From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from firstgate.proxmox.com (firstgate.proxmox.com [212.224.123.68]) by lore.proxmox.com (Postfix) with ESMTPS id 2371E1FF162 for ; Fri, 26 Jul 2024 10:21:38 +0200 (CEST) Received: from firstgate.proxmox.com (localhost [127.0.0.1]) by firstgate.proxmox.com (Proxmox) with ESMTP id 936F31AB40; Fri, 26 Jul 2024 10:21:37 +0200 (CEST) From: Markus Frank To: pve-devel@lists.proxmox.com Date: Fri, 26 Jul 2024 10:21:12 +0200 Message-Id: <20240726082112.288403-1-m.frank@proxmox.com> X-Mailer: git-send-email 2.39.2 MIME-Version: 1.0 X-SPAM-LEVEL: Spam detection results: 0 AWL -0.024 Adjusted score from AWL reputation of From: address BAYES_00 -1.9 Bayes spam probability is 0 to 1% DMARC_MISSING 0.1 Missing DMARC policy KAM_DMARC_STATUS 0.01 Test Rule for DKIM or SPF Failure with Strict Alignment SPF_HELO_NONE 0.001 SPF: HELO does not publish an SPF Record SPF_PASS -0.001 SPF: sender matches SPF record URIBL_BLOCKED 0.001 ADMINISTRATOR NOTICE: The query to URIBL was blocked. See http://wiki.apache.org/spamassassin/DnsBlocklists#dnsbl-block for more information. [proxmox.com] Subject: [pve-devel] [PATCH docs] passthrough: viommu: replace host requirement with reference to pcie passthrough X-BeenThere: pve-devel@lists.proxmox.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: Proxmox VE development discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Proxmox VE development discussion Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: pve-devel-bounces@lists.proxmox.com Sender: "pve-devel" Enabling IOMMU on the host is not a requirement for vIOMMU. It is only a requirement for passthrough. Add a sentence to clarify the need for a configured PCI(e) passthrough on the host for passthrough to nested VMs. Suggested-by: Dominik Csapak Signed-off-by: Markus Frank --- This patch replaces the "[PATCH docs] passthrough: viommu: remove 'amd_iommu=on' from the docs" patch: https://lists.proxmox.com/pipermail/pve-devel/2024-April/063688.html qm-pci-passthrough.adoc | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) diff --git a/qm-pci-passthrough.adoc b/qm-pci-passthrough.adoc index bbd6b85..fd0872e 100644 --- a/qm-pci-passthrough.adoc +++ b/qm-pci-passthrough.adoc @@ -505,14 +505,12 @@ vIOMMU (emulated IOMMU) vIOMMU is the emulation of a hardware IOMMU within a virtual machine, providing improved memory access control and security for virtualized I/O devices. Using -the vIOMMU option also allows you to pass through PCI devices to level-2 VMs in -level-1 VMs via https://pve.proxmox.com/wiki/Nested_Virtualization[Nested Virtualization]. -There are currently two vIOMMU implementations available: Intel and VirtIO. - -Host requirement: +the vIOMMU option also allows you to pass through PCI(e) devices to level-2 VMs +in level-1 VMs via https://pve.proxmox.com/wiki/Nested_Virtualization[Nested Virtualization]. +To pass through physical PCI(e) devices from the host to nested VMs, follow the +PCI(e) passthrough instructions. -* Add `intel_iommu=on` or `amd_iommu=on` depending on your CPU to your kernel -command line. +There are currently two vIOMMU implementations available: Intel and VirtIO. Intel vIOMMU ^^^^^^^^^^^^ -- 2.39.2 _______________________________________________ pve-devel mailing list pve-devel@lists.proxmox.com https://lists.proxmox.com/cgi-bin/mailman/listinfo/pve-devel