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authorTakuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>2011-05-07 16:31:36 +0900
committerAvi Kivity <avi@redhat.com>2011-05-22 08:47:54 -0400
commit12cb814f3bb35736420cc6bfc9fed7b6a9d3a828 (patch)
tree86371ff3cc2a2e9e08211cd20c464b8efbabb1d6 /virt
parent5ce941ee4258b836cf818d2ac159d8cf3ebad648 (diff)
downloadvexpress-lsk-12cb814f3bb35736420cc6bfc9fed7b6a9d3a828.tar.gz
KVM: MMU: Clean up gpte reading with copy_from_user()
When we optimized walk_addr_generic() by not using the generic guest memory reader, we replaced copy_from_user() with get_user(): commit e30d2a170506830d5eef5e9d7990c5aedf1b0a51 KVM: MMU: Optimize guest page table walk commit 15e2ac9a43d4d7d08088e404fddf2533a8e7d52e KVM: MMU: Fix 64-bit paging breakage on x86_32 But as Andi pointed out later, copy_from_user() does the same as get_user() as long as we give a constant size to it. So we use copy_from_user() to clean up the code. The only, noticeable, regression introduced by this is 64-bit gpte reading on x86_32 hosts needed for PAE guests. But this can be mitigated by implementing 8-byte get_user() for x86_32, if needed. Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp> Signed-off-by: Avi Kivity <avi@redhat.com>
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