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PointSav Digital Systems

PPN tenant VM isolation

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71c4a90c · PointSav Digital Systems ·

content(infrastructure): PPN cluster consolidation — merged the one genuine duplicate (pointsav-private-network.md into ppn-mesh-architecture.md; confirmed same subject/structure, plus fixed 2 real factual defects: wrong address range 10.50.0.0/24 vs the real 10.8.0.0/24, and a nonexistent route-network-admin name vs the real os-network-admin). The other 9 of 11 flagged articles confirmed legitimately complementary, not merged — audit's 'over-covered, fragmented' framing overstated the problem. Trimmed a duplicated architecture intro in ppn-tenant-vm-isolation.md and added a missing cross-link in sovereign-mesh.md, both per the verified draft plan. Updated infrastructure/_index.md MOC + redirects.yaml + aliases for wikilink resolution.

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@@ -10,7 +10,7 @@ status: active
audience: vendor-public
bcsc_class: public-disclosure-safe
language_protocol: PROSE-TOPIC
last_edited: 2026-07-11
last_edited: 2026-08-01
editor: pointsav-engineering
paired_with: ppn-tenant-vm-isolation.es.md
short_description: "The PPN resource pool separates tenant workloads through namespace isolation, per-VM process isolation, and user-mode networking; subnet isolation is a planned milestone."
@@ -18,17 +18,11 @@ forbidden_terms_cleared: true
cites: []
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The [[pointsav-private-network|PointSav Private Network]] (PPN) resource pool allows multiple tenants to run virtual machines on a shared set of physical and cloud nodes. This article describes the isolation model: what separation is provided, what is not, and the planned path to stronger network-level isolation.
The [[ppn-mesh-architecture|PointSav Private Network]] (PPN) resource pool allows multiple tenants to run virtual machines on a shared set of physical and cloud nodes. This article describes the isolation model: what separation is provided, what is not, and the planned path to stronger network-level isolation.

## The stack

Every virtual machine request passes through three layers before a QEMU process starts on a physical node:

- **[[service-vm-tenant|Tenant proxy]]** — authenticates the caller, enforces namespace and quota, and is the sole external entry point
- **[[service-vm-fleet|Fleet controller]]** — manages placement and delegates to the host agent; accepts connections only from the tenant proxy and internal mesh participants
- **Host agent** — spawns the QEMU process on the selected node; not reachable by external callers

A caller who has the fleet controller's address but not a valid tenant credential cannot reach the fleet controller directly — the authentication layer cannot be bypassed.
Every virtual machine request passes through the same three-service stack described in [[ppn-vm-resource-pool]] — [[service-vm-tenant|tenant proxy]], [[service-vm-fleet|fleet controller]], host agent — before a QEMU process starts on a physical node. This article covers what that stack does and does not guarantee about tenant isolation.

## What tenant isolation provides
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