tree ee4cfd5a3787c0da3c8e84519ace12cc83461cf6
parent 521ee0cfb876dd31ce4e0878e1163fe0817a7acc
author Heiko Carstens <heiko.carstens@de.ibm.com> 1384767355 +0100
committer Gleb Natapov <gleb@redhat.com> 1385025572 +0200

KVM: kvm_clear_guest_page(): fix empty_zero_page usage

Using the address of 'empty_zero_page' as source address in order to
clear a page is wrong. On some architectures empty_zero_page is only the
pointer to the struct page of the empty_zero_page.  Therefore the clear
page operation would copy the contents of a couple of struct pages instead
of clearing a page.  For kvm only arm/arm64 are affected by this bug.

To fix this use the ZERO_PAGE macro instead which will return the struct
page address of the empty_zero_page on all architectures.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>