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Wed, 21 Jun 2023 15:59:46 +0000 (UTC) Date: Wed, 21 Jun 2023 17:59:38 +0200 From: Borislav Petkov To: Dave Hansen , Michael Roth Cc: 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: <20230621155912.GKZJMeUHzKCFchhE5v@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> <20230621091541.GEZJK/veTnfhOnX8ci@fat_crate.local> <23f400bc-9a62-be4a-6a24-0e2149d4491c@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <23f400bc-9a62-be4a-6a24-0e2149d4491c@intel.com> X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: E5C22A008C X-Stat-Signature: i3jm17czsuoph73qabzs7im4ibbu6jbj X-Rspam-User: X-HE-Tag: 1687363234-273053 X-HE-Meta: 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 rR/peF49 Rvx3YXiKZP255D4luTnxqT4cS4/kxj7EzsuDqzFk0oR1YlTmiezuT7TauR+K2qfbIlQ32HEJgsaKVX/nhn77PCOOjDtS9Ujpr31pPKuKpht8XN0mdqXVrAE7LWG6FL9VLpgYOFmjsraDk7ELjumKj2X8l9AOrH4a3K0WMOT3gGwRjYYMOOEDBI1aipke3jdTp/k0SvNc8KPvvhcBVeJL42J1GJw42oS8E2jb2S4JXU+H9fA4QkzDjnbqhpA== 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 Wed, Jun 21, 2023 at 07:31:34AM -0700, Dave Hansen wrote: > Yep, there's the hardware side and then there are fun nuggets like using > mem= and then doing a software-only hot-add later after boot. Ah, right, Mike, I think we need to check whether mem= has any effect on SNP. > Also, if the hardware doesn't support any kind of hotplug, it would be > great to point to the place in the spec where it says that. I honestly don't know. But I can't recall ever hearing about hardware memory hotplug so something worth to check too. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette