xen/mm: zero PTEs for non-present MFNs in the initial page table

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When constructing the initial page tables, if the MFN for a usable PFN
is missing in the p2m then that frame is initially ballooned out.  In
this case, zero the PTE (as in decrease_reservation() in
drivers/xen/balloon.c).

This is obviously safe instead of having an valid PTE with an MFN of
INVALID_P2M_ENTRY (~0).

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

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David Vrabel 2012-07-09 11:39:06 +01:00 • committed by Konrad Rzeszutek Wilk

parent d095d43e78

commit 66a27dde9a

1 changed files with 8 additions and 1 deletions

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arch/x86/xen/mmu.c

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