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Use lapic_ipi_alloc() to dynamically allocate IPI slots needed by bhyve when

Browse Source 
vmm.ko is loaded.

Also relocate the 'justreturn' IPI handler to be alongside all other handlers.

Requested by:	kib
This commit is contained in:
Neel Natu 2015-03-14 02:32:08 +00:00
parent 8958d18cb3
commit 18a2b08e65
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=279971
11 changed files with 41 additions and 187 deletions
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31
sys/amd64/amd64/apic_vector.S
View File

@ -301,4 +301,35 @@ IDTVEC(rendezvous)
call smp_rendezvous_action
call as_lapic_eoi
jmp doreti
/*
* IPI handler whose purpose is to interrupt the CPU with minimum overhead.
* This is used by bhyve to force a host cpu executing in guest context to
* trap into the hypervisor.
*
* This handler is different from other IPI handlers in the following aspects:
*
* 1. It doesn't push a trapframe on the stack.
*
* This implies that a DDB backtrace involving 'justreturn' will skip the
* function that was interrupted by this handler.
*
* 2. It doesn't 'swapgs' when userspace is interrupted.
*
* The 'justreturn' handler does not access any pcpu data so it is not an
* issue. Moreover the 'justreturn' handler can only be interrupted by an NMI
* whose handler already doesn't trust GS.base when kernel code is interrupted.
*/
.text
SUPERALIGN_TEXT
IDTVEC(justreturn)
pushq %rax
pushq %rcx
pushq %rdx
call as_lapic_eoi
popq %rdx
popq %rcx
popq %rax
jmp doreti_iret
#endif /* SMP */

1
sys/amd64/include/smp.h
View File

@ -54,6 +54,7 @@ inthand_t
IDTVEC(ipi_intr_bitmap_handler), /* Bitmap based IPIs */
IDTVEC(cpustop), /* CPU stops & waits to be restarted */
IDTVEC(cpususpend), /* CPU suspends & waits to be resumed */
IDTVEC(justreturn), /* interrupt CPU with minimum overhead */
IDTVEC(rendezvous); /* handle CPU rendezvous */
struct pmap;

1
sys/amd64/vmm/intel/ept.c
View File

@ -43,7 +43,6 @@ __FBSDID("$FreeBSD$");
#include <machine/vmm.h>
#include "vmx_cpufunc.h"
#include "vmm_ipi.h"
#include "ept.h"
#define EPT_SUPPORTS_EXEC_ONLY(cap) ((cap) & (1UL << 0))

11
sys/amd64/vmm/intel/vmx.c
View File

@ -55,7 +55,6 @@ __FBSDID("$FreeBSD$");
#include "vmm_lapic.h"
#include "vmm_host.h"
#include "vmm_ioport.h"
#include "vmm_ipi.h"
#include "vmm_ktr.h"
#include "vmm_stat.h"
#include "vatpic.h"
@ -175,7 +174,7 @@ static int posted_interrupts;
SYSCTL_INT(_hw_vmm_vmx_cap, OID_AUTO, posted_interrupts, CTLFLAG_RD,
&posted_interrupts, 0, "APICv posted interrupt support");
static int pirvec;
static int pirvec = -1;
SYSCTL_INT(_hw_vmm_vmx, OID_AUTO, posted_interrupt_vector, CTLFLAG_RD,
&pirvec, 0, "APICv posted interrupt vector");
@ -485,8 +484,8 @@ static int
vmx_cleanup(void)
{
if (pirvec != 0)
vmm_ipi_free(pirvec);
if (pirvec >= 0)
lapic_ipi_free(pirvec);
if (vpid_unr != NULL) {
delete_unrhdr(vpid_unr);
@ -694,8 +693,8 @@ vmx_init(int ipinum)
MSR_VMX_TRUE_PINBASED_CTLS, PINBASED_POSTED_INTERRUPT, 0,
&tmp);
if (error == 0) {
pirvec = vmm_ipi_alloc();
if (pirvec == 0) {
pirvec = lapic_ipi_alloc(&IDTVEC(justreturn));
if (pirvec < 0) {
if (bootverbose) {
printf("vmx_init: unable to allocate "
"posted interrupt vector\n");

1
sys/amd64/vmm/io/vlapic.c
View File

@ -45,7 +45,6 @@ __FBSDID("$FreeBSD$");
#include <machine/vmm.h>
#include "vmm_ipi.h"
#include "vmm_lapic.h"
#include "vmm_ktr.h"
#include "vmm_stat.h"

7
sys/amd64/vmm/vmm.c
View File

@ -76,7 +76,6 @@ __FBSDID("$FreeBSD$");
#include "vlapic.h"
#include "vpmtmr.h"
#include "vrtc.h"
#include "vmm_ipi.h"
#include "vmm_stat.h"
#include "vmm_lapic.h"
@ -298,8 +297,8 @@ vmm_init(void)
vmm_host_state_init();
vmm_ipinum = vmm_ipi_alloc();
if (vmm_ipinum == 0)
vmm_ipinum = lapic_ipi_alloc(&IDTVEC(justreturn));
if (vmm_ipinum < 0)
vmm_ipinum = IPI_AST;
error = vmm_mem_init();
@ -338,7 +337,7 @@ vmm_handler(module_t mod, int what, void *arg)
vmm_resume_p = NULL;
iommu_cleanup();
if (vmm_ipinum != IPI_AST)
vmm_ipi_free(vmm_ipinum);
lapic_ipi_free(vmm_ipinum);
error = VMM_CLEANUP();
/*
* Something bad happened - prevent new

93
sys/amd64/vmm/vmm_ipi.c
View File

@ -1,93 +0,0 @@
/*-
* Copyright (c) 2011 NetApp, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/bus.h>
#include <machine/intr_machdep.h>
#include <x86/apicvar.h>
#include <machine/segments.h>
#include <machine/md_var.h>
#include <machine/vmm.h>
#include "vmm_ipi.h"
extern inthand_t IDTVEC(rsvd), IDTVEC(justreturn);
CTASSERT(APIC_SPURIOUS_INT == 255);
int
vmm_ipi_alloc(void)
{
int idx;
uintptr_t func;
struct gate_descriptor *ip;
/*
* Search backwards from the highest IDT vector available for use
* as our IPI vector. We install the 'justreturn' handler at that
* vector and use it to interrupt the vcpus.
*
* We do this because the IPI_AST is heavyweight and saves all
* registers in the trapframe. This is overkill for our use case
* which is simply to EOI the interrupt and return.
*/
idx = APIC_SPURIOUS_INT;
while (--idx >= APIC_IPI_INTS) {
ip = &idt[idx];
func = ((long)ip->gd_hioffset << 16 | ip->gd_looffset);
if (func == (uintptr_t)&IDTVEC(rsvd)) {
setidt(idx , IDTVEC(justreturn), SDT_SYSIGT,
SEL_KPL, 0);
return (idx);
}
}
return (0);
}
void
vmm_ipi_free(int ipinum)
{
uintptr_t func;
struct gate_descriptor *ip;
KASSERT(ipinum >= APIC_IPI_INTS && ipinum < APIC_SPURIOUS_INT,
("invalid ipi %d", ipinum));
ip = &idt[ipinum];
func = ((long)ip->gd_hioffset << 16 | ip->gd_looffset);
KASSERT(func == (uintptr_t)&IDTVEC(justreturn),
("invalid ipi %d", ipinum));
setidt(ipinum, IDTVEC(rsvd), SDT_SYSIGT, SEL_KPL, 0);
}

35
sys/amd64/vmm/vmm_ipi.h
View File

@ -1,35 +0,0 @@
/*-
* Copyright (c) 2011 NetApp, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _VMM_IPI_H_
#define _VMM_IPI_H_
int vmm_ipi_alloc(void);
void vmm_ipi_free(int num);
#endif

1
sys/amd64/vmm/vmm_lapic.c
View File

@ -37,7 +37,6 @@ __FBSDID("$FreeBSD$");
#include <x86/apicreg.h>
#include <machine/vmm.h>
#include "vmm_ipi.h"
#include "vmm_ktr.h"
#include "vmm_lapic.h"
#include "vlapic.h"

43
sys/amd64/vmm/vmm_support.S
View File

@ -1,43 +0,0 @@
/*-
* Copyright (c) 2011 NetApp, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#define LOCORE
#include <machine/asmacros.h>
.text
SUPERALIGN_TEXT
IDTVEC(justreturn)
pushq %rdx
pushq %rax
pushq %rcx
call as_lapic_eoi
popq %rcx
popq %rax
popq %rdx
jmp doreti_iret

4
sys/modules/vmm/Makefile
View File

@ -19,13 +19,11 @@ SRCS+= vmm.c \
vmm_host.c \
vmm_instruction_emul.c \
vmm_ioport.c \
vmm_ipi.c \
vmm_lapic.c \
vmm_mem.c \
vmm_stat.c \
vmm_util.c \
x86.c \
vmm_support.S
x86.c
.PATH: ${.CURDIR}/../../amd64/vmm/io
SRCS+= iommu.c \