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31 Jan 2024 08:52:53 -0800 Message-ID: Date: Wed, 31 Jan 2024 08:52:53 -0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC V1 0/5] x86: CVMs: Align memory conversions to 2M granularity Content-Language: en-US To: Vishal Annapurve , x86@kernel.org, linux-kernel@vger.kernel.org Cc: pbonzini@redhat.com, rientjes@google.com, bgardon@google.com, seanjc@google.com, erdemaktas@google.com, ackerleytng@google.com, jxgao@google.com, sagis@google.com, oupton@google.com, peterx@redhat.com, vkuznets@redhat.com, dmatlack@google.com, pgonda@google.com, michael.roth@amd.com, kirill@shutemov.name, thomas.lendacky@amd.com, dave.hansen@linux.intel.com, linux-coco@lists.linux.dev, chao.p.peng@linux.intel.com, isaku.yamahata@gmail.com, andrew.jones@linux.dev, corbet@lwn.net, hch@lst.de, m.szyprowski@samsung.com, bp@suse.de, rostedt@goodmis.org, iommu@lists.linux.dev References: <20240112055251.36101-1-vannapurve@google.com> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit There's a bunch of code in the kernel for TDX and SEV guests. How much of it uses the "CVM" nomenclature? What do you do when you need to dynamically scale up the SWIOTLB size and can't allocate a 2M page? I guess you're saying here that you'd rather run with a too-small 2M pool than a large-enough mixed 4k/2M pool. I also had a really hard time parsing through the problem statement and solution here. I'd really suggest cleaning up the problem statement and more clearly differentiating the host and guest sides in the description.