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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 15:47:43 +0100 In-Reply-To: References: <20251015082727.2395128-1-kevin.brodsky@arm.com> <20251015082727.2395128-12-kevin.brodsky@arm.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-KCNFYCezFnaGZQ+WN2tw" 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 --=-KCNFYCezFnaGZQ+WN2tw Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable 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 >=20 > Looks ok to me, but I hope we get some confirmation from x86 / xen > folks. 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? 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