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[91.199.104.161]) by mx.google.com with ESMTPS id t123si4182915wmt.175.2019.08.09.09.01.42 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 09 Aug 2019 09:01:42 -0700 (PDT) Received-SPF: pass (google.com: domain of alazar@bitdefender.com designates 91.199.104.161 as permitted sender) client-ip=91.199.104.161; Authentication-Results: mx.google.com; spf=pass (google.com: domain of alazar@bitdefender.com designates 91.199.104.161 as permitted sender) smtp.mailfrom=alazar@bitdefender.com 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=20Laz=C4=83r?= To: kvm@vger.kernel.org Cc: linux-mm@kvack.org, virtualization@lists.linux-foundation.org, Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Konrad Rzeszutek Wilk , Tamas K Lengyel , Mathieu Tarral , =?UTF-8?q?Samuel=20Laur=C3=A9n?= , Patrick Colp , Jan Kiszka , Stefan Hajnoczi , Weijiang Yang , Zhang@kvack.org, Yu C , =?UTF-8?q?Mihai=20Don=C8=9Bu?= , =?UTF-8?q?Adalbert=20Laz=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 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 = {