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    Subject[PATCH 5.2 47/85] KVM: nVMX: handle page fault in vmread
    Date
    From: Paolo Bonzini <pbonzini@redhat.com>

    commit f7eea636c3d505fe6f1d1066234f1aaf7171b681 upstream.

    The implementation of vmread to memory is still incomplete, as it
    lacks the ability to do vmread to I/O memory just like vmptrst.

    Cc: stable@vger.kernel.org
    Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    arch/x86/kvm/vmx/nested.c | 4 +++-
    1 file changed, 3 insertions(+), 1 deletion(-)

    --- a/arch/x86/kvm/vmx/nested.c
    +++ b/arch/x86/kvm/vmx/nested.c
    @@ -4411,6 +4411,7 @@ static int handle_vmread(struct kvm_vcpu
    int len;
    gva_t gva = 0;
    struct vmcs12 *vmcs12;
    + struct x86_exception e;

    if (!nested_vmx_check_permission(vcpu))
    return 1;
    @@ -4451,7 +4452,8 @@ static int handle_vmread(struct kvm_vcpu
    vmx_instruction_info, true, len, &gva))
    return 1;
    /* _system ok, nested_vmx_check_permission has verified cpl=0 */
    - kvm_write_guest_virt_system(vcpu, gva, &field_value, len, NULL);
    + if (kvm_write_guest_virt_system(vcpu, gva, &field_value, len, &e))
    + kvm_inject_page_fault(vcpu, &e);
    }

    return nested_vmx_succeed(vcpu);

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