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Miller" , "H. Peter Anvin" , Ingo Molnar , Jann Horn , Juergen Gross , "Liam R. Howlett" , Lorenzo Stoakes , Madhavan Srinivasan , Michael Ellerman , Michal Hocko , Mike Rapoport , Nicholas Piggin , Peter Zijlstra , Ryan Roberts , Suren Baghdasaryan , Thomas Gleixner , Vlastimil Babka , Will Deacon , Yeoreum Yun , linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, sparclinux@vger.kernel.org, xen-devel@lists.xenproject.org, x86@kernel.org Date: Fri, 24 Oct 2025 16:17:20 +0100 In-Reply-To: <6ed9f404-9939-4e9f-b5aa-4253bef46df1@arm.com> References: <20251015082727.2395128-1-kevin.brodsky@arm.com> <20251015082727.2395128-12-kevin.brodsky@arm.com> <348e5f1c5a90e4ab0f14b4d997baf7169745bf04.camel@infradead.org> <6ed9f404-9939-4e9f-b5aa-4253bef46df1@arm.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-YI9KzXTKaCZlBvC3KOA8" User-Agent: Evolution 3.52.3-0ubuntu1 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-YI9KzXTKaCZlBvC3KOA8 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2025-10-24 at 17:05 +0200, Kevin Brodsky wrote: > On 24/10/2025 16:47, David Woodhouse wrote: > > On Thu, 2025-10-23 at 22:06 +0200, David Hildenbrand wrote: > > > On 15.10.25 10:27, Kevin Brodsky wrote: > > > > We currently set a TIF flag when scheduling out a task that is in > > > > lazy MMU mode, in order to restore it when the task is scheduled > > > > again. > > > >=20 > > > > The generic lazy_mmu layer now tracks whether a task is in lazy MMU > > > > mode in task_struct::lazy_mmu_state. We can therefore check that > > > > state when switching to the new task, instead of using a separate > > > > TIF flag. > > > >=20 > > > > Signed-off-by: Kevin Brodsky > > > > --- > > >=20 > > > Looks ok to me, but I hope we get some confirmation from x86 / xen > > > folks. > >=20 > > I know tglx has shouted at me in the past for precisely this reminder, > > but you know you can test Xen guests under QEMU/KVM now and don't need > > to actually run Xen? Has this been boot tested? >=20 > I considered boot-testing a Xen guest (considering the Xen-specific > changes in this series), but having no idea how to go about it I quickly > gave up... Happy to follow instructions :) https://qemu-project.gitlab.io/qemu/system/i386/xen.html covers booting Xen HVM guests, and near the bottom PV guests too (for which you do need a copy of Xen to run in QEMU with '--kernel xen', and your distro's build should suffice for that). Let me know if you have any trouble. Here's a sample command line which works here... qemu-system-x86_64 -display none --accel kvm,xen-version=3D0x40011,kernel-i= rqchip=3Dsplit -drive file=3D/var/lib/libvirt/images/fedora28.qcow2,if=3Dxe= n -kernel ~/git/linux-2.6/arch/x86/boot/bzImage -append "root=3D/dev/xvda1 = console=3DttyS0" -serial mon:stdio --=-YI9KzXTKaCZlBvC3KOA8 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCD9Aw ggSOMIIDdqADAgECAhAOmiw0ECVD4cWj5DqVrT9PMA0GCSqGSIb3DQEBCwUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBDQTAeFw0yNDAxMzAwMDAwMDBaFw0zMTEx MDkyMzU5NTlaMEExCzAJBgNVBAYTAkFVMRAwDgYDVQQKEwdWZXJva2V5MSAwHgYDVQQDExdWZXJv a2V5IFNlY3VyZSBFbWFpbCBHMjCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMjvgLKj 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