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LoongArch: KVM: Add irqfd support

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Enable the KVM_IRQ_ROUTING/KVM_IRQCHIP/KVM_MSI configuration items,
add the KVM_CAP_IRQCHIP capability, and implement the query interface
of the in-kernel irqchip.

Signed-off-by: Xianglai Li <lixianglai@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Xianglai Li
2024-11-13 16:18:27 +08:00
committed by Huacai Chen
parent d206d95148
commit 1928254c5c
7 changed files with 146 additions and 1 deletions
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21
arch/loongarch/kvm/vm.c
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@@ -6,6 +6,8 @@
#include <linux/kvm_host.h>
#include <asm/kvm_mmu.h>
#include <asm/kvm_vcpu.h>
#include <asm/kvm_eiointc.h>
#include <asm/kvm_pch_pic.h>
const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
KVM_GENERIC_VM_STATS(),
@@ -76,6 +78,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
int r;
switch (ext) {
case KVM_CAP_IRQCHIP:
case KVM_CAP_ONE_REG:
case KVM_CAP_ENABLE_CAP:
case KVM_CAP_READONLY_MEM:
@@ -161,6 +164,8 @@ int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
struct kvm_device_attr attr;
switch (ioctl) {
case KVM_CREATE_IRQCHIP:
return 0;
case KVM_HAS_DEVICE_ATTR:
if (copy_from_user(&attr, argp, sizeof(attr)))
return -EFAULT;
@@ -170,3 +175,19 @@ int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
return -ENOIOCTLCMD;
}
}
int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_event, bool line_status)
{
if (!kvm_arch_irqchip_in_kernel(kvm))
return -ENXIO;
irq_event->status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID,
irq_event->irq, irq_event->level, line_status);
return 0;
}
bool kvm_arch_irqchip_in_kernel(struct kvm *kvm)
{
return (kvm->arch.ipi && kvm->arch.eiointc && kvm->arch.pch_pic);
}