diff mbox series

[23/60] linux-user/nios2: Remove qemu_host_page_size from init_guest_commpage

Message ID 20240301230619.661008-24-richard.henderson@linaro.org
State Accepted
Commit 51f8c9b8720f30ba1c4eb1d977ae7bce7884555e
Headers show
Series [01/60] linux-user/elfload: Disable core dump if getrlimit fails | expand

Commit Message

Richard Henderson March 1, 2024, 11:05 p.m. UTC 
Use qemu_real_host_page_size.
If !reserved_va, use MAP_FIXED_NOREPLACE.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Acked-by: Helge Deller <deller@gmx.de>
Message-Id: <20240102015808.132373-7-richard.henderson@linaro.org>
---
 linux-user/elfload.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index 53b61aac77..479acb4e7b 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -1532,10 +1532,14 @@  static bool init_guest_commpage(void)
                  0x3a, 0x68, 0x3b, 0x00,  /* trap 0 */
     };
 
-    void *want = g2h_untagged(LO_COMMPAGE & -qemu_host_page_size);
-    void *addr = mmap(want, qemu_host_page_size, PROT_READ | PROT_WRITE,
-                      MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
+    int host_page_size = qemu_real_host_page_size();
+    void *want, *addr;
 
+    want = g2h_untagged(LO_COMMPAGE & -host_page_size);
+    addr = mmap(want, host_page_size, PROT_READ | PROT_WRITE,
+                MAP_ANONYMOUS | MAP_PRIVATE |
+                (reserved_va ? MAP_FIXED : MAP_FIXED_NOREPLACE),
+                -1, 0);
     if (addr == MAP_FAILED) {
         perror("Allocating guest commpage");
         exit(EXIT_FAILURE);
@@ -1544,9 +1548,9 @@  static bool init_guest_commpage(void)
         return false;
     }
 
-    memcpy(addr, kuser_page, sizeof(kuser_page));
+    memcpy(g2h_untagged(LO_COMMPAGE), kuser_page, sizeof(kuser_page));
 
-    if (mprotect(addr, qemu_host_page_size, PROT_READ)) {
+    if (mprotect(addr, host_page_size, PROT_READ)) {
         perror("Protecting guest commpage");
         exit(EXIT_FAILURE);
     }