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    Subject[PATCH 27/41] KVM: Don't allow the guest to turn off the cpu cache
    Date
    The cpu cache is a host resource; the guest should not be able to turn
    it off (even for itself).

    Signed-off-by: Avi Kivity <avi@qumranet.com>
    ---
    drivers/kvm/svm.c | 4 +++-
    1 files changed, 3 insertions(+), 1 deletions(-)

    diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c
    index d3cc115..191bc45 100644
    --- a/drivers/kvm/svm.c
    +++ b/drivers/kvm/svm.c
    @@ -737,8 +737,10 @@ static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
    }
    #endif
    vcpu->svm->cr0 = cr0;
    - vcpu->svm->vmcb->save.cr0 = cr0 | CR0_PG_MASK | CR0_WP_MASK;
    vcpu->cr0 = cr0;
    + cr0 |= CR0_PG_MASK | CR0_WP_MASK;
    + cr0 &= ~(CR0_CD_MASK | CR0_NW_MASK);
    + vcpu->svm->vmcb->save.cr0 = cr0;
    }

    static void svm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
    --
    1.5.0.5
    -
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