Re: [PATCH v3 10/11] x86/mm: Enable CR4.PCIDE on supported systems

[Boris Ostrovsky]

diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index f33eef4ebd12..a136aac543c3 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -295,6 +295,12 @@ static void __init xen_init_capabilities(void)
        setup_clear_cpu_cap(X86_FEATURE_ACC);
        setup_clear_cpu_cap(X86_FEATURE_X2APIC);

+ /*

+        * Xen PV would need some work to support PCID: CR3 handling as well
+        * as xen_flush_tlb_others() would need updating.
+        */
+       setup_clear_cpu_cap(X86_FEATURE_PCID);
+
        if (!xen_initial_domain())
                setup_clear_cpu_cap(X86_FEATURE_ACPI);

Reviewed-by: Boris Ostrovsky <boris.ostrov...@oracle.com>