[Xen-devel] [PATCH] [HVM] Fix intra-vga-mem mmio in stdvga.c

["Trolle Selander" <trolle.selander@xxxxxxxxx>]

The current stdvga code never checks if the copy_from/to_guest calls fail, and thus silenty fails if both sides of an IOREQ_COPY points into mmio space. This patch fixes this and makes the code correctly handle intra-vga-mem copies, as well as log & turn off caching if some more "exotic" type of mmio (say, copy from vga mem to some other device's iomem), so that such mmio reqs will fall through to regular ioemu where they can hopefully be handled correctly.

In practice, this patch fixes a number of graphical glitches for guests running in standard vga mode, including a corrupted OS/2 boot graphic.

Signed-off-by: Trolle Selander <trolle.selander@xxxxxxxxxxxxx>

Attachment: xen_hvm_stdvga_fix.patch
Description: Text Data

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