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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>,
	"Cornelia Huck" <cohuck@redhat.com>
Subject: [PATCH v2] KVM: Extend MAX_IRQ_ROUTES to 4096 for all archs
Date: Thu, 19 Apr 2018 17:47:28 -0700	[thread overview]
Message-ID: <1524185248-51744-1-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
for all archs, in the future this might be extended again if needed.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Tonny Lu <tonnylu@tencent.com>
Cc: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Signed-off-by: Tonny Lu <tonnylu@tencent.com>
---
v1 -> v2:
 * extend MAX_IRQ_ROUTES to 4096 for all archs 

 include/linux/kvm_host.h | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 6930c63..0a5c299 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_HAVE_KVM_IRQ_ROUTING
 
-#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
-#else
-#define KVM_MAX_IRQ_ROUTES 1024
-#endif
 
 bool kvm_arch_can_set_irq_routing(struct kvm *kvm);
 int kvm_set_irq_routing(struct kvm *kvm,
-- 
2.7.4

             reply	other threads:[~2018-04-20  0:48 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-20  0:47 Wanpeng Li [this message]
2018-04-20  7:15 ` Cornelia Huck
2018-04-20 13:51   ` Wanpeng Li
2018-04-20 14:21     ` Cornelia Huck
2018-04-21  0:38       ` Wanpeng Li
2018-04-23 11:50         ` Christian Borntraeger
2018-04-23 11:56           ` Wanpeng Li
2018-04-23 11:57           ` Cornelia Huck

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