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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com> Link: https://lore.kernel.org/qemu-devel/20260612161707.158029-1-kraxel@redhat.com Signed-off-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>
48 lines
1.8 KiB
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48 lines
1.8 KiB
ReStructuredText
.. _direct_005flinux_005fboot:
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Direct Linux Boot
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-----------------
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This section explains how to launch a Linux kernel inside QEMU without
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having to make a full bootable image. It is very useful for fast Linux
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kernel testing.
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The syntax is:
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.. parsed-literal::
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|qemu_system| -kernel bzImage -drive file=rootdisk.img,format=raw -append "root=/dev/sda"
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Use ``-kernel`` to provide the Linux kernel image and ``-append`` to
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give the kernel command line arguments. The ``-initrd`` option can be
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used to provide an INITRD image.
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The ``-shim`` option specifies the ``shim.efi`` binary. This is needed
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when you are booting UEFI firmware and using the ``-kernel`` option to
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tell UEFI to boot a specific kernel image, and the UEFI firmware you
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are booting has UEFI secure boot enabled.
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When this option is specified, the guest UEFI firmware will first
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load, verify and run the shim binary, which is typically signed by
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Microsoft so the firmware accepts it. The shim binary in turn will
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load and verify the Linux kernel. The kernel is typically signed by
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the distro and the certificates needed to verify them are compiled
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into the shim binary, so shim and kernel must come from the same Linux
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distribution.
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Usually you can find shim.efi as ``EFI/BOOT/BOOT{X64,AA64}.EFI`` on
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distro install media. You might find a second shim copy in the
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``EFI/$distro/`` directory.
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If you do not need graphical output, you can disable it and redirect the
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virtual serial port and the QEMU monitor to the console with the
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``-nographic`` option. The typical command line is:
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.. parsed-literal::
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|qemu_system| -kernel bzImage -drive file=rootdisk.img,format=raw \
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-append "root=/dev/sda console=ttyS0" -nographic
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Use :kbd:`Ctrl+a c` to switch between the serial console and the monitor (see
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:ref:`GUI_keys`).
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