On 25/09/2017 06:44, Wei Wang wrote:
>
> +static void update_msr_autoload_count_max(void)
> +{
> + u64 vmx_msr;
> + int n;
> +
> + /*
> + * According to the Intel SDM, if Bits 27:25 of MSR_IA32_VMX_MISC is
> + * n, then (n + 1) * 512 is the recommended max number of MSRs to be
> + * included in the VMExit and VMEntry MSR auto switch list.
> + */
> + rdmsrl(MSR_IA32_VMX_MISC, vmx_msr);
> + n = ((vmx_msr & 0xe000000) >> 25) + 1;
> + msr_autoload_count_max = n * KVM_VMX_DEFAULT_MSR_AUTO_LOAD_COUNT;
> +}
> +
Any reasons to do this if it's unlikely that we'll ever update more than
512 MSRs?
Paolo
