From patchwork Fri Aug 9 16:00:40 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Adalbert_Laz=C4=83r?= X-Patchwork-Id: 11087031 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 20C05112C for ; Fri, 9 Aug 2019 16:15:12 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0EED91FF28 for ; Fri, 9 Aug 2019 16:15:12 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 03507201F3; Fri, 9 Aug 2019 16:15:12 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B8D0E1FF28 for ; Fri, 9 Aug 2019 16:15:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2437187AbfHIQPL (ORCPT ); Fri, 9 Aug 2019 12:15:11 -0400 Received: from mx01.bbu.dsd.mx.bitdefender.com ([91.199.104.161]:52918 "EHLO mx01.bbu.dsd.mx.bitdefender.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2437127AbfHIQPH (ORCPT ); Fri, 9 Aug 2019 12:15:07 -0400 Received: from smtp.bitdefender.com (smtp02.buh.bitdefender.net [10.17.80.76]) by mx01.bbu.dsd.mx.bitdefender.com (Postfix) with ESMTPS id AFF0D305D364; Fri, 9 Aug 2019 19:01:41 +0300 (EEST) Received: from localhost.localdomain (unknown [89.136.169.210]) by smtp.bitdefender.com (Postfix) with ESMTPSA id 67CE6305B7A1; Fri, 9 Aug 2019 19:01:41 +0300 (EEST) From: =?utf-8?q?Adalbert_Laz=C4=83r?= To: kvm@vger.kernel.org Cc: linux-mm@kvack.org, virtualization@lists.linux-foundation.org, Paolo Bonzini , =?utf-8?b?UmFkaW0gS3LEjW3DocWZ?= , Konrad Rzeszutek Wilk , Tamas K Lengyel , Mathieu Tarral , =?utf-8?q?Samuel_Laur=C3=A9?= =?utf-8?q?n?= , Patrick Colp , Jan Kiszka , Stefan Hajnoczi , Weijiang Yang , Zhang@vger.kernel.org, Yu C , =?utf-8?q?Mihai_Don=C8=9Bu?= , =?utf-8?q?Adalbert_L?= =?utf-8?q?az=C4=83r?= Subject: [RFC PATCH v6 85/92] kvm: x86: emulate lfence Date: Fri, 9 Aug 2019 19:00:40 +0300 Message-Id: <20190809160047.8319-86-alazar@bitdefender.com> In-Reply-To: <20190809160047.8319-1-alazar@bitdefender.com> References: <20190809160047.8319-1-alazar@bitdefender.com> MIME-Version: 1.0 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Mihai Donțu This adds support for all encoding variants of lfence (0x0f 0xae 0xe[8-f]). I did not use rmb() in case it will be made to use a different instruction on future architectures. Signed-off-by: Mihai Donțu Signed-off-by: Adalbert Lazăr --- arch/x86/kvm/emulate.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index a2e5e63bd94a..287d3751675d 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -4168,6 +4168,12 @@ static int em_fxrstor(struct x86_emulate_ctxt *ctxt) return rc; } +static int em_lfence(struct x86_emulate_ctxt *ctxt) +{ + asm volatile ("lfence" ::: "memory"); + return X86EMUL_CONTINUE; +} + static bool valid_cr(int nr) { switch (nr) { @@ -4554,7 +4560,7 @@ static const struct group_dual group15 = { { I(ModRM | Aligned16, em_fxrstor), N, N, N, N, N, GP(0, &pfx_0f_ae_7), }, { - N, N, N, N, N, N, N, N, + N, N, N, N, N, I(ModRM | Sse, em_lfence), N, N, } }; static const struct gprefix pfx_0f_6f_0f_7f = {