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Re: [PATCH v2 2/3] x86/spec: fix BRANCH_HARDEN option to only be set when build-enabled
- To: Roger Pau Monne <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 26 Feb 2024 09:42:58 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 26 Feb 2024 08:43:02 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 23.02.2024 13:06, Roger Pau Monne wrote:
> --- a/xen/arch/x86/spec_ctrl.c
> +++ b/xen/arch/x86/spec_ctrl.c
> @@ -50,7 +50,8 @@ static int8_t __initdata opt_psfd = -1;
> int8_t __ro_after_init opt_ibpb_ctxt_switch = -1;
> int8_t __read_mostly opt_eager_fpu = -1;
> int8_t __read_mostly opt_l1d_flush = -1;
> -static bool __initdata opt_branch_harden = true;
> +static bool __initdata opt_branch_harden =
> + IS_ENABLED(CONFIG_SPECULATIVE_HARDEN_BRANCH);
>
> bool __initdata bsp_delay_spec_ctrl;
> uint8_t __read_mostly default_xen_spec_ctrl;
> @@ -268,7 +269,14 @@ static int __init cf_check parse_spec_ctrl(const char *s)
> else if ( (val = parse_boolean("l1d-flush", s, ss)) >= 0 )
> opt_l1d_flush = val;
> else if ( (val = parse_boolean("branch-harden", s, ss)) >= 0 )
> + {
> +#ifdef CONFIG_SPECULATIVE_HARDEN_BRANCH
> opt_branch_harden = val;
> +#else
> + no_config_param("SPECULATIVE_HARDEN_BRANCH", "spec-ctrl", s, ss);
> + rc = -EINVAL;
> +#endif
> + }
> else if ( (val = parse_boolean("srb-lock", s, ss)) >= 0 )
> opt_srb_lock = val;
> else if ( (val = parse_boolean("unpriv-mmio", s, ss)) >= 0 )
While looking at patch 3 I noticed another inconsistency: Wouldn't
"Compiled-in support:" better also enumerate HARDEN_BRANCH then, just
like for thunks both CONFIG_* state and actual runtime choice are
logged? Or alternatively, should logging of thunk runtime choice be
suppressed when the Kconfig setting is off?
Jan
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