New: scsi-block passthrough breaks with external pci-express SATA controller

https://bugzilla.kernel.org/show_bug.cgi?id=116611

Bug ID: 116611
Summary: scsi-block passthrough breaks with external
pci-express SATA controller
Product: Virtualization
Version: unspecified
Kernel Version: 4.4
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: kvm
Assignee: [email protected]
Reporter: [email protected]
Regression: No

My hardware provides 6 SATA ports directly from Intel Z97 chipset, and 2 additional SATA ports from a Marvell 88SE9172 attached to the Z97 PCI-e bus. A physical block device attached directly to the chipset ports can successfully be passed through using virtio-scsi-pci controller and scsi-block device to Windows 8/8.1/10 guest using qemu 2.5. However, attaching the same physical drive to the Marvell controller results in missing drives or weird/corrupted behavior in the guest when attempting to perform the same passthrough (for example, no hard drives are found during guest installation procedure after loading virtio drivers). This seems to have broken somewhere in 4.2 or later, as it works fine as expected in 4.1. The broken behavior appears in 4.4 and 4.5, though I have not been able to test 4.2 and 4.3.

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