Commit bd254ad9 authored by Xianglai Li's avatar Xianglai Li
Browse files

LoongArch: KVM: Add irqfd support 

LoongArch inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/IB8FOC



------------------------------------------

Enable the KVM_IRQ_ROUTING KVM_IRQCHIP KVM_MSI configuration item,
increase the KVM_CAP_IRQCHIP capability, and implement the query
interface of the kernel irqchip.

Signed-off-by: default avatarXianglai Li <lixianglai@loongson.cn>
parent 9a0f37dc

arch/loongarch/include/uapi/asm/kvm.h

+2 −0
Original line number Diff line number Diff line
@@ -115,6 +115,8 @@ struct kvm_iocsr_entry { 
#define KVM_IRQCHIP_NUM_PINS	64

#define KVM_MAX_CORES		256



#define KVM_LOONGARCH_VM_HAVE_IRQCHIP		0x40000001



#define KVM_DEV_LOONGARCH_IPI_GRP_REGS		0x40000002



#define KVM_DEV_LOONGARCH_EXTIOI_GRP_REGS	0x40000003

arch/loongarch/kvm/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -24,6 +24,10 @@ config KVM 
	select HAVE_KVM_DIRTY_RING_ACQ_REL

	select HAVE_KVM_EVENTFD

	select HAVE_KVM_VCPU_ASYNC_IOCTL

	select HAVE_KVM_IRQ_ROUTING

	select HAVE_KVM_IRQCHIP

	select HAVE_KVM_IRQFD

	select HAVE_KVM_MSI

	select KVM_GENERIC_DIRTYLOG_READ_PROTECT

	select KVM_GENERIC_HARDWARE_ENABLING

	select KVM_MMIO

arch/loongarch/kvm/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -21,5 +21,6 @@ kvm-y += vm.o 
kvm-y += intc/ipi.o

kvm-y += intc/extioi.o

kvm-y += intc/pch_pic.o

kvm-y += irqfd.o



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

arch/loongarch/kvm/intc/pch_pic.c

+28 −0
Original line number Diff line number Diff line
@@ -451,6 +451,29 @@ static int kvm_loongarch_pch_pic_set_attr(struct kvm_device *dev, 
	return ret;

}



static int kvm_setup_default_irq_routing(struct kvm *kvm)

{

	struct kvm_irq_routing_entry *entries;



	u32 nr = KVM_IRQCHIP_NUM_PINS;

	int i, ret;



	entries = kcalloc(nr, sizeof(*entries), GFP_KERNEL);

	if (!entries)

		return -ENOMEM;



	for (i = 0; i < nr; i++) {

		entries[i].gsi = i;

		entries[i].type = KVM_IRQ_ROUTING_IRQCHIP;

		entries[i].u.irqchip.irqchip = 0;

		entries[i].u.irqchip.pin = i;

	}

	ret = kvm_set_irq_routing(kvm, entries, nr, 0);

	kfree(entries);



	return 0;

}



static void kvm_loongarch_pch_pic_destroy(struct kvm_device *dev)

{

	struct kvm *kvm;
@@ -476,6 +499,7 @@ static void kvm_loongarch_pch_pic_destroy(struct kvm_device *dev) 


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

{

	int ret;

	struct loongarch_pch_pic *s;

	struct kvm *kvm = dev->kvm;
@@ -483,6 +507,10 @@ static int kvm_loongarch_pch_pic_create(struct kvm_device *dev, u32 type) 
	if (kvm->arch.pch_pic)

		return -EINVAL;



	ret = kvm_setup_default_irq_routing(kvm);

	if (ret)

		return -ENOMEM;



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

	if (!s)

		return -ENOMEM;

arch/loongarch/kvm/irqfd.c

0 → 100644
+87 −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 <trace/events/kvm.h>

#include <asm/kvm_pch_pic.h>



static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,

					struct kvm *kvm, int irq_source_id,

					int level, bool line_status)

{

	/* ioapic pin (0 ~ 64) <---> gsi(0 ~ 64) */

	pch_pic_set_irq(kvm->arch.pch_pic, e->irqchip.pin, level);



	return 0;

}



/*

 * kvm_set_routing_entry: populate a kvm routing entry

 * from a user routing entry

 *

 * @kvm: the VM this entry is applied to

 * @e: kvm kernel routing entry handle

 * @ue: user api routing entry handle

 * return 0 on success, -EINVAL on errors.

 */

int kvm_set_routing_entry(struct kvm *kvm,

			struct kvm_kernel_irq_routing_entry *e,

			const struct kvm_irq_routing_entry *ue)

{

	int r = -EINVAL;



	switch (ue->type) {

	case KVM_IRQ_ROUTING_IRQCHIP:

		e->set = kvm_set_ioapic_irq;



		e->irqchip.irqchip = ue->u.irqchip.irqchip;

		e->irqchip.pin = ue->u.irqchip.pin;



		if (e->irqchip.pin >= KVM_IRQCHIP_NUM_PINS)

			goto out;

		break;

	case KVM_IRQ_ROUTING_MSI:

		e->set = kvm_set_msi;

		e->msi.address_lo = ue->u.msi.address_lo;

		e->msi.address_hi = ue->u.msi.address_hi;

		e->msi.data = ue->u.msi.data;

		break;

	default:

		goto out;

	}

	r = 0;

out:

	return r;

}



int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,

		struct kvm *kvm, int irq_source_id,

		int level, bool line_status)

{

	if (e->type == KVM_IRQ_ROUTING_MSI) {

		pch_msi_set_irq(kvm, e->msi.data, 1);

		return 0;

	}



	return -EWOULDBLOCK;

}



/**

 * kvm_set_msi: inject the MSI corresponding to the

 * MSI routing entry

 *

 * This is the entry point for irqfd MSI injection

 * and userspace MSI injection.

 */

int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,

		struct kvm *kvm, int irq_source_id,

		int level, bool line_status)

{

	if (!level)

		return -1;



	pch_msi_set_irq(kvm, e->msi.data, level);

	return 0;

}