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[195.38.112.2]) by smtp.gmail.com with ESMTPSA id s18-20020a170906501200b00a474d2d87efsm1646696ejj.139.2024.03.29.01.15.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 29 Mar 2024 01:15:40 -0700 (PDT) Sender: Ingo Molnar Date: Fri, 29 Mar 2024 09:15:38 +0100 From: Ingo Molnar To: Pavin Joseph Cc: Steve Wahl , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , linux-kernel@vger.kernel.org, Linux regressions mailing list , stable@vger.kernel.org, Eric Hagberg , Simon Horman , Eric Biederman , Dave Young , Sarah Brofeldt , Russ Anderson , Dimitri Sivanich , Hou Wenlong , Andrew Morton , Baoquan He , Yuntao Wang , Bjorn Helgaas Subject: Re: [PATCH v4] x86/mm/ident_map: On UV systems, use gbpages only where full GB page should be mapped. Message-ID: References: <20240328160614.1838496-1-steve.wahl@hpe.com> <47302624-6466-41a7-85db-f6872d58a4d2@pavinjoseph.com> Precedence: bulk X-Mailing-List: regressions@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <47302624-6466-41a7-85db-f6872d58a4d2@pavinjoseph.com> * Pavin Joseph wrote: > On 3/29/24 12:45, Ingo Molnar wrote: > > Does the 'nogbpages' kernel command line option fail on these systems > > even outside of kexec (ie. regular boot), or only in combination with > > kexec? > > Original reporter here, using nogbpages allows for normal bootup, but > kexec fails with it on my two similar systems. Just to clarify, we have the following 3 upstream (and soon to be upstream) versions: v1: pre-d794734c9bbf kernels v2: d794734c9bbf x86/mm/ident_map: Use gbpages only where full GB page should be mapped. v3: c567f2948f57 Revert "x86/mm/ident_map: Use gbpages only where full GB page should be mapped." Where v1 and v3 ought to be the same in behavior. So how does the failure matrix look like on your systems? Is my understanding accurate: regular boot | regular kexec | nogbpages boot | nogbpages kexec boot ------------------------|--------------------------------------------------- v1: OK | OK | OK | FAIL v2: OK | FAIL | FAIL | FAIL ? Thanks, Ingo