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Fri, 23 Feb 2024 04:06:32 -0800 (PST) From: Roger Pau Monne To: xen-devel@lists.xenproject.org Cc: Roger Pau Monne , Jan Beulich , Andrew Cooper , Wei Liu Subject: [PATCH v2 2/3] x86/spec: fix BRANCH_HARDEN option to only be set when build-enabled Date: Fri, 23 Feb 2024 13:06:15 +0100 Message-ID: <20240223120616.73503-3-roger.pau@citrix.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240223120616.73503-1-roger.pau@citrix.com> References: <20240223120616.73503-1-roger.pau@citrix.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1708690015473100002 The current logic to handle the BRANCH_HARDEN option will report it as enab= led even when build-time disabled. Fix this by only allowing the option to be s= et when support for it is built into Xen. Fixes: 2d6f36daa086 ('x86/nospec: Introduce CONFIG_SPECULATIVE_HARDEN_BRANC= H') Signed-off-by: Roger Pau Monn=C3=A9 --- Changes since v1: - Use no_config_param(). --- xen/arch/x86/spec_ctrl.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/xen/arch/x86/spec_ctrl.c b/xen/arch/x86/spec_ctrl.c index 421fe3f640df..4ce8a7a0b8ef 100644 --- a/xen/arch/x86/spec_ctrl.c +++ b/xen/arch/x86/spec_ctrl.c @@ -50,7 +50,8 @@ static int8_t __initdata opt_psfd =3D -1; int8_t __ro_after_init opt_ibpb_ctxt_switch =3D -1; int8_t __read_mostly opt_eager_fpu =3D -1; int8_t __read_mostly opt_l1d_flush =3D -1; -static bool __initdata opt_branch_harden =3D true; +static bool __initdata opt_branch_harden =3D + IS_ENABLED(CONFIG_SPECULATIVE_HARDEN_BRANCH); =20 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 =3D parse_boolean("l1d-flush", s, ss)) >=3D 0 ) opt_l1d_flush =3D val; else if ( (val =3D parse_boolean("branch-harden", s, ss)) >=3D 0 ) + { +#ifdef CONFIG_SPECULATIVE_HARDEN_BRANCH opt_branch_harden =3D val; +#else + no_config_param("SPECULATIVE_HARDEN_BRANCH", "spec-ctrl", s, s= s); + rc =3D -EINVAL; +#endif + } else if ( (val =3D parse_boolean("srb-lock", s, ss)) >=3D 0 ) opt_srb_lock =3D val; else if ( (val =3D parse_boolean("unpriv-mmio", s, ss)) >=3D 0 ) --=20 2.43.0