linux-kernel - [PATCH v2 4/4] LongArch: KVM: Add dintc inject msi to the dest vcpu

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20251128091125.2720148-5-gaosong@loongson.cn>
Date: Fri, 28 Nov 2025 17:11:25 +0800
From: Song Gao <gaosong@...ngson.cn>
To: maobibo@...ngson.cn,
	chenhuacai@...nel.org
Cc: kvm@...r.kernel.org,
	loongarch@...ts.linux.dev,
	kernel@...0n.name,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 4/4] LongArch: KVM: Add dintc inject msi to the dest vcpu

Implement irqfd deliver msi to vcpu and
vcpu dintc inject irq.

Signed-off-by: Song Gao <gaosong@...ngson.cn>
---
 arch/loongarch/include/asm/kvm_host.h |  5 +++
 arch/loongarch/kvm/interrupt.c        |  1 +
 arch/loongarch/kvm/vcpu.c             | 55 +++++++++++++++++++++++++++
 3 files changed, 61 insertions(+)

diff --git a/arch/loongarch/include/asm/kvm_host.h b/arch/loongarch/include/asm/kvm_host.h
index 7f6c4e7d241e..298e4b7c3769 100644
--- a/arch/loongarch/include/asm/kvm_host.h
+++ b/arch/loongarch/include/asm/kvm_host.h
@@ -256,6 +256,11 @@ struct kvm_vcpu_arch {
 	} st;
 };
 
+void loongarch_dintc_inject_irq(struct kvm_vcpu *vcpu);
+int kvm_loongarch_deliver_msi_to_vcpu(struct kvm *kvm,
+				struct kvm_vcpu *vcpu,
+				u32 vector, int level);
+
 static inline unsigned long readl_sw_gcsr(struct loongarch_csrs *csr, int reg)
 {
 	return csr->csrs[reg];
diff --git a/arch/loongarch/kvm/interrupt.c b/arch/loongarch/kvm/interrupt.c
index a6d42d399a59..c74e7af3e772 100644
--- a/arch/loongarch/kvm/interrupt.c
+++ b/arch/loongarch/kvm/interrupt.c
@@ -33,6 +33,7 @@ static int kvm_irq_deliver(struct kvm_vcpu *vcpu, unsigned int priority)
 		irq = priority_to_irq[priority];
 
 	if (cpu_has_msgint && (priority == INT_AVEC)) {
+		loongarch_dintc_inject_irq(vcpu);
 		set_gcsr_estat(irq);
 		return 1;
 	}
diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index 1e7590fc1b47..84cf8b7c67dd 100644
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -13,6 +13,61 @@
 #define CREATE_TRACE_POINTS
 #include "trace.h"
 
+void loongarch_dintc_inject_irq(struct kvm_vcpu *vcpu)
+{
+	struct dintc_state *ds = &vcpu->arch.dintc_state;
+	unsigned int i;
+	unsigned long temp[4], old;
+
+	if (!ds)
+		return;
+
+	for (i = 0; i < 4; i++) {
+		old = atomic64_read(&(ds->vector_map[i]));
+		if (old)
+			temp[i] = atomic64_xchg(&(ds->vector_map[i]), 0);
+	}
+
+	if (temp[0]) {
+		old = kvm_read_hw_gcsr(LOONGARCH_CSR_ISR0);
+		kvm_write_hw_gcsr(LOONGARCH_CSR_ISR0, temp[0]|old);
+	}
+	if (temp[1]) {
+		old = kvm_read_hw_gcsr(LOONGARCH_CSR_ISR1);
+		kvm_write_hw_gcsr(LOONGARCH_CSR_ISR1, temp[1]|old);
+	}
+	if (temp[2]) {
+		old = kvm_read_hw_gcsr(LOONGARCH_CSR_ISR2);
+		kvm_write_hw_gcsr(LOONGARCH_CSR_ISR2, temp[2]|old);
+	}
+	if (temp[3]) {
+		old = kvm_read_hw_gcsr(LOONGARCH_CSR_ISR3);
+		kvm_write_hw_gcsr(LOONGARCH_CSR_ISR3, temp[3]|old);
+	}
+}
+
+int kvm_loongarch_deliver_msi_to_vcpu(struct kvm *kvm,
+				struct kvm_vcpu *vcpu,
+				u32 vector, int level)
+{
+	struct kvm_interrupt vcpu_irq;
+	struct dintc_state *ds;
+
+	if (!level)
+		return 0;
+	if (!vcpu || vector >= 256)
+		return -EINVAL;
+	ds = &vcpu->arch.dintc_state;
+	if (!ds)
+		return -ENODEV;
+	set_bit(vector, (unsigned long *)&ds->vector_map);
+	vcpu_irq.irq = INT_AVEC;
+	kvm_vcpu_ioctl_interrupt(vcpu, &vcpu_irq);
+	kvm_vcpu_kick(vcpu);
+	return 0;
+}
+
+
 const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
 	KVM_GENERIC_VCPU_STATS(),
 	STATS_DESC_COUNTER(VCPU, int_exits),
-- 
2.39.3