KVM: SVM: Enable shadow stack virtualization for SVM

Remove the explicit clearing of shadow stack CPU capabilities.

Reviewed-by: Chao Gao <chao.gao@intel.com>
Signed-off-by: John Allen <john.allen@amd.com>
Link: https://lore.kernel.org/r/20250919223258.1604852-41-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

Author: jallen-amd

arch/x86/kvm/svm/svm.c

@@ -5263,10 +5263,7 @@ static __init void svm_set_cpu_caps(void)
 	kvm_set_cpu_caps();
 
 	kvm_caps.supported_perf_cap = 0;
-	kvm_caps.supported_xss = 0;
 
-	/* KVM doesn't yet support CET virtualization for SVM. */
-	kvm_cpu_cap_clear(X86_FEATURE_SHSTK);
 	kvm_cpu_cap_clear(X86_FEATURE_IBT);
 
 	/* CPUID 0x80000001 and 0x8000000A (SVM features) */