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([2001:b07:6468:f312:c8dd:75d4:99ab:290a]) by smtp.gmail.com with ESMTPSA id o12sm13359543wms.15.2021.09.20.06.18.31 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 20 Sep 2021 06:18:32 -0700 (PDT) Subject: Re: [PATCH v2 00/13] perf: KVM: Fix, optimize, and clean up callbacks To: Marc Zyngier Cc: Peter Zijlstra , Sean Christopherson , Ingo Molnar , Arnaldo Carvalho de Melo , Will Deacon , Mark Rutland , Catalin Marinas , Guo Ren , Nick Hu , Greentime Hu , Vincent Chen , Paul Walmsley , Palmer Dabbelt , Albert Ou , Thomas Gleixner , Borislav Petkov , x86@kernel.org, Boris Ostrovsky , Juergen Gross , Alexander Shishkin , Jiri Olsa , Namhyung Kim , James Morse , Alexandru Elisei , Suzuki K Poulose , "H. Peter Anvin" , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Stefano Stabellini , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-csky@vger.kernel.org, linux-riscv@lists.infradead.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org, Artem Kashkanov , Like Xu , Zhu Lingshan References: <20210828003558.713983-1-seanjc@google.com> <20210828201336.GD4353@worktop.programming.kicks-ass.net> <662e93f9-e858-689d-d203-742731ecad2c@redhat.com> <87tuifv3mb.wl-maz@kernel.org> From: Paolo Bonzini Message-ID: <7a5825d1-d6e9-8ac8-5df2-cce693525da7@redhat.com> Date: Mon, 20 Sep 2021 15:18:30 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <87tuifv3mb.wl-maz@kernel.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-perf-users@vger.kernel.org On 20/09/21 14:22, Marc Zyngier wrote: >> I think that's only ARM, and even then it is only because of >> limitations of the hardware which mostly apply only if VHE is not in >> use. >> >> If anything, it's ARM that should support module build in VHE mode >> (Linux would still need to know whether it will be running at EL1 or >> EL2, but KVM's functionality is as self-contained as on x86 in the VHE >> case). > I don't see this happening anytime soon. At least not before we > declare the arm64 single kernel image policy to be obsolete. --verbose please. :) I am sure you're right, but I don't understand the link between the two. Paolo