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charset="utf-8" Signed-off-by: Gerd Hoffmann Reviewed-by: Peter Maydell Reviewed-by: Pierrick Bouvier --- docs/system/linuxboot.rst | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/docs/system/linuxboot.rst b/docs/system/linuxboot.rst index f7573ab80a..c787481ccc 100644 --- a/docs/system/linuxboot.rst +++ b/docs/system/linuxboot.rst @@ -17,6 +17,23 @@ Use ``-kernel`` to provide the Linux kernel image and ``= -append`` to give the kernel command line arguments. The ``-initrd`` option can be used to provide an INITRD image. =20 +The ``-shim`` option specifies the ``shim.efi`` binary. This is needed +when you are booting UEFI firmware and using the ``-kernel`` option to +tell UEFI to boot a specific kernel image, and the UEFI firmware you +are booting has UEFI secure boot enabled. + +When this option is specified, the guest UEFI firmware will first +load, verify and run the shim binary, which is typically signed by +Microsoft so the firmware accepts it. The shim binary in turn will +load and verify the Linux kernel. The kernel is typically signed by +the distro and the certificates needed to verify them are compiled +into the shim binary, so shim + kernel must come from the same Linux +distribution. + +Usually you can find shim.efi as ``EFI/BOOT/BOOT{X64,AA64}.EFI`` on +distro install media. You might find a second shim copy in the +``EFI/$distro/`` directory. + If you do not need graphical output, you can disable it and redirect the virtual serial port and the QEMU monitor to the console with the ``-nographic`` option. The typical command line is: --=20 2.54.0