From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-yw1-f202.google.com (mail-yw1-f202.google.com [209.85.128.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2C2781F946 for ; Fri, 14 Jun 2024 20:36:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718397393; cv=none; b=IBFxB/UT61GvyC283mBodJrem9u4sYZx+4DbxF3IkU4x1wDnGnswQ7i5Hhyr3Gmfl2osto6gIVnwsjvpv9KEv3ZN4KYHmAcPsdPXndLNb7H7aQuc1HpiZlh93AqmBZqYLHH28vCWVXoe5KTMO1DFTIIknus89lAA1LU9OW2sGnU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718397393; c=relaxed/simple; bh=CU7xMDSKoOqQH2eJfiDd+hpi9P1RW19rWaxgyBdPGT4=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=KTj/bsapCMYNdzfO7bb4/Q5xtelcNWf8cY47EmkuSOPOYR3IMERXSMHb7L4OqKUcCbIEwv9K4iW7twQ0z13QJGU3OyE2mOD3aRFc4RkEK4WWxNkcsLaoXqblFc20qW9ggAl6X9Z21jvmbhuzVB3TmsYkh+cvSSL976H9Lq07Djk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=MOJoi9Ws; arc=none smtp.client-ip=209.85.128.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="MOJoi9Ws" Received: by mail-yw1-f202.google.com with SMTP id 00721157ae682-632cdb75d5aso13617767b3.0 for ; Fri, 14 Jun 2024 13:36:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1718397390; x=1719002190; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=EarhHYqHLw4rRLHnmmYNAj6On7awbkYpFByE7/7MBAI=; b=MOJoi9Wsh9xT3Ss4HI27RbNvoOEjHTxc6wQ52wkRlYJ8KjXta/UzqWefBPgKG3xqCR gBS3BOjqmizuSRHEBvbgV37R6MHDFAice4ZFUUEdQ9H2c5gV3VT7IY05ZDNLFwmzJDaN pLmo/Y5nFIouazRqX67IaGIFfQZWKVK5ALz3u5e6ckaMiHL1xHIviIl3DNlDCMD3xd0E w//8vb8KWh4WIa8zOuXQEmJLz5HNynOnrdut3rELeuI3JgW6b5gO0FXdAitKKEWyrzW3 8AvLQ4CQXbjIip6G8ZBq7y4PPdGqUV1KO2ONuiHRPYfYt5gzVZaoi7emtC2K3DWz/nA+ 5vFg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1718397390; x=1719002190; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=EarhHYqHLw4rRLHnmmYNAj6On7awbkYpFByE7/7MBAI=; b=W6Tp1WuvRJawFX2OQDxut74Dw8H0XVzif1ysUJKWDWrnUaBIgiAe7Q8YBO2yR12bDs MJn65AKJ1oDqAl2o6HX2RBXwDRz0Aa8gzYBQU31j5E1WhjPt94ajf2RYeu1FyrFSLuYv Xj9Y/aWKeqkyimGfu2J0HIMdWFR8WxXJEj738HAzkR7tZ3YYOaUOS/rTx9k5xfLDrweA fo+jyAgPrEC5V8H0jie+C1LpJB9rNWaGPQg3XOdRoatYr2lmhEZkvnx/PnJ3dTVrufEH SEIGQAiUaK8NksDuOfuj/ga0ZgT8U81A8688Zsj2m2PA/YzOvtR/70HCvnZc8XWsjsmA /IIQ== X-Forwarded-Encrypted: i=1; AJvYcCV3Zl35liagtNiCh/vVafBj/or5a2V8YiKaMQpEPF05PlYuMP7UX+/d5ubl4TgVhkIddcTfs03O5my60SetI13pU+Di X-Gm-Message-State: AOJu0YyerIAZGNvKRO/g6egwzC4dhcl1+1YNLZ0a+/tQEML+d2p/Wwkb t9g6heMLPPGvXOLpPWU47FEXglzxYuh2LfBU4vu0f6SVYu2pW4Oe58kXnSTvSUKLMBNFgoVCW/T evA== X-Google-Smtp-Source: AGHT+IHUixvgKxJp4GOOWmnZl+Rl3r+JtVPe24pTqqz1meq9WEOuM+QSzAgipem4yK2UHpOAupJPBCPkK5M= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a05:690c:d81:b0:62c:f01d:3470 with SMTP id 00721157ae682-632248103f6mr9051487b3.6.1718397390025; Fri, 14 Jun 2024 13:36:30 -0700 (PDT) Date: Fri, 14 Jun 2024 13:36:28 -0700 In-Reply-To: Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240612215415.3450952-1-minipli@grsecurity.net> <20240612215415.3450952-4-minipli@grsecurity.net> Message-ID: Subject: Re: [PATCH v2 3/4] KVM: Limit check IDs for KVM_SET_BOOT_CPU_ID From: Sean Christopherson To: Mathias Krause Cc: Paolo Bonzini , kvm@vger.kernel.org Content-Type: text/plain; charset="us-ascii" On Fri, Jun 14, 2024, Mathias Krause wrote: > On 14.06.24 18:35, Sean Christopherson wrote: > However, this still doesn't prevent creating VMs that have no BSP as the > actual vCPU ID assignment only happens later, when vCPUs are created. > > But, I guess, that's no real issue. If userland insists on not having a > BSP, so be it. "struct kvm" is zero-allocated, so the BSP will default to vCPU0. I wouldn't be at all surprised if VMMs rely on that (after looking, that does appear to be the case for our VMM).