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Mon, 24 Jun 2024 08:32:19 -0700 (PDT) Date: Mon, 24 Jun 2024 08:32:18 -0700 In-Reply-To: <504fa0a7264d4762afda2f13c3525ce5@huawei.com> Mime-Version: 1.0 References: <20230916003118.2540661-1-seanjc@google.com> <504fa0a7264d4762afda2f13c3525ce5@huawei.com> Message-ID: Subject: Re: [PATCH 00/26] KVM: vfio: Hide KVM internals from others From: Sean Christopherson To: Shameerali Kolothum Thodi Cc: Catalin Marinas , Will Deacon , Marc Zyngier , Oliver Upton , Huacai Chen , Michael Ellerman , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "x86@kernel.org" , Peter Zijlstra , Arnaldo Carvalho de Melo , Paolo Bonzini , Tony Krowiak , Halil Pasic , Jason Herne , Harald Freudenberger , Alex Williamson , Andy Lutomirski , "linux-arm-kernel@lists.infradead.org" , "kvmarm@lists.linux.dev" , "linux-mips@vger.kernel.org" , "kvm@vger.kernel.org" , "linuxppc-dev@lists.ozlabs.org" , "kvm-riscv@lists.infradead.org" , "linux-riscv@lists.infradead.org" , "linux-s390@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-perf-users@vger.kernel.org" , Anish Ghulati , Venkatesh Srinivas , Andrew Thornton Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240624_083222_002938_F6EFDAA2 X-CRM114-Status: GOOD ( 20.39 ) 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 Thu, Jun 20, 2024, Shameerali Kolothum Thodi wrote: > > This is a borderline RFC series to hide KVM's internals from the rest o= f > > the kernel, where "internals" means data structures, enums, #defines, > > APIs, etc. that are intended to be KVM-only, but are exposed everywhere > > due to kvm_host.h (and other headers) living in the global include path= s. > > Hi Sean, >=20 > Just thought of checking with you on this series. Do you have plans to re= vive this > series? Yep! > The reason I am asking is, on ARM64/KVM side we do have a requirement > to share the KVM VMID with SMMUV3. Please see the RFC I sent out earlier = this > year[1]. The series basically provides a way for KVM to pin a VMID and al= so > associates an iommufd ctx with a struct kvm * to retrieve that VMID.=20 >=20 > As mentioned above, some of the patches in this series(especially 1-4 & 6= ) that > does the VFIO cleanups and dropping CONFIG_KVM_VFIO looks very straightfo= rward > and useful. I am thinking of including those when I re-spin my RFC series= , if > that=E2=80=99s ok. Please don't include them, as the patch they build towards (patch 5) is bug= gy[*], and I am fairly certain that at least some of the patches will change signi= ficantly. I expect to re-start working on the series in ~2 weeks, and am planning on = actively pushing the series (i.e. not ignoring it for months on end). [*] https://lore.kernel.org/all/ZWp_q1w01NCZi8KX@google.com > Please let me know your thoughts. > > [1]. https://lore.kernel.org/linux-iommu/20240209115824.GA2922446@myrica= =20