[RFC] kvm tools: Make kvm__arch_setup_firmware to return error code

[RFC] kvm tools: Make kvm__arch_setup_firmware to return error code

[Cyrill Gorcunov]

If some of subsequent calls fails we better to return error
code instead of dying with a message. This is a first step
in getting rid of number of die() calls we have in code.

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
---
 tools/kvm/builtin-run.c             |    5 ++++-
 tools/kvm/include/kvm/kvm.h         |    2 +-
 tools/kvm/powerpc/kvm.c             |    4 +++-
 tools/kvm/x86/include/kvm/mptable.h |    2 +-
 tools/kvm/x86/kvm.c                 |    4 ++--
 tools/kvm/x86/mptable.c             |   10 +++++++---
 6 files changed, 18 insertions(+), 9 deletions(-)

Index: linux-2.6.git/tools/kvm/builtin-run.c
===================================================================
--- linux-2.6.git.orig/tools/kvm/builtin-run.c
+++ linux-2.6.git/tools/kvm/builtin-run.c
@@ -1121,7 +1121,9 @@ int kvm_cmd_run(int argc, const char **a
 
 	kvm__start_timer(kvm);
 
-	kvm__arch_setup_firmware(kvm);
+	exit_code = kvm__arch_setup_firmware(kvm);
+	if (exit_code)
+		goto err;
 
 	for (i = 0; i < nrcpus; i++) {
 		kvm_cpus[i] = kvm_cpu__init(kvm, i);
@@ -1151,6 +1153,7 @@ int kvm_cmd_run(int argc, const char **a
 			exit_code = 1;
 	}
 
+err:
 	compat__print_all_messages();
 
 	fb__stop();
Index: linux-2.6.git/tools/kvm/include/kvm/kvm.h
===================================================================
--- linux-2.6.git.orig/tools/kvm/include/kvm/kvm.h
+++ linux-2.6.git/tools/kvm/include/kvm/kvm.h
@@ -55,7 +55,7 @@ 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, const char *hugetlbfs_path, u64 ram_size, const char *name);
-void kvm__arch_setup_firmware(struct kvm *kvm);
+int kvm__arch_setup_firmware(struct kvm *kvm);
 bool kvm__arch_cpu_supports_vm(void);
 void kvm__arch_periodic_poll(struct kvm *kvm);
 
Index: linux-2.6.git/tools/kvm/powerpc/kvm.c
===================================================================
--- linux-2.6.git.orig/tools/kvm/powerpc/kvm.c
+++ linux-2.6.git/tools/kvm/powerpc/kvm.c
@@ -176,7 +176,7 @@ static void setup_fdt(struct kvm *kvm)
 /**
  * kvm__arch_setup_firmware
  */
-void kvm__arch_setup_firmware(struct kvm *kvm)
+int kvm__arch_setup_firmware(struct kvm *kvm)
 {
 	/* Load RTAS */
 
@@ -184,4 +184,6 @@ void kvm__arch_setup_firmware(struct kvm
 
 	/* Init FDT */
 	setup_fdt(kvm);
+
+	return 0;
 }
Index: linux-2.6.git/tools/kvm/x86/include/kvm/mptable.h
===================================================================
--- linux-2.6.git.orig/tools/kvm/x86/include/kvm/mptable.h
+++ linux-2.6.git/tools/kvm/x86/include/kvm/mptable.h
@@ -3,6 +3,6 @@
 
 struct kvm;
 
-void mptable_setup(struct kvm *kvm, unsigned int ncpus);
+int mptable_setup(struct kvm *kvm, unsigned int ncpus);
 
 #endif /* KVM_MPTABLE_H_ */
Index: linux-2.6.git/tools/kvm/x86/kvm.c
===================================================================
--- linux-2.6.git.orig/tools/kvm/x86/kvm.c
+++ linux-2.6.git/tools/kvm/x86/kvm.c
@@ -349,7 +349,7 @@ bool load_bzimage(struct kvm *kvm, int f
  * This function is a main routine where we poke guest memory
  * and install BIOS there.
  */
-void kvm__arch_setup_firmware(struct kvm *kvm)
+int kvm__arch_setup_firmware(struct kvm *kvm)
 {
 	/* standart minimal configuration */
 	setup_bios(kvm);
@@ -357,7 +357,7 @@ void kvm__arch_setup_firmware(struct kvm
 	/* FIXME: SMP, ACPI and friends here */
 
 	/* MP table */
-	mptable_setup(kvm, kvm->nrcpus);
+	return mptable_setup(kvm, kvm->nrcpus);
 }
 
 void kvm__arch_periodic_poll(struct kvm *kvm)
Index: linux-2.6.git/tools/kvm/x86/mptable.c
===================================================================
--- linux-2.6.git.orig/tools/kvm/x86/mptable.c
+++ linux-2.6.git/tools/kvm/x86/mptable.c
@@ -71,7 +71,7 @@ static void mptable_add_irq_src(struct m
 /**
  * mptable_setup - create mptable and fill guest memory with it
  */
-void mptable_setup(struct kvm *kvm, unsigned int ncpus)
+int mptable_setup(struct kvm *kvm, unsigned int ncpus)
 {
 	unsigned long real_mpc_table, real_mpf_intel, size;
 	struct mpf_intel *mpf_intel;
@@ -264,8 +264,11 @@ void mptable_setup(struct kvm *kvm, unsi
 	 */
 
 	if (size > (unsigned long)(MB_BIOS_END - bios_rom_size) ||
-	    size > MPTABLE_MAX_SIZE)
-		die("MP table is too big");
+	    size > MPTABLE_MAX_SIZE) {
+		free(mpc_table);
+		pr_err("MP table is too big");
+		return -1;
+	}
 
 	/*
 	 * OK, it is time to move it to guest memory.
@@ -273,4 +276,5 @@ void mptable_setup(struct kvm *kvm, unsi
 	memcpy(guest_flat_to_host(kvm, real_mpc_table), mpc_table, size);
 
 	free(mpc_table);
+	return 0;
 }