Message ID | 20190809160047.8319-91-alazar@bitdefender.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show
Return-Path: <owner-linux-mm@kvack.org> 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 0A1AA6C5 for <patchwork-linux-mm@patchwork.kernel.org>; Fri, 9 Aug 2019 16:05:58 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id EA29A1FE82 for <patchwork-linux-mm@patchwork.kernel.org>; Fri, 9 Aug 2019 16:05:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DBDD220072; Fri, 9 Aug 2019 16:05:57 +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=-2.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 68DA11FE82 for <patchwork-linux-mm@patchwork.kernel.org>; Fri, 9 Aug 2019 16:05:57 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id D481B6B02B3; Fri, 9 Aug 2019 12:01:46 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id C783C6B02B6; Fri, 9 Aug 2019 12:01:46 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id AF2686B02B3; Fri, 9 Aug 2019 12:01:46 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from mail-wr1-f69.google.com (mail-wr1-f69.google.com [209.85.221.69]) by kanga.kvack.org (Postfix) with ESMTP id 40D456B02B5 for <linux-mm@kvack.org>; Fri, 9 Aug 2019 12:01:46 -0400 (EDT) Received: by mail-wr1-f69.google.com with SMTP id i6so46680375wre.1 for <linux-mm@kvack.org>; Fri, 09 Aug 2019 09:01:46 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-original-authentication-results:x-gm-message-state:from:to:cc :subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=UpTwNjkf87zYKSmkI/YNR0I3zzE4Ff096n9+NM+blYo=; b=PiAjxr0dYbUzWmGl0AUj0KoiY2zCDQJ1oz65RlCYtIoomS8OwPSQCnTk+2IC9Y1R+g 6TWM/FEItpBwSwMkYbiuFQ6EURrywHeVKtPBbSF6AqcDnz+nI0W6+jk6CKiuOf4k1K4I 6T3l3J0hIhU4l5rIQ+hgTRAM3kgXuA3Td4q2dxhs3G3KjYNloeo9Gw+8BsqxSC3c9m1z tu+IX6kywH9Vo5Hi43YqLVBdvUiRYw+x8HUj2DG7Tu5d70B+Q17sEwc4wpfOTWVktXfU MB0lVGWKQIwj/hSAyo+VztYx7H0m0HLtCtdp4JJ1nwq33t8qD4kSrcHCQ+wEs1Vf1ZWF n/pQ== X-Original-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 X-Gm-Message-State: APjAAAXX97wEs/Swjxd1n/H0GIfLalzer/wYYT2xOOwte9ohsasnE8JU W6pA3hKmxeu4N7IlTjdNSkyCVXzdlCImwzomK83IJKHEFbFh/Rlre99lab5pHoJDX6bsACjvAu0 9ZOMGWvWP7a0QhClImi2UKYYcfI4gzoIzvNJ6Fqhp1vI7sm/ieMqEIr1klWhSNIo64A== X-Received: by 2002:a5d:56c7:: with SMTP id m7mr25093475wrw.64.1565366505858; Fri, 09 Aug 2019 09:01:45 -0700 (PDT) X-Google-Smtp-Source: APXvYqxFR4S56PtbBoiUpH2dKa8xxcTmTAX4sc5sINjLErwjIsnUJGbPXVxA5mcamY5AX5YY3NbZ X-Received: by 2002:a5d:56c7:: with SMTP id m7mr25093368wrw.64.1565366504913; Fri, 09 Aug 2019 09:01:44 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1565366504; cv=none; d=google.com; s=arc-20160816; b=Qi+YyVV4NefZ406beCvjZdttMTXL9qhBWBoBgn/eOz79l+UnKZKh0O4pT0S/6ZannQ AkTQigmhP6crGvT35Gx/ZUyz7lTdrG0w3MKgcwQv5CpesyhwGuJjlRRV5P/Ni+4YUJpY Ld4A4tMwDzwUGQbYq4cupkZ7Us+4jIr5rGmAN9v6eedQX4MyFNqVitvqxIaSyfq3xRDi lqEZsRKqjHlhDPnhZ+jGulv4vZOxVpm70ztirOtpORWyeSStBYBCvlbncXfCTDV6WxL7 UWn1jGcT6MOt3R1Eit8DZUE6CFS1FsOWpUNQyPglwXwQsz3jreizrhQ7PhZgMgn8Qp/o m7Lw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from; bh=UpTwNjkf87zYKSmkI/YNR0I3zzE4Ff096n9+NM+blYo=; b=ShJZfluzuOOdISHhTX1ZFIoSHcQRZF1O8/uh4QiA1ovOh40Mh0ggyW3Jtw2MTOItcg lm9njnlrojMYR/KgR5gj45ZJecctNnMJLKCZuCuq8cF1mgBaGks9ccDVKBNCCmxvJA7U kZxgT76qon5oSP++1lrZlhQLlNzyzECEifanllu0H9FnRtr4rc/c3336JEKecPIcYcWe WCcgdlYROUX/3PmxhFHD0RVXNoiOLlnrcyjYEkKSrwG1BStmW0/2kmVBiUabJ4GdsF/n uM0BxprGNAefSpr8foDwpVIMre3DHMHqcY1RiPhVv109n9vh14h8TIEcA76NHsSEnhiE xWKA== ARC-Authentication-Results: i=1; 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 mx01.bbu.dsd.mx.bitdefender.com (mx01.bbu.dsd.mx.bitdefender.com. [91.199.104.161]) by mx.google.com with ESMTPS id q14si91715809wrf.249.2019.08.09.09.01.44 for <linux-mm@kvack.org> (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 09 Aug 2019 09:01:44 -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 59BC2305D369; Fri, 9 Aug 2019 19:01:44 +0300 (EEST) Received: from localhost.localdomain (unknown [89.136.169.210]) by smtp.bitdefender.com (Postfix) with ESMTPSA id C8C39305B7A1; Fri, 9 Aug 2019 19:01:43 +0300 (EEST) From: =?utf-8?q?Adalbert_Laz=C4=83r?= <alazar@bitdefender.com> To: kvm@vger.kernel.org Cc: linux-mm@kvack.org, virtualization@lists.linux-foundation.org, Paolo Bonzini <pbonzini@redhat.com>, =?utf-8?b?UmFkaW0gS3LEjW3DocWZ?= <rkrcmar@redhat.com>, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>, Tamas K Lengyel <tamas@tklengyel.com>, Mathieu Tarral <mathieu.tarral@protonmail.com>, =?utf-8?q?Samuel_Laur=C3=A9?= =?utf-8?q?n?= <samuel.lauren@iki.fi>, Patrick Colp <patrick.colp@oracle.com>, Jan Kiszka <jan.kiszka@siemens.com>, Stefan Hajnoczi <stefanha@redhat.com>, Weijiang Yang <weijiang.yang@intel.com>, Zhang@kvack.org, Yu C <yu.c.zhang@intel.com>, =?utf-8?q?Mihai_Don=C8=9Bu?= <mdontu@bitdefender.com>, =?utf-8?q?Adalbert_L?= =?utf-8?q?az=C4=83r?= <alazar@bitdefender.com> Subject: [RFC PATCH v6 90/92] kvm: x86: emulate lock cmpxchg8b atomically Date: Fri, 9 Aug 2019 19:00:45 +0300 Message-Id: <20190809160047.8319-91-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: <linux-mm.kvack.org> X-Virus-Scanned: ClamAV using ClamSMTP |
Series |
VM introspection
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expand
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diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index dac4c0ca1ee3..2038e42c1eae 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -2320,7 +2320,47 @@ static int em_call_near_abs(struct x86_emulate_ctxt *ctxt) static int em_cmpxchg8b(struct x86_emulate_ctxt *ctxt) { - u64 old = ctxt->dst.orig_val64; + u64 old; + + if (ctxt->lock_prefix) { + int rc; + ulong linear; + u64 new = (reg_read(ctxt, VCPU_REGS_RBX) & (u32)-1) | + ((reg_read(ctxt, VCPU_REGS_RCX) & (u32)-1) << 32); + + old = (reg_read(ctxt, VCPU_REGS_RAX) & (u32)-1) | + ((reg_read(ctxt, VCPU_REGS_RDX) & (u32)-1) << 32); + + /* disable writeback altogether */ + ctxt->d &= ~SrcWrite; + ctxt->d |= NoWrite; + + rc = linearize(ctxt, ctxt->dst.addr.mem, 8, true, &linear); + if (rc != X86EMUL_CONTINUE) + return rc; + + rc = ctxt->ops->cmpxchg_emulated(ctxt, linear, &old, &new, + ctxt->dst.bytes, + &ctxt->exception); + + switch (rc) { + case X86EMUL_CONTINUE: + ctxt->eflags |= X86_EFLAGS_ZF; + break; + case X86EMUL_CMPXCHG_FAILED: + *reg_write(ctxt, VCPU_REGS_RAX) = old & (u32)-1; + *reg_write(ctxt, VCPU_REGS_RDX) = (old >> 32) & (u32)-1; + + ctxt->eflags &= ~X86_EFLAGS_ZF; + + rc = X86EMUL_CONTINUE; + break; + } + + return rc; + } + + old = ctxt->dst.orig_val64; if (ctxt->dst.bytes == 16) return X86EMUL_UNHANDLEABLE;