From 4e8201da07c5c78fe0d764a064f3fcd929f5bef7 Mon Sep 17 00:00:00 2001
From: Geoffrey McRae <geoff@hostfission.com>
Date: Thu, 5 Sep 2024 14:01:28 +1000
Subject: [PATCH] [common] ivshmem: default to /dev/kvmfr0 if it's found

---
 common/src/platform/linux/ivshmem.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/common/src/platform/linux/ivshmem.c b/common/src/platform/linux/ivshmem.c
index 0d9a7502..66087af8 100644
--- a/common/src/platform/linux/ivshmem.c
+++ b/common/src/platform/linux/ivshmem.c
@@ -86,6 +86,15 @@ static StringList ivshmemDeviceGetValues(struct Option * option)
 
 void ivshmemOptionsInit(void)
 {
+  char * shmFile;
+  struct stat st;
+
+  // if there is a kvmfr device, default to using it instead
+  if (stat("/dev/kvmfr0", &st) == 0)
+    shmFile = "/dev/kvmfr0";
+  else
+    shmFile = "/dev/shm/looking-glass";
+
   struct Option options[] =
   {
     {
@@ -94,7 +103,7 @@ void ivshmemOptionsInit(void)
       .shortopt       = 'f',
       .description    = "The path to the shared memory file, or the name of the kvmfr device to use, e.g. kvmfr0",
       .type           = OPTION_TYPE_STRING,
-      .value.x_string = "/dev/shm/looking-glass",
+      .value.x_string = shmFile,
       .validator      = ivshmemDeviceValidator,
       .getValues      = ivshmemDeviceGetValues
     },