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KVM: Enable MSI for device assignment

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We enable guest MSI and host MSI support in this patch. The userspace want to
enable MSI should set KVM_DEV_IRQ_ASSIGN_ENABLE_MSI in the assigned_irq's flag.
Function would return -ENOTTY if can't enable MSI, userspace shouldn't set MSI
Enable bit when KVM_ASSIGN_IRQ return -ENOTTY with
KVM_DEV_IRQ_ASSIGN_ENABLE_MSI.

Userspace can tell the support of MSI device from #ifdef KVM_CAP_DEVICE_MSI.

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Sheng Yang 2008-11-24 14:32:56 +08:00 • committed by Avi Kivity
parent f64769eb05
commit 6b9cc7fd46
2 changed files with 78 additions and 6 deletions
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3
include/linux/kvm.h
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@ -392,6 +392,9 @@ struct kvm_trace_rec {
#endif
#define KVM_CAP_IOMMU 18
#define KVM_CAP_NMI 19
#if defined(CONFIG_X86)
#define KVM_CAP_DEVICE_MSI 20
#endif
/*
* ioctls for VM fds