Commit c532de5a authored by Xianglai Li's avatar Xianglai Li Committed by Huacai Chen
Browse files

LoongArch: KVM: Add IPI device support 



Add device model for IPI interrupt controller, implement basic create &
destroy interfaces, and register device model to kvm device table.

Signed-off-by: default avatarTianrui Zhao <zhaotianrui@loongson.cn>
Signed-off-by: default avatarXianglai Li <lixianglai@loongson.cn>
Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent 948ccbd9

arch/loongarch/include/asm/kvm_host.h

+4 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ 


#include <asm/inst.h>

#include <asm/kvm_mmu.h>

#include <asm/kvm_ipi.h>

#include <asm/loongarch.h>



/* Loongarch KVM register ids */
@@ -117,6 +118,7 @@ struct kvm_arch { 


	s64 time_offset;

	struct kvm_context __percpu *vmcs;

	struct loongarch_ipi *ipi;

};



#define CSR_MAX_NUMS		0x800
@@ -221,6 +223,8 @@ struct kvm_vcpu_arch { 
	int last_sched_cpu;

	/* mp state */

	struct kvm_mp_state mp_state;

	/* ipi state */

	struct ipi_state ipi_state;

	/* cpucfg */

	u32 cpucfg[KVM_MAX_CPUCFG_REGS];

arch/loongarch/include/asm/kvm_ipi.h

0 → 100644
+33 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

/*

 * Copyright (C) 2024 Loongson Technology Corporation Limited

 */



#ifndef __ASM_KVM_IPI_H

#define __ASM_KVM_IPI_H



#include <kvm/iodev.h>



#define LARCH_INT_IPI			12



struct loongarch_ipi {

	spinlock_t lock;

	struct kvm *kvm;

	struct kvm_io_device device;

};



struct ipi_state {

	spinlock_t lock;

	uint32_t status;

	uint32_t en;

	uint32_t set;

	uint32_t clear;

	uint64_t buf[4];

};



#define IOCSR_IPI_BASE		0x1000

#define IOCSR_IPI_SIZE		0x160



int kvm_loongarch_register_ipi_device(void);



#endif

arch/loongarch/kvm/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -18,5 +18,6 @@ kvm-y += timer.o 
kvm-y += tlb.o

kvm-y += vcpu.o

kvm-y += vm.o

kvm-y += intc/ipi.o



CFLAGS_exit.o	+= $(call cc-option,-Wno-override-init,)

arch/loongarch/kvm/intc/ipi.c

0 → 100644
+112 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/*

 * Copyright (C) 2024 Loongson Technology Corporation Limited

 */



#include <linux/kvm_host.h>

#include <asm/kvm_ipi.h>

#include <asm/kvm_vcpu.h>



static int kvm_ipi_read(struct kvm_vcpu *vcpu,

			struct kvm_io_device *dev,

			gpa_t addr, int len, void *val)

{

	return 0;

}



static int kvm_ipi_write(struct kvm_vcpu *vcpu,

			struct kvm_io_device *dev,

			gpa_t addr, int len, const void *val)

{

	return 0;

}



static const struct kvm_io_device_ops kvm_ipi_ops = {

	.read	= kvm_ipi_read,

	.write	= kvm_ipi_write,

};



static int kvm_ipi_get_attr(struct kvm_device *dev,

			struct kvm_device_attr *attr)

{

	return 0;

}



static int kvm_ipi_set_attr(struct kvm_device *dev,

			struct kvm_device_attr *attr)

{

	return 0;

}



static int kvm_ipi_create(struct kvm_device *dev, u32 type)

{

	int ret;

	struct kvm *kvm;

	struct kvm_io_device *device;

	struct loongarch_ipi *s;



	if (!dev) {

		kvm_err("%s: kvm_device ptr is invalid!\n", __func__);

		return -EINVAL;

	}



	kvm = dev->kvm;

	if (kvm->arch.ipi) {

		kvm_err("%s: LoongArch IPI has already been created!\n", __func__);

		return -EINVAL;

	}



	s = kzalloc(sizeof(struct loongarch_ipi), GFP_KERNEL);

	if (!s)

		return -ENOMEM;



	spin_lock_init(&s->lock);

	s->kvm = kvm;



	/*

	 * Initialize IOCSR device

	 */

	device = &s->device;

	kvm_iodevice_init(device, &kvm_ipi_ops);

	mutex_lock(&kvm->slots_lock);

	ret = kvm_io_bus_register_dev(kvm, KVM_IOCSR_BUS, IOCSR_IPI_BASE, IOCSR_IPI_SIZE, device);

	mutex_unlock(&kvm->slots_lock);

	if (ret < 0) {

		kvm_err("%s: Initialize IOCSR dev failed, ret = %d\n", __func__, ret);

		goto err;

	}



	kvm->arch.ipi = s;

	return 0;



err:

	kfree(s);

	return -EFAULT;

}



static void kvm_ipi_destroy(struct kvm_device *dev)

{

	struct kvm *kvm;

	struct loongarch_ipi *ipi;



	if (!dev || !dev->kvm || !dev->kvm->arch.ipi)

		return;



	kvm = dev->kvm;

	ipi = kvm->arch.ipi;

	kvm_io_bus_unregister_dev(kvm, KVM_IOCSR_BUS, &ipi->device);

	kfree(ipi);

}



static struct kvm_device_ops kvm_ipi_dev_ops = {

	.name = "kvm-loongarch-ipi",

	.create = kvm_ipi_create,

	.destroy = kvm_ipi_destroy,

	.set_attr = kvm_ipi_set_attr,

	.get_attr = kvm_ipi_get_attr,

};



int kvm_loongarch_register_ipi_device(void)

{

	return kvm_register_device_ops(&kvm_ipi_dev_ops, KVM_DEV_TYPE_LOONGARCH_IPI);

}

arch/loongarch/kvm/main.c

+5 −2
Original line number Diff line number Diff line
@@ -313,7 +313,7 @@ void kvm_arch_disable_virtualization_cpu(void) 


static int kvm_loongarch_env_init(void)

{

	int cpu, order;

	int cpu, order, ret;

	void *addr;

	struct kvm_context *context;
@@ -368,7 +368,10 @@ static int kvm_loongarch_env_init(void) 


	kvm_init_gcsr_flag();



	return 0;

	/* Register LoongArch IPI interrupt controller interface. */

	ret = kvm_loongarch_register_ipi_device();



	return ret;

}



static void kvm_loongarch_env_exit(void)