• Paolo Bonzini's avatar
    Revert "KVM: Support vCPU-based gfn->hva cache" · 4e335d9e
    Paolo Bonzini authored
    This reverts commit bbd64115.
    
    I've been sitting on this revert for too long and it unfortunately
    missed 4.11.  It's also the reason why I haven't merged ring-based
    dirty tracking for 4.12.
    
    Using kvm_vcpu_memslots in kvm_gfn_to_hva_cache_init and
    kvm_vcpu_write_guest_offset_cached means that the MSR value can
    now be used to access SMRAM, simply by making it point to an SMRAM
    physical address.  This is problematic because it lets the guest
    OS overwrite memory that it shouldn't be able to touch.
    
    Cc: stable@vger.kernel.org
    Fixes: bbd64115Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
    4e335d9e
x86.c 222 KB