[PATCH 12/28] kvm tools: Move arch-specific cmdline init into kvm__arch_set_cmdline()

[Matt Evans <matt@ozlabs.org>]

Different systems will want different base kernel commandlines, e.g. non-x86
systems probably don't need noapic, i8042.* etc., so set the commandline up in
arch-specific code.  Then, if the resulting commandline is empty, don't strcat a
space onto the front.

Signed-off-by: Matt Evans <matt@ozlabs.org>
---
 tools/kvm/builtin-run.c     |   12 +++++-------
 tools/kvm/include/kvm/kvm.h |    1 +
 tools/kvm/x86/kvm.c         |   11 +++++++++++
 3 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/tools/kvm/builtin-run.c b/tools/kvm/builtin-run.c
index 9ef331e..a67bd8c 100644
--- a/tools/kvm/builtin-run.c
+++ b/tools/kvm/builtin-run.c
@@ -835,13 +835,11 @@ int kvm_cmd_run(int argc, const char **argv, const char *prefix)
 		vidmode = 0;
 
 	memset(real_cmdline, 0, sizeof(real_cmdline));
-	strcpy(real_cmdline, "noapic noacpi pci=conf1 reboot=k panic=1 i8042.direct=1 "
-				"i8042.dumbkbd=1 i8042.nopnp=1");
-	if (vnc || sdl) {
-		strcat(real_cmdline, " video=vesafb console=tty0");
-	} else
-		strcat(real_cmdline, " console=ttyS0 earlyprintk=serial i8042.noaux=1");
-	strcat(real_cmdline, " ");
+	kvm__arch_set_cmdline(real_cmdline, vnc || sdl);
+
+	if (strlen(real_cmdline) > 0)
+		strcat(real_cmdline, " ");
+
 	if (kernel_cmdline)
 		strlcat(real_cmdline, kernel_cmdline, sizeof(real_cmdline));
 
diff --git a/tools/kvm/include/kvm/kvm.h b/tools/kvm/include/kvm/kvm.h
index 60842d5..fae2ba9 100644
--- a/tools/kvm/include/kvm/kvm.h
+++ b/tools/kvm/include/kvm/kvm.h
@@ -53,6 +53,7 @@ int kvm__get_sock_by_instance(const char *name);
 int kvm__enumerate_instances(int (*callback)(const char *name, int pid));
 void kvm__remove_socket(const char *name);
 
+void kvm__arch_set_cmdline(char *cmdline, bool video);
 void kvm__arch_init(struct kvm *kvm, const char *kvm_dev, u64 ram_size, const char *name);
 void kvm__arch_setup_firmware(struct kvm *kvm);
 bool kvm__arch_cpu_supports_vm(void);
diff --git a/tools/kvm/x86/kvm.c b/tools/kvm/x86/kvm.c
index 45dcb77..7071dc6 100644
--- a/tools/kvm/x86/kvm.c
+++ b/tools/kvm/x86/kvm.c
@@ -149,6 +149,17 @@ void kvm__init_ram(struct kvm *kvm)
 	}
 }
 
+/* Arch-specific commandline setup */
+void kvm__arch_set_cmdline(char *cmdline, bool video)
+{
+	strcpy(cmdline, "noapic noacpi pci=conf1 reboot=k panic=1 i8042.direct=1 "
+				"i8042.dumbkbd=1 i8042.nopnp=1");
+	if (video) {
+		strcat(cmdline, " video=vesafb console=tty0");
+	} else
+		strcat(cmdline, " console=ttyS0 earlyprintk=serial i8042.noaux=1");
+}
+
 /* Architecture-specific KVM init */
 void kvm__arch_init(struct kvm *kvm, const char *kvm_dev, u64 ram_size, const char *name)
 {