From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755895AbdBQHgg (ORCPT ); Fri, 17 Feb 2017 02:36:36 -0500 Received: from mx2.suse.de ([195.135.220.15]:59365 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755588AbdBQHge (ORCPT ); Fri, 17 Feb 2017 02:36:34 -0500 From: Juergen Gross To: linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org, x86@kernel.org Cc: boris.ostrovsky@oracle.com, hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com, Juergen Gross Subject: [PATCH 1/2] x86/xen: don't indicate DCA support in pv domains Date: Fri, 17 Feb 2017 08:36:24 +0100 Message-Id: <20170217073625.13418-2-jgross@suse.com> X-Mailer: git-send-email 2.10.2 In-Reply-To: <20170217073625.13418-1-jgross@suse.com> References: <20170217073625.13418-1-jgross@suse.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Xen doesn't support DCA (direct cache access) for pv domains. Clear the corresponding capability indicator. Signed-off-by: Juergen Gross --- arch/x86/xen/enlighten.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index 51ef952..83399ce 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -461,6 +461,9 @@ static void __init xen_init_cpuid_mask(void) cpuid_leaf1_ecx_mask &= ~xsave_mask; /* disable XSAVE & OSXSAVE */ if (xen_check_mwait()) cpuid_leaf1_ecx_set_mask = (1 << (X86_FEATURE_MWAIT % 32)); + + /* Disable DCA feature. */ + setup_clear_cpu_cap(X86_FEATURE_DCA); } static void xen_set_debugreg(int reg, unsigned long val) -- 2.10.2