[xen staging] x86/PV: guard svm specific functions with using_svm() check

[patchbot@xxxxxxx]

commit 23bb8addf28b9f405aaa3a07aa840b2856340e41
Author:     Xenia Ragiadakou <burzalodowa@xxxxxxxxx>
AuthorDate: Thu Aug 1 13:57:09 2024 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Aug 1 13:57:09 2024 +0200

    x86/PV: guard svm specific functions with using_svm() check
    
    Replace cpu_has_svm check with using_svm(), so that not only SVM support in 
CPU
    is being checked at runtime, but also at build time we ensure the 
availability
    of functions svm_load_segs() and svm_load_segs_prefetch().
    
    Since SVM depends on HVM, it can be used alone.
    
    Signed-off-by: Xenia Ragiadakou <burzalodowa@xxxxxxxxx>
    Signed-off-by: Sergiy Kibrik <Sergiy_Kibrik@xxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/domain.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index c71b9023cb..d977ec71ca 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -1720,11 +1720,9 @@ static void load_segments(struct vcpu *n)
         if ( !(n->arch.flags & TF_kernel_mode) )
             SWAP(gsb, gss);
 
-#ifdef CONFIG_HVM
-        if ( cpu_has_svm && (uregs->fs | uregs->gs) <= 3 )
+        if ( using_svm() && (uregs->fs | uregs->gs) <= 3 )
             fs_gs_done = svm_load_segs(n->arch.pv.ldt_ents, LDT_VIRT_START(n),
                                        n->arch.pv.fs_base, gsb, gss);
-#endif
     }
 
     if ( !fs_gs_done )
@@ -2037,9 +2035,9 @@ static void __context_switch(void)
 
     write_ptbase(n);
 
-#if defined(CONFIG_PV) && defined(CONFIG_HVM)
+#ifdef CONFIG_PV
     /* Prefetch the VMCB if we expect to use it later in the context switch */
-    if ( cpu_has_svm && is_pv_64bit_domain(nd) && !is_idle_domain(nd) )
+    if ( using_svm() && is_pv_64bit_domain(nd) && !is_idle_domain(nd) )
         svm_load_segs_prefetch();
 #endif
 
--
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