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Date:   Wed, 13 Oct 2021 21:20:10 +0000
From:   Sean Christopherson <seanjc@google.com>
To:     Brijesh Singh <brijesh.singh@amd.com>
Cc:     x86@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
        linux-coco@lists.linux.dev, linux-mm@kvack.org,
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        Tom Lendacky <thomas.lendacky@amd.com>,
        "H. Peter Anvin" <hpa@zytor.com>, Ard Biesheuvel <ardb@kernel.org>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        Wanpeng Li <wanpengli@tencent.com>,
        Jim Mattson <jmattson@google.com>,
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        Dave Hansen <dave.hansen@linux.intel.com>,
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        Borislav Petkov <bp@alien8.de>,
        Michael Roth <michael.roth@amd.com>,
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        Andi Kleen <ak@linux.intel.com>, 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: <YWdNisk78f5BVNv3@google.com>
References: <20210820155918.7518-1-brijesh.singh@amd.com>
 <20210820155918.7518-35-brijesh.singh@amd.com>
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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.