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Peter Anvin" , Hugh Dickins , Jeff Layton , "J . Bruce Fields" , Andrew Morton , Shuah Khan , Mike Rapoport , Steven Price , "Maciej S . Szmigiero" , Vlastimil Babka , Vishal Annapurve , Yu Zhang , "Kirill A . Shutemov" , luto@kernel.org, jun.nakajima@intel.com, dave.hansen@intel.com, ak@linux.intel.com, david@redhat.com, aarcange@redhat.com, ddutile@redhat.com, dhildenb@redhat.com, Quentin Perret , tabba@google.com, Michael Roth , mhocko@suse.com, wei.w.wang@intel.com Subject: Re: [PATCH v10 3/9] KVM: Extend the memslot to support fd-based private memory Message-ID: References: <20221202061347.1070246-1-chao.p.peng@linux.intel.com> <20221202061347.1070246-4-chao.p.peng@linux.intel.com> <20221220074318.GC1724933@chaop.bj.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20221220074318.GC1724933@chaop.bj.intel.com> X-Stat-Signature: sqkwjj5nfs8ai6knydrqhsio19i9fquw X-Rspam-User: X-Rspamd-Queue-Id: 6DE03A000D X-Rspamd-Server: rspam06 X-HE-Tag: 1671530151-740160 X-HE-Meta: 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 tD1OWy57 bD78FwpaXLJ0adEN0PtJVryPXo8LleZK4AibqwQWDjBKx1e1kQIRBPuRVji7EzPDwnHtZeosQa8zQo9A4MLwBOC8rGQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, Dec 20, 2022 at 03:43:18PM +0800, Chao Peng wrote: > RESTRICTEDMEM is needed by TDX_HOST, not TDX_GUEST. Which basically means that RESTRICTEDMEM should simply depend on KVM. Because you can't know upfront whether KVM will run a TDX guest or a SNP guest and so on. Which then means that RESTRICTEDMEM will practically end up always enabled in KVM HV configs. > The only reason to add another HAVE_KVM_RESTRICTED_MEM is some code only > works for 64bit[*] and CONFIG_RESTRICTEDMEM is not sufficient to enforce > that. This is what I mean with "we have too many Kconfig items". :-\ -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette