README: Add drive format property to QEMU command line

Newer QEMU versions complain about missing format property, possibly
reject such configurations eventually.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

diff --git a/README.md b/README.md
index 9298c4f6eda53938bb48c6b920e7e06c7fb77e6f..ec39a6bcfafa43a6143b2603ebe2f5582fe6080d 100644 (file)
--- a/README.md
+++ b/README.md
@@ -172,7 +172,7 @@ enable nested VMX support. Start the virtual machine as follows:
 
     qemu-system-x86_64 -machine q35 -m 1G -enable-kvm -smp 4 \
         -cpu kvm64,-kvm_pv_eoi,-kvm_steal_time,-kvm_asyncpf,-kvmclock,+vmx,+x2apic \
-        -drive file=LinuxInstallation.img,id=disk,if=none \
+        -drive file=LinuxInstallation.img,format=raw|qcow2|...,id=disk,if=none \
         -device ide-hd,drive=disk -serial stdio -serial vc \
         -device intel-hda,addr=1b.0 -device hda-duplex
 
@@ -181,7 +181,7 @@ nested SVM support. Start the virtual machine as follows:
 
     qemu-system-x86_64 -machine q35 -m 1G -enable-kvm -smp 4 \
         -cpu host,-kvm_pv_eoi,-kvm_steal_time,-kvm_asyncpf,-kvmclock,+svm,+x2apic \
-        -drive file=LinuxInstallation.img,id=disk,if=none \
+        -drive file=LinuxInstallation.img,format=raw|qcow2|...,id=disk,if=none \
         -device ide-hd,drive=disk -serial stdio -serial vc \
         -device intel-hda,addr=1b.0 -device hda-duplex