lkml.org 
[lkml]   [2018]   [Apr]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] KVM: X86: Extend MAX_IRQ_ROUTES to 4096
Date
From: Wanpeng Li <wanpengli@tencent.com>

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 <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Tonny Lu <tonnylu@tencent.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Signed-off-by: Tonny Lu <tonnylu@tencent.com>
---
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
#else
-#define KVM_MAX_IRQ_ROUTES 1024
+#define KVM_MAX_IRQ_ROUTES 4096
#endif

bool kvm_arch_can_set_irq_routing(struct kvm *kvm);
--
2.7.4
\
 
 \ /
  Last update: 2018-04-19 14:32    [W:0.884 / U:0.000 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site