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KVM: s390: use hrtimer for clock wakeup from idle - v2

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This patch reworks the s390 clock comparator wakeup to hrtimer. The clock
comparator is a per-cpu value that is compared against the TOD clock. If
ckc <= TOD an external interrupt 1004 is triggered. Since the clock comparator
and the TOD clock have a much higher resolution than jiffies we should use
hrtimers to trigger the wakeup. This speeds up guest nanosleep for small
values.

Since hrtimers callbacks run in hard-irq context, I added a tasklet to do
the actual work with enabled interrupts.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Christian Ehrhardt <ehrhardt@de.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Christian Borntraeger
2009-05-12 17:21:49 +02:00
committed by Avi Kivity
parent 2668dab794
commit ca8723023f
4 changed files with 35 additions and 14 deletions
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5
arch/s390/include/asm/kvm_host.h
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@ -13,6 +13,8 @@
#ifndef ASM_KVM_HOST_H
#define ASM_KVM_HOST_H
#include <linux/hrtimer.h>
#include <linux/interrupt.h>
#include <linux/kvm_host.h>
#include <asm/debug.h>
#include <asm/cpuid.h>
@ -210,7 +212,8 @@ struct kvm_vcpu_arch {
s390_fp_regs guest_fpregs;
unsigned int guest_acrs[NUM_ACRS];
struct kvm_s390_local_interrupt local_int;
struct timer_list ckc_timer;
struct hrtimer ckc_timer;
struct tasklet_struct tasklet;
union {
cpuid_t cpu_id;
u64 stidp_data;