• Since most IO devices are integrated into the 440EP chip, "Bamboo support"
    mostly entails implementing the -kernel, -initrd, and -append options.
    
    These options are implemented by loading the guest as if u-boot had done it,
    i.e. loading a flat device tree, updating it to hold initrd addresses, ram
    size, and command line, and passing the FDT address in r3.
    
    Since we use it with KVM, we enable the virtio block driver and include hooks
    necessary for KVM support.
    
    Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
    Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
    
    git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6067 c046a42c-6fe2-441c-8c8c-71466251a162
    aurel32 authored
     
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  • Wire up the system-on-chip devices present on 440EP chips.
    
    This patch is a little unusual in that qemu doesn't actually emulate the 440
    core, but we use this board code with KVM (which does). If/when 440 core
    emulation is supported, the kvm_enabled() hack can be removed.
    
    Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
    Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
    
    git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6066 c046a42c-6fe2-441c-8c8c-71466251a162
    aurel32 authored
     
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  • MMIO exits are more expensive in KVM or Xen than in QEMU because they 
    involve, at least, privilege transitions.  However, MMIO write 
    operations can be effectively batched if those writes do not have side 
    effects.
    
    Good examples of this include VGA pixel operations when in a planar 
    mode.  As it turns out, we can get a nice boost in other areas too.  
    Laurent mentioned a 9.7% performance boost in iperf with the coalesced 
    MMIO changes for the e1000 when he originally posted this work for KVM.
    
    Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
    
    
    
    git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5961 c046a42c-6fe2-441c-8c8c-71466251a162
    aliguori authored
     
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