Public bug reported:
[Impact]
With ubuntu 14.04 , install Xen 4.4 hypervisor and create VM (guset OS)
with 14.04. Then let the NMEe
SSD passthough in guest OS. NVMe SSD MSI-x use wrong number of
interrupts and can't recive any
interrupts by FIO test.
[Test Case]
1. NVMe driver load in Guest OS ,do FIO test with NVME0n1.
2. "cat /proc/interrupt | grep nvme" shows 21 MSI-X interrupts but VCPU
is only 10.
3. When FIO test is made ,the MSI-X interrupts is not increasing. IOPS
is unstable , it is jumping
change.
4. unload NVMe driver,and insmod it again, dmesg show "Xen PCI frontend
has not registered MSI/MSI-X
support" . "cat /proc/interrupt | grep nvme" shows only 1 xen pirq ioapic
interrupt.
[Regression Potential]
no
[Other Info]
no
** Affects: qemu (Ubuntu)
Importance: Undecided
Status: New
** Patch added: "Dmesg info of Guest OS"
https://bugs.launchpad.net/bugs/1703280/+attachment/4911998/+files/log.zip
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https://bugs.launchpad.net/bugs/1703280
Title:
Xen MSI-x do not receive interrupt
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