[Xen-devel] [PATCH] x86: report use of PCID together with reporting XPTI status

["Jan Beulich" <JBeulich@xxxxxxxx>]

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/x86/pv/domain.c
+++ b/xen/arch/x86/pv/domain.c
@@ -288,6 +288,12 @@ int pv_domain_initialise(struct domain *
     return rc;
 }
 
+bool __init xpti_pcid_enabled(void)
+{
+    return use_invpcid && cpu_has_pcid &&
+           (opt_pcid == PCID_ALL || opt_pcid == PCID_XPTI);
+}
+
 static void _toggle_guest_pt(struct vcpu *v)
 {
     const struct domain *d = v->domain;
--- a/xen/arch/x86/spec_ctrl.c
+++ b/xen/arch/x86/spec_ctrl.c
@@ -256,9 +256,10 @@ static void __init print_details(enum in
            boot_cpu_has(X86_FEATURE_SC_RSB_HVM)      ? " RSB"           : "",
            opt_eager_fpu                             ? " EAGER_FPU"     : "");
 
-    printk("  XPTI (64-bit PV only): Dom0 %s, DomU %s\n",
+    printk("  XPTI (64-bit PV only): Dom0 %s, DomU %s (with%s PCID)\n",
            opt_xpti & OPT_XPTI_DOM0 ? "enabled" : "disabled",
-           opt_xpti & OPT_XPTI_DOMU ? "enabled" : "disabled");
+           opt_xpti & OPT_XPTI_DOMU ? "enabled" : "disabled",
+           xpti_pcid_enabled() ? "" : "out");
 }
 
 /* Calculate whether Retpoline is known-safe on this CPU. */
--- a/xen/include/asm-x86/spec_ctrl.h
+++ b/xen/include/asm-x86/spec_ctrl.h
@@ -38,6 +38,8 @@ extern uint8_t opt_xpti;
 #define OPT_XPTI_DOM0  0x01
 #define OPT_XPTI_DOMU  0x02
 
+bool xpti_pcid_enabled(void);
+
 static inline void init_shadow_spec_ctrl_state(void)
 {
     struct cpu_info *info = get_cpu_info();





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