>>> On 16.12.15 at 22:24, <andrew.coop...@citrix.com> wrote:
> @@ -22,6 +24,27 @@ void __init calculate_featuresets(void)
>
> /* Unconditionally claim to be able to set the hypervisor bit. */
> __set_bit(X86_FEATURE_HYPERVISOR, pv_featureset);
> +
> + /* HVM featureset. */
> + if ( hvm_enabled )
> + {
> + const uint32_t *hvm_featuremask = hvm_funcs.hap_supported
> + ? hvm_hap_featuremask : hvm_shadow_featuremask;
> +
> + for ( i = 0; i < ARRAY_SIZE(hvm_featureset); ++i )
> + hvm_featureset[i] = host_featureset[i] & hvm_featuremask[i];
> +
> + /* Unconditionally claim to be able to set the hypervisor bit. */
> + __set_bit(X86_FEATURE_HYPERVISOR, hvm_featureset);
> +
> + /*
> + * On AMD, PV guests are entirely unable to use 'sysenter' as Xen
> runs
> + * in long mode, but HVM guests are able if running in protected
> mode.
> + */
> + if ( (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) &&
> + !test_bit(X86_FEATURE_SEP, boot_cpu_data.x86_capability) )
Is the ! correct here? And please use cpu_has_sep.
Jan
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