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KVM: x86: Run PIT work in own kthread

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We can't run PIT IRQ injection work in the interrupt context of the host
timer. This would allow the user to influence the handler complexity by
asking for a broadcast to a large number of VCPUs. Therefore, this work
was pushed into workqueue context in 9d244caf2e. However, this prevents
prioritizing the PIT injection over other task as workqueues share
kernel threads.

This replaces the workqueue with a kthread worker and gives that thread
a name in the format "kvm-pit/<owner-process-pid>". That allows to
identify and adjust the kthread priority according to the VM process
parameters.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Jan Kiszka
2012-04-24 16:40:17 +02:00
committed by Marcelo Tosatti
parent 0589ff6c11
commit b6ddf05ff6
3 changed files with 32 additions and 14 deletions
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7
arch/x86/kvm/i8254.h
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@@ -1,6 +1,8 @@
#ifndef __I8254_H
#define __I8254_H
#include <linux/kthread.h>
#include "iodev.h"
struct kvm_kpit_channel_state {
@@ -39,8 +41,9 @@ struct kvm_pit {
struct kvm_kpit_state pit_state;
int irq_source_id;
struct kvm_irq_mask_notifier mask_notifier;
struct workqueue_struct *wq;
struct work_struct expired;
struct kthread_worker worker;
struct task_struct *worker_task;
struct kthread_work expired;
};
#define KVM_PIT_BASE_ADDRESS 0x40