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README: Fix kernel command line console argument

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We use the virtio console device now.

Fixes: #116

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
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Samuel Ortiz 2019-07-24 15:20:39 +02:00 committed by Sebastien Boeuf
parent 1f6f52249e
commit 46eaea1627
1 changed files with 21 additions and 0 deletions
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@ -168,6 +168,26 @@ $ sudo setcap cap_net_admin+ep ./cloud-hypervisor/target/release/cloud-hyperviso
$ ./cloud-hypervisor/target/release/cloud-hypervisor \
--kernel ./linux-cloud-hypervisor/arch/x86/boot/compressed/vmlinux.bin \
--disk ./clear-29160-kvm.img \
--cmdline "console=hvc0 reboot=k panic=1 nomodules i8042.noaux i8042.nomux i8042.nopnp i8042.dumbkbd root=/dev/vda3" \
--cpus 4 \
--memory size=1024M \
--net "tap=,mac=,ip=,mask=" \
--rng
```
The above example use the `virtio-console` device as the guest console, and this
device may not be enabled soon enough by the guest kernel to get early kernel
debug messages.
When in need for earlier debug messages, using the legacy serial device based
console is preferred:
```
$ ./cloud-hypervisor/target/release/cloud-hypervisor \
--kernel ./linux-cloud-hypervisor/arch/x86/boot/compressed/vmlinux.bin \
--console off \
--serial tty \
--disk ./clear-29160-kvm.img \
--cmdline "console=ttyS0 reboot=k panic=1 nomodules i8042.noaux i8042.nomux i8042.nopnp i8042.dumbkbd root=/dev/vda3" \
--cpus 4 \
--memory size=1024M \
@ -175,6 +195,7 @@ $ ./cloud-hypervisor/target/release/cloud-hypervisor \
--rng
```
# 3. Status
`cloud-hypervisor` is in a very early, pre-alpha stage. Use at your own risk!