boot-qemu.py: Eliminate _can_use_kvm() for arm64 and x86

The subclasses of QEMURunner can just initialize use_kvm in their
constructors.

ARMV7QEMURunner continues to use a separate method for initialization of
use_kvm because of the check for 32-bit EL1.

Signed-off-by: Nathan Chancellor <nathan@kernel.org>

Author: nathanchance

boot-qemu.py

@@ -53,7 +53,7 @@ def __init__(self):
         # subclasses to set certain properties but the user can explicitly opt
         # out of KVM after instantiation, so any decisions based on it should
         # be confined to run().
-        self.use_kvm = self._can_use_kvm()
+        self.use_kvm = False
         self.smp = 0
         self.timeout = ''
 
@@ -72,9 +72,6 @@ def __init__(self):
         self._qemu_path = None
         self._ram = '512m'
 
-    def _can_use_kvm(self):
-        return False
-
     def _find_dtb(self):
         if not self._dtb:
             raise RuntimeError('No dtb set?')
@@ -360,6 +357,8 @@ class ARMV7QEMURunner(ARMQEMURunner):
     def __init__(self):
         super().__init__()
 
+        self.use_kvm = self._can_use_kvm()
+
         self.cmdline += ['console=ttyAMA0', 'earlycon']
 
     def _can_use_kvm(self):
@@ -394,14 +393,13 @@ def __init__(self):
 
         self.cmdline += ['console=ttyAMA0', 'earlycon']
         self.supports_efi = True
+        self.use_kvm = platform.machine() == 'aarch64' and \
+                       self._have_dev_kvm_access()
 
         self._default_kernel_path = Path('arch/arm64/boot/Image.gz')
         self._initrd_arch = 'arm64'
         self._qemu_arch = 'aarch64'
 
-    def _can_use_kvm(self):
-        return platform.machine() == 'aarch64' and self._have_dev_kvm_access()
-
     def _get_cpu_val(self):
         cpu = ['max']
 
@@ -605,14 +603,13 @@ def __init__(self):
         super().__init__()
 
         self.cmdline += ['console=ttyS0', 'earlycon=uart8250,io,0x3f8']
+        self.use_kvm = platform.machine() == 'x86_64' and \
+                       self._have_dev_kvm_access()
 
         self._default_kernel_path = Path('arch/x86/boot/bzImage')
         self._initrd_arch = 'x86'
         self._qemu_arch = 'i386'
 
-    def _can_use_kvm(self):
-        return platform.machine() == 'x86_64' and self._have_dev_kvm_access()
-
     def run(self):
         if self.use_kvm and not self.efi:
             # There are a lot of messages along the line of