aboutsummaryrefslogtreecommitdiffstats
path: root/util/mmap-alloc.c
diff options
context:
space:
mode:
authorPeter Maydell <peter.maydell@linaro.org>2015-12-02 23:11:24 +0000
committerPeter Maydell <peter.maydell@linaro.org>2015-12-02 23:11:24 +0000
commitec1b9aa89d7970c7edc9594c33206690f5ba3c87 (patch)
tree91497fbe0db7bfabd0026de9a7ff0b0966c138ac /util/mmap-alloc.c
parentcf22132367a188426ac07cf1805b214dd2d0cc80 (diff)
parent7197fb4058bcb68986bae2bb2c04d6370f3e7218 (diff)
downloadqemu-ec1b9aa89d7970c7edc9594c33206690f5ba3c87.tar.gz
qemu-ec1b9aa89d7970c7edc9594c33206690f5ba3c87.tar.xz
qemu-ec1b9aa89d7970c7edc9594c33206690f5ba3c87.zip
Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging
virtio,vhost,mmap fixes for 2.5 vhost test patches to fix the travis build virtio ccw patch to fix virtio 1 virtio pci patch to fix pci express vhost user bridge patch to fix fd leaks mmap-alloc patch to fix hugetlbfs on ppc64 remove dead code for vhost (trivial) Signed-off-by: Michael S. Tsirkin <mst@redhat.com> # gpg: Signature made Wed 02 Dec 2015 20:38:41 GMT using RSA key ID D28D5469 # gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>" # gpg: aka "Michael S. Tsirkin <mst@redhat.com>" * remotes/mst/tags/for_upstream: util/mmap-alloc: fix hugetlb support on ppc64 virtio-pci: Set the QEMU_PCI_CAP_EXPRESS capability early in its DeviceClass realize method virtio: handle non-virtio-1-capable backend for ccw tests/vhost-user-bridge.c: fix fd leakage vhost: drop dead code vhost-user: verify that number of queues is non-zero vhost-user-test: fix crash with glib < 2.36 vhost-user-test: use unix port for migration vhost-user-test: fix chardriver race Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'util/mmap-alloc.c')
-rw-r--r--util/mmap-alloc.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/util/mmap-alloc.c b/util/mmap-alloc.c
index c37acbe58..54793a5dc 100644
--- a/util/mmap-alloc.c
+++ b/util/mmap-alloc.c
@@ -14,6 +14,32 @@
#include <sys/mman.h>
#include <assert.h>
+#define HUGETLBFS_MAGIC 0x958458f6
+
+#ifdef CONFIG_LINUX
+#include <sys/vfs.h>
+#endif
+
+size_t qemu_fd_getpagesize(int fd)
+{
+#ifdef CONFIG_LINUX
+ struct statfs fs;
+ int ret;
+
+ if (fd != -1) {
+ do {
+ ret = fstatfs(fd, &fs);
+ } while (ret != 0 && errno == EINTR);
+
+ if (ret == 0 && fs.f_type == HUGETLBFS_MAGIC) {
+ return fs.f_bsize;
+ }
+ }
+#endif
+
+ return getpagesize();
+}
+
void *qemu_ram_mmap(int fd, size_t size, size_t align, bool shared)
{
/*
@@ -21,7 +47,20 @@ void *qemu_ram_mmap(int fd, size_t size, size_t align, bool shared)
* space, even if size is already aligned.
*/
size_t total = size + align;
+#if defined(__powerpc64__) && defined(__linux__)
+ /* On ppc64 mappings in the same segment (aka slice) must share the same
+ * page size. Since we will be re-allocating part of this segment
+ * from the supplied fd, we should make sure to use the same page size,
+ * unless we are using the system page size, in which case anonymous memory
+ * is OK. Use align as a hint for the page size.
+ * In this case, set MAP_NORESERVE to avoid allocating backing store memory.
+ */
+ int anonfd = fd == -1 || qemu_fd_getpagesize(fd) == getpagesize() ? -1 : fd;
+ int flags = anonfd == -1 ? MAP_ANONYMOUS : MAP_NORESERVE;
+ void *ptr = mmap(0, total, PROT_NONE, flags | MAP_PRIVATE, anonfd, 0);
+#else
void *ptr = mmap(0, total, PROT_NONE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+#endif
size_t offset = QEMU_ALIGN_UP((uintptr_t)ptr, align) - (uintptr_t)ptr;
void *ptr1;