• Sean Christopherson's avatar
    KVM: VMX: Add proper cache tracking for CR4 · f98c1e77
    Sean Christopherson authored
    Move CR4 caching into the standard register caching mechanism in order
    to take advantage of the availability checks provided by regs_avail.
    This avoids multiple VMREADs and retpolines (when configured) during
    nested VMX transitions as kvm_read_cr4_bits() is invoked multiple times
    on each transition, e.g. when stuffing CR0 and CR3.
    
    As an added bonus, this eliminates a kvm_x86_ops hook, saves a retpoline
    on SVM when reading CR4, and squashes the confusing naming discrepancy
    of "cache_reg" vs. "decache_cr4_guest_bits".
    
    No functional change intended.
    Signed-off-by: default avatarSean Christopherson <sean.j.christopherson@intel.com>
    Message-Id: <20200502043234.12481-7-sean.j.christopherson@intel.com>
    Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
    f98c1e77
svm.c 108 KB