[pve-devel] [PATCH docs] qm: add NOTE about PCID / CPU flags

[Fabian Grünbichler]

Signed-off-by: Fabian Grünbichler <f.gruenbichler at proxmox.com>
---
 qm.adoc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/qm.adoc b/qm.adoc
index e0d789c..95f1224 100644
--- a/qm.adoc
+++ b/qm.adoc
@@ -304,6 +304,12 @@ the kvm64 default. If you don’t care about live migration or have a homogeneou
 cluster where all nodes have the same CPU, set the CPU type to host, as in
 theory this will give your guests maximum performance.
 
+NOTE: If you're physical CPUs support the *PCID* (Process Context Identifier)
+feature, you can set the *flags* setting to `+pcid` in order to pass-through
+*PCID* support to the guest operating system. This allows the guest kernel to
+significantly reduce the performance impact of *KPTI* and similar *Meltdown*
+(*CVE-2017-5754*) mitigations.
+
 NUMA
 ^^^^
 You can also optionally emulate a *NUMA*
-- 
2.14.2