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kvm: x86: default legacy PCI device assignment support to "n"

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VFIO has proved itself a much better option than KVM's built-in
device assignment.  It is mature, provides better isolation because
it enforces ACS, and even the userspace code is being tested on
a wider variety of hardware these days than the legacy support.

Disable legacy device assignment by default.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2015-06-04 09:51:50 +02:00
parent f71f81d70a
commit e194bbdf36
1 changed files with 4 additions and 3 deletions
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arch/x86/kvm/Kconfig
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@ -88,13 +88,14 @@ config KVM_MMU_AUDIT
config KVM_DEVICE_ASSIGNMENT
bool "KVM legacy PCI device assignment support"
depends on KVM && PCI && IOMMU_API
default y
default n
---help---
Provide support for legacy PCI device assignment through KVM. The
kernel now also supports a full featured userspace device driver
framework through VFIO, which supersedes much of this support.
framework through VFIO, which supersedes this support and provides
better security.
If unsure, say Y.
If unsure, say N.
# OK, it's a little counter-intuitive to do this, but it puts it neatly under
# the virtualization menu.