From patchwork Thu Jan 19 17:35:54 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Matlack X-Patchwork-Id: 13108429 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 06B3FC678D6 for ; Thu, 19 Jan 2023 17:36:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230166AbjASRgS (ORCPT ); Thu, 19 Jan 2023 12:36:18 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43772 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230154AbjASRgP (ORCPT ); Thu, 19 Jan 2023 12:36:15 -0500 Received: from mail-pg1-x549.google.com (mail-pg1-x549.google.com [IPv6:2607:f8b0:4864:20::549]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0A56C829A3 for ; Thu, 19 Jan 2023 09:36:14 -0800 (PST) Received: by mail-pg1-x549.google.com with SMTP id g31-20020a63111f000000b004bbc748ca63so1318572pgl.3 for ; Thu, 19 Jan 2023 09:36:14 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=GgujeBTGY+XPYs5ne3mTkJokj6lazpp6N+d6XNZ97pw=; b=latOsqax6/PmzNPPdGRPsks2ZPHfSiaoVYaka5jMmqwJQavYtzMyOpZciFUpDiWGD8 TQQSjrxyS3NZ/nnLYwJShowJUhlSp7XkMCflOl4PIo6c8VDpH5Rf6NLe0a3eOnvdnAes Oirg6ipeLtjYdqlnKTLR3rlxyPaT/iVlx8VCkmhit7DE+00R9343AfUr4sdVPT/XxIwO DUx9jDVHdcmWuTQ+62j4EEl64EcGNCMQLDZwgUB3/vFNLSGGOMfCugHrLTC4F4AgnNmX amE92hT+gOABTNn3Fdf3D3upUlbiKTf7EoW1w/A+BbgnYlDm6bWnXyVZ9YYGborZRydD YDjQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=GgujeBTGY+XPYs5ne3mTkJokj6lazpp6N+d6XNZ97pw=; b=lOMsfmEvUDjry/j8n8OAulhIQbaAi7eipvp/4TOdR8Hr4r1/c3bWSQafLVlmiUBBwz 6uL2i6YFIu+gTIMjcMFcTvKBznaHc4Ca4EexpI3RwY8dcalJICSR7XpaHUFqcZTcXOVm nPllDPx/lEnZ4tWX+PBg2+5hG4q/FNcltG9GACkLT1UF7xuIkeDuIuCHg1yKvWGFwVzq isrlTCxoWrs0rHp73zmdtWN2tDrhMs2baBtqG/bVkrJ332nrhY+KRVGmxSCPXqCJ517P b9S7pW3hOxzOw2Zy7Q2efJiOvrEKJlHJxo5+d9uWmTQI1Z+0Gk/eNI/lcCZdnmoZt3gX Bh2Q== X-Gm-Message-State: AFqh2krZC0m6BxPALwV1vGE+KFjXAY8XoUiti/R2q58G0oFAEC/Igi1g yGZqFCvSrEND5LhCiN5Fblq2H4bvWUjScA== X-Google-Smtp-Source: AMrXdXtcil7hw2SSiTYuJm0VVkKpNKzO555qItFAZvlrYLAajHo5qGGmiFYRAQqSVOhsfjkuf63pFdSVnZe90g== X-Received: from dmatlack-n2d-128.c.googlers.com ([fda3:e722:ac3:cc00:20:ed76:c0a8:1309]) (user=dmatlack job=sendgmr) by 2002:aa7:8a45:0:b0:581:6059:b7c8 with SMTP id n5-20020aa78a45000000b005816059b7c8mr1316362pfa.26.1674149773461; Thu, 19 Jan 2023 09:36:13 -0800 (PST) Date: Thu, 19 Jan 2023 09:35:54 -0800 In-Reply-To: <20230119173559.2517103-1-dmatlack@google.com> Mime-Version: 1.0 References: <20230119173559.2517103-1-dmatlack@google.com> X-Mailer: git-send-email 2.39.0.246.g2a6d74b583-goog Message-ID: <20230119173559.2517103-3-dmatlack@google.com> Subject: [PATCH 2/7] KVM: arm64: Use kvm_arch_flush_remote_tlbs() From: David Matlack To: Paolo Bonzini Cc: Marc Zyngier , James Morse , Suzuki K Poulose , Oliver Upton , Zenghui Yu , Huacai Chen , Aleksandar Markovic , Anup Patel , Atish Patra , Paul Walmsley , Palmer Dabbelt , Albert Ou , Sean Christopherson , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, kvmarm@lists.cs.columbia.edu, linux-mips@vger.kernel.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, David Matlack , Raghavendra Rao Ananta Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Use kvm_arch_flush_remote_tlbs() instead of CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL. The two mechanisms solve the same problem, allowing architecture-specific code to provide a non-IPI implementation of remote TLB flushing. Dropping CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL allows KVM to standardize all architectures on kvm_arch_flush_remote_tlbs() instead of maintaining two mechanisms. Opt to standardize on kvm_arch_flush_remote_tlbs() since it avoids duplicating the generic TLB stats across architectures that implement their own remote TLB flush. This adds an extra function call to the ARM64 kvm_flush_remote_tlbs() path, but (I assume) that is a small cost in comparison to flushing remote TLBs. No functional change intended. Signed-off-by: David Matlack --- arch/arm64/include/asm/kvm_host.h | 3 +++ arch/arm64/kvm/Kconfig | 1 - arch/arm64/kvm/mmu.c | 6 +++--- virt/kvm/kvm_main.c | 2 -- 4 files changed, 6 insertions(+), 6 deletions(-) diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 113e20fdbb56..062800f1dc54 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -998,6 +998,9 @@ int __init kvm_set_ipa_limit(void); #define __KVM_HAVE_ARCH_VM_ALLOC struct kvm *kvm_arch_alloc_vm(void); +#define __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS +int kvm_arch_flush_remote_tlbs(struct kvm *kvm); + static inline bool kvm_vm_is_protected(struct kvm *kvm) { return false; diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig index ca6eadeb7d1a..e9ac57098a0b 100644 --- a/arch/arm64/kvm/Kconfig +++ b/arch/arm64/kvm/Kconfig @@ -25,7 +25,6 @@ menuconfig KVM select MMU_NOTIFIER select PREEMPT_NOTIFIERS select HAVE_KVM_CPU_RELAX_INTERCEPT - select HAVE_KVM_ARCH_TLB_FLUSH_ALL select KVM_MMIO select KVM_GENERIC_DIRTYLOG_READ_PROTECT select KVM_XFER_TO_GUEST_WORK diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index 01352f5838a0..8840f65e0e40 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -80,15 +80,15 @@ static bool memslot_is_logging(struct kvm_memory_slot *memslot) } /** - * kvm_flush_remote_tlbs() - flush all VM TLB entries for v7/8 + * kvm_arch_flush_remote_tlbs() - flush all VM TLB entries for v7/8 * @kvm: pointer to kvm structure. * * Interface to HYP function to flush all VM TLB entries */ -void kvm_flush_remote_tlbs(struct kvm *kvm) +int kvm_arch_flush_remote_tlbs(struct kvm *kvm) { - ++kvm->stat.generic.remote_tlb_flush_requests; kvm_call_hyp(__kvm_tlb_flush_vmid, &kvm->arch.mmu); + return 0; } static bool kvm_is_device_pfn(unsigned long pfn) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 277507463678..fefd3e3c8fe1 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -347,7 +347,6 @@ bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req) } EXPORT_SYMBOL_GPL(kvm_make_all_cpus_request); -#ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL void kvm_flush_remote_tlbs(struct kvm *kvm) { ++kvm->stat.generic.remote_tlb_flush_requests; @@ -368,7 +367,6 @@ void kvm_flush_remote_tlbs(struct kvm *kvm) ++kvm->stat.generic.remote_tlb_flush; } EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs); -#endif static void kvm_flush_shadow_all(struct kvm *kvm) {