[PATCH v1 4/5] util: add qemu_get_host_physmem utility function

["Alex Bennée" <alex.bennee@linaro.org>]

This will be used in a future patch. For POSIX systems _SC_PHYS_PAGES
isn't standardised but at least appears in the man pages for
Open/FreeBSD. The result is advisory so any users of it shouldn't just
fail if we can't work it out.

The win32 stub currently returns 0 until someone with a Windows system
can develop and test a patch.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Cc: BALATON Zoltan <balaton@eik.bme.hu>
Cc: Christian Ehrhardt <christian.ehrhardt@canonical.com>
---
 include/qemu/osdep.h | 10 ++++++++++
 util/oslib-posix.c   | 11 +++++++++++
 util/oslib-win32.c   |  6 ++++++
 3 files changed, 27 insertions(+)

diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
index 4841b5c6b5f..7ff209983e2 100644
--- a/include/qemu/osdep.h
+++ b/include/qemu/osdep.h
@@ -665,4 +665,14 @@ static inline void qemu_reset_optind(void)
  */
 char *qemu_get_host_name(Error **errp);
 
+/**
+ * qemu_get_host_physmem:
+ *
+ * Operating system agnostiv way of querying host memory.
+ *
+ * Returns amount of physical memory on the system. This is purely
+ * advisery and may return 0 if we can't work it out.
+ */
+size_t qemu_get_host_physmem(void);
+
 #endif
diff --git a/util/oslib-posix.c b/util/oslib-posix.c
index 36bf8593f8c..d9da782b896 100644
--- a/util/oslib-posix.c
+++ b/util/oslib-posix.c
@@ -839,3 +839,14 @@ char *qemu_get_host_name(Error **errp)
 
     return g_steal_pointer(&hostname);
 }
+
+size_t qemu_get_host_physmem(void)
+{
+#ifdef _SC_PHYS_PAGES
+    long pages = sysconf(_SC_PHYS_PAGES);
+    if (pages > 0) {
+        return pages * qemu_real_host_page_size;
+    }
+#endif
+    return 0;
+}
diff --git a/util/oslib-win32.c b/util/oslib-win32.c
index 7eedbe5859a..31030463cc9 100644
--- a/util/oslib-win32.c
+++ b/util/oslib-win32.c
@@ -828,3 +828,9 @@ char *qemu_get_host_name(Error **errp)
 
     return g_utf16_to_utf8(tmp, size, NULL, NULL, NULL);
 }
+
+size_t qemu_get_host_physmem(void)
+{
+    /* currently unimplemented */
+    return 0;
+}
-- 
2.20.1