https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203874
Bug ID: 203874
Summary: MSI/MSI-X interrupts don't work in VMware virtual
machines
Product: Base System
Version: 11.0-CURRENT
Hardware: amd64
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: bhav...@vmware.com
Any PCI* device/driver that relies on MSI or MSI-X interrupts doesn't work in a
VMware (ESXi hypervisor) virtual machine.
This is because of a quirk workaround that exists in the FreeBSD kernel that
fails requests for MSI or MSI-X interrupt vectors when it detects that the PCIe
Root Port or PCI bridge device is a VMware device (PCI Vendor ID 15adh, Device
ID 0790h or 07a0h)
The comment in the code suggests MSI/MSI-X didn't work in older versions of
ESXi:
sys/dev/pci/pci.c:
/*
* MSI-X allocation doesn't work properly for devices passed through
* by VMware up to at least ESXi 5.1.
*/
I don't think this is true any more. Verified this by booting with:
hw.pci.honor_msi_blacklist=0
in /boot/loader.conf
Everything seems to be working fine with various devices and drivers
(passthrough ixgbe/ixgbevf, vmxnet3, etc.) with this boot workaround in a
FreeBSD 10.2 VM on ESXi 6.0.
I'll propose a trivial patch to remove this quirk workaround.
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