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

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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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3
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. */