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LoongArch: KVM: Add DMSINTC inject msi to vCPU

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Implement irqfd that deliver msi to vCPU and vCPU dmsintc irq injection.
Add pch_msi_set_irq() choice dmsintc to set msi irq by the msg_addr and
implement dmsintc set msi irq.

Signed-off-by: Song Gao <gaosong@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Song Gao
2026-04-09 18:56:37 +08:00
committed by Huacai Chen
parent 229132c309
commit 03de5eecb0
6 changed files with 99 additions and 8 deletions
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74
arch/loongarch/kvm/intc/dmsintc.c
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@@ -4,9 +4,83 @@
*/
#include <linux/kvm_host.h>
#include <asm/kvm_csr.h>
#include <asm/kvm_dmsintc.h>
#include <asm/kvm_vcpu.h>
void dmsintc_inject_irq(struct kvm_vcpu *vcpu)
{
unsigned int i;
unsigned long vector[4], old;
struct dmsintc_state *ds = &vcpu->arch.dmsintc_state;
if (!ds)
return;
for (i = 0; i < 4; i++) {
old = atomic64_read(&(ds->vector_map[i]));
if (old)
vector[i] = atomic64_xchg(&(ds->vector_map[i]), 0);
}
if (vector[0]) {
old = kvm_read_hw_gcsr(LOONGARCH_CSR_ISR0);
kvm_write_hw_gcsr(LOONGARCH_CSR_ISR0, vector[0] | old);
}
if (vector[1]) {
old = kvm_read_hw_gcsr(LOONGARCH_CSR_ISR1);
kvm_write_hw_gcsr(LOONGARCH_CSR_ISR1, vector[1] | old);
}
if (vector[2]) {
old = kvm_read_hw_gcsr(LOONGARCH_CSR_ISR2);
kvm_write_hw_gcsr(LOONGARCH_CSR_ISR2, vector[2] | old);
}
if (vector[3]) {
old = kvm_read_hw_gcsr(LOONGARCH_CSR_ISR3);
kvm_write_hw_gcsr(LOONGARCH_CSR_ISR3, vector[3] | old);
}
}
int dmsintc_deliver_msi_to_vcpu(struct kvm *kvm,
struct kvm_vcpu *vcpu, u32 vector, int level)
{
struct kvm_interrupt vcpu_irq;
struct dmsintc_state *ds = &vcpu->arch.dmsintc_state;
if (!level)
return 0;
if (!vcpu || vector >= 256)
return -EINVAL;
if (!ds)
return -ENODEV;
vcpu_irq.irq = INT_AVEC;
set_bit(vector, (unsigned long *)&ds->vector_map);
kvm_vcpu_ioctl_interrupt(vcpu, &vcpu_irq);
kvm_vcpu_kick(vcpu);
return 0;
}
int dmsintc_set_irq(struct kvm *kvm, u64 addr, int data, int level)
{
unsigned int irq, cpu;
struct kvm_vcpu *vcpu;
irq = (addr >> AVEC_IRQ_SHIFT) & AVEC_IRQ_MASK;
cpu = (addr >> AVEC_CPU_SHIFT) & kvm->arch.dmsintc->cpu_mask;
if (cpu >= KVM_MAX_VCPUS)
return -EINVAL;
vcpu = kvm_get_vcpu_by_cpuid(kvm, cpu);
if (!vcpu)
return -EINVAL;
return dmsintc_deliver_msi_to_vcpu(kvm, vcpu, irq, level);
}
static int kvm_dmsintc_ctrl_access(struct kvm_device *dev,
struct kvm_device_attr *attr, bool is_write)
{