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From: Wanpeng Li <>
Cc: "Paolo Bonzini" <>,
	"Radim Krčmář" <>,
	"Tonny Lu" <>
Subject: [PATCH] KVM: X86: Extend MAX_IRQ_ROUTES to 4096
Date: Thu, 19 Apr 2018 05:30:40 -0700	[thread overview]
Message-ID: <> (raw)

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,
In the future this might be extended if needed.

Cc: Paolo Bonzini <>
Cc: Radim Krčmář <>
Cc: Tonny Lu <>
Signed-off-by: Wanpeng Li <>
Signed-off-by: Tonny Lu <>
 include/linux/kvm_host.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 6930c63..815ae66 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1050,7 +1050,7 @@ static inline int mmu_notifier_retry(struct kvm *kvm, unsigned long mmu_seq)
 #elif defined(CONFIG_ARM64)
 #define KVM_MAX_IRQ_ROUTES 4096
-#define KVM_MAX_IRQ_ROUTES 1024
+#define KVM_MAX_IRQ_ROUTES 4096
 bool kvm_arch_can_set_irq_routing(struct kvm *kvm);

             reply	other threads:[~2018-04-19 12:31 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-19 12:30 Wanpeng Li [this message]
2018-04-19 13:06 ` Cornelia Huck
     [not found]   ` <>
2018-04-19 14:09     ` Cornelia Huck
2018-04-20  0:55       ` Wanpeng Li

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