[bionic/master-next,1/1] UBUNTU: SAUCE: kvm -- increase KVM_MAX_IRQ_ROUTES to 2048 on x86

Message ID 20180622192853.24305-2-apw@canonical.com
State New
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Series
  • [bionic/master-next,1/1] UBUNTU: SAUCE: kvm -- increase KVM_MAX_IRQ_ROUTES to 2048 on x86
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Commit Message

Andy Whitcroft June 22, 2018, 7:28 p.m.
Large KVM instances with a lot of devices may hit the kernel
KVM_MAX_IRQ_ROUTES limit.  Up the kernel limit to allow
these configurations to boot.  This has no effect on smaller
configurations.

BugLink: http://bugs.launchpad.net/bugs/1778261
Signed-off-by: Andy Whitcroft <apw@canonical.com>
---
 include/linux/kvm_host.h | 2 ++
 1 file changed, 2 insertions(+)

Patch

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 6bdd4b9f6611..68619a7b084c 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1049,6 +1049,8 @@  static inline int mmu_notifier_retry(struct kvm *kvm, unsigned long mmu_seq)
 #define KVM_MAX_IRQ_ROUTES 4096 //FIXME: we can have more than that...
 #elif defined(CONFIG_ARM64)
 #define KVM_MAX_IRQ_ROUTES 4096
+#elif defined(CONFIG_X86)
+#define KVM_MAX_IRQ_ROUTES 2048
 #else
 #define KVM_MAX_IRQ_ROUTES 1024
 #endif