[Xen-changelog] [xen master] x86/svm: Minor cleanup to start_svm()

[patchbot@xxxxxxx]

commit efff60f8be79790a6b195d2b8008da7e6e7716b1
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Mon Nov 25 13:29:20 2019 +0000
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Thu Dec 5 13:19:28 2019 +0000

    x86/svm: Minor cleanup to start_svm()
    
    The function is init, so can use boot_cpu_data directly.
    
    There is no need to write 0 to svm_feature_flags in the case of a CPUID
    mismatch (not least because this is dead code on real hardware), and no need
    to use locked bit operations.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/hvm/svm/svm.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/xen/arch/x86/hvm/svm/svm.c b/xen/arch/x86/hvm/svm/svm.c
index 776cf11459..290bd4c882 100644
--- a/xen/arch/x86/hvm/svm/svm.c
+++ b/xen/arch/x86/hvm/svm/svm.c
@@ -1636,14 +1636,14 @@ const struct hvm_function_table * __init start_svm(void)
 
     setup_vmcb_dump();
 
-    svm_feature_flags = (current_cpu_data.extended_cpuid_level >= 0x8000000A ?
-                         cpuid_edx(0x8000000A) : 0);
+    if ( boot_cpu_data.extended_cpuid_level >= 0x8000000a )
+        svm_feature_flags = cpuid_edx(0x8000000a);
 
     printk("SVM: Supported advanced features:\n");
 
     /* DecodeAssists fast paths assume nextrip is valid for fast rIP update. */
     if ( !cpu_has_svm_nrips )
-        clear_bit(SVM_FEATURE_DECODEASSISTS, &svm_feature_flags);
+        __clear_bit(SVM_FEATURE_DECODEASSISTS, &svm_feature_flags);
 
     if ( cpu_has_tsc_ratio )
         svm_function_table.tsc_scaling.ratio_frac_bits = 32;
--
generated by git-patchbot for /home/xen/git/xen.git#master

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