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[Qemu-devel] [PULL 14/38] util: add fallback for qemu_memfd_alloc()
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] [PULL 14/38] util: add fallback for qemu_memfd_alloc() |
Date: |
Wed, 21 Oct 2015 13:27:16 +0300 |
From: Marc-André Lureau <address@hidden>
Add an open/unlink/mmap fallback for system that do not support
memfd (only available since 3.17, ~1y ago).
This patch may require additional SELinux policies to work for enforced
systems, but should fail gracefully in this case.
Signed-off-by: Marc-André Lureau <address@hidden>
Reviewed-by: Michael S. Tsirkin <address@hidden>
Signed-off-by: Michael S. Tsirkin <address@hidden>
Tested-by: Thibaut Collet <address@hidden>
---
util/memfd.c | 20 ++++++++++++++++++--
1 file changed, 18 insertions(+), 2 deletions(-)
diff --git a/util/memfd.c b/util/memfd.c
index c119483..4b23765 100644
--- a/util/memfd.c
+++ b/util/memfd.c
@@ -97,8 +97,24 @@ void *qemu_memfd_alloc(const char *name, size_t size,
unsigned int seals,
return NULL;
}
} else {
- perror("memfd");
- return NULL;
+ const char *tmpdir = g_get_tmp_dir();
+ gchar *fname;
+
+ fname = g_strdup_printf("%s/memfd-XXXXXX", tmpdir);
+ mfd = mkstemp(fname);
+ unlink(fname);
+ g_free(fname);
+
+ if (mfd == -1) {
+ perror("mkstemp");
+ return NULL;
+ }
+
+ if (ftruncate(mfd, size) == -1) {
+ perror("ftruncate");
+ close(mfd);
+ return NULL;
+ }
}
ptr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, mfd, 0);
--
MST
- [Qemu-devel] [PULL 04/38] tests: re-enable vhost-user-test, (continued)
- [Qemu-devel] [PULL 04/38] tests: re-enable vhost-user-test, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 06/38] pc-dimm: add vhost slots limit check before commiting to hotplug, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 07/38] vhost: fail backend intialization early, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 05/38] vhost: add vhost_has_free_slot() interface, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 08/38] virtio: add some migration doc, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 09/38] configure: probe for memfd, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 11/38] build-sys: split util-obj- on multi-lines, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 12/38] util: add linux-only memfd fallback, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 13/38] util: add memfd helpers, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 14/38] util: add fallback for qemu_memfd_alloc(),
Michael S. Tsirkin <=
- [Qemu-devel] [PULL 15/38] vhost: document log resizing, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 16/38] vhost: add vhost_set_log_base op, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 10/38] linux-headers: add unistd.h, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 17/38] vhost-user: add vhost_user_requires_shm_log(), Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 18/38] vhost: alloc shareable log, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 19/38] vhost-user: send log shm fd along with log_base, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 20/38] vhost-user: add a migration blocker, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 22/38] vhost-user: document migration log, Michael S. Tsirkin, 2015/10/21
- [Qemu-devel] [PULL 21/38] vhost: use a function for each call, Michael S. Tsirkin, 2015/10/21