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-rw-r--r--content/docs/user_guide/platforms.md5
1 files changed, 5 insertions, 0 deletions
diff --git a/content/docs/user_guide/platforms.md b/content/docs/user_guide/platforms.md
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--- a/content/docs/user_guide/platforms.md
+++ b/content/docs/user_guide/platforms.md
@@ -63,6 +63,11 @@ nested virtualization in several popular environments:
* VirtualBox: [Nested Virtualization][nested-virtualbox]
* KVM: [Nested Guests][nested-kvm]
+***Note: nested virtualization will have poor performance and is historically a
+cause of security issues (e.g.
+[CVE-2018-12904](https://nvd.nist.gov/vuln/detail/CVE-2018-12904)). It is not
+recommended for production.***
+
### Configuring Docker
Per above, you will need to configure Docker to use `runsc` with the KVM