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Sat, 23 Nov 2024 09:49:09 +0000 Date: Sat, 23 Nov 2024 09:49:08 +0000 Message-ID: <871pz2th4b.wl-maz@kernel.org> From: Marc Zyngier To: Ganapatrao Kulkarni Cc: Oliver Upton , kvm@vger.kernel.org, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, Christoffer Dall , Suzuki K Poulose , Alexandru Elisei , James Morse , Joey Gouly , Zenghui Yu Subject: Re: [PATCH v3 00/16] KVM: arm64: nv: Shadow stage-2 page table handling In-Reply-To: <86o727um28.wl-maz@kernel.org> References: <20240614144552.2773592-1-maz@kernel.org> <171878647493.242213.9111337124987897859.b4-ty@linux.dev> <46bea470-3a3b-4dcc-b4a8-a74830c66774@os.amperecomputing.com> <86plmov8n3.wl-maz@kernel.org> <38339ef8-6e69-43b5-8d16-b7fd66775c93@os.amperecomputing.com> <86o727um28.wl-maz@kernel.org> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/29.4 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: gankulkarni@os.amperecomputing.com, oliver.upton@linux.dev, kvm@vger.kernel.org, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, christoffer.dall@arm.com, suzuki.poulose@arm.com, alexandru.elisei@arm.com, james.morse@arm.com, joey.gouly@arm.com, yuzenghui@huawei.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241123_014912_941619_546E6D62 X-CRM114-Status: GOOD ( 30.34 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, 22 Nov 2024 19:04:47 +0000, Marc Zyngier wrote: > > On Fri, 22 Nov 2024 16:54:16 +0000, > Ganapatrao Kulkarni wrote: > > > > > > > > On 21-11-2024 10:14 pm, Marc Zyngier wrote: > > > On Thu, 21 Nov 2024 08:11:00 +0000, > > > Ganapatrao Kulkarni wrote: > > > > > > Hi Ganapatrao, > > > > > >> IIRC, Most of the patches that are specific to NV have been merged > > >> upstream. However I do see that, some of the vGIC and Timer related > > >> patches are still in your private NV repository. Can these patches be > > >> prioritized to upstream, so that we can have have the first working > > >> version of NV on mainline. > > > > > > Who is *we*? > > > > > > Things get upstreamed when we (people doing the actual work) decide > > > they are ready. At the moment, they are not. > > > > > > Also, while I enjoy working on NV, this isn't *my* priority. > > > > Sure, I understand that it's not your priority right now. I'm happy > > to spend some time on it, please do let us know in what areas/patches > > needs attention before the code would be ready to merge? > > Please understand that NV isn't special, and while there is still a > bunch of things that need to be merged, it is the whole of KVM/arm64 > that needs attention. > > For example, there is the debug series from Oliver, the feature > handling from Fuad. They may not have NV written all over them, but > they do have an impact on the NV behaviour one way or another. > > By paying attention to these series, you would help with the > groundwork that is required before we can actually enable NV. This is > what matters now, not the next 50 or so NV-specific patches. And one last thing, while I think of it: NV is very unlikely to get merged without a testing infrastructure. Which means that the current selftests must run at EL2, and that *new* selftests must be created to test the NV implementation (all the trap behaviours, for example). So if you (and I assume your employer, as you keep using the plural) want to help moving NV support upstream, this is an area where you could help and make a massive difference. Thanks, M. -- Without deviation from the norm, progress is not possible.