104 lines
3.0 KiB
C
104 lines
3.0 KiB
C
/*-
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* Copyright (c) 2011 NetApp, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/bus.h>
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#include <machine/intr_machdep.h>
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#include <machine/apicvar.h>
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#include <machine/segments.h>
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#include <machine/md_var.h>
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#include <machine/smp.h>
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#include <machine/vmm.h>
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#include "vmm_ipi.h"
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extern inthand_t IDTVEC(rsvd), IDTVEC(justreturn);
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/*
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* The default is to use the IPI_AST to interrupt a vcpu.
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*/
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static int ipinum = IPI_AST;
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CTASSERT(APIC_SPURIOUS_INT == 255);
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void
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vmm_ipi_init(void)
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{
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int idx;
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uintptr_t func;
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struct gate_descriptor *ip;
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/*
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* Search backwards from the highest IDT vector available for use
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* as our IPI vector. We install the 'justreturn' handler at that
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* vector and use it to interrupt the vcpus.
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*
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* We do this because the IPI_AST is heavyweight and saves all
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* registers in the trapframe. This is overkill for our use case
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* which is simply to EOI the interrupt and return.
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*/
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idx = APIC_SPURIOUS_INT;
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while (--idx >= APIC_IPI_INTS) {
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ip = &idt[idx];
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func = ((long)ip->gd_hioffset << 16 | ip->gd_looffset);
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if (func == (uintptr_t)&IDTVEC(rsvd)) {
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ipinum = idx;
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setidt(ipinum, IDTVEC(justreturn), SDT_SYSIGT,
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SEL_KPL, 0);
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break;
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}
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}
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if (ipinum != IPI_AST && bootverbose) {
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printf("vmm_ipi_init: installing ipi handler to interrupt "
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"vcpus at vector %d\n", ipinum);
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}
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}
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void
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vmm_ipi_cleanup(void)
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{
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if (ipinum != IPI_AST)
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setidt(ipinum, IDTVEC(rsvd), SDT_SYSIGT, SEL_KPL, 0);
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}
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void
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vm_interrupt_hostcpu(struct vm *vm, int vcpu)
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{
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int hostcpu;
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if (vcpu_is_running(vm, vcpu, &hostcpu) && hostcpu != curcpu)
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ipi_cpu(hostcpu, ipinum);
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}
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