>>> On 04.01.18 at 01:15, <andrew.coop...@citrix.com> wrote:
> @@ -31,11 +32,12 @@ enum ind_thunk {
> THUNK_LFENCE,
> THUNK_JMP,
> } opt_thunk __initdata = THUNK_DEFAULT;
> +int opt_ibrs __initdata = -1;
static
> @@ -147,6 +230,18 @@ void __init init_speculation_mitigations(void)
> else if ( thunk == THUNK_JMP )
> setup_force_cpu_cap(X86_FEATURE_IND_THUNK_JMP);
>
> + /*
> + * Even if we've chosen not to use IBRS for Xen itself, we still need the
> + * IBRS entry/exit logic to virtualise IBRS support for guests.
> + */
> + if ( boot_cpu_has(X86_FEATURE_IBRSB) )
> + {
> + if ( ibrs )
> + setup_force_cpu_cap(X86_FEATURE_XEN_IBRS_SET);
> + else
> + setup_force_cpu_cap(X86_FEATURE_XEN_IBRS_CLEAR);
> + }
You've already indicated you would try to change the comment,
for it to not be misleading the way it's currently placed.
Jan
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