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Date:   Thu, 26 Apr 2018 17:55:03 -0700
From:   Wanpeng Li <>
Cc:     Paolo Bonzini <>,
        Radim Krčmář <>,
        Cornelia Huck <>,
        Christian Borntraeger <>,
        Tonny Lu <>
Subject: [PATCH v3] KVM: Extend MAX_IRQ_ROUTES to 4096 for all archs

From: Wanpeng Li <>

Our virtual machines make use of device assignment by configuring
12 NVMe disks for high I/O performance. Each NVMe device has 129 
MSI-X Table entries:
Capabilities: [50] MSI-X: Enable+ Count=129 Masked-Vector table: BAR=0 offset=00002000
The windows virtual machines fail to boot since they will map the number of 
MSI-table entries that the NVMe hardware reported to the bus to msi routing 
table, this will exceed the 1024. This patch extends MAX_IRQ_ROUTES to 4096
for all archs, in the future this might be extended again if needed.

Reviewed-by: Cornelia Huck <>
Cc: Paolo Bonzini <>
Cc: Radim Krčmář <>
Cc: Cornelia Huck <>
Cc: Christian Borntraeger <>
Signed-off-by: Wanpeng Li <>
Signed-off-by: Tonny Lu <>
v2 -> v3:
 * update comments in the code
v1 -> v2:
 * extend MAX_IRQ_ROUTES to 4096 for all archs 

 include/linux/kvm_host.h | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 6930c63..6d6e79c 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1045,13 +1045,7 @@ static inline int mmu_notifier_retry(struct kvm *kvm, unsigned long mmu_seq)
-#ifdef CONFIG_S390
-#define KVM_MAX_IRQ_ROUTES 4096 //FIXME: we can have more than that...
-#elif defined(CONFIG_ARM64)
-#define KVM_MAX_IRQ_ROUTES 4096
-#define KVM_MAX_IRQ_ROUTES 1024
+#define KVM_MAX_IRQ_ROUTES 4096 /* might need extension/rework in the future */
 bool kvm_arch_can_set_irq_routing(struct kvm *kvm);
 int kvm_set_irq_routing(struct kvm *kvm,

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