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    Subject[PATCH 09/15] KVM: SVM: Remove the unneeded code to mark available for CR3
    Date
    From: Lai Jiangshan <laijs@linux.alibaba.com>

    VCPU_EXREG_CR3 is never cleared from vcpu->arch.regs_avail in SVM so
    marking available for CR3 is mere an NOP, just remove it.

    And it is not required to mark it dirty since VCPU_EXREG_CR3 is neither
    never cleared from vcpu->arch.regs_dirty and SVM doesn't use the dirty
    information of VCPU_EXREG_CR3.

    Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
    ---
    arch/x86/kvm/svm/nested.c | 1 -
    1 file changed, 1 deletion(-)

    diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
    index 13a58722e097..2d88ff584d61 100644
    --- a/arch/x86/kvm/svm/nested.c
    +++ b/arch/x86/kvm/svm/nested.c
    @@ -444,7 +444,6 @@ static int nested_svm_load_cr3(struct kvm_vcpu *vcpu, unsigned long cr3,
    kvm_mmu_new_pgd(vcpu, cr3);

    vcpu->arch.cr3 = cr3;
    - kvm_register_mark_available(vcpu, VCPU_EXREG_CR3);

    /* Re-initialize the MMU, e.g. to pick up CR4 MMU role changes. */
    kvm_init_mmu(vcpu);
    --
    2.19.1.6.gb485710b
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