QEMU KVM runs only with host CPU

Makefile

@@ -13,6 +13,7 @@ all:
 
 	tar xf libguestfs-1.42.0.tar.gz
 	patch -Np1 -d libguestfs-1.42.0 < libguestfs-1.42.0-certo.patch
+	patch -Np1 -d libguestfs-1.42.0 < libguestfs-1.42.0-cpu_host.patch
 	patch -Np1 -d libguestfs-1.42.0 < libguestfs-1.42.0-mlv2v.patch
 	cd libguestfs-1.42.0 && ./configure --prefix=/usr --with-extra-packages="glibc readline ncurses util-linux xz pcre zlib systemd iproute2 libcap jansson augeas hivex libtirpc parted mdadm libaio cryptsetup popt openssl json-c cdrkit gptfdisk gcc"
 	$(MAKE) -C libguestfs-1.42.0

libguestfs-1.42.0-cpu_host.patch

+diff -uNr libguestfs-1.42.0/lib/qemu.c libguestfs-1.42.0-cpu_host/lib/qemu.c
+--- libguestfs-1.42.0/lib/qemu.c	2020-03-06 19:31:08.173077897 +0000
++++ libguestfs-1.42.0-cpu_host/lib/qemu.c	2020-06-19 15:26:17.305478459 +0000
+@@ -576,6 +576,7 @@
+ #endif
+                                      "accel=kvm:tcg");
+   guestfs_int_cmd_add_string_unquoted (cmd, " -qmp stdio");
++  guestfs_int_cmd_add_string_unquoted (cmd, " -cpu host");
+   guestfs_int_cmd_clear_capture_errors (cmd);
+ 
+   fd = guestfs_int_cmd_pipe_run (cmd, "r");