[Xen-devel] [VTD] [PATCH] Ignore USB RMRR for HVM guest

["Han, Weidong" <weidong.han@xxxxxxxxx>]

USB controller RMRR (0xed000 - 0xeffff) conflicts with HVM guest bios
region. Setting identity mapping for it will cover the guest bios region
in p2m table. This causes system crash. 

As VT-d spec says, USB controller RMRR is used in case of DMA performed
by a USB controller under BIOS SMM control for legacy keyboard
emulation. Whereas, current guest BIOS doesn't support emulating
stardand
Keyboard/mouse, and it also doesn't support SMM mode. Actually it is no
chance to use USB controller RMRR now.

This patch ignores the USB controller RMRR for HVM guest.

Signed-off-by: Weidong Han <weidong.han@xxxxxxxxx>

Attachment: usb-rmrr.patch
Description: usb-rmrr.patch

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