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osdep: powerpc64 align memory to allow 2MB radix THP page tables 

This allows KVM with the Book3S radix MMU mode to take advantage of
THP and install larger pages in the partition scope page tables (the
host translation).

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Nicholas Piggin 2018-05-06 17:29:49 +10:00 committed by David Gibson
parent efe2add7cb
commit 0c1272cc7c
1 changed files with 2 additions and 1 deletions
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include/qemu/osdep.h
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@ -367,7 +367,8 @@ void qemu_anon_ram_free(void *ptr, size_t size);
#endif
#if defined(__linux__) && \
(defined(__x86_64__) || defined(__arm__) || defined(__aarch64__))
(defined(__x86_64__) || defined(__arm__) || defined(__aarch64__) \
|| defined(__powerpc64__))
/* Use 2 MiB alignment so transparent hugepages can be used by KVM.
Valgrind does not support alignments larger than 1 MiB,
therefore we need special code which handles running on Valgrind. */