From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-yb1-f202.google.com (mail-yb1-f202.google.com [209.85.219.202]) (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 4EA4714B064 for ; Thu, 13 Jun 2024 18:31:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718303510; cv=none; b=gxSG3EIyZZnZujld6DgSjoEt5x6a/hklC1tIq5kkRfErfDGCbu3+4kLhrDCk+vfirWHPb3TtLiE01Jf3e9itxw0uuu0nfjsv4qVmghIg1xOdk5UUktGy/hY5rFM9X6mAI3OORMYfb2EAg1Kirmzi9mHK57+68lZuW/410eUPVD4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718303510; c=relaxed/simple; bh=FAMe6ZfN8ocTQz72VF1wxp4zgj8DpMNIJ5NFawO1sOI=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=brn5rqL58A2lOgy40C+jnUqydHRGXdINcpGPc1zU4+LeKb0uwnCJqoFdAt7lxuPv9aau/Zm5vfwDZWsnUNaOLMHVATn+lMUi5QblCajry1kmw8OgOMxzCkC3jPuMAUlSkEGmXEKV0Mf7csCEf9uEaZrtzUG9+YGDEl29Ucvu0vc= 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=t2US+rGJ; arc=none smtp.client-ip=209.85.219.202 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="t2US+rGJ" Received: by mail-yb1-f202.google.com with SMTP id 3f1490d57ef6-dfede368fcaso2332005276.3 for ; Thu, 13 Jun 2024 11:31:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1718303508; x=1718908308; 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=FAMe6ZfN8ocTQz72VF1wxp4zgj8DpMNIJ5NFawO1sOI=; b=t2US+rGJT+tw1WrqvQIBP3/7VKiEg6tkZyQEdACI1XLRpZJ7vM1pp0MVy1geqUYTDG ahLUJIggTcbLDrXBns+jVg83aog7ieHnqoe8PBTb3XdEhGMKK6PnCs6N/e3m4cX2EoCR XGkJ9hekRet6LaNoGChWGsBmhHVFcAWBRMHoeTFhWdroW502g3kH4EJJrS4HrmzIJNiZ VOqj/bboWESATyHP/eNoLfvioKkAbr10vjErh9yBybIMcTVGBXuml3ldCKIrZ6tYWWZB agc8AxR+aUsEBPacMIN32OkblTs8oQcvMkoeqkteksCAMAlPZhB6rFJY3Tjmt4pYOaKb OkrA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1718303508; x=1718908308; 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=FAMe6ZfN8ocTQz72VF1wxp4zgj8DpMNIJ5NFawO1sOI=; b=FPpNdBVuyEo9SL1PVrxNT2Inm3gEQYCgCBPL8R+1cwqFYsGVIwjcmXlgakeb7BrJcG Rs2tlDe+Cp0/uvbAjr5jAf9KX92zpm8GI0eB9MIyqIzWrTZTiL6yiGX7Tv2kD2IK1+Fo Yr/X7/R58kVP7/tByh7k/Wa0tPWkFQtep1TOEte8WaF1PeBXKxYdJuSBaGkis04YbN9h OWWeqpSekIfs98xKuriduyYCKDnKUSUQOw8rfMGJVde9bReYZoOaLeFs0958w60L4uCG rvxOr3teb+nOX9MQuT/ZGbS4hua5JOkbfgKpvpvELFpUetT5YK/tZr42RRz4PB092yyE MzqQ== X-Forwarded-Encrypted: i=1; AJvYcCXHAfs2eD5Up2Awzi8aAOxTWvnFVcp2W4SwxRcbTQKTZi6z/UQkEupRdewii0c9Rbgbwqzqs9raVrnX8PnDrZitl0WK X-Gm-Message-State: AOJu0YwZy+4lSrLUp+4huT+SMMJ3+oW0dPcx4E3tuLlP5yhDXMP+R89+ 4RnKjOsASbu0uMrT0dcQT6YpcpOThYkzTk4U5Izoj3kO0ZojF+Vg+l/tQ9I/a+rj6d2mT85MEHX TEg== X-Google-Smtp-Source: AGHT+IHJdhDYs97torwnnhU6KnlaCZsdrWccR1M8UsNd8oy3s5V+SSgGLN9j20SAhn7b35SEH2kqBCITkow= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a25:8445:0:b0:df7:9ac4:f1b2 with SMTP id 3f1490d57ef6-dff153d7f58mr42781276.5.1718303508321; Thu, 13 Jun 2024 11:31:48 -0700 (PDT) Date: Thu, 13 Jun 2024 11:31:46 -0700 In-Reply-To: <20240207172646.3981-23-xin3.li@intel.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240207172646.3981-1-xin3.li@intel.com> <20240207172646.3981-23-xin3.li@intel.com> Message-ID: Subject: Re: [PATCH v2 22/25] KVM: x86: Allow FRED/LKGS/WRMSRNS to be exposed to guests From: Sean Christopherson To: Xin Li Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, pbonzini@redhat.com, corbet@lwn.net, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, shuah@kernel.org, vkuznets@redhat.com, peterz@infradead.org, ravi.v.shankar@intel.com, xin@zytor.com Content-Type: text/plain; charset="us-ascii" On Wed, Feb 07, 2024, Xin Li wrote: > Allow FRED/LKGS/WRMSRNS to be exposed to guests, thus a guest OS could see > these features when the guest is configured with FRED/LKGS/WRMSRNS in Qemu. (a) please describe what these features are, and (b) one patch per feature unless they _must_ be bundled together, in which case there needs to be code to enforce that. > A qemu patch is required to expose FRED/LKGS/WRMSRNS to KVM guests. Omit this, QEMU is not the only VMM that uses KVM.