From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f181.google.com (mail-pl1-f181.google.com [209.85.214.181]) (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 2C8B42C83 for ; Wed, 13 Oct 2021 21:20:15 +0000 (UTC) Received: by mail-pl1-f181.google.com with SMTP id g5so2708084plg.1 for ; Wed, 13 Oct 2021 14:20:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=RGN5XybAu/ZhV4g4WKdQdjzcI3C7PMTK/Om4cnVrUpo=; b=URyt4OiWOZC9rK5oCCWsfUHOqUulNfj8PNGEdBZtuq6KCLHghJJH1K2XFPqHe+8A7y 56MHd6S8jFcLp7x91lXskW43i/kaf10KdqkU+LjqEdBmY1cKnBADOUyg4E/e4bVlRSQp sXUn2UHFAJtGCxOdV+33RGRos4gvcpAsM+/EJTmf+5mshqUfa6AWpZCOYewLATdcJgXI TxHeqzIogq3Ec9tg0+7AUlZcDaZe7URCgnMuLvWHocz/izBx/kV3wTyYKYYLhxcPOZto 2M98Jb9p2C4x5nYV+q1yvkyuEtlMcPzrwMzIvIq0Trd1MB/16Mx/Re0M5DPMChi+vAnM rtUw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=RGN5XybAu/ZhV4g4WKdQdjzcI3C7PMTK/Om4cnVrUpo=; b=3vHhe8UWmI7h4vxKzlNvV11GFE4A6VFRSZcO7tEVWnh2Qi4Rj6ndk4uG1SyAtBE25k jZjMCJiCSF0j+MkZU3c2v82MfSuTyS4FW2B3chyiGaZsWcxSScR82RWfsv97RptXY7aR sNk9R+hs/XQZ/gCxuyN1RV0ZbDqR8B8fvUFpFoGUY1YG6QSgwYGs7I659JPWWbA5ai4n w0bgFl6ndbgJLP2s5SHfycGAtXM/CZJNl5O5ksJ8lsOXOOlY4t9g7bPhCctlcQZRMeMe ic8IHSuWJUSWw3tSkPibw2T3o4ZDZrdZKduo0/pTeoW3e4EWBY9ynLwP7Wxi5hi52uVW //ew== X-Gm-Message-State: AOAM530Kj4lPa8hIt3VGF4/ltRIhY0Sy3PMaO0SFQ10wpDNqDLhjBimL CkA1Ef/18svXJYjW/nl1d6ONvg== X-Google-Smtp-Source: ABdhPJychxbBPRopo44Q5l2xzCuClhpOoVGj+sul7kS1bgtgKxWbFsqery8BnwMw41xY+QTD3uOz7w== X-Received: by 2002:a17:90b:30d6:: with SMTP id hi22mr16321219pjb.4.1634160014413; Wed, 13 Oct 2021 14:20:14 -0700 (PDT) Received: from google.com (157.214.185.35.bc.googleusercontent.com. [35.185.214.157]) by smtp.gmail.com with ESMTPSA id u12sm414951pgi.21.2021.10.13.14.20.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 Oct 2021 14:20:13 -0700 (PDT) Date: Wed, 13 Oct 2021 21:20:10 +0000 From: Sean Christopherson To: Brijesh Singh Cc: x86@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-coco@lists.linux.dev, linux-mm@kvack.org, linux-crypto@vger.kernel.org, Thomas Gleixner , Ingo Molnar , Joerg Roedel , Tom Lendacky , "H. Peter Anvin" , Ard Biesheuvel , Paolo Bonzini , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Andy Lutomirski , Dave Hansen , Sergio Lopez , Peter Gonda , Peter Zijlstra , Srinivas Pandruvada , David Rientjes , Dov Murik , Tobin Feldman-Fitzthum , Borislav Petkov , Michael Roth , Vlastimil Babka , "Kirill A . Shutemov" , Andi Kleen , tony.luck@intel.com, marcorr@google.com, sathyanarayanan.kuppuswamy@linux.intel.com Subject: Re: [PATCH Part2 v5 34/45] KVM: SVM: Do not use long-lived GHCB map while setting scratch area Message-ID: References: <20210820155918.7518-1-brijesh.singh@amd.com> <20210820155918.7518-35-brijesh.singh@amd.com> Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210820155918.7518-35-brijesh.singh@amd.com> On Fri, Aug 20, 2021, Brijesh Singh wrote: > The setup_vmgexit_scratch() function may rely on a long-lived GHCB > mapping if the GHCB shared buffer area was used for the scratch area. > In preparation for eliminating the long-lived GHCB mapping, always > allocate a buffer for the scratch area so it can be accessed without > the GHCB mapping. Would it make sense to post this patch and the next (Remove the long-lived GHCB host map) in a separate mini-series? It's needed for SNP, but AFAICT there's nothing that depends on SNP. Getting this merged ahead of time would reduce the size of the SNP series by a smidge.