MIPS: Remove KVM_GUEST support

KVM_GUEST is broken and unmaintained, so let's remove it.
Reviewed-by: Huacai Chen <chenhuacai@kernel.org>
Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/Kconfig

@@ -2222,23 +2222,6 @@ config 64BIT
 
 endchoice
 
-config KVM_GUEST
-	bool "KVM Guest Kernel"
-	depends on CPU_MIPS32_R2
-	depends on !64BIT && BROKEN_ON_SMP
-	help
-	  Select this option if building a guest kernel for KVM (Trap & Emulate)
-	  mode.
-
-config KVM_GUEST_TIMER_FREQ
-	int "Count/Compare Timer Frequency (MHz)"
-	depends on KVM_GUEST
-	default 100
-	help
-	  Set this to non-zero if building a guest kernel for KVM to skip RTC
-	  emulation when determining guest CPU Frequency. Instead, the guest's
-	  timer frequency is specified directly.
-
 config MIPS_VA_BITS_48
 	bool "48 bits virtual memory"
 	depends on 64BIT

arch/mips/include/asm/mach-generic/spaces.h

@@ -30,11 +30,7 @@
 #endif /* __ASSEMBLY__ */
 
 #ifdef CONFIG_32BIT
-#ifdef CONFIG_KVM_GUEST
-#define CAC_BASE		_AC(0x40000000, UL)
-#else
 #define CAC_BASE		_AC(0x80000000, UL)
-#endif
 #ifndef IO_BASE
 #define IO_BASE			_AC(0xa0000000, UL)
 #endif
@@ -43,12 +39,8 @@
 #endif
 
 #ifndef MAP_BASE
-#ifdef CONFIG_KVM_GUEST
-#define MAP_BASE		_AC(0x60000000, UL)
-#else
 #define MAP_BASE		_AC(0xc0000000, UL)
 #endif
-#endif
 
 /*
  * Memory above this physical address will be considered highmem.
@@ -100,11 +92,7 @@
 #endif
 
 #ifndef FIXADDR_TOP
-#ifdef CONFIG_KVM_GUEST
-#define FIXADDR_TOP		((unsigned long)(long)(int)0x7ffe0000)
-#else
 #define FIXADDR_TOP		((unsigned long)(long)(int)0xfffe0000)
 #endif
-#endif
 
 #endif /* __ASM_MACH_GENERIC_SPACES_H */

arch/mips/include/asm/processor.h

@@ -32,16 +32,11 @@ extern unsigned int vced_count, vcei_count;
 extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
 
 #ifdef CONFIG_32BIT
-#ifdef CONFIG_KVM_GUEST
-/* User space process size is limited to 1GB in KVM Guest Mode */
-#define TASK_SIZE	0x3fff8000UL
-#else
 /*
  * User space process size: 2GB. This is hardcoded into a few places,
  * so don't change it unless you know what you are doing.
  */
 #define TASK_SIZE	0x80000000UL
-#endif
 
 #define STACK_TOP_MAX	TASK_SIZE
 

arch/mips/include/asm/uaccess.h

@@ -25,11 +25,7 @@
  */
 #ifdef CONFIG_32BIT
 
-#ifdef CONFIG_KVM_GUEST
-#define __UA_LIMIT 0x40000000UL
-#else
 #define __UA_LIMIT 0x80000000UL
-#endif
 
 #define __UA_ADDR	".word"
 #define __UA_LA		"la"
@@ -61,13 +57,8 @@ extern u64 __ua_limit;
  * address in this range it's the process's problem, not ours :-)
  */
 
-#ifdef CONFIG_KVM_GUEST
-#define KERNEL_DS	((mm_segment_t) { 0x80000000UL })
-#define USER_DS		((mm_segment_t) { 0xC0000000UL })
-#else
 #define KERNEL_DS	((mm_segment_t) { 0UL })
 #define USER_DS		((mm_segment_t) { __UA_LIMIT })
-#endif
 
 #define get_fs()	(current_thread_info()->addr_limit)
 #define set_fs(x)	(current_thread_info()->addr_limit = (x))

arch/mips/kernel/cevt-r4k.c

@@ -195,10 +195,6 @@ int c0_compare_int_usable(void)
 	unsigned int delta;
 	unsigned int cnt;
 
-#ifdef CONFIG_KVM_GUEST
-    return 1;
-#endif
-
 	/*
 	 * IP7 already pending?	 Try to clear it by acking the timer.
 	 */

arch/mips/mti-malta/Platform

@@ -2,9 +2,5 @@
 # MIPS Malta board
 #
 cflags-$(CONFIG_MIPS_MALTA)	+= -I$(srctree)/arch/mips/include/asm/mach-malta
-ifdef CONFIG_KVM_GUEST
-    load-$(CONFIG_MIPS_MALTA)	+= 0x0000000040100000
-else
-    load-$(CONFIG_MIPS_MALTA)	+= 0xffffffff80100000
-endif
+load-$(CONFIG_MIPS_MALTA)	+= 0xffffffff80100000
 all-$(CONFIG_MIPS_MALTA)	:= $(COMPRESSION_FNAME).bin

arch/mips/mti-malta/malta-time.c

@@ -66,11 +66,6 @@ static void __init estimate_frequencies(void)
 	int secs;
 	u64 giccount = 0, gicstart = 0;
 
-#if defined(CONFIG_KVM_GUEST) && CONFIG_KVM_GUEST_TIMER_FREQ
-	mips_hpt_frequency = CONFIG_KVM_GUEST_TIMER_FREQ * 1000000;
-	return;
-#endif
-
 	local_irq_save(flags);
 
 	if (mips_gic_present())