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

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Date:   Fri, 23 Jun 2017 09:35:44 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Andy Lutomirski <luto@...nel.org>, x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, Borislav Petkov <bp@...en8.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...e.de>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Nadav Amit <nadav.amit@...il.com>,
        Rik van Riel <riel@...hat.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juergen Gross <jgross@...e.com>
Subject: Re: [PATCH v3 10/11] x86/mm: Enable CR4.PCIDE on supported systems


> 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.ostrovsky@...cle.com>