[Bug 197951] New: QEMU/KVM & VFIO & PCI passthru with Windows 10 x64 guest: memory access intermittently causes CRITICAL_STRUCTURE_CORRUPTION BSOD unless swap is disabled on host, since 4.12.13

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https://bugzilla.kernel.org/show_bug.cgi?id=197951

            Bug ID: 197951
           Summary: QEMU/KVM & VFIO & PCI passthru with Windows 10 x64
                    guest: memory access intermittently causes
                    CRITICAL_STRUCTURE_CORRUPTION BSOD unless swap is
                    disabled on host, since 4.12.13
           Product: Virtualization
           Version: unspecified
    Kernel Version: 4.12.13
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: kvm
          Assignee: virtualization_kvm@kernel-bugs.osdl.org
          Reporter: JimiJames.Bove@gmail.com
        Regression: No

Originally reported here: https://bugs.launchpad.net/qemu/+bug/1728256

The title explains it all. When running a Windows 10 x64 guest that passes
through a PCIe device with VFIO (especially a GPU, or perhaps only if at least
one passed device is a GPU, since nobody who isn't passing through a GPU has
confirmed this) on kernel version 4.12.13 and up, the guest will crash with the
CRITICAL_STRUCTURE_CORRUPTION blue screen of death randomly when accessing the
host's memory. You have to be doing something memory intensive, like mining or
gaming, for it to happen often enough to really notice, but if you do, it
happens once an hour or every few hours.

I downgraded to 4.12.12 and the issue went away. Others disabled swap instead
of downgrading, and the issue went away. Disabling swap isn't an option for me,
so I can't upgrade the kernel until this is fixed.

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