #include <linux/debugfs.h>
#include <linux/uaccess.h> #include <linux/uaccess.h>
#include "timing.h"
#include <asm/time.h> #include <asm/time.h>
#include <asm-generic/div64.h> #include <asm-generic/div64.h>
#include "timing.h"
void kvmppc_init_timing_stats(struct kvm_vcpu *vcpu) void kvmppc_init_timing_stats(struct kvm_vcpu *vcpu)
{ {
int i; int i;
@ -52,8 +53,7 @@ void kvmppc_init_timing_stats(struct kvm_vcpu *vcpu)
local_irq_enable(); local_irq_enable();
} }
static void add_exit_timing(struct kvm_vcpu *vcpu, static void add_exit_timing(struct kvm_vcpu *vcpu, u64 duration, int type)
u64 duration, int type)
{ {
u64 old; u64 old;
@ -148,21 +148,13 @@ static int kvmppc_exit_timing_show(struct seq_file *m, void *private)
{ {
struct kvm_vcpu *vcpu = m->private; struct kvm_vcpu *vcpu = m->private;
int i; int i;
u64 min, max;
seq_printf(m, "%s", "type count min max sum sum_squared\n");
for (i = 0; i < __NUMBER_OF_KVM_EXIT_TYPES; i++) { for (i = 0; i < __NUMBER_OF_KVM_EXIT_TYPES; i++) {
if (vcpu->arch.timing_min_duration[i] == 0xFFFFFFFF) seq_printf(m, "%12s %10d %10lld %10lld %20lld %20lld\n",
min = 0; kvm_exit_names[i],
else vcpu->arch.timing_count_type[i],
min = vcpu->arch.timing_min_duration[i];
if (vcpu->arch.timing_max_duration[i] == 0)
max = 0;
else
max = vcpu->arch.timing_max_duration[i];
seq_printf(m, "%12s: count %10d min %10lld "
"max %10lld sum %20lld sum_quad %20lld\n",
kvm_exit_names[i], vcpu->arch.timing_count_type[i],
vcpu->arch.timing_min_duration[i], vcpu->arch.timing_min_duration[i],
vcpu->arch.timing_max_duration[i], vcpu->arch.timing_max_duration[i],
vcpu->arch.timing_sum_duration[i], vcpu->arch.timing_sum_duration[i],
@ -171,31 +163,19 @@ static int kvmppc_exit_timing_show(struct seq_file *m, void *private)
return 0; return 0;
} }
/* Write 'c' to clear the timing statistics. */
static ssize_t kvmppc_exit_timing_write(struct file *file, static ssize_t kvmppc_exit_timing_write(struct file *file,
const char __user *user_buf, const char __user *user_buf,
size_t count, loff_t *ppos) size_t count, loff_t *ppos)
{ {
size_t len; int err = -EINVAL;
int err;
const char __user *p;
char c; char c;
len = 0; if (count > 1) {
p = user_buf;
while (len < count) {
if (get_user(c, p++))
err = -EFAULT;
if (c == 0 || c == '\n')
break;
len++;
}
if (len > 1) {
err = -EINVAL;
goto done; goto done;
} }
if (copy_from_user(&c, user_buf, sizeof(c))) { if (get_user(c, user_buf)) {
err = -EFAULT; err = -EFAULT;
goto done; goto done;
} }
@ -203,16 +183,13 @@ static ssize_t kvmppc_exit_timing_write(struct file *file,
if (c == 'c') { if (c == 'c') {
struct seq_file *seqf = (struct seq_file *)file->private_data; struct seq_file *seqf = (struct seq_file *)file->private_data;
struct kvm_vcpu *vcpu = seqf->private; struct kvm_vcpu *vcpu = seqf->private;
/* write does not affect out buffers previsously generated with /* Write does not affect our buffers previously generated with
* show. Seq file is locked here to prevent races of init with * show. seq_file is locked here to prevent races of init with
* a show call */ * a show call */
mutex_lock(&seqf->lock); mutex_lock(&seqf->lock);
kvmppc_init_timing_stats(vcpu); kvmppc_init_timing_stats(vcpu);
mutex_unlock(&seqf->lock); mutex_unlock(&seqf->lock);
err = count; err = count;
} else {
err = -EINVAL;
goto done;
} }
done: done:
@ -238,7 +215,7 @@ void kvmppc_create_vcpu_debugfs(struct kvm_vcpu *vcpu, unsigned int id)
static char dbg_fname[50]; static char dbg_fname[50];
struct dentry *debugfs_file; struct dentry *debugfs_file;
snprintf(dbg_fname, sizeof(dbg_fname), "vm%u_vcpu%03u_timing", snprintf(dbg_fname, sizeof(dbg_fname), "vm%u_vcpu%u_timing",
current->pid, id); current->pid, id);
debugfs_file = debugfs_create_file(dbg_fname, 0666, debugfs_file = debugfs_create_file(dbg_fname, 0666,
kvm_debugfs_dir, vcpu, kvm_debugfs_dir, vcpu,

6
arch/powerpc/kvm/timing.h
View file

@ -45,7 +45,7 @@ static inline void kvmppc_set_exit_type(struct kvm_vcpu *vcpu, int type) {}
#endif /* CONFIG_KVM_EXIT_TIMING */ #endif /* CONFIG_KVM_EXIT_TIMING */
/* account the exit in kvm_stats */ /* account the exit in kvm_stats */
static inline void account_exit_stat(struct kvm_vcpu *vcpu, int type) static inline void kvmppc_account_exit_stat(struct kvm_vcpu *vcpu, int type)
{ {
/* type has to be known at build time for optimization */ /* type has to be known at build time for optimization */
BUILD_BUG_ON(__builtin_constant_p(type)); BUILD_BUG_ON(__builtin_constant_p(type));
@ -93,10 +93,10 @@ static inline void account_exit_stat(struct kvm_vcpu *vcpu, int type)
} }
/* wrapper to set exit time and account for it in kvm_stats */ /* wrapper to set exit time and account for it in kvm_stats */
static inline void account_exit(struct kvm_vcpu *vcpu, int type) static inline void kvmppc_account_exit(struct kvm_vcpu *vcpu, int type)
{ {
kvmppc_set_exit_type(vcpu, type); kvmppc_set_exit_type(vcpu, type);
account_exit_stat(vcpu, type); kvmppc_account_exit_stat(vcpu, type);
} }
#endif /* __POWERPC_KVM_EXITTIMING_H__ */ #endif /* __POWERPC_KVM_EXITTIMING_H__ */