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Thu, 17 Aug 2023 09:39:34 +0100 Date: Thu, 17 Aug 2023 09:39:31 +0100 Message-ID: <87a5uqoyf0.wl-maz@kernel.org> From: Marc Zyngier To: Sean Christopherson Cc: Raghavendra Rao Ananta , Oliver Upton , James Morse , Suzuki K Poulose , Paolo Bonzini , Huacai Chen , Zenghui Yu , Anup Patel , Atish Patra , Jing Zhang , Reiji Watanabe , Colton Lewis , David Matlack , Fuad Tabba , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-mips@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Gavin Shan , Shaoqin Huang Subject: Re: [PATCH v9 05/14] KVM: Allow range-based TLB invalidation from common code In-Reply-To: References: <20230811045127.3308641-1-rananta@google.com> <20230811045127.3308641-6-rananta@google.com> 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/28.2 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") X-SA-Exim-Connect-IP: 82.132.234.11 X-SA-Exim-Rcpt-To: seanjc@google.com, rananta@google.com, oliver.upton@linux.dev, james.morse@arm.com, suzuki.poulose@arm.com, pbonzini@redhat.com, chenhuacai@kernel.org, yuzenghui@huawei.com, anup@brainfault.org, atishp@atishpatra.org, jingzhangos@google.com, reijiw@google.com, coltonlewis@google.com, dmatlack@google.com, tabba@google.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-mips@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, gshan@redhat.com, shahuang@redhat.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-20230817_013938_320716_9D0E2D54 X-CRM114-Status: GOOD ( 17.32 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, 15 Aug 2023 23:30:08 +0100, Sean Christopherson wrote: > > On Fri, Aug 11, 2023, Raghavendra Rao Ananta wrote: > > diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c > > index ec169f5c7dce2..00f7bda9202f2 100644 > > --- a/arch/x86/kvm/mmu/mmu.c > > +++ b/arch/x86/kvm/mmu/mmu.c > > @@ -278,16 +278,14 @@ static inline bool kvm_available_flush_remote_tlbs_range(void) > > return kvm_x86_ops.flush_remote_tlbs_range; > > } > > > > -void kvm_flush_remote_tlbs_range(struct kvm *kvm, gfn_t start_gfn, > > - gfn_t nr_pages) > > +int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, gfn_t gfn, u64 nr_pages) > > { > > int ret = -EOPNOTSUPP; > > > > if (kvm_x86_ops.flush_remote_tlbs_range) > > - ret = static_call(kvm_x86_flush_remote_tlbs_range)(kvm, start_gfn, > > - nr_pages); > > - if (ret) > > - kvm_flush_remote_tlbs(kvm); > > + ret = static_call(kvm_x86_flush_remote_tlbs_range)(kvm, gfn, nr_pages); > > + > > + return ret; > > Please write this as > > if (kvm_x86_ops.flush_remote_tlbs_range) > return static_call(kvm_x86_flush_remote_tlbs_range)(kvm, gfn, nr_pages); > > return -EOPNOTSUPP; > > or alternatively > > if (!kvm_x86_ops.flush_remote_tlbs_range) > return -EOPNOTSUPP; > > return static_call(kvm_x86_flush_remote_tlbs_range)(kvm, gfn, nr_pages); > > Hmm, I'll throw my official vote for the second version. I've applied the second version locally. M. -- Without deviation from the norm, progress is not possible. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel