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Message-Id: <20250806090046.2028785-3-maobibo@loongson.cn>
Date: Wed, 6 Aug 2025 17:00:45 +0800
From: Bibo Mao <maobibo@...ngson.cn>
To: Tianrui Zhao <zhaotianrui@...ngson.cn>,
Huacai Chen <chenhuacai@...nel.org>,
Xianglai Li <lixianglai@...ngson.cn>
Cc: kvm@...r.kernel.org,
loongarch@...ts.linux.dev,
linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/3] LoongArch: KVM: Add implementation with IOCSR_IPI_SET
IPI IOCSR register IOCSR_IPI_SET can send ipi interrupt to other vCPUs,
also it can send interrupt to vCPU itself. Instead there is such
operation on Linux such as arch_irq_work_raise(), it will send ipi
message to vCPU itself.
Here add implementation of write operation with IOCSR_IPI_SET register.
Signed-off-by: Bibo Mao <maobibo@...ngson.cn>
---
arch/loongarch/kvm/intc/ipi.c | 35 ++++++++++++++++++++---------------
1 file changed, 20 insertions(+), 15 deletions(-)
diff --git a/arch/loongarch/kvm/intc/ipi.c b/arch/loongarch/kvm/intc/ipi.c
index 6bbbf5df3957..d0457a198847 100644
--- a/arch/loongarch/kvm/intc/ipi.c
+++ b/arch/loongarch/kvm/intc/ipi.c
@@ -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)
@@ -241,7 +246,7 @@ 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 */
@@ -260,10 +265,10 @@ 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);
--
2.39.3
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