On Mon, Jul 23, 2018 at 12:33 PM Sean Christopherson
<sean.j.christopherson@xxxxxxxxx> wrote:
>
> The HOST_{FS,GS}_BASE fields are guaranteed to be written prior to
> VMENTER, by way of vmx_prepare_switch_to_guest(). Initialize the
> fields to zero for 64-bit kernels instead of pulling the base values
> from their respective MSRs. In addition to eliminating two RDMSRs,
> vmx_prepare_switch_to_guest() can safely assume the initial value of
> the fields is zero in all cases.
>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
Reviewed-by: Peter Shier <pshier@xxxxxxxxxx>
Tested-by: Peter Shier <pshier@xxxxxxxxxx>
