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https://github.com/clearlinux/kvmtool.git
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Sasha Levin
f616b10ba9
Signed-off-by: Sasha Levin <levinsasha928@gmail.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
42 lines
1.3 KiB
Plaintext
42 lines
1.3 KiB
Plaintext
General
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--------
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virtio-console as the name implies is a console over virtio transport. Here is
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a simple head to head comparison of the virtio-console vs regular 8250 console:
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8250 serial console:
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- Requires CONFIG_SERIAL_8250=y and CONFIG_SERIAL_8250_CONSOLE=y kernel configs,
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which are enabled almost everywhere.
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- Doesn't require guest-side changes.
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- Compatible with older guests.
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virtio-console:
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- Requires CONFIG_VIRTIO_CONSOLE=y (along with all other virtio dependencies),
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which got enabled only in recent kernels (but not all of them).
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- Much faster.
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- Consumes less processing resources.
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- Requires guest-side changes.
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Enabling virtio-console
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------------------------
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First, make sure guest kernel is built with CONFIG_VIRTIO_CONSOLE=y. Once this
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is done, the following has to be done inside guest image:
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- Add the following line to /etc/inittab:
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'hvc0:2345:respawn:/sbin/agetty -L 9600 hvc0'
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- Add 'hvc0' to /etc/securetty (so you could actually log on)
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- Start the guest with '--console virtio'
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Common errors
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--------------
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Q: I don't see anything on the screen!
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A: Make sure CONFIG_VIRTIO_CONSOLE=y is enabled in the *guest* kernel, also
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make sure you've updated /etc/inittab
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Q: It won't accept my username/password, but I enter them correctly!
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A: You didn't add 'hvc0' to /etc/securetty
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