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    • D
      Add SLOF-based partition firmware for pSeries machine, allowing more boot options · a9f8ad8f
      David Gibson 提交于
      Currently, the emulated pSeries machine requires the use of the
      -kernel parameter in order to explicitly load a guest kernel.  This
      means booting from the virtual disk, cdrom or network is not possible.
      
      This patch addresses this limitation by inserting a within-partition
      firmware image (derived from the "SLOF" free Open Firmware project).
      If -kernel is not specified, qemu will now load the SLOF image, which
      has access to the qemu boot device list through the device tree, and
      can boot from any of the usual virtual devices.
      
      In order to support the new firmware, an extension to the emulated
      machine/hypervisor is necessary.  Unlike Linux, which expects
      multi-CPU entry to be handled kexec() style, the SLOF firmware expects
      only one CPU to be active at entry, and to use a hypervisor RTAS
      method to enable the other CPUs one by one.
      
      This patch also implements this 'start-cpu' method, so that SLOF can
      start the secondary CPUs and marshal them into the kexec() holding
      pattern ready for entry into the guest OS.  Linux should, and in the
      future might directly use the start-cpu method to enable initially
      disabled CPUs, but for now it does require kexec() entry.
      Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
      Signed-off-by: NPaul Mackerras <paulus@samba.org>
      Signed-off-by: NDavid Gibson <dwg@au1.ibm.com>
      Signed-off-by: NAlexander Graf <agraf@suse.de>
      a9f8ad8f
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