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Wed, 5 Jun 2024 07:43:05 +0000 (UTC) Date: Wed, 5 Jun 2024 09:42:57 +0200 From: Borislav Petkov To: Dave Young Cc: Mike Rapoport , "Kalra, Ashish" , tglx@linutronix.de, mingo@redhat.com, dave.hansen@linux.intel.com, x86@kernel.org, rafael@kernel.org, hpa@zytor.com, peterz@infradead.org, adrian.hunter@intel.com, sathyanarayanan.kuppuswamy@linux.intel.com, jun.nakajima@intel.com, rick.p.edgecombe@intel.com, thomas.lendacky@amd.com, michael.roth@amd.com, seanjc@google.com, kai.huang@intel.com, bhe@redhat.com, kirill.shutemov@linux.intel.com, bdas@redhat.com, vkuznets@redhat.com, dionnaglaze@google.com, anisinha@redhat.com, jroedel@suse.de, ardb@kernel.org, kexec@lists.infradead.org, linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH v7 1/3] efi/x86: Fix EFI memory map corruption with kexec Message-ID: <20240605074257.GAZmAXAbkc5TGVds5u@fat_crate.local> References: <8e3dfc15-f609-4839-85c7-1cc8cefd7acc@amd.com> <1ef36309-8d7f-447b-a54a-3cdafeccca64@amd.com> <20240603144639.GCZl3XTwmFHwi-KUZW@fat_crate.local> <20240604094358.GBZl7h3otTCYJ5rkkt@fat_crate.local> <20240604180212.GHZl9WpAfNVERTjMqw@fat_crate.local> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: On Wed, Jun 05, 2024 at 10:53:44AM +0800, Dave Young wrote: > It's something good to have but not must for the time being, also no > idea how to save the status across boot, for EFI boot case probably a > EFI var can be used; Yes. > but how can it be cleared in case of physical boot. Otherwise > probably injecting some kernel parameters, anyway this needs more > thinking. Yeah, this'll need proper analysis whether we can even do that reliably. We need to increment it only on the kexec reboot paths and clear it on the normal reboot paths. Thx. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette