From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:55038) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fYVFo-00023o-IR for qemu-devel@nongnu.org; Thu, 28 Jun 2018 07:38:25 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fYVFn-0008OT-OX for qemu-devel@nongnu.org; Thu, 28 Jun 2018 07:38:24 -0400 From: David Hildenbrand Date: Thu, 28 Jun 2018 13:38:17 +0200 Message-Id: <20180628113817.30814-3-david@redhat.com> In-Reply-To: <20180628113817.30814-1-david@redhat.com> References: <20180628113817.30814-1-david@redhat.com> Subject: [Qemu-devel] [PATCH v1 2/2] s390x/kvm: indicate alignment in legacy_s390_alloc() List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-s390x@nongnu.org Cc: qemu-devel@nongnu.org, Richard Henderson , Alexander Graf , Cornelia Huck , Christian Borntraeger , Thomas Huth , David Hildenbrand Let's do this for completeness reason, although we don't support e.g. PCDIMM/NVDIMM, which would use the alignment for placing the memory region in guest physical memory. But maybe someday we would want to support something like this - then we don't forget about this if allowing multiple allocations in legacy_s390_alloc(). Use the same alignment as we would set in qemu_anon_ram_alloc(). Our fixed address satisfies this alignment (1MB). This implicitly sets the alignment of the underlying memory region. Signed-off-by: David Hildenbrand --- target/s390x/kvm.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c index bbac3454e3..22e13080a5 100644 --- a/target/s390x/kvm.c +++ b/target/s390x/kvm.c @@ -765,6 +765,9 @@ static void *legacy_s390_alloc(size_t size, uint64_t *align, bool shared) if (mem == MAP_FAILED) { mem = NULL; } + if (mem && align) { + *align = QEMU_VMALLOC_ALIGN; + } return mem; } -- 2.17.1