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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4854b66ffe2sm140743645e9.13.2026.03.12.12.06.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Mar 2026 12:06:01 -0700 (PDT) Date: Thu, 12 Mar 2026 19:06:00 +0000 From: David Laight To: Dave Hansen Cc: "Nikunj A. Dadhania" , Tom Lendacky , Borislav Petkov , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, tglx@kernel.org, mingo@redhat.com, dave.hansen@linux.intel.com, hpa@zytor.com, xin@zytor.com, seanjc@google.com, pbonzini@redhat.com, x86@kernel.org, sohil.mehta@intel.com, jon.grimm@amd.com Subject: Re: [PATCH v2 1/2] x86/cpu: Disable CR pinning during CPU bringup Message-ID: <20260312190600.09e2493a@pumpkin> In-Reply-To: <41851f3e-4372-4bd2-ac48-65aee3dcafe0@intel.com> References: <20260226092349.803491-1-nikunj@amd.com> <20260226092349.803491-2-nikunj@amd.com> <20260309134640.GOaa7PQJli_C9QATGB@fat_crate.local> <20260309161516.GAaa7yFMulhdzNQ-pt@fat_crate.local> <70644e1d-dd0e-4f0f-81c0-fd095e46e50b@intel.com> <7ca205d6-b01b-4ed3-959d-db31a6496d79@amd.com> <505a6bbd-3ecf-4de9-8fb9-0b21c3435a96@intel.com> <9fa61b80-0e16-4a87-a0e7-3c3dfcda8f7e@amd.com> <55a98b6d-e831-47a6-aa5a-8fe357334f67@intel.com> <41851f3e-4372-4bd2-ac48-65aee3dcafe0@intel.com> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On Thu, 12 Mar 2026 08:02:53 -0700 Dave Hansen wrote: > On 3/12/26 07:53, Nikunj A. Dadhania wrote: > >> The simplest fix is to disable FRED on those kernels, fwiw. =20 > > That would work, but disabling FRED means LTS users will not be able to= use=20 > > FRED with confidential computing=E2=80=94that's not really a fix. =20 >=20 > Why not? >=20 > Is there something out there that *NEEDS* FRED to function? I didn't think there was any real hardware that actually supports FRED. By the time that exists there might be a sane fix - or a newer LTS kernel. David