• Hypervisors like KVM perform badly while doing mmio on
    a loop, because it'll generate an exit on each access.
    This is the case with VGA, which results in very bad
    performance.
    
    In this patch, we map the linear frame buffer as RAM,
    make sure it has dirty region tracking enabled, and then
    just let the region to be written.
    
    Cleanups suggestions by:
      Stefano Stabellini <stefano.stabellini@eu.citrix.com>
    
    Signed-off-by: Glauber Costa <glommer@redhat.com>
    Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
    
    
    
    git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5793 c046a42c-6fe2-441c-8c8c-71466251a162
    aliguori authored
     
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  • This patch adds very basic KVM support.  KVM is a kernel module for Linux that
    allows userspace programs to make use of hardware virtualization support.  It
    current supports x86 hardware virtualization using Intel VT-x or AMD-V.  It
    also supports IA64 VT-i, PPC 440, and S390.
    
    This patch only implements the bare minimum support to get a guest booting.  It
    has very little impact the rest of QEMU and attempts to integrate nicely with
    the rest of QEMU.
    
    Even though this implementation is basic, it is significantly faster than TCG.
    Booting and shutting down a Linux guest:
    
    w/TCG:  1:32.36 elapsed  84% CPU
    
    w/KVM:  0:31.14 elapsed  59% CPU
    
    Right now, KVM is disabled by default and must be explicitly enabled with
     -enable-kvm.  We can enable it by default later when we have had better
    testing.
    
    Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
    
    
    
    git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5627 c046a42c-6fe2-441c-8c8c-71466251a162
    aliguori authored
     
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