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[Xen-devel] [PATCH v5] Speculative mitigation facilities report wrong status

To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>

From: Jin Nan Wang <jnwang@xxxxxxxx>

Date: Wed, 31 Jul 2019 13:33:44 +0000

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Cc: "andrew.cooper3@xxxxxxxxxx" <andrew.cooper3@xxxxxxxxxx>, Jin Nan Wang <jnwang@xxxxxxxx>, "wl@xxxxxxx" <wl@xxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, "roger.pau@xxxxxxxxxx" <roger.pau@xxxxxxxxxx>

Delivery-date: Wed, 31 Jul 2019 13:44:37 +0000

List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

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Thread-topic: [PATCH v5] Speculative mitigation facilities report wrong status

Booting with spec-ctrl=0 results in Xen printing "None MD_CLEAR". (XEN) Support for HVM VMs: None MD_CLEAR (XEN) Support for PV VMs: None MD_CLEAR Add a check about X86_FEATURE_MD_CLEAR to avoid to print "None". Signed-off-by: James Wang <jnwang@xxxxxxxx> --- xen/arch/x86/spec_ctrl.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/xen/arch/x86/spec_ctrl.c b/xen/arch/x86/spec_ctrl.c index cada9a058e..468a847598 100644 --- a/xen/arch/x86/spec_ctrl.c +++ b/xen/arch/x86/spec_ctrl.c @@ -366,6 +366,7 @@ static void __init print_details(enum ind_thunk thunk, uint64_t caps) printk(" Support for HVM VMs:%s%s%s%s%s\n", (boot_cpu_has(X86_FEATURE_SC_MSR_HVM) || boot_cpu_has(X86_FEATURE_SC_RSB_HVM) || + boot_cpu_has(X86_FEATURE_MD_CLEAR) || opt_eager_fpu) ? "" : " None", boot_cpu_has(X86_FEATURE_SC_MSR_HVM) ? " MSR_SPEC_CTRL" : "", boot_cpu_has(X86_FEATURE_SC_RSB_HVM) ? " RSB" : "", @@ -377,6 +378,7 @@ static void __init print_details(enum ind_thunk thunk, uint64_t caps) printk(" Support for PV VMs:%s%s%s%s%s\n", (boot_cpu_has(X86_FEATURE_SC_MSR_PV) || boot_cpu_has(X86_FEATURE_SC_RSB_PV) || + boot_cpu_has(X86_FEATURE_MD_CLEAR) || opt_eager_fpu) ? "" : " None", boot_cpu_has(X86_FEATURE_SC_MSR_PV) ? " MSR_SPEC_CTRL" : "", boot_cpu_has(X86_FEATURE_SC_RSB_PV) ? " RSB" : "", -- 2.22.0 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel

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