[PATCH V1 18/32] osdep: import MADV_DOEXEC

[Steve Sistare]

Anonymous memory segments used by the guest are preserved across a re-exec
of qemu, mapped at the same VA, via a proposed madvise(MADV_DOEXEC) option
in the Linux kernel. For the madvise patches, see:

https://lore.kernel.org/lkml/1595869887-23307-1-git-send-email-anthony.yznaga@oracle.com/

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
---
 include/qemu/osdep.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
index bb28df1..7ce555a 100644
--- a/include/qemu/osdep.h
+++ b/include/qemu/osdep.h
@@ -390,6 +390,11 @@ void qemu_anon_ram_free(void *ptr, size_t size);
 #else
 #define QEMU_MADV_REMOVE QEMU_MADV_INVALID
 #endif
+#ifdef MADV_DOEXEC
+#define QEMU_MADV_DOEXEC MADV_DOEXEC
+#else
+#define QEMU_MADV_DOEXEC QEMU_MADV_INVALID
+#endif
 
 #elif defined(CONFIG_POSIX_MADVISE)
 
@@ -403,6 +408,7 @@ void qemu_anon_ram_free(void *ptr, size_t size);
 #define QEMU_MADV_HUGEPAGE  QEMU_MADV_INVALID
 #define QEMU_MADV_NOHUGEPAGE  QEMU_MADV_INVALID
 #define QEMU_MADV_REMOVE QEMU_MADV_INVALID
+#define QEMU_MADV_DOEXEC  QEMU_MADV_INVALID
 
 #else /* no-op */
 
@@ -416,6 +422,7 @@ void qemu_anon_ram_free(void *ptr, size_t size);
 #define QEMU_MADV_HUGEPAGE  QEMU_MADV_INVALID
 #define QEMU_MADV_NOHUGEPAGE  QEMU_MADV_INVALID
 #define QEMU_MADV_REMOVE QEMU_MADV_INVALID
+#define QEMU_MADV_DOEXEC  QEMU_MADV_INVALID
 
 #endif
 
-- 
1.8.3.1