• Scott Wood's avatar
    KVM: PPC: booke: category E.HV (GS-mode) support · d30f6e48
    Scott Wood authored
    Chips such as e500mc that implement category E.HV in Power ISA 2.06
    provide hardware virtualization features, including a new MSR mode for
    guest state.  The guest OS can perform many operations without trapping
    into the hypervisor, including transitions to and from guest userspace.
    
    Since we can use SRR1[GS] to reliably tell whether an exception came from
    guest state, instead of messing around with IVPR, we use DO_KVM similarly
    to book3s.
    
    Current issues include:
     - Machine checks from guest state are not routed to the host handler.
     - The guest can cause a host oops by executing an emulated instruction
       in a page that lacks read permission.  Existing e500/4xx support has
       the same problem.
    
    Includes work by Ashish Kalra <Ashish.Kalra@freescale.com>,
    Varun Sethi <Varun.Sethi@freescale.com>, and
    Liu Yu <yu.liu@freescale.com>.
    Signed-off-by: default avatarScott Wood <scottwood@freescale.com>
    [agraf: remove pt_regs usage]
    Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
    Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
    d30f6e48
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