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27 March 2024, 02:37:15 UTC
Revision 5d4e08c45a6cf8f1ab3c7fa375007635ac569165 authored by Mark Salter on 28 March 2014, 14:25:19 UTC, committed by Christoffer Dall on 28 April 2014, 10:21:48 UTC 
arm: KVM: fix possible misalignment of PGDs and bounce page
 
The kvm/mmu code shared by arm and arm64 uses kalloc() to allocate
a bounce page (if hypervisor init code crosses page boundary) and
hypervisor PGDs. The problem is that kalloc() does not guarantee
the proper alignment. In the case of the bounce page, the page sized
buffer allocated may also cross a page boundary negating the purpose
and leading to a hang during kvm initialization. Likewise the PGDs
allocated may not meet the minimum alignment requirements of the
underlying MMU. This patch uses __get_free_page() to guarantee the
worst case alignment needs of the bounce page and PGDs on both arm
and arm64.

Cc: <stable@vger.kernel.org> # 3.10+
Signed-off-by: Mark Salter <msalter@redhat.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
1 parent 4e4468f
History
Tip revision: 5d4e08c45a6cf8f1ab3c7fa375007635ac569165 authored by Mark Salter on 28 March 2014, 14:25:19 UTC
arm: KVM: fix possible misalignment of PGDs and bounce page
Tip revision: 5d4e08c
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