Hi all, I'm studying the TPR access optimization in qemu-kvm for quite a while now. It's one of the, well, let's call it "hardest" parts of qemu-kvm I dealt with so far. But it's slowly getting clearer.
One thing I'm wondering now: This is practically targeting only 32-bit Windows, right? Already the assumption that we find a CPU index at fs:0x51 is apparently hard-coding this. Or that kernel code is at 0x8xxxxxxx or 0xExxxxxxx. But what makes sure that we aren't patching some other obscure OS that doesn't comply with our assumptions but triggers the TPR access reports nevertheless? Is there a way to detect the supported target OSes reliably before patching anything? Otherwise this feature has to remain off by default in upstream, I suppose. Jan
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