Commit 1cf7b288 authored by Bibo Mao's avatar Bibo Mao Committed by Huacai Chen
Browse files

LoongArch: KVM: Add implementation with IOCSR_IPI_SET 



IPI IOCSR register IOCSR_IPI_SET can send ipi interrupt to other vCPUs,
but it can also send an interrupt to vCPU itself. Indeed there are such
operations on Linux as arch_irq_work_raise() which will send ipi message
to vCPU itself.

Here add implementation of write operation with IOCSR_IPI_SET register.

Signed-off-by: default avatarBibo Mao <maobibo@loongson.cn>
Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent 44598fe7

arch/loongarch/kvm/intc/ipi.c

+20 −15
Original line number Diff line number Diff line
@@ -7,13 +7,26 @@ 
#include <asm/kvm_ipi.h>

#include <asm/kvm_vcpu.h>



static void ipi_send(struct kvm *kvm, uint64_t data)

static void ipi_set(struct kvm_vcpu *vcpu, uint32_t data)

{

	int cpu, action;

	uint32_t status;

	struct kvm_vcpu *vcpu;

	struct kvm_interrupt irq;



	spin_lock(&vcpu->arch.ipi_state.lock);

	status = vcpu->arch.ipi_state.status;

	vcpu->arch.ipi_state.status |= data;

	spin_unlock(&vcpu->arch.ipi_state.lock);

	if ((status == 0) && data) {

		irq.irq = LARCH_INT_IPI;

		kvm_vcpu_ioctl_interrupt(vcpu, &irq);

	}

}



static void ipi_send(struct kvm *kvm, uint64_t data)

{

	int cpu;

	struct kvm_vcpu *vcpu;



	cpu = ((data & 0xffffffff) >> 16) & 0x3ff;

	vcpu = kvm_get_vcpu_by_cpuid(kvm, cpu);

	if (unlikely(vcpu == NULL)) {
@@ -21,15 +34,7 @@ static void ipi_send(struct kvm *kvm, uint64_t data) 
		return;

	}



	action = BIT(data & 0x1f);

	spin_lock(&vcpu->arch.ipi_state.lock);

	status = vcpu->arch.ipi_state.status;

	vcpu->arch.ipi_state.status |= action;

	spin_unlock(&vcpu->arch.ipi_state.lock);

	if (status == 0) {

		irq.irq = LARCH_INT_IPI;

		kvm_vcpu_ioctl_interrupt(vcpu, &irq);

	}

	ipi_set(vcpu, BIT(data & 0x1f));

}



static void ipi_clear(struct kvm_vcpu *vcpu, uint64_t data)
@@ -231,7 +236,7 @@ static int loongarch_ipi_writel(struct kvm_vcpu *vcpu, gpa_t addr, int len, cons 
		spin_unlock(&vcpu->arch.ipi_state.lock);

		break;

	case IOCSR_IPI_SET:

		ret = -EINVAL;

		ipi_set(vcpu, data);

		break;

	case IOCSR_IPI_CLEAR:

		/* Just clear the status of the current vcpu */
@@ -250,10 +255,10 @@ static int loongarch_ipi_writel(struct kvm_vcpu *vcpu, gpa_t addr, int len, cons 
		ipi_send(vcpu->kvm, data);

		break;

	case IOCSR_MAIL_SEND:

		ret = mail_send(vcpu->kvm, *(uint64_t *)val);

		ret = mail_send(vcpu->kvm, data);

		break;

	case IOCSR_ANY_SEND:

		ret = any_send(vcpu->kvm, *(uint64_t *)val);

		ret = any_send(vcpu->kvm, data);

		break;

	default:

		kvm_err("%s: unknown addr: %llx\n", __func__, addr);