[Bug 110234] New: [Bug] guest i915 may guess the wrong PCH in virtual env

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110234

            Bug ID: 110234
           Summary: [Bug] guest i915 may guess the wrong PCH in virtual
                    env
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: trivial
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: xiong.y.zhang at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Currently guest i915 guess pch type according to processor type in virtual env.
As the real pch isn't in guest, but guest i915 need pch for some function, then
guest i915 has to guess the pch type. Normally this guess is right, but this
guess may be wrong in the following case:
1) ULT/ULX processor with non LP PCH
2) normal processor with LP pch

In order to fix it, the real pch id should be passed to guest, but there isn't
a standard way to do this. Hacker method is needed in QEMU and i915, and kinds
of hacker are rejected by QEMU.

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