Bug 1467887

Summary:	iommu platform support for ipxe
Product:	Red Hat Enterprise Linux 7	Reporter:	jason wang <jasowang>
Component:	ipxe	Assignee:	jason wang <jasowang>
ipxe sub component:	ipxe-roms	QA Contact:	FuXiangChun <xfu>
Status:	CLOSED ERRATA	Docs Contact:
Severity:	high
Priority:	high	CC:	ailan, chayang, hhan, jherrman, juzhang, libvirt-qe, michen, mtessun, wexu, xfu, yuma
Version:	7.4	Keywords:	ZStream
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	ipxe-20170123-2.git4e85b27.el7	Doc Type:	Bug Fix
Doc Text:	Previously, guest virtual machines that use the iPXE environment were not able to boot over a network if the Input/Output Memory Management Unit (IOMMU) mode was set for the virtio-net device. With this update, iPXE handles IOMMU setting correctly, and guests are able to boot properly in the described scenario.	Story Points:	---
Clone Of:
Clones:	1481180 (view as bug list)		Environment:
Last Closed:	2018-04-10 16:42:04 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	1481180

Description jason wang 2017-07-05 12:24:41 UTC

Description of problem:

We need claim the support for VIRTIO_F_IOMMU_PLATFORM, otherwise ipxe won't work if iommu is enabled for virtio-net.

Version-Release number of selected component (if applicable):


How reproducible:

100%

Steps to Reproduce:
1. enable iommu_platform for virtio-net
2. boot from network
3.

Actual results:

Can't get any nic in guest.

Expected results:

Works like a charm.

Additional info:

Comment 2 jason wang 2017-07-13 04:21:13 UTC

Patch accepted upstream.

Comment 6 Han Han 2017-08-10 09:08:31 UTC

(In reply to jason wang from comment #2)
> Patch accepted upstream.

Please provide the upstream patch link.

Comment 8 jason wang 2017-08-14 01:26:16 UTC

upstream commit: https://git.ipxe.org/ipxe.git/commit/6a258d8d5523c9b529ae2607d7f49e48eea8beeb

Comment 10 Miroslav Rezanina 2017-08-17 06:06:28 UTC

Fix included in ipxe-20170123-2.git4e85b27.el7

Comment 11 FuXiangChun 2017-08-24 08:49:02 UTC

Verified component version as below:

ipxe-roms-20170123-2.git4e85b27.el7.noarch
ipxe-roms-qemu-20170123-2.git4e85b27.el7.noarch
ipxe-bootimgs-20170123-2.git4e85b27.el7.noarch

3.10.0-704.el7.x86_64
qemu-kvm-rhev-2.9.0-16.el7.x86_64
seabios-1.10.2-3.el7.x86_64

steps:

1. Add "iommu=pt intel_iommu=on" to host kernel line

2. Add "intel_iommu=on" guest kernel line

3. qemu-kvm cmd:
/usr/libexec/qemu-kvm ....-device virtio-net-pci,netdev=hostnet1,id=net1,mac=52:54:00:7e:af:e6,iommu_platform=on,disable-modern=off,disable-legacy=on -netdev tap,id=hostnet1,vhost=on ....

Test result:

NIC works in guest.

Comment 13 FuXiangChun 2017-12-07 10:40:51 UTC

According to comment11, set this bug as verified status

Comment 16 errata-xmlrpc 2018-04-10 16:42:04 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:0918