KVM: In-kernel I/O APIC model (1fd4f2a5) · Commits · 戴 / test

drivers/kvm/Makefile

+1 −1

Original line number	Diff line number	Diff line
		@@ -2,7 +2,7 @@
		# Makefile for Kernel-based Virtual Machine module
		#

		kvm-objs := kvm_main.o mmu.o x86_emulate.o i8259.o irq.o lapic.o
		kvm-objs := kvm_main.o mmu.o x86_emulate.o i8259.o irq.o lapic.o ioapic.o
		obj-$(CONFIG_KVM) += kvm.o
		kvm-intel-objs = vmx.o
		obj-$(CONFIG_KVM_INTEL) += kvm-intel.o

drivers/kvm/ioapic.c

0 → 100644

+388 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2001 MandrakeSoft S.A.
		*
		* MandrakeSoft S.A.
		* 43, rue d'Aboukir
		* 75002 Paris - France
		* http://www.linux-mandrake.com/
		* http://www.mandrakesoft.com/
		*
		* This library is free software; you can redistribute it and/or
		* modify it under the terms of the GNU Lesser General Public
		* License as published by the Free Software Foundation; either
		* version 2 of the License, or (at your option) any later version.
		*
		* This library is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
		* Lesser General Public License for more details.
		*
		* You should have received a copy of the GNU Lesser General Public
		* License along with this library; if not, write to the Free Software
		* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
		*
		* Yunhong Jiang <yunhong.jiang@intel.com>
		* Yaozu (Eddie) Dong <eddie.dong@intel.com>
		* Based on Xen 3.1 code.
		*/

		#include "kvm.h"
		#include <linux/kvm.h>
		#include <linux/mm.h>
		#include <linux/highmem.h>
		#include <linux/smp.h>
		#include <linux/hrtimer.h>
		#include <linux/io.h>
		#include <asm/processor.h>
		#include <asm/msr.h>
		#include <asm/page.h>
		#include <asm/current.h>
		#include <asm/apicdef.h>
		#include <asm/io_apic.h>
		#include "irq.h"
		/* #define ioapic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg) */
		#define ioapic_debug(fmt, arg...)
		static void ioapic_deliver(struct kvm_ioapic *vioapic, int irq);

		static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic,
		unsigned long addr,
		unsigned long length)
		{
		unsigned long result = 0;

		switch (ioapic->ioregsel) {
		case IOAPIC_REG_VERSION:
		result = ((((IOAPIC_NUM_PINS - 1) & 0xff) << 16)
		\| (IOAPIC_VERSION_ID & 0xff));
		break;

		case IOAPIC_REG_APIC_ID:
		case IOAPIC_REG_ARB_ID:
		result = ((ioapic->id & 0xf) << 24);
		break;

		default:
		{
		u32 redir_index = (ioapic->ioregsel - 0x10) >> 1;
		u64 redir_content;

		ASSERT(redir_index < IOAPIC_NUM_PINS);

		redir_content = ioapic->redirtbl[redir_index].bits;
		result = (ioapic->ioregsel & 0x1) ?
		(redir_content >> 32) & 0xffffffff :
		redir_content & 0xffffffff;
		break;
		}
		}

		return result;
		}

		static void ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx)
		{
		union ioapic_redir_entry *pent;

		pent = &ioapic->redirtbl[idx];

		if (!pent->fields.mask) {
		ioapic_deliver(ioapic, idx);
		if (pent->fields.trig_mode == IOAPIC_LEVEL_TRIG)
		pent->fields.remote_irr = 1;
		}
		if (!pent->fields.trig_mode)
		ioapic->irr &= ~(1 << idx);
		}

		static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
		{
		unsigned index;

		switch (ioapic->ioregsel) {
		case IOAPIC_REG_VERSION:
		/* Writes are ignored. */
		break;

		case IOAPIC_REG_APIC_ID:
		ioapic->id = (val >> 24) & 0xf;
		break;

		case IOAPIC_REG_ARB_ID:
		break;

		default:
		index = (ioapic->ioregsel - 0x10) >> 1;

		ioapic_debug("change redir index %x val %x", index, val);
		if (index >= IOAPIC_NUM_PINS)
		return;
		if (ioapic->ioregsel & 1) {
		ioapic->redirtbl[index].bits &= 0xffffffff;
		ioapic->redirtbl[index].bits \|= (u64) val << 32;
		} else {
		ioapic->redirtbl[index].bits &= ~0xffffffffULL;
		ioapic->redirtbl[index].bits \|= (u32) val;
		ioapic->redirtbl[index].fields.remote_irr = 0;
		}
		if (ioapic->irr & (1 << index))
		ioapic_service(ioapic, index);
		break;
		}
		}

		static void ioapic_inj_irq(struct kvm_ioapic *ioapic,
		struct kvm_lapic *target,
		u8 vector, u8 trig_mode, u8 delivery_mode)
		{
		ioapic_debug("irq %d trig %d deliv %d", vector, trig_mode,
		delivery_mode);

		ASSERT((delivery_mode == dest_Fixed) \|\|
		(delivery_mode == dest_LowestPrio));

		kvm_apic_set_irq(target, vector, trig_mode);
		}

		static u32 ioapic_get_delivery_bitmask(struct kvm_ioapic *ioapic, u8 dest,
		u8 dest_mode)
		{
		u32 mask = 0;
		int i;
		struct kvm *kvm = ioapic->kvm;
		struct kvm_vcpu *vcpu;

		ioapic_debug("dest %d dest_mode %d", dest, dest_mode);

		if (dest_mode == 0) { /* Physical mode. */
		if (dest == 0xFF) { /* Broadcast. */
		for (i = 0; i < KVM_MAX_VCPUS; ++i)
		if (kvm->vcpus[i] && kvm->vcpus[i]->apic)
		mask \|= 1 << i;
		return mask;
		}
		for (i = 0; i < KVM_MAX_VCPUS; ++i) {
		vcpu = kvm->vcpus[i];
		if (!vcpu)
		continue;
		if (kvm_apic_match_physical_addr(vcpu->apic, dest)) {
		if (vcpu->apic)
		mask = 1 << i;
		break;
		}
		}
		} else if (dest != 0) /* Logical mode, MDA non-zero. */
		for (i = 0; i < KVM_MAX_VCPUS; ++i) {
		vcpu = kvm->vcpus[i];
		if (!vcpu)
		continue;
		if (vcpu->apic &&
		kvm_apic_match_logical_addr(vcpu->apic, dest))
		mask \|= 1 << vcpu->vcpu_id;
		}
		ioapic_debug("mask %x", mask);
		return mask;
		}

		static void ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
		{
		u8 dest = ioapic->redirtbl[irq].fields.dest_id;
		u8 dest_mode = ioapic->redirtbl[irq].fields.dest_mode;
		u8 delivery_mode = ioapic->redirtbl[irq].fields.delivery_mode;
		u8 vector = ioapic->redirtbl[irq].fields.vector;
		u8 trig_mode = ioapic->redirtbl[irq].fields.trig_mode;
		u32 deliver_bitmask;
		struct kvm_lapic *target;
		struct kvm_vcpu *vcpu;
		int vcpu_id;

		ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x "
		"vector=%x trig_mode=%x",
		dest, dest_mode, delivery_mode, vector, trig_mode);

		deliver_bitmask = ioapic_get_delivery_bitmask(ioapic, dest, dest_mode);
		if (!deliver_bitmask) {
		ioapic_debug("no target on destination");
		return;
		}

		switch (delivery_mode) {
		case dest_LowestPrio:
		target =
		kvm_apic_round_robin(ioapic->kvm, vector, deliver_bitmask);
		if (target != NULL)
		ioapic_inj_irq(ioapic, target, vector,
		trig_mode, delivery_mode);
		else
		ioapic_debug("null round robin: "
		"mask=%x vector=%x delivery_mode=%x",
		deliver_bitmask, vector, dest_LowestPrio);
		break;
		case dest_Fixed:
		for (vcpu_id = 0; deliver_bitmask != 0; vcpu_id++) {
		if (!(deliver_bitmask & (1 << vcpu_id)))
		continue;
		deliver_bitmask &= ~(1 << vcpu_id);
		vcpu = ioapic->kvm->vcpus[vcpu_id];
		if (vcpu) {
		target = vcpu->apic;
		ioapic_inj_irq(ioapic, target, vector,
		trig_mode, delivery_mode);
		}
		}
		break;

		/* TODO: NMI */
		default:
		printk(KERN_WARNING "Unsupported delivery mode %d\n",
		delivery_mode);
		break;
		}
		}

		void kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level)
		{
		u32 old_irr = ioapic->irr;
		u32 mask = 1 << irq;
		union ioapic_redir_entry entry;

		if (irq >= 0 && irq < IOAPIC_NUM_PINS) {
		entry = ioapic->redirtbl[irq];
		level ^= entry.fields.polarity;
		if (!level)
		ioapic->irr &= ~mask;
		else {
		ioapic->irr \|= mask;
		if ((!entry.fields.trig_mode && old_irr != ioapic->irr)
		\|\| !entry.fields.remote_irr)
		ioapic_service(ioapic, irq);
		}
		}
		}

		static int get_eoi_gsi(struct kvm_ioapic *ioapic, int vector)
		{
		int i;

		for (i = 0; i < IOAPIC_NUM_PINS; i++)
		if (ioapic->redirtbl[i].fields.vector == vector)
		return i;
		return -1;
		}

		void kvm_ioapic_update_eoi(struct kvm *kvm, int vector)
		{
		struct kvm_ioapic *ioapic = kvm->vioapic;
		union ioapic_redir_entry *ent;
		int gsi;

		gsi = get_eoi_gsi(ioapic, vector);
		if (gsi == -1) {
		printk(KERN_WARNING "Can't find redir item for %d EOI\n",
		vector);
		return;
		}

		ent = &ioapic->redirtbl[gsi];
		ASSERT(ent->fields.trig_mode == IOAPIC_LEVEL_TRIG);

		ent->fields.remote_irr = 0;
		if (!ent->fields.mask && (ioapic->irr & (1 << gsi)))
		ioapic_deliver(ioapic, gsi);
		}

		static int ioapic_in_range(struct kvm_io_device *this, gpa_t addr)
		{
		struct kvm_ioapic ioapic = (struct kvm_ioapic )this->private;

		return ((addr >= ioapic->base_address &&
		(addr < ioapic->base_address + IOAPIC_MEM_LENGTH)));
		}

		static void ioapic_mmio_read(struct kvm_io_device *this, gpa_t addr, int len,
		void *val)
		{
		struct kvm_ioapic ioapic = (struct kvm_ioapic )this->private;
		u32 result;

		ioapic_debug("addr %lx", (unsigned long)addr);
		ASSERT(!(addr & 0xf)); /* check alignment */

		addr &= 0xff;
		switch (addr) {
		case IOAPIC_REG_SELECT:
		result = ioapic->ioregsel;
		break;

		case IOAPIC_REG_WINDOW:
		result = ioapic_read_indirect(ioapic, addr, len);
		break;

		default:
		result = 0;
		break;
		}
		switch (len) {
		case 8:
		(u64 ) val = result;
		break;
		case 1:
		case 2:
		case 4:
		memcpy(val, (char *)&result, len);
		break;
		default:
		printk(KERN_WARNING "ioapic: wrong length %d\n", len);
		}
		}

		static void ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len,
		const void *val)
		{
		struct kvm_ioapic ioapic = (struct kvm_ioapic )this->private;
		u32 data;

		ioapic_debug("ioapic_mmio_write addr=%lx len=%d val=%p\n",
		addr, len, val);
		ASSERT(!(addr & 0xf)); /* check alignment */
		if (len == 4 \|\| len == 8)
		data = (u32 ) val;
		else {
		printk(KERN_WARNING "ioapic: Unsupported size %d\n", len);
		return;
		}

		addr &= 0xff;
		switch (addr) {
		case IOAPIC_REG_SELECT:
		ioapic->ioregsel = data;
		break;

		case IOAPIC_REG_WINDOW:
		ioapic_write_indirect(ioapic, data);
		break;

		default:
		break;
		}
		}

		int kvm_ioapic_init(struct kvm *kvm)
		{
		struct kvm_ioapic *ioapic;
		int i;

		ioapic = kzalloc(sizeof(struct kvm_ioapic), GFP_KERNEL);
		if (!ioapic)
		return -ENOMEM;
		kvm->vioapic = ioapic;
		for (i = 0; i < IOAPIC_NUM_PINS; i++)
		ioapic->redirtbl[i].fields.mask = 1;
		ioapic->base_address = IOAPIC_DEFAULT_BASE_ADDRESS;
		ioapic->dev.read = ioapic_mmio_read;
		ioapic->dev.write = ioapic_mmio_write;
		ioapic->dev.in_range = ioapic_in_range;
		ioapic->dev.private = ioapic;
		ioapic->kvm = kvm;
		kvm_io_bus_register_dev(&kvm->mmio_bus, &ioapic->dev);
		return 0;
		}

drivers/kvm/irq.c

+0 −4

Original line number	Diff line number	Diff line
		@@ -74,7 +74,3 @@ void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
		smp_call_function_single(ipi_pcpu, vcpu_kick_intr, vcpu, 0, 0);
		}

		void kvm_ioapic_update_eoi(struct kvm *kvm, int vector)
		{
		/* TODO: for kernel IOAPIC */
		}

drivers/kvm/irq.h

+51 −0

Original line number	Diff line number	Diff line
		@@ -60,6 +60,50 @@ int kvm_pic_read_irq(struct kvm_pic *s);
		int kvm_cpu_get_interrupt(struct kvm_vcpu *v);
		int kvm_cpu_has_interrupt(struct kvm_vcpu *v);

		#define IOAPIC_NUM_PINS 24
		#define IOAPIC_VERSION_ID 0x11 /* IOAPIC version */
		#define IOAPIC_EDGE_TRIG 0
		#define IOAPIC_LEVEL_TRIG 1

		#define IOAPIC_DEFAULT_BASE_ADDRESS 0xfec00000
		#define IOAPIC_MEM_LENGTH 0x100

		/* Direct registers. */
		#define IOAPIC_REG_SELECT 0x00
		#define IOAPIC_REG_WINDOW 0x10
		#define IOAPIC_REG_EOI 0x40 /* IA64 IOSAPIC only */

		/* Indirect registers. */
		#define IOAPIC_REG_APIC_ID 0x00 /* x86 IOAPIC only */
		#define IOAPIC_REG_VERSION 0x01
		#define IOAPIC_REG_ARB_ID 0x02 /* x86 IOAPIC only */

		struct kvm_ioapic {
		u64 base_address;
		u32 ioregsel;
		u32 id;
		u32 irr;
		u32 pad;
		union ioapic_redir_entry {
		u64 bits;
		struct {
		u8 vector;
		u8 delivery_mode:3;
		u8 dest_mode:1;
		u8 delivery_status:1;
		u8 polarity:1;
		u8 remote_irr:1;
		u8 trig_mode:1;
		u8 mask:1;
		u8 reserve:7;
		u8 reserved[4];
		u8 dest_id;
		} fields;
		} redirtbl[IOAPIC_NUM_PINS];
		struct kvm_io_device dev;
		struct kvm *kvm;
		};

		struct kvm_lapic {
		unsigned long base_address;
		struct kvm_io_device dev;
		@@ -96,8 +140,15 @@ void kvm_free_apic(struct kvm_lapic *apic);
		u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu);
		void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8);
		void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value);
		struct kvm_lapic kvm_apic_round_robin(struct kvm kvm, u8 vector,
		unsigned long bitmap);
		u64 kvm_get_apic_base(struct kvm_vcpu *vcpu);
		void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data);
		int kvm_apic_match_physical_addr(struct kvm_lapic *apic, u16 dest);
		void kvm_ioapic_update_eoi(struct kvm *kvm, int vector);
		int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda);
		int kvm_apic_set_irq(struct kvm_lapic *apic, u8 vec, u8 trig);
		int kvm_ioapic_init(struct kvm *kvm);
		void kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level);

		#endif

drivers/kvm/kvm.h

+6 −0

Original line number	Diff line number	Diff line
		@@ -410,6 +410,7 @@ struct kvm {
		struct kvm_io_bus mmio_bus;
		struct kvm_io_bus pio_bus;
		struct kvm_pic *vpic;
		struct kvm_ioapic *vioapic;
		};

		static inline struct kvm_pic pic_irqchip(struct kvm kvm)
		@@ -417,6 +418,11 @@ static inline struct kvm_pic pic_irqchip(struct kvm kvm)
		return kvm->vpic;
		}

		static inline struct kvm_ioapic ioapic_irqchip(struct kvm kvm)
		{
		return kvm->vioapic;
		}

		static inline int irqchip_in_kernel(struct kvm *kvm)
		{
		return pic_irqchip(kvm) != 0;

Admin message