MIPS: KVM: Use local_flush_icache_range to fix RI on XBurst

MIPS KVM uses mips32_SyncICache to synchronise the icache with the
dcache after dynamically modifying guest instructions or writing guest
exception vector. However this uses rdhwr to get the SYNCI step, which
causes a reserved instruction exception on Ingenic XBurst cores.

It would seem to make more sense to use local_flush_icache_range()
instead which does the same thing but is more portable.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Gleb Natapov <gleb@kernel.org>
Cc: kvm@vger.kernel.org
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: Sanjay Lal <sanjayl@kymasys.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/arch/mips/kvm/kvm_mips_dyntrans.c b/arch/mips/kvm/kvm_mips_dyntrans.c
index 96528e2..b80e41d 100644
--- a/arch/mips/kvm/kvm_mips_dyntrans.c
+++ b/arch/mips/kvm/kvm_mips_dyntrans.c
@@ -16,6 +16,7 @@
 #include <linux/vmalloc.h>
 #include <linux/fs.h>
 #include <linux/bootmem.h>
+#include <asm/cacheflush.h>
 
 #include "kvm_mips_comm.h"
 
@@ -40,7 +41,7 @@
 	    CKSEG0ADDR(kvm_mips_translate_guest_kseg0_to_hpa
 		       (vcpu, (unsigned long) opc));
 	memcpy((void *)kseg0_opc, (void *)&synci_inst, sizeof(uint32_t));
-	mips32_SyncICache(kseg0_opc, 32);
+	local_flush_icache_range(kseg0_opc, kseg0_opc + 32);
 
 	return result;
 }
@@ -66,7 +67,7 @@
 	    CKSEG0ADDR(kvm_mips_translate_guest_kseg0_to_hpa
 		       (vcpu, (unsigned long) opc));
 	memcpy((void *)kseg0_opc, (void *)&synci_inst, sizeof(uint32_t));
-	mips32_SyncICache(kseg0_opc, 32);
+	local_flush_icache_range(kseg0_opc, kseg0_opc + 32);
 
 	return result;
 }
@@ -99,11 +100,12 @@
 		    CKSEG0ADDR(kvm_mips_translate_guest_kseg0_to_hpa
 			       (vcpu, (unsigned long) opc));
 		memcpy((void *)kseg0_opc, (void *)&mfc0_inst, sizeof(uint32_t));
-		mips32_SyncICache(kseg0_opc, 32);
+		local_flush_icache_range(kseg0_opc, kseg0_opc + 32);
 	} else if (KVM_GUEST_KSEGX((unsigned long) opc) == KVM_GUEST_KSEG23) {
 		local_irq_save(flags);
 		memcpy((void *)opc, (void *)&mfc0_inst, sizeof(uint32_t));
-		mips32_SyncICache((unsigned long) opc, 32);
+		local_flush_icache_range((unsigned long)opc,
+					 (unsigned long)opc + 32);
 		local_irq_restore(flags);
 	} else {
 		kvm_err("%s: Invalid address: %p\n", __func__, opc);
@@ -134,11 +136,12 @@
 		    CKSEG0ADDR(kvm_mips_translate_guest_kseg0_to_hpa
 			       (vcpu, (unsigned long) opc));
 		memcpy((void *)kseg0_opc, (void *)&mtc0_inst, sizeof(uint32_t));
-		mips32_SyncICache(kseg0_opc, 32);
+		local_flush_icache_range(kseg0_opc, kseg0_opc + 32);
 	} else if (KVM_GUEST_KSEGX((unsigned long) opc) == KVM_GUEST_KSEG23) {
 		local_irq_save(flags);
 		memcpy((void *)opc, (void *)&mtc0_inst, sizeof(uint32_t));
-		mips32_SyncICache((unsigned long) opc, 32);
+		local_flush_icache_range((unsigned long)opc,
+					 (unsigned long)opc + 32);
 		local_irq_restore(flags);
 	} else {
 		kvm_err("%s: Invalid address: %p\n", __func__, opc);