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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).

Backports commit 0c1272cc7c72dfe0ef66be8f283cf67c74b58586 from qemu
This commit is contained in:
Nicholas Piggin 2018-06-15 11:53:45 -04:00 committed by Lioncash
parent d4ad9e37a2
commit 1a9d9e3547
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 2 additions and 1 deletions
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qemu/util/oslib-posix.c
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@ -27,7 +27,8 @@
*/ */
#if defined(__linux__) && \ #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. /* Use 2 MiB alignment so transparent hugepages can be used by KVM.
Valgrind does not support alignments larger than 1 MiB, Valgrind does not support alignments larger than 1 MiB,
therefore we need special code which handles running on Valgrind. */ therefore we need special code which handles running on Valgrind. */