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    Subject[PATCH 4.19 24/50] 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.c | 7 +++++--
    1 file changed, 5 insertions(+), 2 deletions(-)

    --- a/arch/x86/kvm/vmx.c
    +++ b/arch/x86/kvm/vmx.c
    @@ -8757,6 +8757,7 @@ static int handle_vmread(struct kvm_vcpu
    u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
    gva_t gva = 0;
    struct vmcs12 *vmcs12;
    + struct x86_exception e;

    if (!nested_vmx_check_permission(vcpu))
    return 1;
    @@ -8798,8 +8799,10 @@ static int handle_vmread(struct kvm_vcpu
    vmx_instruction_info, true, &gva))
    return 1;
    /* _system ok, nested_vmx_check_permission has verified cpl=0 */
    - kvm_write_guest_virt_system(vcpu, gva, &field_value,
    - (is_long_mode(vcpu) ? 8 : 4), NULL);
    + if (kvm_write_guest_virt_system(vcpu, gva, &field_value,
    + (is_long_mode(vcpu) ? 8 : 4),
    + NULL))
    + kvm_inject_page_fault(vcpu, &e);
    }

    nested_vmx_succeed(vcpu);

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