From mboxrd@z Thu Jan 1 00:00:00 1970 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 B7B76C433EF for ; Wed, 27 Oct 2021 14:48:17 +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 8601C60EDF for ; Wed, 27 Oct 2021 14:48:17 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 8601C60EDF Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.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:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Date:Cc:To:From:Subject:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=gBGUPHs6n+xghvhSsMk6FEYdiWks14htMxNhnAqtRn8=; b=BoiuMw1U4FKi98 S0w++590rjWV0GRz2kln6uZoHq4uYjMUG5Qut65sGmznrK8zJvKq0dF6FuDJ1gJC91+9VTcGD4lcC NTQ2XYoqO2G3wI5UtF8pzxQp/EaXCGwX7LypCPaNFUeLsW35IPUJWeDEzkhutRcM3UPJhrpnzWgCC qvJ2rP5wrutmSC87gchhS5ers7iBL0S4weCw8oJjwBYDkOI0951Xyelg5BkdbozFc+ntDu9UQnSq1 3UP9hrXQIfhTEwvlJJFrvGceqav5twmhDpNtSE3PvMadvVU5cdXdKKw78NRmVgEj7FQulcv2ZD4U6 Kw0ktUJt2+vR/Pf7BGdw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mfkCf-005Aza-3I; Wed, 27 Oct 2021 14:46:57 +0000 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mfkCb-005Axz-50 for linux-arm-kernel@lists.infradead.org; Wed, 27 Oct 2021 14:46:54 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1635346011; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=2qYSlrAKosDph82rxsiEzXsE5XvhQyE8fCwSEfLlqVs=; b=XPyC0RD8ReIUO5JxKrcheBOW3QfrdgEV9r/5HmrjTDegAytpzqpJdK8DOeTFgBJnDXFDxu Rr4Gvc24VN11FmZF852n4I6iNPUWNBWpcO5gNOFTaBFAgL3aZkjoNdPiDGtYfgtCD/ZlZk 3YsCF7ok5oXBNF7MV6Osl9e4NuIoTWE= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-207-3bmBenbzNJ6u5q4NMmEIWA-1; Wed, 27 Oct 2021 10:46:50 -0400 X-MC-Unique: 3bmBenbzNJ6u5q4NMmEIWA-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 6798A9F92C; Wed, 27 Oct 2021 14:46:46 +0000 (UTC) Received: from starship (unknown [10.40.194.243]) by smtp.corp.redhat.com (Postfix) with ESMTP id 52BDC60843; Wed, 27 Oct 2021 14:46:35 +0000 (UTC) Message-ID: Subject: Re: [PATCH v2 17/43] KVM: x86: Directly block (instead of "halting") UNINITIALIZED vCPUs From: Maxim Levitsky To: Sean Christopherson , 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 , 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 Date: Wed, 27 Oct 2021 17:46:34 +0300 In-Reply-To: <20211009021236.4122790-18-seanjc@google.com> References: <20211009021236.4122790-1-seanjc@google.com> <20211009021236.4122790-18-seanjc@google.com> User-Agent: Evolution 3.36.5 (3.36.5-2.fc32) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211027_074653_295499_AFD53EF5 X-CRM114-Status: GOOD ( 18.31 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, 2021-10-08 at 19:12 -0700, Sean Christopherson wrote: > 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 > --- > 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; Makes sense. Reviewed-by: Maxim Levitsky Best regards, Maxim levitsky _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel