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Wed, 21 Jun 2023 09:15:46 +0000 (UTC) Date: Wed, 21 Jun 2023 11:15:41 +0200 From: Borislav Petkov To: Dave Hansen Cc: Michael Roth , kvm@vger.kernel.org, linux-coco@lists.linux.dev, linux-mm@kvack.org, linux-crypto@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com, jroedel@suse.de, thomas.lendacky@amd.com, hpa@zytor.com, ardb@kernel.org, pbonzini@redhat.com, seanjc@google.com, vkuznets@redhat.com, jmattson@google.com, luto@kernel.org, dave.hansen@linux.intel.com, slp@redhat.com, pgonda@google.com, peterz@infradead.org, srinivas.pandruvada@linux.intel.com, rientjes@google.com, dovmurik@linux.ibm.com, tobin@ibm.com, vbabka@suse.cz, kirill@shutemov.name, ak@linux.intel.com, tony.luck@intel.com, marcorr@google.com, sathyanarayanan.kuppuswamy@linux.intel.com, alpergun@google.com, dgilbert@redhat.com, jarkko@kernel.org, ashish.kalra@amd.com, nikunj.dadhania@amd.com, liam.merwick@oracle.com, zhi.a.wang@intel.com, Brijesh Singh Subject: Re: [PATCH RFC v9 07/51] x86/sev: Add the host SEV-SNP initialization support Message-ID: <20230621091541.GEZJK/veTnfhOnX8ci@fat_crate.local> References: <20230612042559.375660-1-michael.roth@amd.com> <20230612042559.375660-8-michael.roth@amd.com> <12f95b38-427c-6810-373a-ba2062c43882@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <12f95b38-427c-6810-373a-ba2062c43882@intel.com> X-Rspamd-Queue-Id: 0D749120002 X-Rspam-User: X-Stat-Signature: 8pfxf94nxmq46us5daemu3j1x1w9gsp5 X-Rspamd-Server: rspam03 X-HE-Tag: 1687338991-26549 X-HE-Meta: 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 h7duoeiH ATYgZJKdpmSMBuJFbT81QLmDL36SfoxyPqn/7XPcpTXkE7T2JRIGMyi/mKbAk074anjR5h05eHrkDPG7jybHG72m9bGwSBa327NuyNf5TBcW/M3KkuNdPrtRVf/aO6CAYDQS/oiJgbOssxf55gEGMYPXBqCFbmSODd0VU9YE3AJKu8pZ4l8D6HE9C9ijLYfYNYan6N8V3SMFXiygxpp5YanIJH5DvXI3ul/6up/2VftEYoPSD76iWdCvoBA== 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 Mon, Jun 12, 2023 at 08:34:02AM -0700, Dave Hansen wrote: > On 6/11/23 21:25, Michael Roth wrote: > > + /* > > + * Calculate the amount the memory that must be reserved by the BIOS to > > + * address the whole RAM, including the bookkeeping area. The RMP itself > > + * must also be covered. > > + */ > > + max_rmp_pfn = max_pfn; > > + if (PHYS_PFN(rmp_end) > max_pfn) > > + max_rmp_pfn = PHYS_PFN(rmp_end); > > Could you say a little here about how this deals with memory hotplug? Does SNP hw even support memory hotplug? I think in order to support that, you'd need some special dance because of the RMP table etc... -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette