optimize qemu params on x86_64

Author: ilmanzo

source/aarch64.d

@@ -23,8 +23,7 @@ class AARCH64_VM : VirtualMachine
         return [
             "-machine", "virt",
             "-cpu", "max",
-            "-bios", "/usr/share/qemu/aavmf-aarch64-code.bin"
-           
+            "-bios", "/usr/share/qemu/aavmf-aarch64-code.bin",
         ];
     }
 
@@ -33,7 +32,7 @@ class AARCH64_VM : VirtualMachine
     {
         return [
             "-drive",
-            format("file=%s,if=virtio,cache=none,aio=native,discard=unmap", diskPath)
+            format("file=%s,if=virtio,cache=writeback,aio=native,discard=unmap,cache.direct=on", diskPath)
         ];
     }
 

source/ppc64le.d

@@ -25,7 +25,7 @@ class PPC64LE_VM : VirtualMachine
     {
         return [
             "-drive",
-            format("file=%s,if=virtio,cache=none,aio=native,discard=unmap", diskPath)
+            format("file=%s,if=virtio,cache=writeback,aio=native,discard=unmap,cache.direct=on", diskPath)
         ];
     }
 

source/x86_64.d

@@ -17,7 +17,7 @@ class X86_64_VM : VirtualMachine
     /// Returns an array of architecture-specific QEMU arguments.
     override string[] getArchArgs()
     {
-        return ["-M", "q35"];
+        return ["-M", "q35", "-enable-kvm", "-cpu", "host"];
     }
 
     /// Returns an array of QEMU arguments for graphical output.
@@ -31,7 +31,7 @@ class X86_64_VM : VirtualMachine
     {
         return [
             "-drive",
-            format("file=%s,if=virtio,cache=none,aio=native,discard=unmap", diskPath)
+            format("file=%s,if=virtio,cache=writeback,aio=native,discard=unmap,cache.direct=on", diskPath)
         ];
     }