[kvm-unit-tests 2/5] lib: s390x: sie: Allocate physical guest memory via memalign

[Janosch Frank <frankja@linux.ibm.com>]

alloc_pages_flags() alignes the allocation on the same order as its
requested size. Since we use virtual memory for SIE we can instead
align to 1MB by using memalign() which is less wasteful.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 lib/s390x/sie.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/s390x/sie.c b/lib/s390x/sie.c
index a397400b..a49c45c7 100644
--- a/lib/s390x/sie.c
+++ b/lib/s390x/sie.c
@@ -171,7 +171,8 @@ uint8_t *sie_guest_alloc(uint64_t guest_size)
 	guest_virt = (uint8_t *)ALIGN(get_ram_size() + guest_counter * 4UL * SZ_1G, SZ_2G);
 	guest_counter++;
 
-	guest_phys = alloc_pages(get_order(guest_size) - 12);
+	guest_phys = memalign_pages_flags(SZ_1M, guest_size, 0);
+	assert(guest_phys);
 	/*
 	 * Establish a new mapping of the guest memory so it can be 2GB aligned
 	 * without actually requiring 2GB physical memory.
-- 
2.51.0