[Xen-changelog] [xen staging] xen/spec-ctrl: Speculative mitigation facilities report wrong status

[patchbot@xxxxxxx]

commit 2adc580bd59f5c3034fd6ecacd5748678373f17a
Author:     Jin Nan Wang <jnwang@xxxxxxxx>
AuthorDate: Wed Jul 31 13:33:44 2019 +0000
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Wed Jul 31 14:53:13 2019 +0100

    xen/spec-ctrl: 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>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 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"           : "",
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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