From: Wanpeng Li <kernellwp@gmail.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: "Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"Tonny Lu" <tonnylu@tencent.com>
Subject: [PATCH] KVM: X86: Extend MAX_IRQ_ROUTES to 4096
Date: Thu, 19 Apr 2018 05:30:40 -0700 [thread overview]
Message-ID: <1524141040-50214-1-git-send-email-wanpengli@tencent.com> (raw)
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
next 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 ` [PATCH] KVM: X86: Extend MAX_IRQ_ROUTES to 4096 Cornelia Huck
[not found] ` <KL1PR02MB1301D3C3A62E6CED2530496180B50@KL1PR02MB1301.apcprd02.prod.outlook.com>
2018-04-19 14:09 ` Cornelia Huck
2018-04-20 0:55 ` Wanpeng Li
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