drm/i915: Force VT'd workarounds when running as a guest OS

If i915.ko is being used as a passthrough device, it does not know if
the host is using intel_iommu. Mixing the iommu and gfx causes a few
issues (such as scanout overfetch) which we need to workaround inside
the driver, so if we detect we are running under a hypervisor, also
assume the device access is being virtualised.

Reported-by: Stefan Fritsch <[email protected]>
Suggested-by: Stefan Fritsch <[email protected]>
Signed-off-by: Chris Wilson <[email protected]>
Cc: Zhenyu Wang <[email protected]>
Cc: Joonas Lahtinen <[email protected]>
Cc: Stefan Fritsch <[email protected]>
Cc: [email protected]
Tested-by: Stefan Fritsch <[email protected]>
Reviewed-by: Zhenyu Wang <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
(cherry picked from commit f566fdcd6cc49a9d5b5d782f56e3e7cb243f01b8)
Signed-off-by: Rodrigo Vivi <[email protected]>

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