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xen-devel
Re: [Xen-devel] [PATCH 2/2] x86: add pte_set_flags/clear_flags forptef
Jan Beulich wrote:
Whether a pte is live doesn't matter here: If you change P on Xen, the
frame number representation *must* change from/to PFN to/from MFN.
In no case (other than iomem pages) is it allowed to flip just this bit.
Yes, true. Same with _PAGE_SPECIAL, which is actually flipped by code
here. I guess a warning here might be useful, but really the calling
code needs to be properly disciplined; after all setting P on a swap
entry is no fun either.
J
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