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    Subject[PATCH 14/29] KVM: X86: Add kvm_read_guest_page_mmu function
    Date
    This patch adds a function which can read from the guests
    physical memory or from the guest's guest physical memory.
    This will be used in the two-dimensional page table walker.

    Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
    ---
    arch/x86/include/asm/kvm_host.h | 3 +++
    arch/x86/kvm/x86.c | 23 +++++++++++++++++++++++
    2 files changed, 26 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
    index 10a5ddd..5d9e0bb 100644
    --- a/arch/x86/include/asm/kvm_host.h
    +++ b/arch/x86/include/asm/kvm_host.h
    @@ -657,6 +657,9 @@ void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code);
    void kvm_requeue_exception(struct kvm_vcpu *vcpu, unsigned nr);
    void kvm_requeue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code);
    void kvm_inject_page_fault(struct kvm_vcpu *vcpu);
    +int kvm_read_guest_page_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
    + gfn_t gfn, void *data, int offset, int len,
    + u32 access);
    bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl);

    int kvm_pic_set_irq(void *opaque, int irq, int level);
    diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
    index 1054519..34bc840 100644
    --- a/arch/x86/kvm/x86.c
    +++ b/arch/x86/kvm/x86.c
    @@ -370,6 +370,29 @@ bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl)
    EXPORT_SYMBOL_GPL(kvm_require_cpl);

    /*
    + * This function will be used to read from the physical memory of the currently
    + * running guest. The difference to kvm_read_guest_page is that this function
    + * can read from guest physical or from the guest's guest physical memory.
    + */
    +int kvm_read_guest_page_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
    + gfn_t ngfn, void *data, int offset, int len,
    + u32 access)
    +{
    + gfn_t real_gfn;
    + gpa_t ngpa;
    +
    + ngpa = gfn_to_gpa(ngfn);
    + real_gfn = mmu->translate_gpa(vcpu, ngpa, access);
    + if (real_gfn == UNMAPPED_GVA)
    + return -EFAULT;
    +
    + real_gfn = gpa_to_gfn(real_gfn);
    +
    + return kvm_read_guest_page(vcpu->kvm, real_gfn, data, offset, len);
    +}
    +EXPORT_SYMBOL_GPL(kvm_read_guest_page_mmu);
    +
    +/*
    * Load the pae pdptrs. Return true is they are all valid.
    */
    int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
    --
    1.7.0.4



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