From patchwork Sat Oct 9 02:12:10 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Christopherson X-Patchwork-Id: 12547129 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 40E2AC433EF for ; Sat, 9 Oct 2021 02:31:50 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 09C1760F94 for ; Sat, 9 Oct 2021 02:31:50 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 09C1760F94 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:Reply-To:List-Subscribe:List-Help: List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To:From:Subject:References :Mime-Version:Message-Id:In-Reply-To:Date:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=Whr46l/3zQQQoWu/QG+JMgqHX3gM3USIJxLDu0Z//PY=; b=Towo3bF3oLfob3 noN2VNQM0HGNYU1YIqnjKvXAILDyEtUymQxuJ498gKb1W2kFMsv7YI6DoQS/+vA3sgAd1DcNPuDoI 18piZ5oXjdP1oaLpqlPCE1f9ThFt6FsC7V0kCxIOThm03hHgTCaqs/iYj2GNorSLmQHF0rfR6jTRO dZ+enZvnPQZ7fyF5rgGGRN334Bb4nRraoYQZ7wj2VvUeJPSmsyqWpf7NVQP7Fpw541IJ3mdd/m9l3 jvBDeBUoFzjrZkBKOcYLqfd8Mwo7y35GEY/J6n1bjpzTI6/GpEsdhAv3yol+Hqf+/4JCgSowcvQ5p Vpk6mazKQcG8hv1orVIg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mZ273-004bB7-KR; Sat, 09 Oct 2021 02:29:29 +0000 Received: from mail-qv1-xf4a.google.com ([2607:f8b0:4864:20::f4a]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mZ1ra-004U9r-LE for linux-arm-kernel@lists.infradead.org; Sat, 09 Oct 2021 02:13:28 +0000 Received: by mail-qv1-xf4a.google.com with SMTP id kk3-20020a056214508300b00382d8d1bd71so10316920qvb.7 for ; Fri, 08 Oct 2021 19:13:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=reply-to:date:in-reply-to:message-id:mime-version:references :subject:from:to:cc; bh=w/H4oIWp6aPNo76SoohcXjeRifcTKNkaEcXswmTfvS8=; b=Awo1FqukPn/eCDkoZYrOLJ78QMIWErLo3T1JPAM+azHfyRwj0C0I0SMNEn5GIB2txU M8xcuGBE4Pj+vf0eSl8CB+c5E5sQbuIMe89aP9EQE621aganA5V6HDgjMAcaBpBwJFVX C3SGKwbSwf16LR8Vkae/cgYp5NG8CH1ijTNN50Rr4HoNERkD2EJxcY2vp85daVtbnuQv ioYQxPegF+Cfcf+3bUPz5AVa6rlii3Hi3Y38Qqp1tDmmH+PsFzX9zPNBKfVsQyV5sVUN 4rGOba9XFbRiNbe1iaNvpJun8hhwygJEEzJPw9IjWbImWyRqKAUCmWW3EdcHL3Zmyd05 +drw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:reply-to:date:in-reply-to:message-id :mime-version:references:subject:from:to:cc; bh=w/H4oIWp6aPNo76SoohcXjeRifcTKNkaEcXswmTfvS8=; b=1pfQaAhSQY2LglgFdginf6lUY4yRi+DojDkvX8ZsrCl11U4ryMS4QgRQ43dNRaUpUE 2ohlwkuGwRrTo3KsPw6P4RbtV7OYDYHZU5kqjaGtMcTDMh2ZbZCMT9F/6vo+rWQVh6ZE jy8zRvEf/lNx57cSkSHOM/9BQKMfG/+uiScQUbxlD38rPXXwqguzE+qUislWtGl5syiJ sPhMz8bjGbMxYSnOGPOqTxHwhHjZRmKSEbWkkiq4fAXJ3Uf6QTt4y0FN1eBjv4qyJGXl 7CRMzqpOwbRC8qkVizZaWgz4VTFWLRI7HQHiNkZd5fgJ4lzsXIOyBtzbN/yDKDT0sDPI xYQw== X-Gm-Message-State: AOAM533Ed2HVlqPeVE38LR+w2VXl6n7CFeoQL7KEaA+AR9PC90TIvezd riuL4+wtPJElbPcye6ynK1H1ysew0Ac= X-Google-Smtp-Source: ABdhPJxfQ527bwjQfHI3Ui/hfU27INsXtrHgzCKRUD4Jie98v/tpcQf1vSHG80RTY51lGOqh4HTdLuZNSsA= X-Received: from seanjc798194.pdx.corp.google.com ([2620:15c:90:200:e39b:6333:b001:cb]) (user=seanjc job=sendgmr) by 2002:ac8:4b57:: with SMTP id e23mr1849346qts.328.1633745603486; Fri, 08 Oct 2021 19:13:23 -0700 (PDT) Date: Fri, 8 Oct 2021 19:12:10 -0700 In-Reply-To: <20211009021236.4122790-1-seanjc@google.com> Message-Id: <20211009021236.4122790-18-seanjc@google.com> Mime-Version: 1.0 References: <20211009021236.4122790-1-seanjc@google.com> X-Mailer: git-send-email 2.33.0.882.g93a45727a2-goog Subject: [PATCH v2 17/43] KVM: x86: Directly block (instead of "halting") UNINITIALIZED vCPUs From: Sean Christopherson To: Marc Zyngier , Huacai Chen , Aleksandar Markovic , Paul Mackerras , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank , Paolo Bonzini Cc: James Morse , Alexandru Elisei , Suzuki K Poulose , Atish Patra , David Hildenbrand , Cornelia Huck , Claudio Imbrenda , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-mips@vger.kernel.org, kvm@vger.kernel.org, kvm-ppc@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, David Matlack , Oliver Upton , Jing Zhang X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211008_191326_752831_3F4DB2D5 X-CRM114-Status: GOOD ( 12.01 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Sean Christopherson Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Go directly to kvm_vcpu_block() when handling the case where userspace attempts to run an UNINITIALIZED vCPU. The vCPU is not halted, nor is it likely that halt-polling will be successful in this case. Reviewed-by: David Matlack Signed-off-by: Sean Christopherson Reviewed-by: Maxim Levitsky --- arch/x86/kvm/x86.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index e6c17bbed25c..cd51f100e906 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -10133,7 +10133,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu) r = -EINTR; goto out; } - kvm_vcpu_halt(vcpu); + kvm_vcpu_block(vcpu); if (kvm_apic_accept_events(vcpu) < 0) { r = 0; goto out;