mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-26 02:30:53 +07:00
40487c680d
This patch changes the PIC interrupts delivery. Now it is only delivered to vcpu0 when either condition is met (on vcpu0): 1. local APIC is hardware disabled 2. LVT0 is unmasked and configured to delivery mode ExtInt It fixes the 2x faster wall clock on x86_64 and SMP i386 Linux guests Signed-off-by: Eddie (Yaozu) Dong <eddie.dong@intel.com> Signed-off-by: Qing He <qing.he@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
/*
|
|
* irq.c: API for in kernel interrupt controller
|
|
* Copyright (c) 2007, Intel Corporation.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope 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, Inc., 59 Temple
|
|
* Place - Suite 330, Boston, MA 02111-1307 USA.
|
|
* Authors:
|
|
* Yaozu (Eddie) Dong <Eddie.dong@intel.com>
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include "kvm.h"
|
|
#include "irq.h"
|
|
|
|
/*
|
|
* check if there is pending interrupt without
|
|
* intack.
|
|
*/
|
|
int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
|
|
{
|
|
struct kvm_pic *s;
|
|
|
|
if (kvm_apic_has_interrupt(v) == -1) { /* LAPIC */
|
|
if (kvm_apic_accept_pic_intr(v)) {
|
|
s = pic_irqchip(v->kvm); /* PIC */
|
|
return s->output;
|
|
} else
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
EXPORT_SYMBOL_GPL(kvm_cpu_has_interrupt);
|
|
|
|
/*
|
|
* Read pending interrupt vector and intack.
|
|
*/
|
|
int kvm_cpu_get_interrupt(struct kvm_vcpu *v)
|
|
{
|
|
struct kvm_pic *s;
|
|
int vector;
|
|
|
|
vector = kvm_get_apic_interrupt(v); /* APIC */
|
|
if (vector == -1) {
|
|
if (kvm_apic_accept_pic_intr(v)) {
|
|
s = pic_irqchip(v->kvm);
|
|
s->output = 0; /* PIC */
|
|
vector = kvm_pic_read_irq(s);
|
|
}
|
|
}
|
|
return vector;
|
|
}
|
|
EXPORT_SYMBOL_GPL(kvm_cpu_get_interrupt);
|
|
|
|
static void vcpu_kick_intr(void *info)
|
|
{
|
|
#ifdef DEBUG
|
|
struct kvm_vcpu *vcpu = (struct kvm_vcpu *)info;
|
|
printk(KERN_DEBUG "vcpu_kick_intr %p \n", vcpu);
|
|
#endif
|
|
}
|
|
|
|
void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
|
|
{
|
|
int ipi_pcpu = vcpu->cpu;
|
|
|
|
if (waitqueue_active(&vcpu->wq)) {
|
|
wake_up_interruptible(&vcpu->wq);
|
|
++vcpu->stat.halt_wakeup;
|
|
}
|
|
if (vcpu->guest_mode)
|
|
smp_call_function_single(ipi_pcpu, vcpu_kick_intr, vcpu, 0, 0);
|
|
}
|
|
|
|
void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu)
|
|
{
|
|
kvm_inject_apic_timer_irqs(vcpu);
|
|
/* TODO: PIT, RTC etc. */
|
|
}
|
|
EXPORT_SYMBOL_GPL(kvm_inject_pending_timer_irqs);
|
|
|
|
void kvm_timer_intr_post(struct kvm_vcpu *vcpu, int vec)
|
|
{
|
|
kvm_apic_timer_intr_post(vcpu, vec);
|
|
/* TODO: PIT, RTC etc. */
|
|
}
|
|
EXPORT_SYMBOL_GPL(kvm_timer_intr_post);
|