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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:

Patch accepted upstream.

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

Please provide the upstream patch link.

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

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

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.

According to comment11, set this bug as verified status

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