[PATCH] softmmu/vl: Fence 'xenfb' if Xen support is not compiled in

From: Thomas Huth <thuth@redhat.com>
To: qemu-devel@nongnu.org, Paolo Bonzini <pbonzini@redhat.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>,
	Paul Durrant <paul@xen.org>,
	qemu-trivial@nongnu.org, kraxel@redhat.com,
	Anthony Perard <anthony.perard@citrix.com>,
	xen-devel@lists.xenproject.org
Subject: [PATCH] softmmu/vl: Fence 'xenfb' if Xen support is not compiled in
Date: Wed, 27 Apr 2022 14:33:16 +0200	[thread overview]
Message-ID: <20220427123316.329312-1-thuth@redhat.com> (raw)

The 'xenfb' parameter for the '-vga' command line option is currently
always enabled unconditionally (since the xenfb is not a proper QOM
device that could be tested via its class name). That means it also
shows up if Xen is not enabled at all, e.g. like this:

 $ ./qemu-system-sparc -vga help
 none                 no graphic card
 xenfb                Xen paravirtualized framebuffer
 tcx                  TCX framebuffer (default)
 cg3                  CG3 framebuffer

Let's avoid this situation by fencing the parameter with the
CONFIG_XEN_BACKEND switch.

Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 softmmu/vl.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/softmmu/vl.c b/softmmu/vl.c
index 06a0e342fe..e26421b815 100644
--- a/softmmu/vl.c
+++ b/softmmu/vl.c
@@ -934,10 +934,12 @@ static const VGAInterfaceInfo vga_interfaces[VGA_TYPE_MAX] = {
         .name = "CG3 framebuffer",
         .class_names = { "cgthree" },
     },
+#ifdef CONFIG_XEN_BACKEND
     [VGA_XENFB] = {
         .opt_name = "xenfb",
         .name = "Xen paravirtualized framebuffer",
     },
+#endif
 };
 
 static bool vga_interface_available(VGAInterfaceType t)
-- 
2.27.0


