linux-kernel - [PATCH] kvm/x86 : set meaningful return value

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Date:   Fri, 28 Sep 2018 12:41:53 -0400
From:   Peng Hao <penghao122@...a.com.cn>
To:     pbonzini@...hat.com, rkrcmar@...hat.com, tglx@...utronix.de,
        mingo@...hat.com, hpa@...or.com
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org, x86@...nel.org,
        Peng Hao <peng.hao2@....com.cn>
Subject: [PATCH]  kvm/x86 : set meaningful return value


From: Peng Hao <peng.hao2@....com.cn>

kvm_irq_delivery_to_apic_fast()-->
    kvm_apic_map_get_dest_lapic()-->
        kvm_apic_disabled_lapic_found()
kvm_apic_map_get_dest_lapic return with bitmap==0 and dst[i]==NULL,
then (*r == -1) will be returned to qemu and "KVM: injection failed,
MSI lost(Operation not permitted)" will be recorded in qemu log. The
output is puzzling.

Signed-off-by: Peng Hao <peng.hao2@....com.cn>
---
 arch/x86/kvm/lapic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index fbb0e6d..a8896b3 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -944,7 +944,7 @@ bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src,
 	int i;
 	bool ret;
 
-	*r = -1;
+	*r = -ENXIO;
 
 	if (irq->shorthand == APIC_DEST_SELF) {
 		*r = kvm_apic_set_irq(src->vcpu, irq, dest_map);
-- 
1.8.3.1