kvm: remove redundant registration of BSP's hv_clock area

These days hv_clock allocation is memblock based (i.e. the percpu allocator is not involved), which means that the physical address of each of the per-cpu hv_clock areas is guaranteed to remain unchanged through all its lifetime and we do not need to update its location after CPU bring-up.

Signed-off-by Fernando Luis Vazquez Cao <[email protected]>

---

diff -urNp linux-3.14-rc2-orig/arch/x86/kernel/kvm.c linux-3.14-rc2/arch/x86/kernel/kvm.c

arch/x86/kernel/kvm.c +0 -1

@@ -417,7 +417,6 @@ void kvm_disable_steal_time(void)
 #ifdef CONFIG_SMP
 static void __init kvm_smp_prepare_boot_cpu(void)
 {
-	WARN_ON(kvm_register_clock("primary cpu clock"));
 	kvm_guest_cpu_init();
 	native_smp_prepare_boot_cpu();
 	kvm_spinlock_init();

diff -urNp linux-3.14-rc2-orig/arch/x86/kernel/kvmclock.c linux-3.14-rc2/arch/x86/kernel/kvmclock.c

arch/x86/kernel/kvmclock.c +0 -1

 		hv_clock = NULL;
 		memblock_free(mem, size);
 		return;
 
 
 
--

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These days hv_clock allocation is memblock based (i.e. the percpu allocator is not involved), which means that the physical address of each of the per-cpu hv_clock areas is guaranteed to remain unchanged through all its lifetime and we do not need to update its location after CPU bring-up.

Signed-off-by Fernando Luis Vazquez Cao <[email protected]>

---

diff -urNp linux-3.14-rc3-orig/arch/x86/kernel/kvm.c linux-3.14-rc3/arch/x86/kernel/kvm.c

arch/x86/kernel/kvm.c +0 -1

@@ -417,7 +417,6 @@ void kvm_disable_steal_time(void)
 #ifdef CONFIG_SMP
 static void __init kvm_smp_prepare_boot_cpu(void)
 {
-	WARN_ON(kvm_register_clock("primary cpu clock"));
 	kvm_guest_cpu_init();
 	native_smp_prepare_boot_cpu();
 	kvm_spinlock_init();

diff -urNp linux-3.14-rc3-orig/arch/x86/kernel/kvmclock.c linux-3.14-rc3/arch/x86/kernel/kvmclock.c

arch/x86/kernel/kvmclock.c +1 -2

@@ -242,7 +242,7 @@ void __init kvmclock_init(void)
 	hv_clock = __va(mem);
 	memset(hv_clock, 0, size);
 
-	if (kvm_register_clock("boot clock")) {
+	if (kvm_register_clock("primary cpu clock")) {
 		hv_clock = NULL;
 		memblock_free(mem, size);
 		return;
 
 
--

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