Kernel mode VGAs?

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Hello,

Current QEMU-KVM VGA implementation have the following problem with legacy OS (e.g. DOS with INT10h calls): Performance is low on accessing A000:0
page and doing bank switching at the 64k page.

Would a kernel mode VGA solve these problems?
How complicated is it?
Is it possible to have only some parts in kernel mode?
Any further ideas or suggestions?

Thnx.

Ciao,
Gerhard

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