kvm: Ignore MMIO accesses

Lets cheat some more and ignore MMIO accesses altogether.

Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>

Makefile

@@ -14,9 +14,10 @@ OBJS	+= interrupt.o
 OBJS	+= ioport.o
 OBJS	+= kvm.o
 OBJS	+= main.o
+OBJS	+= mmio.o
 OBJS	+= util.o
-OBJS	+= bios/c-intfake.o
 OBJS	+= bios/c-int10.o
+OBJS	+= bios/c-intfake.o
 
 CFLAGS	+= $(CPPFLAGS) -Iinclude -g
 

include/kvm/kvm.h

@@ -39,6 +39,7 @@ bool kvm__load_kernel(struct kvm *kvm, const char *kernel_filename, const char *
 void kvm__reset_vcpu(struct kvm *self);
 void kvm__run(struct kvm *self);
 bool kvm__emulate_io(struct kvm *self, uint16_t port, void *data, int direction, int size, uint32_t count);
+bool kvm__emulate_mmio(struct kvm *self, uint64_t phys_addr, uint8_t *data, uint32_t len, uint8_t is_write);
 
 /*
  * Debugging

main.c

@@ -80,6 +80,20 @@ int main(int argc, char *argv[])
 				goto exit_kvm;
 			break;
 		}
+		case KVM_EXIT_MMIO: {
+			bool ret;
+
+			ret = kvm__emulate_mmio(kvm,
+					kvm->kvm_run->mmio.phys_addr,
+					kvm->kvm_run->mmio.data,
+					kvm->kvm_run->mmio.len,
+					kvm->kvm_run->mmio.is_write);
+
+			if (!ret)
+				goto exit_kvm;
+			break;
+
+		}
 		default:
 			goto exit_kvm;
 		}

mmio.c

@@ -0,0 +1,19 @@
+#include "kvm/kvm.h"
+
+#include <stdio.h>
+
+static const char *to_direction(uint8_t is_write)
+{
+	if (is_write)
+		return "write";
+
+	return "read";
+}
+
+bool kvm__emulate_mmio(struct kvm *self, uint64_t phys_addr, uint8_t *data, uint32_t len, uint8_t is_write)
+{
+	fprintf(stderr, "Warning: Ignoring MMIO %s at %016" PRIx64 " (length %" PRIu32 ")\n",
+		to_direction(is_write), phys_addr, len);
+
+	return true;
+}