Re: [PATCH 3/3] x86/kvm/vmx: avoid expensive rdmsr for MSR_GS_BASE

[Andy Lutomirski]

On Mon, Mar 12, 2018 at 2:03 PM, Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> wrote:
> vmx_save_host_state() is only called from kvm_arch_vcpu_ioctl_run() so
> the context is pretty well defined and as we're past 'swapgs' MSR_GS_BASE
> should contain kernel's GS base which we point to irq_stack_union.
>
> Add new kernelmode_gs_base() API, irq_stack_union needs to be exported
> as KVM can be build as module.
>

Acked-by: Andy Lutomirski <luto@xxxxxxxxxx>