On 1/21/21 10:46 AM, Janosch Frank wrote:
On 1/21/21 10:13 AM, Pierre Morel wrote:
To centralize the memory allocation for I/O we define
the alloc_io_page/free_io_page functions which share the I/O
memory with the host in case the guest runs with
protected virtualization.
Signed-off-by: Pierre Morel <pmorel@xxxxxxxxxxxxx>
---
MAINTAINERS | 1 +
lib/s390x/malloc_io.c | 70 +++++++++++++++++++++++++++++++++++++++++++
lib/s390x/malloc_io.h | 45 ++++++++++++++++++++++++++++
s390x/Makefile | 1 +
4 files changed, 117 insertions(+)
create mode 100644 lib/s390x/malloc_io.c
create mode 100644 lib/s390x/malloc_io.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 54124f6..89cb01e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -82,6 +82,7 @@ M: Thomas Huth <thuth@xxxxxxxxxx>
M: David Hildenbrand <david@xxxxxxxxxx>
M: Janosch Frank <frankja@xxxxxxxxxxxxx>
R: Cornelia Huck <cohuck@xxxxxxxxxx>
+R: Pierre Morel <pmorel@xxxxxxxxxxxxx>
If you're ok with the amount of mails you'll get then go ahead.
But I think maintainer file changes should always be in a separate patch.
You are right it was more an attempts to bring the Linux checkpatch to
be quiet but this would need more changes so.. we can discuss this in a
separate patch.
L: kvm@xxxxxxxxxxxxxxx
L: linux-s390@xxxxxxxxxxxxxxx
F: s390x/*
diff --git a/lib/s390x/malloc_io.c b/lib/s390x/malloc_io.c
new file mode 100644
index 0000000..bfe8c6a
--- /dev/null
+++ b/lib/s390x/malloc_io.c
@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: GPL-2.0
I think we wanted to use:
/* SPDX-License-Identifier: GPL-2.0-or-later */
yes
...snip...
+
+void free_io_pages(void *p, int size)
+{
+ int order = size >> PAGE_SHIFT;
+
+ assert(IS_ALIGNED((uintptr_t)p, PAGE_SIZE));
+
+ if (test_facility(158))
+ unshare_pages(p, 1 << order);
I have a lib file in the making that will let you check UV features like
test_facility(). When that's ready I'm gonna check for unshare here.
OK
Thanks,
Pierre
--
Pierre Morel
IBM Lab Boeblingen
