LoongArch: KVM: Check VM msgint feature during interrupt handling

During message interrupt handling and relative CSR registers saving and
restore, it is better to check VM msgint feature rather than host msgint
feature, because VM may disable this feature even if host supports this.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

Author: bibo-mao

arch/loongarch/include/asm/kvm_host.h

@@ -265,6 +265,11 @@ static inline void writel_sw_gcsr(struct loongarch_csrs *csr, int reg, unsigned
 	csr->csrs[reg] = val;
 }
 
+static inline bool kvm_guest_has_msgint(struct kvm_vcpu_arch *arch)
+{
+	return arch->cpucfg[1] & CPUCFG1_MSGINT;
+}
+
 static inline bool kvm_guest_has_fpu(struct kvm_vcpu_arch *arch)
 {
 	return arch->cpucfg[2] & CPUCFG2_FP;

arch/loongarch/kvm/interrupt.c

@@ -32,7 +32,7 @@ static int kvm_irq_deliver(struct kvm_vcpu *vcpu, unsigned int priority)
 	if (priority < EXCCODE_INT_NUM)
 		irq = priority_to_irq[priority];
 
-	if (cpu_has_msgint && (priority == INT_AVEC)) {
+	if (kvm_guest_has_msgint(&vcpu->arch) && (priority == INT_AVEC)) {
 		set_gcsr_estat(irq);
 		return 1;
 	}
@@ -64,7 +64,7 @@ static int kvm_irq_clear(struct kvm_vcpu *vcpu, unsigned int priority)
 	if (priority < EXCCODE_INT_NUM)
 		irq = priority_to_irq[priority];
 
-	if (cpu_has_msgint && (priority == INT_AVEC)) {
+	if (kvm_guest_has_msgint(&vcpu->arch) && (priority == INT_AVEC)) {
 		clear_gcsr_estat(irq);
 		return 1;
 	}

arch/loongarch/kvm/vcpu.c

@@ -1679,7 +1679,8 @@ static int _kvm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_DMWIN2);
 	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_DMWIN3);
 	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_LLBCTL);
-	if (cpu_has_msgint) {
+
+	if (kvm_guest_has_msgint(&vcpu->arch)) {
 		kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_ISR0);
 		kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_ISR1);
 		kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_ISR2);
@@ -1774,7 +1775,8 @@ static int _kvm_vcpu_put(struct kvm_vcpu *vcpu, int cpu)
 	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_DMWIN1);
 	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_DMWIN2);
 	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_DMWIN3);
-	if (cpu_has_msgint) {
+
+	if (kvm_guest_has_msgint(&vcpu->arch)) {
 		kvm_save_hw_gcsr(csr, LOONGARCH_CSR_ISR0);
 		kvm_save_hw_gcsr(csr, LOONGARCH_CSR_ISR1);
 		kvm_save_hw_gcsr(csr, LOONGARCH_CSR_ISR2);