1 files changed, 20 insertions, 0 deletions
diff --git a/linux-user/x86_64/elfload.c b/linux-user/x86_64/elfload.c
index 12de1c54c7..1e7000c6bc 100644
--- a/linux-user/x86_64/elfload.c
+++ b/linux-user/x86_64/elfload.c
@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-or-later */
 
 #include "qemu/osdep.h"
+#include "qemu/error-report.h"
 #include "qemu.h"
 #include "loader.h"
 #include "target_elf.h"
@@ -21,6 +22,25 @@ const char *get_elf_platform(CPUState *cs)
     return "x86_64";
 }
 
+bool init_guest_commpage(void)
+{
+    /*
+     * The vsyscall page is at a high negative address aka kernel space,
+     * which means that we cannot actually allocate it with target_mmap.
+     * We still should be able to use page_set_flags, unless the user
+     * has specified -R reserved_va, which would trigger an assert().
+     */
+    if (reserved_va != 0 &&
+        TARGET_VSYSCALL_PAGE + TARGET_PAGE_SIZE - 1 > reserved_va) {
+        error_report("Cannot allocate vsyscall page");
+        exit(EXIT_FAILURE);
+    }
+    page_set_flags(TARGET_VSYSCALL_PAGE,
+                   TARGET_VSYSCALL_PAGE | ~TARGET_PAGE_MASK,
+                   PAGE_EXEC | PAGE_VALID);
+    return true;
+}
+
 void elf_core_copy_regs(target_elf_gregset_t *r, const CPUX86State *env)
 {
     r->pt.r15 = tswapal(env->regs[15]);