• James Hogan's avatar
    KVM: MIPS/Entry: Update entry code to support VZ · 1934a3ad
    James Hogan authored
    Update MIPS KVM entry code to support VZ:
    
     - We need to set GuestCtl0.GM while in guest mode.
    
     - For cores supporting GuestID, we need to set the root GuestID to
       match the main GuestID while in guest mode so that the root TLB
       refill handler writes the correct GuestID into the TLB.
    
     - For cores without GuestID where the root ASID dealiases RVA/GPA
       mappings, we need to load that ASID from the gpa_mm rather than the
       per-VCPU guest_kernel_mm or guest_user_mm, since the root TLB maps
       guest physical addresses. We also need to restore the normal process
       ASID on exit.
    
     - The normal linux process pgd needs restoring on exit, as we can't
       leave the GPA mappings active for kernel code.
    
     - GuestCtl0 needs saving on exit for the GExcCode field, as it may be
       clobbered if a preemption occurs.
    
    We also need to move the TLB refill handler to the XTLB vector at offset
    0x80 on 64-bit VZ kernels, as hardware will use Root.Status.KX to
    determine whether a TLB refill or XTLB Refill exception is to be taken
    on a root TLB miss from guest mode, and KX needs to be set for kernel
    code to be able to access the 64-bit segments.
    Signed-off-by: default avatarJames Hogan <james.hogan@imgtec.com>
    Cc: Paolo Bonzini <pbonzini@redhat.com>
    Cc: "Radim Krčmář" <rkrcmar@redhat.com>
    Cc: Ralf Baechle <ralf@linux-mips.org>
    Cc: linux-mips@linux-mips.org
    Cc: kvm@vger.kernel.org
    1934a3ad
kvm_host.h 34.1 KB