Speculative mitigation facilities report wrong status V4

[Xen-devel] [PATCH] Speculative mitigation facilities report wrong status V4

Jin Nan Wang posted 1 patch 4 years, 8 months ago

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git fetch https://github.com/patchew-project/xen tags/patchew/20190731133214.22790-1-jnwang@suse.com

xen/arch/x86/spec_ctrl.c | 2 ++
1 file changed, 2 insertions(+)

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[Xen-devel] [PATCH] Speculative mitigation facilities report wrong status V4

Posted by Jin Nan Wang 4 years, 8 months ago

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@suse.com>
---
 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


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