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Peter Anvin" To: Peter Zijlstra CC: "Li, Xin3" , "andrew.cooper3@citrix.com" , "linux-kernel@vger.kernel.org" , "x86@kernel.org" , "kvm@vger.kernel.org" , "tglx@linutronix.de" , "mingo@redhat.com" , "bp@alien8.de" , "dave.hansen@linux.intel.com" , "Christopherson,, Sean" , "pbonzini@redhat.com" , "Shankar, Ravi V" Subject: Re: [RFC PATCH 22/32] x86/fred: FRED initialization code User-Agent: K-9 Mail for Android In-Reply-To: References: <20221220063658.19271-1-xin3.li@intel.com> <20221220063658.19271-23-xin3.li@intel.com> <16972e64-7d7b-ad8c-f8dc-6dcab69e629e@citrix.com> <0D72CCA1-A0B6-487B-A6B9-7341020D28A2@zytor.com> Message-ID: <77C92705-B15D-4680-8587-CAEB48BEDDA1@zytor.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Spam-Status: No, score=-1.3 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RDNS_NONE,SPF_HELO_PASS, SPF_PASS autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On December 22, 2022 5:09:28 AM PST, Peter Zijlstra wrote: >On Tue, Dec 20, 2022 at 09:44:33PM -0800, H=2E Peter Anvin wrote: > >> Right, this is one major reason for putting #DB/NMI in a separate stack= level=2E > >But with the IST they each have their own stack, with FRED they'll share >this small stack=2E So make the stack larger if you think we need it=2E You still end up using= less total stack space with FRED=2E