s390: autodetect map private

[qemu.git] / oslib-posix.c

diff --git a/oslib-posix.c b/oslib-posix.c
index 6b7ba646c7bd30ab193b81f7e3f5be5dd6d43712..dbeb6272b8d03dddf14955c6ec85b1837bcda433 100644 (file)
--- a/oslib-posix.c
+++ b/oslib-posix.c
@@ -41,6 +41,9 @@ extern int daemon(int, int);
       therefore we need special code which handles running on Valgrind. */
 #  define QEMU_VMALLOC_ALIGN (512 * 4096)
 #  define CONFIG_VALGRIND
+#elif defined(__linux__) && defined(__s390x__)
+   /* Use 1 MiB (segment size) alignment so gmap can be used by KVM. */
+#  define QEMU_VMALLOC_ALIGN (256 * 4096)
 #else
 #  define QEMU_VMALLOC_ALIGN getpagesize()
 #endif