Re: [PATCH RFC v2 6/6] KVM: introduce a new API for getting dirty bitmaps

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On 04/23/2010 03:59 PM, Alexander Graf wrote:

Ah so the 31st bit is optional as far as userspace is concerned?  What does it mean? (just curious)
The 0x80000000 bit declares that a pointer is in 24-bit mode, so that applications can use the spare upper bits for random data.

See for an explanation.

Interesting. Luckily AMD made the top 16 bits of pointers reserved in x86-64.

Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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