From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f201.google.com (mail-pf1-f201.google.com [209.85.210.201]) (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 C15BE174EFA for ; Thu, 2 May 2024 18:34:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714674894; cv=none; b=YEWcXWdbSNuJincUxEFkcoScmNYqHcR6aQO6zkZsYcQOiUkexSiYHruUdWgSude4l91kAXHO6QpP4jJ2KKdk5+xFgoSZv5chbBlJMIj1wjCN3R7UioR3hKBkw1CeAHOk1KqD/2yTh5aR4RnkZ8GFZQCPcgfQp7V7gZRHtRNrt4s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714674894; c=relaxed/simple; bh=jytgknmHYWTrXv1GAauTxUQg2j1Ex2jV+8u8ch/uEp4=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=II0UXXT9n6mNn0CN7G4rSEdCI8YCq8c43oPW0cxfPotxaMIpOPzyOapk0z11piZK7LgWNG7liqz89FQD4HcX5uEUw3j6U0NuQno83X4A1Sc19Ia6z65TRM172+phE56cIUvioCcD4tCUPFGEPB47c6DYF/iSa3i5ayhBnjOKiU4= 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=L/KBlq/q; arc=none smtp.client-ip=209.85.210.201 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="L/KBlq/q" Received: by mail-pf1-f201.google.com with SMTP id d2e1a72fcca58-6f3844500a5so8098837b3a.3 for ; Thu, 02 May 2024 11:34:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1714674892; x=1715279692; 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=jytgknmHYWTrXv1GAauTxUQg2j1Ex2jV+8u8ch/uEp4=; b=L/KBlq/qMeOxxcs6qukbEQgikZ2Wg6YAfdIwExebOHi8w4tdERla2XU+0nLJQa3FVa DMjtQRPHCH1RJBX+SIf+j70Fu2rzx1xeh6DMFGpbqjjmJu0SXf6mOnfriGje7YtirNLf Q6+4in3rss3/6YmzYKVb+xqB2La4Ba6u+6x7Zew8Hbto5wixo3/0NENjWS3pkSLPDfu6 FUZxiWsh8Rtd+UrZCbY5O9ymfYAfJKnq57GvJYxWT3cP04HQ1JzZfA7KU/A7KzhipQ5M IDNr/yw1ge31SuvJ05DE2dZDAaSRq1mwikcgQ9yl7zbPsgNZ58jSTLBY1mZ7s43n+htJ 3llg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1714674892; x=1715279692; 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=jytgknmHYWTrXv1GAauTxUQg2j1Ex2jV+8u8ch/uEp4=; b=rvTUqFOKLlZpWQvBcnZ3D3jWSqC/oHK7RNxA5g7cWE8BmMXG4sr+tFFtHr6UaayPxp MTOgsF9hJXHzSYxshcNxrB7V786XAffBD8Hnaj9ymaeDoRx/GOrQfTyeiIJHtO8+PklL ZjYiCd6GS7bcuu6oyyrGTsIBm1etwdjn/UVxb2K4ERlCEEX+9LiO6HvNmFp8xA4Eh9Nz gTN2zWqRW7HwpwKS9fSwyDhERZ3RWlwnlP+SCoRAOwrb+bEB/Lt5Sa1EeIEfQTry8v4T revo64BT/qKjN4bmzPWPMsq6Z65ZKZWnbE61b9DDVglgAq7zA3ejieMZzWmF/Kj23mSA +Yfg== X-Forwarded-Encrypted: i=1; AJvYcCV9OUqXx7RY2+rIGMTxAd01TKCtOPUq2jBX2Ydlg/NoSlNhS0KppKC1Lh8kN9YWAK/BvEzy9B+L90zkrQa0EoIlaMmxhUNon37LXjl6 X-Gm-Message-State: AOJu0YxIOOCbHjb94ZioQa7G728uWzD2s1EArlA1guqGUauDaZd9Cu78 Zx/3K5KOI7hudzGe0m+2nCIBh6IPbIaXWyU+vMZRTR1/z5fumHEZgyktLoyPOm3n9hjLKUBxphl zrQ== X-Google-Smtp-Source: AGHT+IHWL5Bv8mTDqw5PQCUQ3Ma17xnc0OOcCgLDrt0pU0GynYuPCW7ysv0HOkzIsyoIRHjZ3DtUj8iHTnI= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a05:6a00:3982:b0:6e5:b5e8:e076 with SMTP id fi2-20020a056a00398200b006e5b5e8e076mr11141pfb.3.1714674892052; Thu, 02 May 2024 11:34:52 -0700 (PDT) Date: Thu, 2 May 2024 11:34:50 -0700 In-Reply-To: <9b05e2d7-ac1c-e60f-0f6e-f4befea06334@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240226213244.18441-1-john.allen@amd.com> <20240226213244.18441-7-john.allen@amd.com> <9b05e2d7-ac1c-e60f-0f6e-f4befea06334@amd.com> Message-ID: Subject: Re: [PATCH v2 6/9] KVM: SVM: Add MSR_IA32_XSS to the GHCB for hypervisor kernel From: Sean Christopherson To: Tom Lendacky Cc: John Allen , kvm@vger.kernel.org, weijiang.yang@intel.com, rick.p.edgecombe@intel.com, bp@alien8.de, pbonzini@redhat.com, mlevitsk@redhat.com, linux-kernel@vger.kernel.org, x86@kernel.org Content-Type: text/plain; charset="us-ascii" On Thu, May 02, 2024, Tom Lendacky wrote: > The hypervisor side could be optimized to compare the value and only update > the CPUID runtime if those values are different. Heh, this is exactly the thought I had around dinner time yesterday :-)